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Cheap flights from Ontario to San Francisco from C$ 256

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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
24 Aug — 31 Aug1
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 25 July 2026.

Sat 5/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Sat 12/91:00 p.m.
SFO
-
YXU
1 stop13h 20m
WestJet
Deal found 22/7C$ 432
Thu 8/106:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Tue 13/106:00 a.m.
SFO
-
YXU
1 stop20h 20m
WestJet
Deal found 23/7C$ 437
Wed 14/1010:50 a.m.
YYZ
-
SFO
1 stop8h 50m
Multiple Airlines
Tue 20/101:20 p.m.
SFO
-
YYZ
Nonstop5h 05m
Multiple Airlines
Deal found 25/7C$ 448
Tue 1/93:50 p.m.
YYZ
-
SFO
1 stop9h 05m
Multiple Airlines
Thu 10/91:20 p.m.
SFO
-
YYZ
Nonstop5h 05m
Multiple Airlines
Deal found 24/7C$ 449
Thu 10/99:45 a.m.
YYZ
-
SFO
Nonstop5h 35m
Multiple Airlines
Mon 21/91:00 p.m.
SFO
-
YYZ
1 stop8h 10m
Multiple Airlines
Deal found 23/7C$ 451
Fri 11/99:45 a.m.
YYZ
-
SFO
Nonstop5h 35m
Porter Airlines
Mon 14/91:20 p.m.
SFO
-
YYZ
Nonstop5h 05m
Porter Airlines
Deal found 23/7C$ 452
Thu 10/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Mon 14/96:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 22/7C$ 452
Sun 13/96:00 a.m.
YYZ
-
SFO
1 stop9h 00m
WestJet
Tue 22/96:00 a.m.
SFO
-
YYZ
2 stops10h 55m
WestJet
Deal found 23/7C$ 454
Fri 30/109:50 a.m.
YYZ
-
SFO
Nonstop5h 55m
Air Transat
Thu 5/111:45 p.m.
SFO
-
YYZ
Nonstop4h 54m
Air Transat
Deal found 25/7C$ 455
Sun 6/93:50 p.m.
YYZ
-
SFO
1 stop9h 05m
WestJet
Tue 8/91:00 p.m.
SFO
-
YYZ
2 stops13h 10m
WestJet
Deal found 22/7C$ 456
Tue 8/910:20 p.m.
YYZ
-
SFO
2 stops16h 40m
WestJet
Mon 14/91:00 p.m.
SFO
-
YYZ
2 stops13h 10m
WestJet
Deal found 22/7C$ 458
Wed 9/96:00 a.m.
YYZ
-
SFO
1 stop9h 00m
WestJet
Sat 12/91:00 p.m.
SFO
-
YYZ
1 stop8h 10m
WestJet
Deal found 22/7C$ 459

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 25 July 2026.

Round-trip from

C$ 432

One-way from

C$ 256

Popular in

July

Cheapest in

November

Average price

C$ 728

Good round-trip deal

C$ 652 or less

Good one-way deal

C$ 380 or less
WestJet
  • WestJet
  • 5/9-12/9
  • 2 total stops
  • 22h 10m total
  • Ontario to San Francisco
Search Deals
WestJet
  • WestJet
  • 6/9
  • 1 total stop
  • 8h 50m total
  • Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 101 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 25 July 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

Sat 5/9

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

1 stop8h 50m

San Francisco

Sat 12/9

1:00 p.m.-5:20 a.m.

1 stop13h 20m

C$ 432

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 10/9

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

1 stop8h 50m

San Francisco

Mon 14/9

6:00 a.m.-4:45 p.m.

1 stop7h 45m

C$ 454

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Wed 14/10

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

1 stop28h 15m

San Francisco

Sun 18/10

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

1 stop10h 50m

C$ 461

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 10/9

3:30 p.m.-8:59 p.m.

1 stop8h 29m

San Francisco

Mon 14/9

6:40 a.m.-9:40 p.m.

2 stops12h 00m

C$ 475

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Wed 23/9

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

1 stop18h 20m

San Francisco

Sun 27/9

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

1 stop10h 50m

C$ 513

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Tue 8/9

8:15 p.m.-9:55 p.m.

1 stop28h 40m

San Francisco

Tue 15/9

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

1 stop8h 15m

C$ 528

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 8/9

3:30 p.m.-11:17 a.m.

2 stops22h 47m

San Francisco

Tue 15/9

4:30 p.m.-9:20 a.m.

2 stops13h 50m

C$ 537

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Fri 11/9

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

1 stop18h 20m

San Francisco

Sun 20/9

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

1 stop10h 50m

C$ 546

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Tue 8/12

6:08 p.m.-10:39 p.m.

1 stop7h 31m

San Francisco

Sat 9/1

9:00 p.m.-11:14 a.m.

1 stop11h 14m

C$ 552

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Mon 17/8

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

1 stop18h 20m

San Francisco

Mon 24/8

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

1 stop10h 50m

C$ 556

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/7

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, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of C$ 503). Flying from Region of Ontario to San Francisco in July is currently the most expensive (average of C$ 673). 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 25 July 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 at noon tend to be the most expensive. A flight in the morning could potentially save you up to 70% on airfare.

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 25 July 2026.

The most flights from CAON to SFO are scheduled on a Monday (23 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 on average).

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

Airfare is below average for this route at the moment.
Region of Ontario to San Francisco flights typically cost between C$ 547 and C$ 822 in October.
The cheapest round-trip price found within the last 5 days was C$ 448 on Multiple Airlines (14 Oct-20 Oct).

How far ahead should I book a flight from Region of Ontario to San Francisco?

The best time to book flights from Region of Ontario to San Francisco is 79 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 25 July 2026.

Travelers seeking maximum savings on their Region of Ontario to San Francisco flight should consider departing on Wednesday at noon when fares are most often at their lowest. Sunday 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?

    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 31m. Region of Ontario and San Francisco are separated by a distance of 3626 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$ 165 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 215 and Air Transat from C$ 229 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: Singapore Airlines (73%), American Airlines (69%), Porter Airlines( 69%).

  • 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$ 2,288, our data indicates the cheapest price to be C$ 250. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 376.

  • 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 C$ 503). Flying from Region of Ontario to San Francisco in July is currently the most expensive (average of C$ 673). 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
Santa Clara
Burlingame
San Bruno
Roseville
Livermore
South San Francisco
Novato
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 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 629,999 searches. Data last updated 25 July 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 224AverageC$ 458FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 260AverageC$ 739FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
DeltaCheapestC$ 290AverageC$ 560FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Porter AirlinesCheapestC$ 319AverageC$ 547FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 355AverageC$ 707FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air TransatCheapestC$ 387AverageC$ 603FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
United AirlinesCheapestC$ 469AverageC$ 633FlexibilityNo 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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