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Cheap flights from Ontario to San Francisco from C$ 224

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 26/5. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
23 May — 30 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to San Francisco

Enter your travel dates to find the best prices.

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 23 April 2026.

Thu 8/105:40 a.m.
YXU
-
SFO
1 stop7h 59m
Air Canada
Tue 13/1011:35 a.m.
SFO
-
YXU
1 stop7h 05m
Air Canada
Deal found 22/4C$ 350
Thu 13/82:50 p.m.
YYZ
-
SFO
1 stop10h 05m
WestJet
Thu 20/86:00 a.m.
SFO
-
YYZ
2 stops10h 55m
WestJet
Deal found 20/4C$ 392
Thu 10/96:15 a.m.
YYZ
-
SFO
1 stop8h 45m
WestJet
Sat 12/91:00 p.m.
SFO
-
YYZ
1 stop8h 10m
WestJet
Deal found 19/4C$ 393
Thu 9/76:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Wed 29/76:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 19/4C$ 393
Wed 19/812:40 p.m.
YYZ
-
SFO
2 stops12h 15m
WestJet
Wed 26/86:00 a.m.
SFO
-
YYZ
2 stops12h 35m
WestJet
Deal found 19/4C$ 395
Wed 1/712:25 p.m.
YOW
-
SFO
2 stops12h 30m
WestJet
Sun 5/76:05 p.m.
SFO
-
YOW
1 stop8h 30m
WestJet
Deal found 19/4C$ 396
Fri 28/810:50 a.m.
YYZ
-
SFO
1 stop8h 50m
WestJet
Wed 9/96:05 p.m.
SFO
-
YYZ
1 stop9h 50m
WestJet
Deal found 21/4C$ 396
Thu 3/93:50 p.m.
YYZ
-
SFO
1 stop9h 05m
WestJet
Wed 9/96:05 p.m.
SFO
-
YYZ
1 stop8h 40m
WestJet
Deal found 19/4C$ 397
Tue 30/66:00 a.m.
YOW
-
SFO
1 stop9h 00m
WestJet
Mon 13/76:00 a.m.
SFO
-
YOW
1 stop8h 15m
WestJet
Deal found 19/4C$ 399
Wed 19/89:00 a.m.
YYZ
-
SFO
1 stop10h 40m
WestJet
Thu 27/81:00 p.m.
SFO
-
YYZ
1 stop8h 10m
WestJet
Deal found 19/4C$ 399
Fri 11/96:10 p.m.
YHM
-
SFO
1 stop20h 50m
WestJet
Mon 14/96:00 a.m.
SFO
-
YHM
1 stop8h 15m
WestJet
Deal found 19/4C$ 400
Wed 22/712:40 p.m.
YYZ
-
SFO
2 stops12h 15m
WestJet
Mon 3/86:00 a.m.
SFO
-
YYZ
2 stops10h 55m
WestJet
Deal found 18/4C$ 400

Find 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 23 April 2026.

Round-trip from

C$ 350

One-way from

C$ 224

Popular in

December

Cheapest in

November

Average price

C$ 535

Good round-trip deal

C$ 558 or less

Good one-way deal

C$ 334 or less
Air Canada
  • Air Canada
  • 8/10-13/10
  • 2 total stops
  • 15h 04m total
  • Ontario to San Francisco
Search Deals
WestJet
  • WestJet
  • 26/5
  • 1 total stop
  • 8h 50m total
  • Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 10 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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 629,999 searches. Data last updated 23 April 2026.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 8/10

5:40 a.m.-10:39 a.m.

1 stop7h 59m

San Francisco

Tue 13/10

11:35 a.m.-9:40 p.m.

1 stop7h 05m

C$ 350

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 11/9

6:10 p.m.-12:00 p.m.

1 stop20h 50m

San Francisco

Mon 14/9

6:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 400

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Tue 8/9

6:10 p.m.-12:00 p.m.

1 stop20h 50m

San Francisco

Mon 14/9

6:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 408

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Fri 11/9

8:40 p.m.-9:55 p.m.

1 stop28h 15m

San Francisco

Mon 14/9

6:00 a.m.-7:50 p.m.

1 stop10h 50m

C$ 417

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 25/9

6:10 p.m.-12:00 p.m.

1 stop20h 50m

San Francisco

Wed 30/9

6:00 a.m.-5:15 p.m.

1 stop8h 15m

C$ 417

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Tue 8/9

8:40 p.m.-12:00 p.m.

1 stop18h 20m

San Francisco

Mon 14/9

6:00 a.m.-7:50 p.m.

1 stop10h 50m

C$ 426

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Fri 28/8

11:00 a.m.-9:10 p.m.

1 stop13h 10m

San Francisco

Fri 28/8

11:30 p.m.-3:46 p.m.

1 stop13h 16m

C$ 434

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Fri 25/9

8:40 p.m.-12:00 p.m.

1 stop18h 20m

San Francisco

Wed 30/9

6:00 a.m.-7:50 p.m.

1 stop10h 50m

C$ 434

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Wed 15/7

8:40 p.m.-12:00 p.m.

1 stop18h 20m

San Francisco

Wed 22/7

6:00 a.m.-7:50 p.m.

1 stop10h 50m

C$ 445

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Mon 13/7

8:40 p.m.-12:00 p.m.

1 stop18h 20m

San Francisco

Mon 20/7

6:00 a.m.-7:50 p.m.

1 stop10h 50m

C$ 453

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/4

Showing 1-10 of 60 resultsSorted by cheapest first
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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, May is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of C$ 458). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of C$ 589). 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 23 April 2026.

One of the essential ways to save on airfare from Region of Ontario to San Francisco is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 50% on airfare.

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 18 April 2026.

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

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 23 April 2026.

The most flights from CAON to SFO are scheduled on a Thursday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 on average).

How much does it cost to fly round-trip from Region of Ontario to San Francisco?

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?

    Located just 17.7 km from the city centre, San Francisco (SFO) is the airport most travelers will use when flying to San Francisco from Ontario.

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

    Departing from Region of Ontario to San Francisco will take you 7h 59m. Region of Ontario and San Francisco are separated by a distance of 3508 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    One-way options have recently been found by users for as low as C$ 166 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 207 and Air Transat from C$ 222 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?

    Before booking your flight to San Francisco from Region of Ontario, check out the most reliable airlines to get you to your destination on time: American Airlines (60%), Porter Airlines (60%), Air Transat( 60%).

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

    Looking for the cheapest flight from Region of Ontario to San Francisco? While on average our users pay C$ 1,466, our data indicates the cheapest price to be C$ 281. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 382.

  • 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, May is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of C$ 458). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of C$ 589). 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

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Burlingame
San Bruno
Roseville
Livermore
South San Francisco
Novato
Santa Clara
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Ontario to San Francisco

Discover the top 8 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 629,999 searches. Data last updated 23 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Flair AirlinesCheapestC$ 115AverageC$ 467FlexibilityNo cancel feeOn-timeN/A
Search Flair Airlines flights
Air CanadaCheapestC$ 198AverageC$ 582FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 218AverageC$ 407FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 256AverageC$ 473FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapestC$ 275AverageC$ 656FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Porter AirlinesCheapestC$ 308AverageC$ 520FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air TransatCheapestC$ 375AverageC$ 575FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
United AirlinesCheapestC$ 435AverageC$ 597FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to San Francisco?

Cheapflights helps you search for flights from Ontario to San Francisco via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Ontario to San Francisco?

Cheapflights helps you find that perfect flight to San Francisco from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ontario to San Francisco with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to San Francisco, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Ontario to San Francisco become cheaper?

Yes! Start tracking prices for Ontario to San Francisco flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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