Find cheap flights from San Francisco to Ontario

SFO - ONT

Find cheap flights from San Francisco to Ontario

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Round-trip
Economy
San Francisco (SFO)
Ontario
Fri 6/18
Fri 6/25
Any month
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Good to know

Low season

AugustBest time to beat the crowds with an average 26% drop in price.

High season

NovemberMost popular time to fly with an average 23% increase in price.

Average price round-trip

$225(avg. price over the last 2 weeks)

Good deal round-trip

$201or less

Good deal one-way

$109or less

When to book flights from San Francisco to Ontario

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 $201 or less round-trip.
  • The cheapest flight from San Francisco to Ontario was found 24 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 79% 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 San Francisco to Ontario

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Top 4 airlines serving San Francisco to Ontario

Scores according to KAYAK customer reviews

8.3
Alaska Airlines
Overall score based on 29,417 reviews
8.5
Boarding
8.3
Comfort
8.8
Crew
7.9
Entertainment
7.9
Food
Airline reviews

Cons: "I love Alaska"

Cons: "WIFI was not working"

Pros: "Everything"

Cons: "No screen on the seats."

Pros: "Quick boarding"
Cons: "More room"

Cons: "No worthy"

Cons: "the new saver fare option sucks, it makes travel more stressful and very undignified"

Cons: "I was not notified that my card was declined and this caused a ton of delays"

Cons: "The pkane changed departure times, so i was stuck in airport until 440 pm and i had to pay $60, to change ticket."

Cons: "The plane was amazingly cramped."

Cons: "Free food and blankets"

Pros: "Loved Japan Airlines"

Pros: "How smooth and orderly the whole trip went"
Cons: "N/A"

Cons: "No snacks :("

Cons: "It is much better now"

Cons: "Extra leg space"

Pros: "Yes."
Cons: "Yes"

Cons: "Nothing, all was perfect!"

Cons: "Delay Part not available"

Pros: "Awesome staff and plane. I Miss virgin!! well done to Alaska for keeping the spirit alive."

Pros: "Que aparte de la bebida sirvan un sanduche o algo para comer"

Cons: "Boarding via bus to plane. Delays due to mechanical issues at both departure and arrival. Staying on the plane while maintenance is performed. No complimentary snacks or drinks after losing value on ticket price."

Pros: "Fast!"

Pros: "Perfect trip no complaints!"
Cons: "I liked all of it"

Cons: "Seat was broken and would not recline so incredibly uncomfortable for red eye. I was freezing (though I’m often more chilly than others). Not great food options."

Cons: "You are no different then other airlines. Nothing sets you apart."

Pros: "Tv"
Cons: "No food"

Pros: "The plane was late. I was tired"

Cons: "I forgot my headphones. $3 to borrow a pair from virgin?"

Pros: "Had my bags in an incredible 10 minutes"

Pros: "Accommodated my disabled mother through the whole flying process. Thank you"

Pros: "Very professional and nice crew."
Cons: "Same as above"

Pros: "Arrived earlier. Good accommodations."

Pros: "That the plane was still there when I arrived at the gate."

Pros: "No delays"
Cons: "nothing to speak of"

Cons: "Delayed 2 hours."

Pros: "Prompt boarding"
Cons: "Sitting on the plane for 1.5 hours prior to departure because the plane was too light. This should be something that is determined prior to boarding the plane."

Pros: "Everything"
Cons: "Nothing"

Cons: "Better vegan snacks available for purchase would be great."

Pros: "Same as before."

Pros: "The staff was super friendly and the plane was new. It felt brand new."

Pros: "the ease of booking"

Cons: "the meanest most rude racist hostess ever! her insinuations and degrading way of speaking to me left me speechless. i will file a format complaint and might even take it further."

Pros: "I was checking in in a fluster and trying to attach my bag tags. A agent came over and helped me (for some reason I had taken the entire sticky back off ha!) and then he took my bag for me right from the kiosk. I was super impressed"

Cons: "needed more water"

Pros: "Everything"
Cons: "Everything"

Cons: "The diy watch movies on my own device wouldn't load. More frequent trash pick up."

Pros: "Play more Christmas carol during Christmas season"

Cons: "If United can serve more than orange juice or water, so can you"

Pros: "The boarding process was very smooth and we took off early and the crew was great and then we also arrived 30 minutes early."
Cons: "Nothing could be changed."

Cons: "Crowded and hot just like Miami"

Cons: "No delays"

Pros: "On time. Warm greetings from the pilots. New aircraft, clean, great entertainment."

Cons: "It is what it is, doesn’t have to be better"

Pros: "seat was basic. prefer having tv screens in the seatbacks as opposed to using my tiny phone as a viewing screen."
Cons: "prefer having tv screens in the seatbacks as opposed to using my tiny phone as a viewing screen. only food available besides pretzel was pay food."

Cons: "The gate agents called all boarding groups with the boarding queue extending the entire length of the jet bridge and into the terminal beyond the gate area, making us stand in line ten to fifteen minutes longer for no reason."

Pros: "Comfortable"

Pros: "great entertainment"

Cons: "It would’ve been nice if we made it to fort Meyers!"

Pros: "Boarding was very smooth because the fligh had a lot of Sears availabke"
Cons: "Make AA a real earline to serve passengers not profits"

Pros: "Puntual, connexion gates very closed,"
Cons: "I need to paid 100$ or more to have a seat"

Pros: "Everything no complain"
Cons: "I like everything Everything no complain"

Pros: "Service and boarding was smooth and friendly."

Pros: "Nothing"
Cons: "The seat assignments based on loyalty status - rude gate agents"

Pros: "Plane was on time, good service, main cabin extra is nice with my knees"
Cons: "No problems"

Cons: "Breakfast - lots of sugary items"

Pros: "N"

Pros: "The flights were on time and the staff was very friendly."

Pros: "Nice new aircraft - clean and comfortable. Entertainment selection and system is excellent. SFO airport is clean and efficient"
Cons: "I DO NOT like JFK airport. The signage is poor and it's difficult to figure out where you need to go. There aren't enough monitors and people in the airport are rude (including staff)"

Pros: "Delayed and no AC working..."

Pros: "The quickness at which they discovered my suitcase was missing even before I got to the luggage carousel and sent me text. The quickness at which my suitcase was found, put on another plane and returned to me the next day by noon to my home. There was nothing missing."
Cons: "That damage on my suitcase is not covered. Corner was torn 8 inches and a tear in the fabric. But it wasn't my expensive suitcase. It got caught on the carousel I sure because the paper identifying strips got caught somewhere."

Pros: "Good friendly service. Flights were on time."

Cons: "I was on a flight to Dallas on an American Airline flight which arrived late due to weather conditions, and the connecting flight didn't even wait for me although they know why I couldn't make it on time. And I was only late for about 5 minutes."

Cons: "I'm getting to Madrid 24 hrs after I was supposed to"

Pros: "while our flight was delayed, they kept us well-informed about what was happening and didn't leave us in the dark. We were delayed because an fight attendant failed to show up, and there happened to be another off-duty flight attendant passenger on board who volunteered to work the flight so that we could still depart on time. Real thoughtful dedication!"

Cons: "Essentially a bus ride with the comfort of a wooden bench."

Pros: "Did not use"
Cons: "Tight seating"

Cons: "I got to Moscow, SVO. I didn't receive my bag. This sucks."

Pros: "The food was great!"
Cons: "The new baggage rule limits you to two bags in business on international flights☹️"

Pros: "Pilot did good job in tricky conditions at landing."
Cons: "Wish food were served."

Pros: "Everything was on time and luggage arrived at my final destination"
Cons: "Free wifi would be amazing :)"

Pros: "NOTHING"

Pros: "The entire fly, connections, food and both crews excelente. Flight on time."

Pros: "Airline and crew looked after us and kept us informed. My app said the flight was delayed but the captain didn't seem to know this so we sat for half an hour or more after planned departure. Maybe he hoped to get an earlier slot. We were 30 mins late in the end."
Cons: "No food for purchase, just a drink and biscuit."

Pros: "Good service, as efficient as possible"

Pros: "Headrest entertainment systems"
Cons: "Lack of comfort in the seat, pay for every little thing, departed late, 90% of all passengers seems to be lumped in "Group 6" making boarding extremely annoying. I suppose any other group costs extra."

Pros: "No food at all."

Cons: "Late by 40 min"

Pros: "The comfortable sitting and good hospitality by staff. Timely departure and smooth landing of aircraft."
Cons: "Nothing"

Pros: "Na"
Cons: "AA worst airline People They have working in SFO Incompetent Rude Useless"

Cons: "It was delayed for about a half an hour. Other than that it was great"

Pros: "On time"
Cons: "They charge for everything luggage they can see in the front desk. My 63 years old mother had her small size hand carrier, a travel tote on top (with her travel blanket and her medicine) and a crossbody passport size. They told her to put it in her tote!!! Only 2 items allows. ... In the plane she saw passengers carried way more than what that."

Pros: "Lots of free movies."
Cons: "No free food."

Cons: "it was really bumpy"

Cons: "I was told I had to check my duffle bag at the gate, that there was no room for it. When I dot to my dirty seat I found room for three of my bags in the overhead compartment."

Cons: "Pathetic airline service especially towards senior citizens.. One of the worst airline.. Poor baggage tracking system and Etihad staff lacks knowledge about their own airline.."

Cons: "no food, no entertainment, seemed like a pretty, seemed like an old plane judging from the interior"

Pros: "On time arrival despite two issues at the departure gate"

Pros: "Friendly and courteous service."
Cons: "Small legroom."

Cons: "Not social distanced full flight"

Pros: "Flight attendant was good"
Cons: "Everything else needed improvement"

Pros: "Flight departed on time. Good seat pitch in economy. Food and beverages included and tasted good surprisingly. Crew were helpful and efficient. Plenty of entertainment options for film, TV and music."
Cons: "Do not like the process of boarding by group number. Another way of squeezing money out of the consumer. Also causes chaos when trying to board. Seats too narrow in economy especially if your broad shouldered."

Cons: "I was flying with Air Canada. The UI for watching movies was not good, it had a hard time to respond to the inputs. It was also hard to move the videos forward to the part I needed. Plus, the audio wasn't working well with my own earphones."

Cons: "The flight was delayed, the first most important part is to depart on time keeping in mind the customers schedule as well that are travelling with the airline. No communication between the airline and ground department, was not happy at all and probably not fly unites again. Also they charge bags?"

Cons: "No Wi-Fi but swayback said Wi-Fi"

Pros: "That the flight wasn't any longer than it was"
Cons: "A bit hot n stuffy"

Pros: "Nothing"
Cons: "I missed my sister graduating because of avianca"

Pros: "Boarding, service, staff attitudes, on time and deplaning"

Cons: "Staff kinda rude"

Cons: "So uncomfortable."

Pros: "SFO-SYD was great. My luggage was left behind in SYD when I landed QZN!!! Not amused!"
Cons: "Them losing my luggage!"

Pros: "Arrived a little early!"
Cons: "7/8 size Brazilian airplane."

Pros: "nothing"

Cons: "Late to board. Slow to run through safety. Late late late"

Pros: "The Boeing 787 plane was very nice. The window shading control is unique!"
Cons: "Thanks United for keeping my diet in check."

Pros: "On time , and good service"
Cons: "Na"

Pros: "Everything ran on time and the staff was very friendly."

Pros: "Although there was a slight delay, the flight was pleasant and the service very nice. We got twice something to drink and a snack. For the short flight, quite remarkable."
Cons: "Everyting was fine"

Cons: "San Francisco to Ontario Delay for 10 min Then another dealy for 30 min After we board we had to waite inside the air craft for Cataring company to delever food for first classe"

Pros: "The Crew attention was nice and very proffessional. Good coffee"
Cons: "We are very tired and the airplain isn't comfortable."

Cons: "Very uncomfortable seats, got delayed on the return trip again. Got home very late."

Pros: "Great, friendly service Smooth flight"

Pros: "Plane wasn't full"
Cons: "Coffee grounds in the bottom of my cup Seats way too small for a normal person much less for Someone with extra."

Pros: "N/A"
Cons: "Kept me keep waiting for aircraft for 4 hours and toward the end told me that the flight got cancelled. Then they scheduled me to the 10:45pm flight, and the aircraft didn't come in till 12:40am. I've been waiting at the airport for more than 13 hours"

Cons: "the plane was cold early in the morning. I was feeling cold in the plane."

Cons: "It was a very small plane."

Pros: "Easy quick boarding - attendants seemed to watch and keep the misc items from going into the overhead."
Cons: "Being woken up to see if I wanted water or food"

Cons: "Long delay in San Francisco"

Cons: "Plane got super delayed last minute without notice until arriving there at the gate."

Pros: "okay"
Cons: "okay because it was short"

Pros: "The stewardess miss polanxo was great"

Pros: "Good crew"

Pros: "Awesome stewardess Donna gave me the opportunity to find a clear row to myself for more room being a wider guy and was an all around class A attendant. Excellent hospitality, thank her much. And thank the crew for such a smooth flight!"

Pros: "Flight was on time, crew was nice."

Cons: "My itinerary had to completely change."

Cons: "always delay!!"

Cons: "Constant updates, saying more delays"

Cons: "My luggage got soaked in overhead compartment. Signed rare book was ruined by another passengers' luggage that leaked liquid and soaked my bag and contents inside."

Cons: "Everything was good"

Pros: "Fast flight, friendly and funny crew."

Pros: "The crew was very friendly and caring"
Cons: "I was at the gate 15 minutes like it says on the ticket which never happens because I'm always about half an hour to 45 mins early but when I got there they had given myou seat away that was not cool"

Cons: "have no idea if I'll even make it thru the day."

Pros: "Staff seemed lively and created good atmosphere; thank you."

Pros: "The crew was very pleasant and professional in spit of all the grumbly passengers."
Cons: "First boarding was aborted and passengers were sent back up jetway to waiting area. This was due to a mechanical issue with the plane, which I am glad they noticed and took care of. However, getting to the plane's door and then being told to go back to the waiting area was unpleasant."

Pros: "Movies were ok."
Cons: "Openly rude, almost argumentative staff. I was afraid to talk back because the last thing I want is any accusation of bad behavior on an airplane. But if this were a restaurant, the customers would get up and leave without eating. I've never had this experience on China Airlines or Japan Air. I will never use UA again."

Cons: "Yet another delay.."

Pros: "Google service on United Airlines not pleasant in the flights were delayed all the time"
Cons: "Bad experience flying with United Airlines sorry"

Cons: "Late and rude"

Pros: "price was great for new years day."
Cons: "flight was delayed due to a late flight attendant and then delayed again because they flight attendant didn't know about her destinations and thrn delayed again so she could prepare for her upcoming trips. This was all announced on the PA system. In total, the flight was delayed about an hour and 20 minutes."

Pros: "more assistance to passengers!!"
Cons: "back up plans!food for passengers specially for the kid!"

Pros: "Yes"
Cons: "Thanks , perfect , not a thing"

Cons: "No wifi, no tvs or media, all food and drinks are for-pay"

Cons: "Negative leg room, Hugh bag fees that were not stated in the original purchase"

Pros: "Nothing very disappointed with Frontiers service"
Cons: "From Ontario to Austin we were charge $50 for each carry on luggage we 1 for me 1 for my husband total $100 charge From Austin to Ontario carry on luggage was free why?Im filling complained about the airline"

Cons: "we waited 2.5 hours for the baggage claim."

Cons: "Unexplained delay is not ok."

Cons: "No coffee was available"

Cons: "Late.. U had to purchase everything"

Cons: "SFO->MCO: 2.3 hours delay, departed at 1:30AM MCO->SFO: >4 hours delay, arrived at SFO at 1:30AM"

Cons: "It was seriously delayed"

Pros: "Nothing. Will not fly Frontier again."
Cons: "EVERYTHING."

Pros: "Did not travel due to weather"
Cons: "Didn't travel due to weather"

Cons: "None"

Pros: "The referee was delayed by over 4 hours due to avoidable maintenance issues. Not acceptable!"

Pros: "Actually not much. The cost is ridiculous and not enough leg room. I waited quite awhile for wheelchair assistance. However the two men who took care of me were great. One in San Francisco and one in Cincinnati."

Pros: "All"

Pros: "not much"
Cons: "boarding process was a disaster. no one knew what they were doing. $30 for a carry? seriously? No free snack on the plane. Everything cost $5-$10... never again will i fly Frontier."

Cons: "We sat on the tarmac for about 1.5 hours in Denver before we could leave the plane."

Cons: "4 hr delay due to personnel issues"

Pros: "Cheap"
Cons: "Seat cannot be declined! Plane also made an awful noise when taking off and landing!"

Cons: "We boarded 30 minutes late and therefore took off and landed 30 minutes late without any acknowledgement whatsoever. It seemed almost nonchalant that everything was a half hour behind schedule, and there was no explanation. Not awesome."

Pros: "Quick efficient"
Cons: "Legroom"

Pros: "Absolutely nothing to like about frontier. You get worse than you pay for with frontier."

Cons: "I had to pay $9 for 2 cans of soda and 2 small snacks. You could only pay be credit card and it had the option of leaving a tip! They charge too much for little things that other airlines include for free."

Pros: "Nothing"
Cons: "Delays, late bags, poor service"

Pros: "It was fun and playful!!! Never had such an amazing trip back to Houston."

Pros: "stewardess was nice"
Cons: "late arrival in Denver, then, "not enough staff "to unload us and get us into the terminal-waited in plan almost an hour . 1 hour Late takeoff from Denver. plane seat does not recline, tight I wont take frontier again"

Cons: "We were left on the tarmac for 100 minutes after landing. Given No information; not allowed to get up for the bathroom. Terrible."

Pros: "The competence of the on board personnel."
Cons: "The lack of communication with passengers at the gate."

Cons: "Charged for every additional thing so the cost of the ticket was not true."

Pros: "Nothing"

Pros: "Upgraded us!"
Cons: "Told us the Wrong carrosol for our baggage."

Cons: "Horrible costumer service, charge $40 for a carry on"

Pros: "Boarding was quick"
Cons: "Nothing"

Cons: "A little noisy"

Pros: "Nothing"
Cons: "3 hours of delay, no respect and appreciation of the wait."

Cons: "bag fees and slow boarding"

Pros: "nothing"
Cons: "everything"

Cons: "Not worth an upgrade. Took over an hour for bags in baggage claim."

Pros: "attendants were helpful and friendly"
Cons: "would like some reading materials since they don't have entertainment anymore."

Pros: "Nothing"
Cons: "Every thing went wrong with the airline. They have no character"

Cons: "dirty"

Cons: "Terrible service"

Cons: "40 USD carry-on fee or 30 USD check-in baggage fee not included in the ticket. The plane had things left by previous pessengers (napkins, tickets). Everything on board charges. Not a happy experience. I felt like I was being robbed. Hope that no one will ever be cheated by Frontier thereafter."

Cons: "Fronteir's cabin is pretty bare bones. Plus they lost my luggage. Having no jacket on a freezing night in Denver was brutal."

Cons: "Great experience but for the exorbitant bag check rates"

Cons: "Lots of delays"

Pros: "I was easliy checked in"
Cons: "It was more then an hr late The plabe shook all the ride long It felt terribly unstable"

Pros: "Nothing"
Cons: "Everything"

Read more about Alaska Airlines
COVID-19 information

Safety measures for airlines flying from San Francisco to Ontario

Airlines flying from San Francisco to Ontario 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 San Francisco to Ontario

Mandatory masks

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

Social distancing seating

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

Pre-flight testing

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

Book cheap flights from San Francisco to Ontario

Recent round-trip flight deals

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