ONT - SFO

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ONT — SFO
May 20 — May 271
Round-trip
1 adult
Economy
0 bags
From?
To?
Fri 5/20
Fri 5/27

Good to know

Low season

August

High season

November

Cheapest flight

$27

Average price round-trip

$194

Good deal round-trip

$95

Good deal one-way

$42
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly with an average 33% increase in price.
Flight from Ontario to San Francisco
(avg. price over the last 2 weeks)
or less
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When to book flights from Ontario to San Francisco

Estimated round-trip price
Average price per month
Flight prices as travel date approaches

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $42 or less one-way and $95 or less round-trip.
  • The cheapest flight from Ontario to San Francisco was found 69 days before departure, on average.
  • Book at least 2 weeks before departure in order to get a below-average price.
  • High season is considered to be October, November and December. The cheapest month to fly is August.
  • Morning departure is around 150% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking flights from Ontario to San Francisco

Top airlines flying Ontario to San Francisco

Scores according to KAYAK customer reviews
7.0
United AirlinesOverall score based on 69486 reviews
7.4Boarding
7.0Comfort
7.7Crew
6.6Entertainment
6.5Food
Airline reviews
Pros: "I was asleep."
Cons: "The seats were very cramped."
Read more about United Airlines
Pros: "I was asleep."
Cons: "The seats were very cramped."
Pros: "The entertainment is amazing. Did not expect it. Just download the UA app and it is connected to your device"
Cons: "Not their fault but we were detailed total of 3 hrs from Ontario to SFO and SFO to HNL due to aie traffiv in SFO. They handled it well"
Pros: "Have seatback TV and arrived on-time"
Cons: "Sitting in window seat"
Pros: "Crew & flight attendants very courteous and apologetic; complisnacks while waiting for delayed flight"
Cons: "Flight delay!!"
Cons: "flight was delayed. tug car didn’t work"
Pros: "Very pleasant attentive crew and ground staff. An aborted takeoff on tarmac meant a return to the departure gate and the plane taken to maintenance. The ground staff were superb in dealing with a full plane load of passengers many of whom had onward connections. This meant we had to stay overnight and fly first thing the next morning. Full marks to United for dealing with a potentially dangerous situation and then assisting everyone back in the terminal."
Pros: "Good trip and on time"
Cons: "N/A"
Pros: "The pilots were informative with their announcements and we were informed of turbulence before it started. We also got in ahead of schedule. I also appreciated being able to ask for a glass of water between services as I had fallen asleep."
Cons: "The negative experiences started before we got on the plane. Boarding began slightly behind schedule and was very disorganized. People were all standing in the boarding area and out into the walkway for the concourse. I feel it would be better to have boarding groups come up individually or two at a time. (While group one boards, group two convenes. Once group one has boarded, invite group three to take their place.) Once group three had boarded, an announcement was made that there was no overhead bin space availble for the entirety of group 4. It seems a bit ridiculous that nearly half the plane wouldn’t have overhead space. It took awhile to board group 4 as everyone had luggage to check and once we finally got down the jetway, we had to wait another few minutes before being able to get to our seats as the flight attendant for first class insisted on taking drink orders while she stood in the aisle. I understand this is a perk of first class but I feel it could be better executed. These seats are boarded in group one so to have drink orders incomplete by the time group four is trying to board is irritating at best and incompetent at worst. Once finally at our seats, it became apparent that the announcement about lack of overhead bin space had been made a bit early. The bins were on the full side but they definitely had space available. Also, much of the space had been taken up by jackets and bags that would have fit under the seats; which I felt could have prevented nearly all of the checked bags. The flight was uneventful with minor annoyances like having to pay for entertainment and any sort of food. Even southwest provides entertainment free of charge and I consider them to be more of a budget airline. If I fly Lufthansa again, I will not take a domestic flight through United and will instead book via southwest to and from the international airport Lufthansa flies out of."
Pros: "The service and convenience was excellent. Straight forward and smooth transition throughout boarding and catching connecting flight"
Cons: "The piece of mind given to me by the staff with baggage and connecting to the other flight"
Pros: "overall very pleasant and relaxing food good able to sleep due to luckily extra space! very pleased"
Cons: "Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK."
Pros: "Ontario airport is so easy and convenient"
Pros: "Flight attendants tried but could not change situation"
Cons: "I losr one of two days- moving furniture Have to stay up another night to getready"
Pros: "We had an aisle each! The staff were friendly too."
Cons: "A slight delay"
Pros: "Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour"
Pros: "Crew was helpful and friendly."
Cons: "Flight got delayed and almost missed my connection."
Pros: "The fact that I got fully refunded, even though I still lost out on $500+."
Cons: "My flight was supposed to leave at 12, and all that Kept happening was me receiving text messages about delays pushing my departure time back to 5:35pm. I missed a big birthday event I was throwing for my class that I teach, lost out on money spent for the event and missed out on all the memories made that night. I never got to leave, ended up cancelling my flight. What a waste of time. Seems to always happen when I fly through United."
Pros: "A 3-hour stop over for the connection was not enough!!! The flight to San Francisco was delayed another 90 mins, causing me to miss my 15-hour flight to Singapore, although we arrived 10 minutes before the United Flight! Ten other passengers missed the flight! A travesty! Worse, with "no hotels available", I was rerouted to Chicago for a flight via Tokyo at 1300 the following day! In short, a 30-hour trip became 48 hours of hell and of course an 18-hour delaed arrival in Singapore. But there was more: my luggage was "lost" and thus arrived two days late!!!!! The only saving grace: friendly and helpful UA staff in San Francisco and especially in Chicago. Wow! I deserve some compensaton, wouldn't you all agree?"
Cons: "Please see above!"
Pros: "N/A"
Cons: "Everything was trerrible on this flight! We were delayed from our first connecting flight out to SF to LA and we're put on a different flight connecting to Houston to get us home sooner. We were told by the gentleman at the check in that our correct boarding passes with our seats sitting all together would be given to us at the boarding desk. That was the biggest mistake ever to take this flight because we were then delayed 3 more hrs! Not only that but when I approached the next gentleman at the boarding desk in Houston he was super rude! He was yelling at me when I told them that "they in Dallas,the worker at the check in" told me to get my boarding passes in Houston. He kept yelling saying "there was nothing he could do that he could do that he didn't know who THEY were but that I was talking to him now and that's why he is saying" I tried explaining to him that I just wanted to make sure I got in the right flight home because this is what I was told to do by the employee in Dallas. Not only that but our connecting flight to Houston was horrible! The flight attendant (the male) was very very rude!!! He also was yelling at my niece and nephew when we were trying to put the carry on bags in the compartment. And telling us we could have anything underneath the seat when clearly we could have our personal item underneath. Overall we had the worst experience with United and will never again fly with them! I understand delays may happen but there's no need for the employees to be so rude. so much for their customers service!"
Pros: "i was rebooked and am still on my way"
Cons: "i was delayed in ONT, making my flight an almost 24 hour trip from vONT to my destination. not fun had to reschedule car rental. luckily, they did not charge extra"
Pros: "Nothing"
Cons: "Air Canada flight from Ontario to SFO was operated by United. Our flight was delayed by 2 hours and we ended up missing our connection. The customer service on the phone from both Air Canada and United would not take responsibility and continued to advise to call the other company to reschedule the flight. Not only did we miss our connection but our checked bag was rerouted onto another flight with no formal notification."
Pros: "The flight was delayed but on the ground staff were very helpful in providing announcements. The on board attendants were friendly and competent."
Cons: "This was an aged 737, with narrow, cramped seats and thin, hard plastic armrests. The first class seats were smaller than the Premium Economy ones I flew recently on Norwegian Air. The Economy seats were pure torture -- angled oddly in a way that forced your back to curve, with zero legroom even in the Economy Plus section. I tried putting my purse behind me in an effort to alleviate back pain. It was a miserable trip. In contrast my short flight to Santa Barbara was on a newer plane with wide, comfortable seats. There is no way they should use such an old aircraft on a 4 hour trip."
Pros: "on time"
Pros: "Seats have some good cush to them"
Cons: "I specifically bought carry on luggage that meets the standards so that I would not have to go baggage claim as it would weigh heavily on my schedule. As I stood in line and noticed all of the huge "carry on" bags more than 2 I was astounded when the flight attendant said my carry on would have to be loaded with the other luggage. When I offered my rebuke she scolded me and said the luggage would be there before me....how the hell is that supposed to happen? To make matter worse the flight "attendants" stopped serving half way and when they started again I got trapped by the bathroom and did not get back to my seat in time to enjoy a beverage....not that I was offered one."
Pros: "Nonstop BNA-SFO"
Cons: "United Economy Plus bulkhead was awful. I was seated in seat 7D - there was no bulkhead for me or middle seat - just a curtain. The screens and tiny pockets were only accessible over another passenger. The seat stuck out into the aisle so I was bumped by 200 other passengers at least once - not to mention the flight crew. Finally I had my emotional support dog with me and the crew told me I should. It be in that seat - the seat was assigned by the United Accessibikity Desk as a good one for a service animal - and I had zero choice in the matter. Baggage claim at SFO took over 45 minutes to start -I was home in San Francisco in only 20 minutes after getting my bag."
Pros: "Que acomoden a las parejas juntas."
Cons: "Asiento incomodo"
Pros: "Flash for mac did not install"
Cons: "I felt like I was on my way to my death"
Pros: "I liked nothing about my flights."
Cons: "I hated that my first flight was delayed a whole day and I had to fly out of a different airport to get to eugene. To add coming home I tried to upgrade my flight to Ontario to an earlier time and they refused to do so and said it would cost $75. I felt the least the airline could do was let me fly home an hour earlier since they delayed my flight a whole day but that didn't happen."
Pros: "I liked how quick and easy the flight was; from boarding to exiting the plane in SFO."
Cons: "The size of the plane."
Cons: "The plane smelled like sewage and it was extremely cold inside the plane for the entire duration of the flight."
Cons: "2 hour delay"
Pros: "Nice crew"
Cons: "Long wait for the flight delay, Long wait for take off, long wait pulling into gate. No outlet for rechargING phone, same on flight."
Cons: "Very Rude while talking to me at the airport. Was not happy to assist me and other passengers even though it was the air-line mistake for cancelling the flight and delaying the flight. Will never fly with this airline ever again."
Pros: "What did I like like that the pilot let us know what was going on on every moment and the stewardess was very friendly"
Cons: "Seats very uncomfortable last flight 30 minute flight took an hour if not more and not knowing what gate my next flight is until I get there"
Cons: "The plane landed to San Francisco earlier than scheduled, but we could not get off the plane due to the gate not available. We were stuck on plane for about half an hour and I really worried about making my connection. I hope such arrangements are conducted more smoothly."
Pros: "nothing totally a rip off"
Cons: "I paid 125 for my hockey bag. Flight was delayed but no email or anything. Changing my flight was miserable staff so rude and people on phones can barely speak"
Pros: "Three hours late. No in flight snack since the weather was too bad for the flight attendant to bring a cart down the aisles. Pretty old plane, so kind of uncomfortable. But the staff was really nice and friendly for it being the holiday season, so they get all two stars."
Pros: "Fast service!"
Pros: "Timely...and pilots updates of flight time"
Cons: "3 stewardess slow service"
Pros: "Plane was delayed over 2 & 1/2 hours for no apparent reason"
Pros: "Flight Attendants were nice."
Cons: "The flight was expensive and they wouldn't let us or anyone place carry ons in the over head bin. It was an expensive ticket and didn't include checked bags ($25 more). Carry-ons wound up being "stowed". It would have been nice to know before I bought the tickets that I needed a smaller carry on."
Cons: "It was delayed 3hrs!"
Cons: "I paid good money to be back by 6am however I was delayed and had flights cancelled which made me get home 10 hours later than I should have. This was an overnight flight, so all the places to buy food were closed- United didn't offer snacks or blankets or really anything for the troubles. There were kids also stranded."
Cons: "The cramped conditions. By the way, please add a "N/A" or "not relevant" or "not interested" option to your rating selections. Or allow categories to be left not rated. There was no entertainment on my flight and even if there was I probably wouldn't use it. I don't want to leave a rating at all for that but there's no way not to."
Pros: "It was on time And very convenient"
Pros: "We were not given seats together..."
Cons: "Busy and not well managed and we bought seats well in advance"
Cons: "Received several text messages announcing further delays in flight..."
Cons: "They over booked my flight, so I would have missed it had someone not gave up their seat for me. This was extremely disappointing begin that I had booked months in advance. I even picked my seats!"
Cons: "Ticket agents did not communicate with passengers on why there was a delay and weren't willing to help passengers find alternate routes to their destination."
Pros: "Got me safely to my destination. Other passengers were friendly and helpful. Sf and Vic airports nice. flight attendants passably pleasant. No food that I was aware of. Entertainment at least there was a wifi option since there were no screens."
Cons: "Check in agents all might as well have been robots, but with bad attitude. Even at the star alliance gold checkin desk the agent was clearly unhappy/furious (seem to be ongoing issues with the system/ machine frustrating him) and was consistently abrupt and cold though our interaction. He did help by lifting bags onto weigh and to press buttons to get the tickets issued, but I would have a much better experience of United if he has shown any sign of warmth or even smiled. I was struggling with a baby in a carrier, and several suitcase, and he didn't show any sign of humanity. The guy who labeled our bags was a bit nicer. The team overal though just barked instructions at the customers, never looked them in the eyes, and seemed to all hate their jobs. We got our boarding passes issues successfully, yes, but I felt on pins and needles like I had to be very careful not to offend anyone.... Which I don't think is what you want your passengers to feel at the start of a flight."
Pros: "Because I was unwilling to pay for seat selection, I was prepared to be separated from my husband and stuck in a middle seat. To my pleasant surprise, the agents put us in the same row by ourselves."
Cons: "Better directional signage in both the SFO and Las Vegas airports (arrivals). Las Vegas is a huge airport, requiring a tram to get to the passenger pick-up, even with directions it was confusing and not obvious. In SFO, half the plane walked halfway down the concourse in the wrong direction because of lack of signage and it looks like the right way to go. Drop Kiwi as a third-party for domestic flights, their customer service is clueless, handling charges absurd and flight requirements unnecessary."
Pros: "Seat was very uncomfortable"
Cons: "No entertainment"
Cons: "Website would not let me check in the day before or the morning or my flight. There was an error every time and I almost got to the end once. I could not change the time of my transportation and arrived 10 minutes past the check in deadline (an hour prior to the flight taking off). I was refused access to the flight and offered a flight 5 hours later. The staff was rude and not helpful. I had heard negative things about Frontier and now I know why."
Cons: "that it cost $45 per bag whether you used baggage shipped or carried one. Was then told if did,t pay it at counter, would cost $60 upstairs to carry on. Would only use airline as last resort due to this tactic"
Cons: "The crew personnel were rude enough to ask even a glass of water. The revolving belt at baggage claim area started so late. The ticket should include the laggage charges whether it is 100$ or 150 $. I faced so difficulty in paying the baggage charges because of non availability of credit card. As they don't accept cash. Kindly make it easy for passengers"
Cons: "They didn't know how to handle the unpleasant situation of having delay due to "the plane is having some problems and they will try to fix it asap before departure"."
Pros: "Clean new planes and very friendly crew."
Cons: "It got delayed on my inbound trip for over an hour and a half for no real reasons (all were excuses: weather, crowded landing at SFO, air traffic controller did not give the green light, etc.). On the way back we had to wait over 45 minutes for the plane in our gate to move out of the way so we can get in."
Cons: "The seats are barely glorified lawn chairs, and the crew was extremely insensitive to the fact that the flight took off over 5 hours late and while most people were trying to sleep, they were loud, kept the lights on and were uapologetic that the flight was so ridiculously late. There were children and infants on that flight with exhausted parents who had to take off at 2am instead of 8:50pm. It was awful. Plus you have to pay for a carry on? Ridiculous. I never want to fly Frontier again."
Cons: "Plane was 2 hours late, no advance notice of the delay, and was on the hangar the entire time. No accommodations for delay and."
Pros: "Nice staff, just oblivious to everyone sleeping at 2am while they carried on and on with their chatty gossip."
Cons: "Baggage took almost an hour to arrive on both legs of my trip. We were delayed in SFO but due to a long planned maintenance there. Airline could have prepared better. No early boarding with my two year old, but only after all the elite and a whole zone 1 of people. Seats have big gaps that allow things to fall and people sneezing on you from behind. Loud crew with obnoxious lights on during a very delayed flight that became a red eye. Why pay more for seats near the loud crew who doesn't take in the fact that we're all tired. You want to sell food? Choose better items. My $3.99 coffee could at least have more than a powder non-dairy creamer. Flight price is so deceiving when you charge for everything on top of it, including where I sit. Lame, awful, corporate money grubbing mentality. I'll stick with southwest (I later learned they had had fewer options for once because they actually considered that a runway was closed)."
Cons: "4+ hour delay in Denver caused us to miss the last airport hotel shuttle and made us spend more on food and drinks in Denver. Extra money for a cab in SF. My 6 year old slept on the filthy airport carpet at the gate because at the seats had arm rests. Not even an apology from the airline."
Pros: "Staff on return journey were nice, good pilot too"
Cons: "Lots of delays, no real food available for purchase, husband thought seats were uncomfortable"
Cons: "First I bought a ticket from Spirit Airlines SFO to MCO for 309$, then I saw charges from frontier Airline, frontier airlines bought a ticket for me too for 287$, when I was just watching checking the price. Then I compared the tickets, both the time, but from Frontier Airlines was cheaper then I stayed with frontier and cancel the other reservation from Spirit Airlines the next day I see frontier airlines also cancelled that reservation and I had to rebook another ticket for 496$, the price went up, then I had to pay 187$ extra, IT WAS A FRAUD JOB FROM FRONTIER AIRLINES, I can prove everything above with the receipts and the dates on it, the worse experience I had"
Cons: "Seriously, extra charge for a seat and carryon? Crappy plane, etc."
Cons: "WTF-need to warn customers about carry on baggage charge, plastic seats that do not recline and exorbitant food and beverage charges. Comment at gate by Frontier on $90 carry-on charge was "that's how we charge so little for tickets." Maybe so, but WTF? (Why the face?")"
Cons: "Old/loud plane, uncomfortable non-reclinable seats, fees for everything = not worth it for a cross country flight. If your flight gets delayed due to weather issues you'll be wishing you had those standard amenities most other airlines provide."
Cons: "Flight was cancelled 5 hours before I was supposed to get to the airport. They could not get me on another flight. I had to spend an extra $400 for a last minute flight."
Cons: "The plane didn't have enough gas to make it to SFO so we stopped in Colorado Springs to re-fuel. Despite being several hours delayed the airline customer service offered no solutions or accommodations."
Pros: "Nothing"
Cons: "We never boarded and they held us for 14 hours saying the plane was "delayed". What did we get for sticking it out that long while watching them make crying tired children sleep on the dirty floor refusing to admit their plane was cancelled, where they would have had to give us all hotel rooms. Oh yeah what did we get? $200 vouchers for future frontier flights. Really ironic because no one stuck in that hellish situation will ever try to fly frontier again."
Cons: "The price was good, before you realized the price was a lie and they scam you by charging $45 to carry on or $40 to check a bag! That meant the overhead space was unused and they were just charging more just to be inconvenient. The plane was stripped barebones. The crew were rude, did not smile, and gave me attitude for hitting my elbow with the drink cart. They charge for even getting a soft drink. Nothing about the experience said "we're serving you." It's worse flying a more expensive airline because the rediculous bag fees make it just as expensive and even things that should be free like pleasant staff were lacking."
Pros: "Not much"
Cons: "How does it save you money to make it so my seat doesn't decline. It what world does charging me me for a carry on make the flight better or "enhance" the customer experience?"
Pros: "Crew was nice despite the circumstances"
Cons: "Late takeoff. Sat in a hot aircraft for an hour. Small seats. No entertainment. Tiny tray led to my spilling a drink. Pilot sounded sketchy. Oh, and be aware you have to pay $35 for a carry on."
Cons: "I did not expect, after purchasing a ticket I would have to pay an additional fee for a seat. When ones buys an airline ticket they assume the seat is included. Additionally, just include the cost of carry on in the price of the ticket."
Pros: "pretty much nothing"
Cons: "seats were uncomfortable staff wasnt very friendly carryon luggage was expensive and I had to keep the one bag that i took under the seat in front of me and not up in the cabin"
Pros: "The flight from ATL to SFO was very inexpensive, but I thought the service and comfort equalled that on the major airlines. Unfortunately, my checked bag didn't arrive in SFO, where I was connecting on to a flight to Hawaii. Happily, when I asked to speak with a Frontier representative at SFO to notify them of the lost bag the rep arrived promptly and was very knowledgeable and professional. She arranged for my bag to be overnight FEDEXed (at Frontier's expense) to my hotel in Honolulu. I couldn't have had better service."
Cons: "The checked bag didn't make the flight."
Cons: "Frontier charges extra for a seat upon check in and also for a carry on! Terrible scam!!!"
Pros: "Flight was direct and smooth. Crew was nice."
Cons: "Most uncomfortable seats ever-and we paid an extra $45 per seat for extra legroom, hoping to be able to sleep-additional fees for everything, no beverage, snack or movie . Absolutely no frills. The seats are like molded plastic thrill ride seats with no padding. Awful."
Cons: "Arrived 45 minutes before flight, but attendant didn't accept my check in bag, and didn't let either of us proceed to the gate even though we both had checked in already."
Pros: "Nothing"
Cons: "I didnt like the fact that I couldn't talk to someone here in the United states for frontier. I didn't like that when I called customer service I was instructed to do the wrong thing and fill out the wrong form. And most of all I really hated that my flight was cancelled and my money put into a "shell credit" and when I went to re book the fight it cost 3 times the amount than I originally paid. Overall this has been a horrible experience and I will be tell everyone I know and even people I don't know via Facebook, Twitter, Instagram and snap chat about my experience . Overall I feel your service and your service provider failed miserably."
Pros: "I liked the crew"
Cons: "The flight was stacked with hidden fees and charges after my purchase. We had to pay for seats - in addition to the ticket price?! We had to pay for carry-ons.. And their food and beverage service has a price tag attached to everything. "Surprise! Your $50 flight costs $150 by the time you actually arrive!" ..sneaky."
Cons: "1. They charge for every little thing. Each checked bag is $25.00 and each carry on is $35.00. They also charge you for a seat. So once you purchase your ticket, you then have to pay an additional fee to seat down. 2. The staff is unprofessional. Not only does everyone look sloppy, but the staff is comprised of individuals that don't care at all about customers and have been poorly trained. The quality is very low. 3. I was hit and then verbally abused by a gentlemen on the plane, they laughed and did nothing!!!!! 4. They only allow 15 bags on their plane! After 15, they will move your bags to a different plane without telling you. What kind of nonsense is that?!"
Pros: "The individual staff at Frontier were good, people working a job with systemic challenges they can't change. "We have been having problems with the ground crew" was the courteous response I got from the person at SFO who took my lost baggage complaint. He was not at all suprised that I didn't arive with my bag having checked in two hours early for an hour long flight."
Cons: "I made the trip for work to attend demanding class with no time to shop for the essentials I lost with my missing bag. I didn't like the first impression i gave wearing "preworn othes" to meet my professional peers. Thanks Frontier."
Pros: "Service is nonexistent. Website doesn't work. Extra Charges for NOT using the website are insane. Food and beverages are nonexistent. Service is among the worst in the world. Seats aren't much more comfortable than folding chairs would be. Extra charges for absolutely every little thing ( which are normally free on every other airline ) make travel an annoying nuisance. Even carryon bags are charged --- and cost more than checked bags. It's insane."
Cons: "Service is nonexistent. Website doesn't work. Extra Charges for NOT using the website are insane. Food and beverages are nonexistent. Service is among the worst in the world. Seats aren't much more comfortable than folding chairs would be. Extra charges for absolutely every little thing ( which are normally free on every other airline ) make travel an annoying nuisance. Even carryon bags are charged --- and cost more than checked bags. It's insane."
Pros: "Nothing."
Cons: "I'd rather hop to San Francisco than fly frontier. A 4 hour 7 minute delay is a different flight than I booked."
Pros: "Nothing"
Cons: "Another plane malfunction! Last time we flew Frontier we were stuck for 2 days in FL! Never was another plane brought in for us. Never was another flight to,Cleveland bumped so we could return home. At least you figured out that disaster and we were able to board a plane scheduled for Philadelphia, which bumped that passenger to a flight 3 hours later. And the stories of horror other passengers had last night...all about Frontier, one man previously had totally missed a cruise! This is not how to maintain nor run an airlines. I will not be giving Frintier another chance."
Cons: "I got a first email stating that it was an 1 hr delayed ! Then another 2 emails stating that it s on time ! When i called i got put on hold for 17 min !! Then sure enough the flight was 4 hrs delayed !!!!!"
Cons: "- Flights are even more cramped than normal - the trays barely hold the beverage cup - no in flight entertainment - bringing a carry-on costs money - my return flight was delayed hours in advance, but frontier still required passengers to be in the airport - updates were few and far between and provided no concrete information - after being in the airport for 5 hours they just cancelled the flight and forced us to wait in the ticket line to rebook the flight which was another couple hours from start to finish - frontier refused to give hotel vouchers to people with in-state licenses, even if they lived hours away - after finally arriving back home, there was no gate ready for us and we had to park and/or taxi for at least another half hour - in both directions there were unruly children (not babies) YELLING on the plane without any comments or effort to quiet them by the flight crew or their parents"
Cons: "The airline charges additional fees every steps for the trip, including seat selection, baggage fees. We will not book on this airline again."
Pros: "The minimal interaction I had with the Crew suggested that they were nice."
Cons: "It was continuously delayed a total of five times. It was not explained why things were delayed. The spaces were cramped and the trays were small. Leads me to be interested in traveling in other "cheaper" airlines such as Spirit."
Pros: "Got me from point A to point B"
Cons: "Gate change at the last minute and the wrong destination city was displayed on the monitor for our flight, causing more confusion. Flight delay, as well"
Cons: "Seats don't recline, food tray very small, no free beverage except 1 cup water and most of all the unexpected 60 dollar charge for a CARRY-ON! Like the carry-on that easily fits in the over head space above and no one else charges for."
Cons: "Boarding - people who sit up front go first meaning that those that have seats in the back have to go in past people who are still in the aisles arranging themselves. I could not get a drink of water without paying. Is it really that esxpensive to give a coke and some peanuts??? Paying for seat selection means that some people get in the seats other peoiple want (like window seats) who don't want them. I tryly believe that Frontier is the nickel and diming airline. And I don't believe you had to wait for a gate and 11:30 at night."
Pros: "That they got me to my destination safely."
Cons: "This airline is a joke. Shame on me for booking late and choosing the cheapest ticket. BUT knowing what I now know, I would have selected the Delta flight for $80 more. Here's why: No TSA Pre-Check. This aspects alone is a deal breaker. Pay for carry-on bag AND IT COSTS $40. Pay for beverages, snacks. Seats don't recline - "pre-reclined for your maximum comfort." Whatever Tray table is metal and tiny. You couldn't even fit an iPad mini on it, let alone a lap top. So, I put my MacBook on my lap to work, but it's uncomfortable, MacBook slides off. You're hitting the person next to you with your elbows. AND I have to take off my jacket, to protect my MacBook against hitting the metal tray table, so I got cold. No internet. It's 2016. No internet. It's 2016. Never again."
Pros: "flight staff"
Cons: "OUTBOUND - confusion for me and others as gate changed and we had to go to international for domestic flight - thought it strange to suggest I pay additionally for a seat and a carry on. RETURN - again confusion for me and others as gate changed and no gate personnel at kiosk for quite awhile They don't even give a pretzel snack on these flights."
Cons: "Getting charged 60 dollars at the gate to bring my bag onboard and not being told at booking online that the price would increase isn't cool. This was my first trip with Frontier and will be my last. I am a business traveler who spends roughly 80k a year on travel-- and I'll never fly frontier again"
Pros: "overall the aircraft and schedule was ok"
Cons: "Our luggage did not arrive at our destination. It was an absolute nightmare to get it back!! I had to call the airline about 50 times, where most of the calls were not answered. I had to keep calling and following up. When the luggage did come they only delivered one of the 2 pieces. The calling marathon had to be resumed most of which went unanswered! We finally had to rely on the delivery company to provide alternate numbers where there was a possibility to get an answer. Absolute nightmare!!! Never never will I travel this airline."
Cons: "I was helping my mother - in - law check in and board - she needed wheel chair assistance. We were in line to drop off a bag that we had checked in online an hour before the flight. There were 5 people in the line with only 2 reps helping. Since I hadn't printed the boarding pass, I tried to print the pass at the self-help kiosks getting the message that I needed to see an agent. The cut-off for checked in baggage is 45 mins before the flight, however the reps were making no effort to expedite the service. In 15 mins they had helped 2 people making us the 3rd in line and the line had grown to an additional 5-6 people behind us. 45 mins before the flight they refused to take in any bags for checking - in. Since I was able to take the checked in bag with me, I asked that the agent print the boarding pass for my mother in law and call for wheel chair assistance. The agent called for wheel chair assistance but refused to print the boarding pass! The one thing that the ticketing / check in agent should be able to do is to print a boarding pass for a reservation that is fully paid. Because of this my mother in law had to miss her flight and we paid an additional $99 to get onto the next flight. I was so taken aback when the agent refused to print the boarding pass, that I did not even know how to convince her to do her job. This is probably the worst experience I have ever had with any airline!"
Pros: "The crew was exceptionally helpful on both segments."
Cons: "The seats were not comfy at all- no reclining whatsoever and had to prepay for every bag."
Cons: "Double charged for checked flight there and the way back $40 per person twice that's $200 I could've spent on a way better flight. Upgraded to the nicer seats which didn't lean back or do anything actually least amount of comfy"
Pros: "Low fare"
Cons: "No beverage service-not even free water, really? Having to pay even to suggest where you might sit. One gentleman had to pay for his carryon, even though it fit in the baggage size indicator."
COVID-19 information

Safety measures for airlines flying from Ontario to San Francisco

Airlines flying from Ontario to San Francisco have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from Ontario to San Francisco

Mandatory masks

Masks required on board, masks provided on flights from Ontario to San Francisco

Social distancing seating

Middle seats unavailable to book on flights from Ontario to San Francisco

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from Ontario to San Francisco

Flexible cancellations

Waiving of change fees. Search flexible flights from Ontario to San Francisco

Book cheap flights from Ontario to San Francisco

Recent round-trip flight deals

5/31Tue
nonstopMultiple Airlines
1h 22mONT-SFO
6/22Wed
nonstopMultiple Airlines
1h 31mSFO-ONT
$100
5/31Tue
nonstopFrontier
1h 22mONT-SFO
6/1Wed
1 stopFrontier
15h 22mSFO-ONT
$101
5/31Tue
nonstopMultiple Airlines
1h 22mONT-SFO
6/8Wed
nonstopMultiple Airlines
1h 31mSFO-ONT
$102
5/31Tue
nonstopMultiple Airlines
1h 22mONT-SFO
6/14Tue
nonstopMultiple Airlines
1h 31mSFO-ONT
$103
5/31Tue
nonstopMultiple Airlines
1h 22mONT-SFO
6/2Thu
nonstopMultiple Airlines
1h 23mSFO-ONT
$119
5/31Tue
nonstopMultiple Airlines
1h 22mONT-SFO
5/31Tue
nonstopMultiple Airlines
1h 23mSFO-ONT
$120
5/31Tue
nonstopMultiple Airlines
1h 22mONT-SFO
6/2Thu
nonstopMultiple Airlines
1h 23mSFO-ONT
$121
5/31Tue
nonstopMultiple Airlines
1h 22mONT-SFO
6/2Thu
nonstopMultiple Airlines
1h 23mSFO-ONT
$123
5/29Sun
nonstopFrontier
1h 24mONT-SFO
5/30Mon
nonstopFrontier
1h 21mSFO-ONT
$125
5/29Sun
nonstopFrontier
1h 24mONT-SFO
5/30Mon
nonstopFrontier
1h 21mSFO-ONT
$128
5/29Sun
nonstopMultiple Airlines
1h 24mONT-SFO
6/1Wed
nonstopMultiple Airlines
1h 23mSFO-ONT
$131
5/31Tue
nonstopFrontier
1h 22mONT-SFO
5/31Tue
1 stopFrontier
12h 33mSFO-ONT
$132
6/15Wed
nonstopUnited Airlines
1h 23mONT-SFO
6/21Tue
nonstopUnited Airlines
1h 31mSFO-ONT
$138
5/29Sun
nonstopFrontier
1h 24mONT-SFO
6/11Sat
1 stopFrontier
8h 59mSFO-ONT
$143
5/29Sun
nonstopFrontier
1h 24mONT-SFO
5/30Mon
1 stopFrontier
26h 59mSFO-ONT
$149
6/15Wed
nonstopUnited Airlines
1h 23mONT-SFO
6/18Sat
nonstopUnited Airlines
1h 31mSFO-ONT
$158
8/18Thu
nonstopUnited Airlines
1h 22mONT-SFO
8/25Thu
nonstopUnited Airlines
1h 31mSFO-ONT
$163
7/23Sat
nonstopUnited Airlines
1h 22mONT-SFO
7/26Tue
nonstopUnited Airlines
1h 31mSFO-ONT
$165
6/18Sat
nonstopUnited Airlines
1h 23mONT-SFO
6/21Tue
nonstopUnited Airlines
1h 31mSFO-ONT
$168
11/2Wed
nonstopUnited Airlines
1h 27mONT-SFO
11/6Sun
nonstopUnited Airlines
1h 18mSFO-ONT
$173

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Recent one-way flight deals

5/25Wed
nonstopFrontier
1h 23mONT-SFO
$27
5/25Wed
nonstopFrontier
1h 23mONT-SFO
$32
5/31Tue
nonstopFrontier
1h 22mONT-SFO
$33
5/25Wed
nonstopFrontier
1h 23mONT-SFO
$34
5/28Sat
nonstopFrontier
1h 23mONT-SFO
$36
5/29Sun
nonstopFrontier
1h 24mONT-SFO
$37
5/28Sat
nonstopFrontier
1h 23mONT-SFO
$38
5/24Tue
nonstopFrontier
1h 24mONT-SFO
$39
5/28Sat
nonstopFrontier
1h 23mONT-SFO
$43
5/26Thu
nonstopFrontier
1h 24mONT-SFO
$44
5/24Tue
nonstopFrontier
1h 24mONT-SFO
$49
5/29Sun
nonstopFrontier
1h 24mONT-SFO
$54
6/8Wed
nonstopUnited Airlines
1h 23mONT-SFO
$69
6/28Tue
1 stopMultiple Airlines
24h 20mONT-SFO
$80
6/23Thu
nonstopUnited Airlines
1h 23mONT-SFO
$85
6/13Mon
1 stopMultiple Airlines
25h 06mONT-SFO
$86
6/4Sat
nonstopUnited Airlines
1h 23mONT-SFO
$89
8/16Tue
nonstopUnited Airlines
1h 22mONT-SFO
$99
6/12Sun
nonstopUnited Airlines
1h 22mONT-SFO
$104
6/13Mon
1 stopMultiple Airlines
10h 48mONT-SFO
$108

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Ontario - San Francisco Flights

Departure:

Ontario (ONT)United States

Destination:

San Francisco (SFO)United States

Return flight deals:

San Francisco - Ontario

Cabin classes:

$472
$189
$40

Browse origins: