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ONT - SFO

C$ 85 Find cheap flights from Ontario to San Francisco

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to San Francisco departing on 28/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Sat 8/6
Sat 15/6

Search hundreds of travel sites at once for deals on flights to San Francisco

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Francisco, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Francisco, as well as popular online travel agencies
In the last 7 days, travellers have searched 43,968,530 times on KAYAK, and here is why:

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Cheap flight deals from Ontario to San Francisco (ONT-SFO)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to San Francisco that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
7:36 a.m. - 9:02 a.m.ONT-SFO
1h 26mdirect
5:15 a.m. - 6:36 a.m.SFO-ONT
1h 21mdirect
C$ 85Frontier
Find Deal
Sun, 28 Jul - Tue, 13 Aug
7:36 a.m. - 9:02 a.m.ONT-SFO
1h 26mdirect
5:15 a.m. - 6:36 a.m.SFO-ONT
1h 21mdirect
C$ 91Frontier
Find Deal
Fri, 26 Jul - Sun, 11 Aug
1:55 p.m. - 3:20 p.m.ONT-SFO
1h 25mdirect
11:10 a.m. - 12:45 p.m.SFO-ONT
1h 35mdirect
C$ 268United Airlines
Find Deal
Tue, 4 Jun - Wed, 5 Jun
4:35 p.m. - 11:45 p.m.ONT-SFO
7h 10m1 stop
11:00 a.m. - 8:10 p.m.SFO-ONT
9h 10m1 stop
C$ 298Southwest
Find Deal
Tue, 4 Jun - Wed, 5 Jun
6:00 a.m. - 7:25 a.m.ONT-SFO
1h 25mdirect
8:57 p.m. - 10:29 p.m.SFO-ONT
1h 32mdirect
C$ 323United Airlines
Find Deal
Tue, 28 May - Fri, 31 May
5:50 a.m. - 6:05 p.m.ONT-SFO
12h 15m1 stop
3:35 p.m. - 10:30 p.m.SFO-ONT
6h 55m1 stop
C$ 404Southwest
Find Deal
Tue, 28 May - Fri, 31 May
6:00 a.m. - 9:35 p.m.ONT-SFO
15h 35m2 stops
6:00 a.m. - 11:58 p.m.SFO-ONT
17h 58m1 stop
C$ 425Alaska Airlines
Find Deal
Wed, 5 Jun - Wed, 12 Jun
6:00 a.m. - 9:35 p.m.ONT-SFO
15h 35m2 stops
9:51 p.m. - 9:05 a.m.SFO-ONT
11h 14m1 stop
C$ 451Alaska Airlines
Find Deal
Wed, 12 Jun - Mon, 17 Jun
7:00 a.m. - 11:29 p.m.ONT-SFO
16h 29m1 stop
10:20 a.m. - 11:44 p.m.SFO-ONT
13h 24m2 stops
C$ 801Delta
Find Deal
Thu, 8 Aug - Tue, 13 Aug
6:00 a.m. - 6:20 p.m.ONT-SFO
12h 20m1 stop
10:20 a.m. - 11:44 p.m.SFO-ONT
13h 24m2 stops
C$ 846Delta
Find Deal
Mon, 5 Aug - Tue, 13 Aug

Flights from Ontario to San Francisco - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to San Francisco to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to San Francisco?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to San Francisco, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Ontario to San Francisco is April, where tickets cost C$ 162 on average. On the other hand, the most expensive months are March and November, where the average cost of tickets is C$ 217 and C$ 217 respectively.

How far in advance should I book a flight from Ontario to San Francisco?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to San Francisco, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ontario to San Francisco, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 78 days before departure.

Which airlines provide the cheapest flights from Ontario to San Francisco?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the best return deals on flights connecting Ontario to San Francisco were found on Frontier (C$ 85) and United Airlines (C$ 268). Southwest proposed the cheapest one-way flight at C$ 129.

Which airlines fly direct between Ontario and San Francisco?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Ontario to San Francisco.
There are 2 airlines that fly direct from Ontario to San Francisco. They are Frontier and United Airlines. The cheapest airline for this route is Frontier, with the best deal found costing C$ 79. On average, the best prices for this route can be found at Frontier.

How many flights are there between Ontario and San Francisco per day?

Each day, there are between 5 and 6 nonstop flights that take off from Ontario and land in San Francisco, with an average flight time of 1h 27m. The most common departure time is 1:00 p.m. and most flights take off in the morning. Each week, there are 39 flights. The most frequent day of departure is Saturday, when 15% of all weekly flights depart. The fewest flights depart on a Friday.

Which cabin class options are there for flights between Ontario and San Francisco?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from Ontario to San Francisco take?

Direct flights take on average 1h 25m to travel the 941 km between Ontario and San Francisco.

What’s the earliest departure time from Ontario to San Francisco?

Early birds can take the earliest flight from Ontario at 5:50 am and will be landing in San Francisco at 7:15 am.

What’s the latest departure time from Ontario to San Francisco?

If you prefer to fly at night, the latest flight from Ontario to San Francisco jets off at 8:50 pm and lands at 10:12 pm.

Good to know

Low season

January

High season

June

Cheapest flight

C$ 85
Best time to beat the crowds but there is an average 37% increase in price.
Most popular time to fly and prices are also 20% lower on average.
Flight from Ontario to San Francisco

When to book flights from Ontario to San Francisco

Are your dates flexible? Find out the best times to travel from Ontario to San Francisco based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to San Francisco

  • What other airports can I board my flight to SFO other than ONT?

    Apart from ONT, Ontario is served by John Wayne Airport (SNA) and Long Beach Airport (LGB). Of the two, SNA is closer to Ontario than LGB making it the best option if you are looking for something close-by.

  • Where can I breastfeed my child at ONT?

    If you want to breastfeed your baby at ONT, you can do so in one of ONT's two operational nursing rooms. In terminal 2 there’s a nursing room located across from gate 207 and in terminal 4 there is one found across gate 407.

  • Does SFO have a place I can relax once my flight lands?

    Once you land at SFO, you can enjoy the rejuvenating services at one of the three locations operated by XpresSpa. In terminal 3, XpresSpa has a locationnear boarding area E, while the other is found in the boarding area F. The third location is found in the international terminal boarding area G.

  • Can I rent a car at SFO?

    At SFO, you can easily rent a car once you land. To do so, you’ll have to visit the airport’s Car Rental Center, which houses rental agencies like Thrifty, Enterprise, Budget, and Dollar. To get to the airport’s Car Rental Center, you’ll board its AirTrain Blue Line which will take you right there.

  • What is the cheapest flight from Ontario to San Francisco?

    In the last 3 days, the lowest price for a flight from Ontario to San Francisco was C$ 94 for a one-way ticket and C$ 62 for a round-trip.

  • Which airlines offer Wi-Fi service onboard planes from Ontario to San Francisco?

    All the following airlines offer inflight Wi-Fi service on the Ontario to San Francisco flight route: JetBlue, Alaska Airlines, Delta, American Airlines, Japan Airlines, Lufthansa, and Iberia.

  • Which aircraft models fly most regularly from Ontario to San Francisco?

    The Airbus A320neo is the aircraft model that flies most regularly on the Ontario to San Francisco flight route.

  • Which airline alliances offer flights from Ontario to San Francisco?

    Star Alliance is the only airline alliance operating flights between Ontario and San Francisco.

  • On which days can I fly direct from Ontario to San Francisco?

    There are direct flights from Ontario to San Francisco on a daily basis.

  • How does KAYAK find such low prices on flights from Ontario to San Francisco?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to San Francisco.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to San Francisco?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to San Francisco?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to San Francisco?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding a cheap flight from Ontario to San Francisco

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 68 or less one-way and C$ 357 or less round-trip.
  • To pass through the security checkpoints at Ontario International Airport (ONT), you’ll need to budget a good amount of time. On many occasions, travelers have missed their flights at this airport after being held up at its checkpoints. To avoid finding yourself in a similar situation, the day you’re set to fly to San Francisco International Airport (SFO) from ONT, you should get to the airport at least 2 hours before your flight.
  • If you want to withdraw some cash before departing from ONT, you can do so without hassle from one of the airport's several ATMs. These ATMs are located on the upper and lower levels of terminals 2 and 4, near the front entrance to the international terminal, and in the airport’s car rental facility.
  • While waiting for your flight to San Francisco at ONT, you can purchase a meal of your choice at one of the airport's numerous restaurants. In terminal 2, you can eat at Wolfgang Puck Pizza, Cross Grain Brewhouse, or Harvest & Grounds. In terminal 4, you can eat at Rock & Brews, Wahoo’s Fish Taco, or Coffee Bean & Tea Leaf.
  • If you need to do some work or fax documents once you land at San Francisco International Airport (SFO), you should check out SFO’s business center. Located in the main hall of the international terminal, the center operates from 8 a.m. to 8:30 p.m.
  • In case you want to leave some of your luggage at SFO before proceeding with your journey, you’ll be happy to hear about SFO’s Airport Travel Agency which offers luggage storage services. They are located in the main hall of the international terminal.
See more tips

Prefer to fly non-stop from Ontario to San Francisco?

Find which airlines fly direct from Ontario to San Francisco, which days they fly and book direct flights.

Nonstop departures

Ontario to San Francisco

Monday

Air Canada, Frontier, United Airlines, +2 more

Air Canada, Frontier, +3 more

Tuesday

Air Canada, Copa Airlines, Frontier, +2 more

Air Canada, Copa Airlines, +3 more

Wednesday

Air Canada, Copa Airlines, Frontier, +2 more

Air Canada, Copa Airlines, +3 more

Thursday

Air Canada, Copa Airlines, Emirates, +2 more

Air Canada, Copa Airlines, +3 more

Friday

Air Canada, Emirates, Frontier, +2 more

Air Canada, Emirates, +3 more

Saturday

Air Canada, Emirates, Frontier, +2 more

Air Canada, Emirates, +3 more

Sunday

Air Canada, Copa Airlines, Emirates, +2 more

Air Canada, Copa Airlines, +3 more

See more nonstop flights

Nonstop returns

San Francisco to Ontario

Monday

Air Canada, Frontier, United Airlines, +1 more

Air Canada, Frontier, +2 more

Tuesday

Air Canada, Copa Airlines, Frontier, +2 more

Air Canada, Copa Airlines, +3 more

Wednesday

Air Canada, Copa Airlines, Frontier, +2 more

Air Canada, Copa Airlines, +3 more

Thursday

Air Canada, Copa Airlines, Frontier, +2 more

Air Canada, Copa Airlines, +3 more

Friday

Air Canada, Frontier, United Airlines, +1 more

Air Canada, Frontier, +2 more

Saturday

Air Canada, Frontier, United Airlines, +1 more

Air Canada, Frontier, +2 more

Sunday

Air Canada, Copa Airlines, Frontier, +2 more

Air Canada, Copa Airlines, +3 more

See more nonstop flights
See more nonstop flights

Top airline flying from Ontario to San Francisco

 
See real verified KAYAK customer reviews for airlines flying from Ontario to San Francisco. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to San Francisco? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
6.2
FrontierOverall score based on 4088 reviews
7.1Crew
5.2Food
5.8Comfort
6.6Boarding
4.9Entertainment
Airline reviews

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

2.0 MediocreJanay, Apr. 2024LAX - PHX
Read more about Frontier reviews

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Terrible. Seats are bad and the baggage policy is inconsistent

Better than I expected but I did pay for a seat and carry on bags ahead of time.

The boarding time. I was in Section 1 the lady in charge just let people in section 3 without see us. Make a line , I have to step out and ask her. We were in the line and she just take my ticket and that’s it, so if I don’t ask her she could leave us at the end! We paid more for that privilege and. She doesn’t care….

I hope to avoid flying with them in the future. First flight got cancelled then got stuck with a 13 hour layover in Denver. The process was long and frustrating to many people.

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

Book cheap flights from Ontario to San Francisco

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to San Francisco found on KAYAK in the last 72 hours.
24/10Thu
1 stopSouthwest
4h 00mONT-SFO
C$ 129
28/5Tue
directUnited Airlines
1h 25mONT-SFO
C$ 173
24/10Thu
2 stopsSouthwest
6h 30mONT-SFO
C$ 180
2/6Sun
directUnited Airlines
1h 25mONT-SFO
C$ 194
2/6Sun
1 stopSouthwest
9h 05mONT-SFO
C$ 216
13/8Tue
2 stopsAlaska Airlines
16h 42mONT-SFO
C$ 231
28/5Tue
1 stopSouthwest
4h 25mONT-SFO
C$ 235
4/6Tue
2 stopsAlaska Airlines
16h 14mONT-SFO
C$ 243
7/6Fri
1 stopDelta
8h 25mONT-SFO
C$ 574
6/6Thu
1 stopDelta
6h 50mONT-SFO
C$ 1,094

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Last minute flights from Ontario to San Francisco

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Ontario to San Francisco that are departing in the next 10 days.
10/5Fri
multi-stopFrontier
4h 37mONT-SFO
13/5Mon
directFrontier
1h 29mSFO-ONT
C$ 739
10/5Fri
multi-stopFrontier
12h 54mONT-SFO
13/5Mon
directFrontier
1h 29mSFO-ONT
C$ 752
14/5Tue
directUnited Airlines
1h 28mONT-SFO
17/5Fri
multi-stopUnited Airlines
14h 05mSFO-ONT
C$ 870
14/5Tue
multi-stopAlaska Airlines
11h 25mONT-SFO
15/5Wed
multi-stopAlaska Airlines
13h 28mSFO-ONT
C$ 1,136
14/5Tue
multi-stopAlaska Airlines
11h 25mONT-SFO
15/5Wed
multi-stopAlaska Airlines
12h 48mSFO-ONT
C$ 1,197
14/5Tue
multi-stopAlaska Airlines
9h 08mONT-SFO
16/5Thu
multi-stopAlaska Airlines
8h 26mSFO-ONT
C$ 1,212
14/5Tue
multi-stopAlaska Airlines
8h 20mONT-SFO
16/5Thu
multi-stopAlaska Airlines
10h 34mSFO-ONT
C$ 1,219
10/5Fri
multi-stopFrontier
4h 37mONT-SFO
13/5Mon
multi-stopFrontier
7h 27mSFO-ONT
C$ 1,308
10/5Fri
multi-stopFrontier
4h 37mONT-SFO
12/5Sun
multi-stopFrontier
23h 01mSFO-ONT
C$ 1,309
11/5Sat
multi-stopUnited Airlines
11h 52mONT-SFO
11/5Sat
multi-stopUnited Airlines
14h 05mSFO-ONT
C$ 1,518

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Ontario - San Francisco Flights

Departure:

Ontario (undefined)United States

Destination:

San Francisco (SFO)United States

Return flight deals:

San Francisco - Ontario

Cabin classes:

C$ 133

Browse origins:

  • Flights » 
  • Ontario

Browse destinations:

  • Flights » 
  • San Francisco