Find cheap flights from Ontario to San Francisco

ONT - SFO

Find cheap flights from Ontario to San Francisco

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Round-trip
Economy
Ontario (ONT)
San Francisco
Thu 5/13
Thu 5/20
Any month
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Good to know

Low season

AugustBest time to beat the crowds with an average 24% drop in price.

High season

NovemberMost popular time to fly with an average 33% increase in price.

Average price round-trip

$194(avg. price over the last 2 weeks)

Good deal round-trip

$183or less

Good deal one-way

$109or less

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 $109 or less one-way and $183 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 62% 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

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Top 4 airlines serving Ontario to San Francisco

Scores according to KAYAK customer reviews

8.3
Alaska Airlines
Overall score based on 29,354 reviews
8.5
Boarding
8.3
Comfort
8.8
Crew
7.9
Entertainment
7.9
Food
Airline reviews

Cons: "Nothing"

Pros: "yes"
Cons: "Lost baggage in Kathmundu"

Pros: "Everything"
Cons: "Nothing"

Cons: "Sold out of all meals, only snacks left, before reaching my row."

Pros: "very attentive crews."

Pros: "Great experience"
Cons: "Better meal, but great overall."

Cons: "Pilots were 50 mins late"

Pros: "good food and good movie selection."

Pros: "Seating choice"
Cons: "Boarding wasn't as bad as Delta... god they suck"

Pros: "Boarding and special request was excellent. We requested wheel chair for my mother and it was waiting at each arrival."

Cons: "Timeliness"

Cons: "The staff was exceptionally kind and understanding"

Cons: "When we landed we sat on the tarmac for over 30 minutes when they said 10 minutes."

Pros: "People were friendly and super helpful."

Cons: "Blankets"

Cons: "2 hours late, with no response as to why."

Cons: "None"

Cons: "Nothing, all was perfect!"

Cons: "Everything."

Pros: "Everything"
Cons: "My cabin bag has been misplaced and I siding receive the same."

Cons: "delays on both departure and arrival mobile boarding pass system did not work."

Pros: "Everything went smooth and was great besides the boarding."
Cons: "Boarding seemed to take quite quite awhile, not sure what the deal was but once we were boarded they kicked it into high gear"

Pros: "I did not like anything. The worst experience. I checked in through your site and got 11F seat which was changed when I took boarding card at airport to 32F. Later I came to know that they sold my seat even after my check in. So pathetic behavior. Never recommend this airline. They should learn from some of the Asian airlines."

Pros: "Great airline delayed 2 hours because of a new paint job on the plane. Sat on the runway in sfo"

Cons: "Delayed"

Pros: "It was all good."

Cons: "My luggages was not come at the destination. We don’t have clothes to changes for 2 days."

Cons: "No soft drinks. Really."

Cons: "the person nwxt to me was hesitant to stand ip when I wanted to go bathroom. Ither than that I lived it. Attendants were super nice which makes experience different."

Cons: "No comfort given to passengers despite 2.5 hr delay in leaving and another 1 hr on the ground after landing"

Pros: "Partnership with Virgin. Drink orders."
Cons: "boarding process didn’t go by the script and was a mess"

Pros: "Everything was easy and normal. I felt everyone was treated well."

Cons: "At boarding, when overhead bins are full, you cannot force passengers to check their bags if they had planned not to. I was in a rush when I land and because it was delayed too I did not want to also have to wait for my bag at baggage claim. I was completely late to an event I was to be at."

Pros: "Movies"
Cons: "Bathroom was disgusting, there wasn’t a trash so people threw their hand towels on the floor."

Cons: "Snotty steward in the back. Not pleasant."

Cons: "Reading lights did not work. Fortunately I could move"

Pros: "Everyone is so helpful and cheery"

Pros: "Very professional and helpful especially Ms Sahar in Ontario airport."

Pros: "The boarding process. The take off and the landing were great."
Cons: "Not enough room between passengers. Especially when you do not know the person next to you. More elbow room would be great. This is for the general seating. The isles are narrow too."

Pros: "Pleasant staff"

Cons: "Everything!!!"

Pros: "Team very nice and polite."
Cons: "All the airplanes should have screens"

Pros: "The extra seat next to me."
Cons: "The fact that my baggage got left in Portland."

Pros: "normal."
Cons: "."

Pros: "Loved the early arrival, the seamless process."

Pros: "Free wine"

Pros: "No delay, nice n comfortable"

Cons: "The lady on the kiosk this morning was annoyingly rude."

Cons: "Had a very muggy gross smell in there."

Cons: "Traveling in a 737-800, there is no displays at your seat. One must BYOD. Wifi was spotty."

Cons: "Delay of 1 h at Philadelphia to Syracuse !!"

Pros: "On time. Fast boarding. Comfortable seating."

Cons: "50 minute wait for a gate to deplane. How could there not be a gate at 10:30 pm? It’s not like our arrival was a surprise!?"

Cons: "On Time. Delayed advice 3 times."

Pros: "Comfortable"
Cons: "I was in 10C a So I was able to hear a disgruntled AA employee. Just like office politics. But up in the air. I didn’t need to hear"

Cons: "Delays sucked."

Pros: "Highly skilled pilot."

Pros: "Everyone was nice and it went smoothly!"

Pros: "No"

Cons: "Never made it"

Cons: "Delay luggage"

Pros: "entertaining system"
Cons: "food could be better, not bad though"

Cons: "See above"

Cons: "Entertainment is becoming too complicated for us old heads. Food, I still resent having to pay for something that is ed to be included in my fare."

Cons: "Never made it to Chicago, rerouted through Washington DC."

Pros: "On time departure. Early arrival. Lots of seat back movies."
Cons: "Need more new releases for movie selection."

Pros: "Friendly staff and helpful"
Cons: "Did not fly out of Ontario, I was being led to fly out of LAX since there was a delay. Ended up flying out of John Wayne Airport."

Pros: "great"

Cons: "The flight was delayed. The food was not great. There is not a lot of space in these planes, and it was a long flight. There is no power supply."

Cons: "No signage for checking bags. Was total cluster. No one knew where to take bags or what line to be in. Employees kept telling us we were in the wrong line but didn’t seem to tell us what was the correctly line."

Cons: "Lateness, seat comfort and gate checking a duffel bag"

Cons: "On time"

Cons: "headphone jack defective but more importantly the SFO arrival gate not available for over 45 minutes...."

Cons: "the connection time between flights was NOT adequate especially considering I had to go through customs! AA did page me and had a representative (I think his name was Brian) waiting for me to help me get to my connection. He gave me a bright red/orange tag. I still hit some barriers. I was stopped in security and my carry on was put aside to be searched. It sat and sat . I explained to the man I had to go. He said he was working alone, so I had to wait. I was ready to leave it and just run to catch the flight, but the security man said I wasn't allowed to do that. He finally called someone else to search my bag (nothing found) I did make it...barely!"

Pros: "The entertainment selection was pretty goid"
Cons: "They made a horrible mistake by getting the bag count or weight wrong and we had to go back to the gate and it cost us 2 1/2 hours."

Pros: "Everyone was courteous and professional"

Cons: "Everything was great"

Pros: "The boarding process was ok."
Cons: "The entertainment system failed again."

Pros: "Timely upgrade. Great service."

Pros: "Quick and did good job"
Cons: "After flying Japan Airlines I wish there were more free food and entertainment"

Cons: "No electrical outlets. No monitors"

Pros: "Loved the entertainment features. Great movie selection!"
Cons: "Nothing"

Pros: "Flight was on time."

Pros: "Took off and arrived on time."

Cons: "experienced a 1hr mechanical delay. it would be nice if refreshments were served."

Cons: "For a flight five hours or more I was disappointed that there was no complimentary food. It otherwise it was fine"

Pros: "blanket made it comfortable"
Cons: "No entertainment options"

Pros: "See above"
Cons: "See above"

Cons: "Surprisingly, AA provided the worst experience of the overall itinerary, compared to Aer Lingus and Iberia. The AA plane was outdated, cramped legroom - despite having purchased an "upgraded seat" and departed 1hr late"

Cons: "No Gogo entertainment"

Pros: "Crew"
Cons: "Before I booked the flight I noticed it was only on time 53% of the time. True to that number we were delayed almost an hour before takeoff. Why schedule fights so close if almost half the time it's delayed? Something needs to change."

Pros: "Good free entertainment. Thanks."
Cons: "No good free snacks. Only free drinks."

Pros: "That this flight didn't get cancelled"
Cons: "Well I didn't like that we sat at the airport for nearly 10 hours after multiple flight delays and cancellations. Why not just let us know we aren't going to be flying out. That way you could reduce the 10 hour anxiety attack and mixed emotions coming with all the drama. I also didn't like that the only flight we could get the next day was into San Jose (not SFO which is what I paid for) there wasn't any offer of reimbursement for hotel, taxi or flight. I also missed 2 extremely important fairs that my company was expected to participate in on Saturday Morning. I didn't like that when we landed in San Jose our bags were in SFO. Then American Airlines didn't want to get us a ride to SFO which we finally received after a lot of arguing which I don't find ideal. I feel like AA didn't take any responsibility. They kept saying it was weather related which I can't accept because other flights (including AA) were coming and going the entire day!!! One customer service member said the plane we were supposed to be on had to be maintenances and another said they didn't have a flight crew. The whole day was a disaster and it cost my thousands of dollars and many many hours of stress and anxiety."

Pros: "Entertainment"

Cons: "People still using mobiles as we were taking off. Crew seemed not too bothered."

Pros: "Tebsnacks were awesome!!"

Cons: "Same as above"

Pros: "Nothing absolute nightmare .. no water .. are you serious"

Pros: "Old plane"

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: "Flight left on departure and on board air cooling system was much welcome. Cabin crew were polite."
Cons: "Cabin was untidy, goodness knows what was stowed away at the back of seats towards the rear of the cabin, so rear of cabin was unwelcoming. Cabin crew should keep some overhead lockers for their own use. Poor sound quality on Inflight entertainment, either that or Headphones were poor. Food portions were painfully small (lunch of chicken risotto) AND I found pretzel flavoured breakfast bap unpopular."

Pros: "Read above"

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: "Food was way better than I expected."

Pros: "They gave out ice cream and plenty of snacks."
Cons: "I could not choose my seat"

Pros: "Food was great"

Pros: "Nothing"
Cons: "Everything"

Pros: "Nothing"
Cons: "Nothing"

Pros: "Attendents were very nice."
Cons: "Cramped"

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: "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: "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: "on time"

Pros: "Que acomoden a las parejas juntas."
Cons: "Asiento incomodo"

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: "Nice, respectful & very helpful attendance tall man @ the gait in SF prior boarding time. He help us getting the right seat for the trip. He was awesome help."
Cons: "Ontario delayed trip of almost 2 hrs. We could use that time more productively. Then, the other trip was a rush to made in time for Orlando. No entertainment in the plane."

Cons: "No food 14 hrs of hunger!"

Cons: "First my flight was cancelled. Then when they finally gave me a flight to San Francisco for my connecting flight they said that flight to seattle was delayed. Delayed to me is up to an hour. I waited for 3 hours past my scheduled take off time until my flight fonnaly took off. I have flown a lot in my life and this was by far the worst experience I've ever had on an airplane."

Cons: "It never took off! They did not reschedule, they were not attentive, it was absolutely terrible."

Cons: "TV was broken"

Cons: "Terrible."

Pros: "Everyone was helpful and friendly."
Cons: "Not charge so much for luggage and carry-ons."

Pros: "Quick boarding"

Pros: "Good"
Cons: "Good"

Pros: "When the bag size is small , boarding pas would not print without paying the $50, u would like to get refund"
Cons: "Most of the other do- passengers k we the rules of the airlines while I was unaware of the rule bad ended up paying$50 for a very small carry on luggage"

Pros: "Early, friendly staff"
Cons: "No WiFi"

Pros: "Boarding was fine ,no food or drink And charge for small carry on luggage $50-I don’t like it"

Cons: "It's $40 to bring a carry on... really?"

Pros: "Cheap, you travel from point A to point B"
Cons: "They don't even serve water!"

Pros: "Nothing"
Cons: "Everything"

Cons: "paying for bags is non refundable so dont change your mind"

Pros: "The plane didn't crash."
Cons: "Unorganized boarding. Uncomfortable. Required to pay for bags. More expensive to bring it on the plane with you, but couldn't even get them from baggage claim in a timely manner. Took over an hour for bags to come."

Pros: "canceled flights lack of knowledge.."

Pros: "nothing"
Cons: "delays,uncomfortable,bare bones,stoic"

Cons: "Seriously, extra charge for a seat and carryon? Crappy plane, etc."

Pros: "Bag charged"

Cons: "Delayed 2 plus hours Upon arrival into sfo over 1 hour and 30 mins to get bags"

Pros: "Very uncomfortable, otherwise acceptable"

Cons: "Everything is an upcharge - carryon, a seat that reclines, etc."

Pros: "Nothing"
Cons: "Everything. Safely back in SFO. That's it."

Pros: "Nothing"

Pros: "Nothing"
Cons: "Everything"

Pros: "Nothing."
Cons: "Everything."

Pros: "same as above"

Cons: "Frontier doesn't lease enough gates. Waited 35 minutes after landing for gate to clear. Both flights. Frontier late in unloading bags. Waited 40 minutes at luggage carousel. Frontier lost my bag"

Pros: "Inexpensive"
Cons: "Seat extremely uncomfortable for a person my height (6') and not adjustable in any way. Not a ton of leg room either, though not noticeably less legroom than other airlines."

Pros: "Delay for too long. It took so long after landing! What are the ground crews doing?"

Cons: "We were stuck on the runway for over an hour after we landed and getting our luggage was a DISASTER. They changed the location of our baggage claim carousel with minimal notice, only to change it back to the original carousel with NO NOTICE. It took over an hour again for our luggage to come out and it trickled in so slowly, that I ended up getting my bag a full two and a half hours after we landed. Awful experience."

Cons: "Frontier charges for the most basic amenities that other airlines provide (non alcoholic beverages and carry-on luggage space)."

Pros: "Not"
Cons: "Everything . Plus they lost my bag. Will neve fly Frontier again."

Pros: "It felt clean."
Cons: "Surprise charges for seat assignments and outrageous charges for carry on luggage. Uncomfortable sears with no leg room. Too many announcements, ads spoken through intercom."

Cons: "luggage was lost seating very cramped had to rush to board, almost missed connection"

Pros: "Friendly passengers around me"
Cons: "Long delay, no meals available, no water offered, nothing to read"

Pros: "Excellente"
Cons: "Excellent"

Pros: "nothing"
Cons: "everything. what has happened to frontier? wont fly them again"

Pros: "The bare bones frontier philosophy leaves nothing to like"
Cons: "Feeling like cattle"

Pros: "Cheapest airline ever"

Cons: "I wish you will take cash payments for meal purchase"

Pros: "seating too hard- need more cushioning"

Cons: "This airline comes up with every idea possible to charge the costomer. I give the airline a star for being sneaky and sly and having rules and policies to rip off passengers. Because it is brilliant that they con you without breaking any laws."

Pros: "Cheap, until you had to pay for bags and drinks."
Cons: "Had to wait for over 1/2 hour to disembark."

Cons: "Frontier nickles and dimes you."

Pros: "Very informative on where to go!"
Cons: "Not very informational on security policy"

Cons: "The Chicago airport was terrible both times. Things not clearly marked. Staff not friendly or available. Long term parking very hard to find and pricing very unclear. Didn't realize we would have to pay additional for just a seat and carry on luggage"

Cons: "Waiting on runway for 45 minutes, then having passengers arrested for complaining."

Pros: "Overall great experience. The entire staff was personable and it was a spurt smooth landing!"

Cons: "I will not fly Frontier again."

Pros: "Flying for cheap. Trays are too small"

Cons: "More delays, few answers, no satisfaction. Do whatever you can to avoid flying Frontier."

Cons: "it took 45 minutes for my bag to come out"

Read more about Alaska Airlines
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

Book cheap flights from Ontario to San Francisco

Recent round-trip flight deals

6/10
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Frontier
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Show more results

Recent one-way flight deals

5/27
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nonstop
Frontier
1h 30m
ONT - SFO
6/3
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6/6
Sun
nonstop
United Airlines
1h 22m
ONT - SFO
8/3
Tue
nonstop
United Airlines
1h 30m
ONT - SFO
6/3
Thu
1 stop
Alaska Airlines
7h 14m
ONT - SFO
6/6
Sun
1 stop
Alaska Airlines
11h 38m
ONT - SFO
5/23
Sun
nonstop
United Airlines
1h 31m
ONT - SFO
6/4
Fri
1 stop
Alaska Airlines
7h 14m
ONT - SFO
6/5
Sat
2 stops
Multiple Airlines
6h 39m
ONT - SFO
6/17
Thu
1 stop
American Airlines
7h 30m
ONT - SFO
9/7
Tue
2 stops
American Airlines
24h 22m
ONT - SFO
9/4
Sat
2 stops
American Airlines
10h 54m
ONT - SFO
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