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$143+ Cheap flights from Ontario to San Francisco (SFO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Ontario to San Francisco

Keep the following information in mind while searching for Ontario to San Francisco flight deals. Data was last updated September 15, 2025.

Round-trip from

$244
(FlightHub)

One-way from

$143
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$412

Good round-trip deal

$406 or less

Good one-way deal

$209 or less
From Ontario to San Francisco
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One-way flight from Ontario to San Francisco
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Highest demand for flights based on searches. 6% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to San Francisco.
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Price to beat on a one-way flight from Ontario to San Francisco.
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Find flight deals from Ontario to San Francisco

Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/66:00 amYHM - SFO
1 stop8h 54mWestJet
Sun 10/1212:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/14$244
This Trip.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/76:00 amYHM - SFO
1 stop8h 54mWestJet
Thu 10/912:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/14$251
This Trip.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:00 amYHM - SFO
1 stop8h 54mWestJet
Tue 10/2112:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/15$254
This Trip.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:00 amYHM - SFO
1 stop8h 54mWestJet
Fri 10/2412:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/13$255
This FlightHub deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/66:00 amYHM - SFO
1 stop8h 54mWestJet
Thu 10/912:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/13$256
This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:00 amYHM - SFO
1 stop8h 54mWestJet
Wed 10/812:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/14$259
This Trip.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:00 amYHM - SFO
1 stop8h 54mWestJet
Thu 10/212:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/13$261
This Trip.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/306:00 amYHM - SFO
1 stop8h 54mWestJet
Wed 10/112:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/15$262
This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/306:00 amYHM - SFO
1 stop8h 54mWestJet
Tue 10/712:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 9/14$267
This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:00 amYHM - SFO
1 stop8h 54mWestJet
Tue 10/281:00 pmSFO - YHM
1 stop25h 17mWestJet
Deal found 9/14$272
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/222:55 pmYHM - SFO
2 stops21h 35mMultiple Airlines
Sat 10/2510:15 amSFO - YHM
1 stop10h 44mMultiple Airlines
Deal found 9/13$275
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/69:45 amYYZ - SFO
Nonstop5h 38mMultiple Airlines
Sun 10/1210:15 amSFO - YYZ
1 stop11h 28mMultiple Airlines
Deal found 9/14$275

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.

Fly from

Ontario

Fly to

San Francisco

Route

Depart

Return

Price

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Mon 10/6

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Sun 10/12

12:50 pm-12:40 am

1 stop8h 50m

$244

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Tue 10/7

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Thu 10/9

12:50 pm-12:40 am

1 stop8h 50m

$251

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Wed 10/1

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Wed 10/8

12:50 pm-12:40 am

1 stop8h 50m

$259

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Wed 10/15

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Wed 10/22

12:50 pm-12:40 am

1 stop8h 50m

$262

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 10/24

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Tue 10/28

1:00 pm-5:17 pm

1 stop25h 17m

$272

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Mon 10/20

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Fri 10/24

12:50 pm-12:45 am

1 stop8h 55m

$284

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Fri 10/17

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Thu 10/23

12:50 pm-12:45 am

1 stop8h 55m

$284

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Fri 3/6

3:11 pm-11:14 pm

1 stop11h 03m

San Francisco

Sat 3/14

5:15 am-9:18 pm

2 stops13h 03m

$293

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 11/19

11:10 am-7:07 pm

1 stop10h 57m

San Francisco

Sun 11/23

7:10 pm-3:23 pm

2 stops17h 13m

$293

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Thu 10/30

7:30 pm-1:15 am

1 stop8h 45m

San Francisco

Thu 11/13

7:10 pm-3:23 pm

2 stops17h 13m

$293

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to San Francisco

What is the cheapest month to book a flight from Region of Ontario to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of $357). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ON to SFO?

Find hourly flight availability from Ontario to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to San Francisco as you normally would.

Weekly flight availability from Region of Ontario to San Francisco

Explore weekly flight availability from Ontario to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 15, 2025.

The most flights from CAON to SFO are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 on average).

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to San Francisco from Ontario?

    If you book a flight to San Francisco from Ontario, you will be flying to San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.8 mi from the center of San Francisco.

  • How long is the flight from Region of Ontario to San Francisco?

    Departing from Region of Ontario to San Francisco will take you 8h 52m. Region of Ontario and San Francisco are separated by a distance of 2264 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Region of Ontario to San Francisco one-way?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at $147. United Airlines flights start at $170 while deals on Air Canada start at $174 one-way.

  • What are the most popular routes from Region of Ontario to San Francisco?

    While some choose either Montreal Pierre Elliott Trudeau Intl - San Francisco or Toronto Island - San Francisco, Toronto Pearson Intl - San Francisco is the most popular route from Region of Ontario to San Francisco.

  • What are the most reliable airlines from Region of Ontario to San Francisco?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Region of Ontario to San Francisco on time: Porter Airlines (82%), Air Transat (82%), Singapore Airlines (61%).

  • What are the cheapest flights from Region of Ontario to San Francisco?

    Looking at all options, your cheapest flight can be booked for $172. While the most popular route (Toronto Pearson Intl - San Francisco) can be booked for $214 on average, our data indicates $841 when flying from Region of Ontario to San Francisco.

  • Can I find deals for flights from Ontario to San Francisco that include hotel bookings?

    Yes. In addition to deals on Ontario to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Francisco.

  • Can I find deals for business class flights from Ontario to San Francisco?

    Yes. Cheapflights offers flight deals from Ontario to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Region of Ontario to San Francisco?

    Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of $357). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Santa Cruz
Livermore
South San Francisco
Turlock
Antioch
Watsonville
Santa Clara
Manteca
Sunnyvale
Hollister
Vacaville
Foster City
Union City
Vallejo
Burlingame
Redwood City
San Mateo
San Leandro
Lathrop

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to San Francisco

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Top 7 airlines flying from Ontario to San Francisco

Discover the top 7 airlines that operate flights from Ontario to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$172Average$309FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$222Average$391FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$241Average$498FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$257Average$424FlexibilityNo cancel feeOn-time52%
Air TransatCheapest$287Average$393FlexibilityNo cancel feeOn-time50%
American AirlinesCheapest$288Average$426FlexibilityNo cancel feeOn-time71%
DeltaCheapest$308Average$387FlexibilityNo cancel feeOn-timeN/A

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