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$142+ 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/39:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Thu 12/1110:15 amSFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 10/29$257
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
Thu 12/119:45 amYYZ - SFO
1 stop13h 18mMultiple Airlines
Sun 12/145:46 pmSFO - YYZ
1 stop10h 01mMultiple Airlines
Deal found 10/30$271
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/39:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Tue 12/910:15 amSFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 10/29$272
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/89:45 amYYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 12/1110:15 amSFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 10/29$275
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Thu 12/49:35 amYYZ - SFO
1 stop13h 28mMultiple Airlines
Mon 12/84:59 pmSFO - YYZ
1 stop10h 21mMultiple Airlines
Deal found 10/29$276
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Tue 12/99:45 amYYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 12/1110:15 amSFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 10/29$277
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Thu 11/279:45 amYYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 12/410:15 amSFO - YYZ
3 stops16h 43mMultiple Airlines
Deal found 10/28$279
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/39:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Mon 12/84:59 pmSFO - YYZ
1 stop10h 21mMultiple Airlines
Deal found 10/29$280
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Thu 12/49:45 amYYZ - SFO
Nonstop5h 55mPorter Airlines
Tue 12/91:40 pmSFO - YYZ
Nonstop4h 59mPorter Airlines
Deal found 10/29$282
This iWofly deal was found by Cheapflights users on 10/29. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/209:45 amYYZ - SFO
Nonstop5h 55mPorter Airlines
Sun 11/301:40 pmSFO - YYZ
Nonstop4h 57mPorter Airlines
Deal found 10/29$283
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Thu 12/46:00 amYOW - SFO
1 stop9h 12mWestJet
Thu 12/111:00 pmSFO - YOW
1 stop8h 40mWestJet
Deal found 10/29$284
This Air Canada deal was found by Cheapflights users on 10/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/63:30 pmYTZ - SFO
1 stop8h 52mAir Canada
Mon 12/88:25 amSFO - YTZ
1 stop8h 30mAir Canada
Deal found 10/29$318

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 October 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$253
(Kiwi.com)

One-way from

$142
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$397

Good round-trip deal

$356 or less

Good one-way deal

$213 or less
Provider with most accurate pricing for Toronto (YTO)-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-San Francisco flights.
Search Deals
From Ontario to San Francisco
Search Deals
One-way flight from Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Ontario to San Francisco.
Search Deals
Price to beat on a one-way flight from Ontario to San Francisco.
Search Deals

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 October 30, 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

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Thu 1/8

6:20 am-12:12 pm

1 stop8h 52m

San Francisco

Sun 1/18

1:00 pm-5:28 am

1 stop13h 28m

$267

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Thu 1/15

6:20 am-12:12 pm

1 stop8h 52m

San Francisco

Sun 1/18

1:00 pm-5:28 am

1 stop13h 28m

$271

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Mon 1/12

6:10 pm-12:12 pm

1 stop21h 02m

San Francisco

Sun 1/18

1:00 pm-5:17 pm

1 stop25h 17m

$308

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Thu 11/27

6:30 am-9:35 am

Nonstop6h 05m

San Francisco

Sun 11/30

11:28 pm-7:30 am

Nonstop5h 02m

$314

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Sun 12/7

9:45 am-12:40 pm

Nonstop5h 55m

San Francisco

Thu 1/22

1:40 pm-9:37 pm

Nonstop4h 57m

$314

TorontoSan Francisco

YTZ - SFO

YTZSFO

Toronto Island

Sat 11/22

3:30 pm-9:22 pm

1 stop8h 52m

San Francisco

Sat 12/6

8:25 am-9:35 pm

1 stop10h 10m

$318

TorontoSan Francisco

YTZ - SFO

YTZSFO

Toronto Island

Tue 12/16

3:30 pm-9:22 pm

1 stop8h 52m

San Francisco

Thu 1/8

8:25 am-9:35 pm

1 stop10h 10m

$318

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Thu 11/20

2:45 pm-9:05 pm

1 stop9h 20m

San Francisco

Thu 11/20

11:28 pm-7:30 am

Nonstop5h 02m

$324

TorontoSan Francisco

YTZ - SFO

YTZSFO

Toronto Island

Tue 12/9

3:30 pm-9:22 pm

1 stop8h 52m

San Francisco

Thu 12/11

8:25 am-9:35 pm

1 stop10h 10m

$328

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Thu 1/8

6:10 pm-12:12 pm

1 stop21h 02m

San Francisco

Sun 1/18

1:00 pm-5:17 pm

1 stop25h 17m

$328

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

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, April is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $144). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of $254). 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 October 30, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 31% on flights from Region of Ontario to San Francisco by exploring options for tickets in the morning.

What is the cheapest day to fly from Region of Ontario to San Francisco?

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Francisco. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Region of Ontario to San Francisco flight should consider departing on Wednesday mornings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 5h 55m. Region of Ontario and San Francisco are separated by a distance of 2253 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 $144. Porter Airlines flights start at $144 while deals on Air Canada start at $178 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 (89%), Air Transat (89%), United Airlines (67%).

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

    Looking at all options, your cheapest flight can be booked for $167. While the most popular route (Toronto Pearson Intl - San Francisco) can be booked for $254 on average, our data indicates $1,216 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, April is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $144). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of $254). 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
South San Francisco
Santa Cruz
Livermore
Turlock
Watsonville
Sunnyvale
Santa Clara
Antioch
Manteca
Vallejo
Hollister
Vacaville
San Bruno
Foster City
Redwood City
Union City
Fairfield
Burlingame
Lodi

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$172Average$308FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$222Average$371FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$241Average$481FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$253Average$403FlexibilityNo cancel feeOn-time52%
American AirlinesCheapest$288Average$426FlexibilityNo cancel feeOn-time71%
DeltaCheapest$308Average$375FlexibilityNo cancel feeOn-timeN/A
Air TransatCheapest$324Average$401FlexibilityNo cancel feeOn-time50%

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