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Cheap flights from Ontario to San Francisco from C$ 198

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
15 Oct — 22 Oct1
1 adult
1 adult, Economy

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 15 September 2025.

Round-trip from

C$ 337

One-way from

C$ 198

Popular in

December

Cheapest in

April

Average price

C$ 569

Good round-trip deal

C$ 618 or less

Good one-way deal

C$ 385 or less
WestJet
  • WestJet
  • 6/10-12/10
  • 2 total stops
  • 17h 44m total
  • Ontario to San Francisco
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WestJet
  • WestJet
  • 12/12
  • 1 total stop
  • 9h 12m total
  • Ontario to San Francisco
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Highest demand for flights based on searches. 6% potential increase in price (C$ 46 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 20 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 15 September 2025.

Mon 6/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Sat 11/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 15/9C$ 334
Mon 6/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Sun 12/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 15/9C$ 336
Tue 7/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Thu 9/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 14/9C$ 347
Mon 6/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Thu 9/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 15/9C$ 348
Wed 15/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Wed 22/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 15/9C$ 351
Wed 1/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Wed 8/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 14/9C$ 358
Tue 30/96:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Wed 1/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 15/9C$ 362
Tue 30/96:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Tue 7/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 14/9C$ 369
Mon 6/106:00 a.m.YHM - SFO
2 stops30h 30mMultiple Airlines
Sat 11/1012:50 p.m.SFO - YHM
1 stop8h 50mMultiple Airlines
Deal found 15/9C$ 374
Tue 30/99:30 a.m.YYZ - SFO
1 stop14h 51mMultiple Airlines
Sun 12/1010:15 a.m.SFO - YYZ
1 stop11h 28mMultiple Airlines
Deal found 15/9C$ 374
Fri 24/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Tue 28/101:00 p.m.SFO - YHM
1 stop25h 17mWestJet
Deal found 14/9C$ 376
Thu 23/1012:00 p.m.YYZ - SFO
2 stops12h 24mMultiple Airlines
Mon 27/101:40 p.m.SFO - YYZ
Nonstop4h 57mMultiple Airlines
Deal found 15/9C$ 376

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 15 September 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

Wed 15/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

San Francisco

Wed 22/10

12:50 p.m.-12:40 a.m.

1 stop8h 50m

C$ 351

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Wed 1/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

San Francisco

Wed 8/10

12:50 p.m.-12:40 a.m.

1 stop8h 50m

C$ 358

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Tue 13/1

5:45 a.m.-12:12 p.m.

1 stop9h 27m

San Francisco

Tue 10/2

1:00 p.m.-5:16 p.m.

1 stop25h 16m

C$ 363

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 24/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

San Francisco

Tue 28/10

1:00 p.m.-5:17 p.m.

1 stop25h 17m

C$ 376

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Tue 14/10

10:25 p.m.-11:54 a.m.

1 stop16h 29m

San Francisco

Tue 21/10

7:30 a.m.-6:52 p.m.

1 stop8h 22m

C$ 380

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Wed 1/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

San Francisco

Sun 5/10

7:30 a.m.-12:40 a.m.

1 stop14h 10m

C$ 396

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Fri 24/10

9:45 a.m.-9:29 a.m.

1 stop26h 44m

San Francisco

Mon 27/10

1:40 p.m.-9:37 p.m.

Nonstop4h 57m

C$ 402

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Fri 6/3

3:11 p.m.-11:14 p.m.

1 stop11h 03m

San Francisco

Sat 14/3

5:15 a.m.-9:18 p.m.

2 stops13h 03m

C$ 405

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 19/11

11:10 a.m.-7:07 p.m.

1 stop10h 57m

San Francisco

Sun 23/11

7:10 p.m.-3:23 p.m.

2 stops17h 13m

C$ 405

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Thu 30/10

7:30 p.m.-1:15 a.m.

1 stop8h 45m

San Francisco

Thu 13/11

7:10 p.m.-3:23 p.m.

2 stops17h 13m

C$ 405

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/9

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 C$ 276). Flying from Region of Ontario to San Francisco in December is currently the most expensive (average of C$ 368). 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 15 September 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 15 September 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?

    Located just 19.0 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 5h 55m. 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$ 209 on WestJet. Other airlines that offer cheap prices include United Airlines from C$ 235 and Air Canada from C$ 240 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: Porter Airlines (82%), Air Transat (82%), Singapore Airlines( 61%).

  • 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$ 1,321, our data indicates the cheapest price to be C$ 250. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 296.

  • 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$ 276). Flying from Region of Ontario to San Francisco in December is currently the most expensive (average of C$ 368). 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
Richmond
Newark
Alameda
Redwood City
Burlingame
San Bruno
South San Francisco
Scotts Valley
Belmont
Novato
Millbrae
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 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 242AverageC$ 398FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 257AverageC$ 573FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapestC$ 299AverageC$ 479FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 305AverageC$ 581FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 334AverageC$ 570FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 338AverageC$ 462FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Alaska AirlinesCheapestC$ 422AverageC$ 603FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air TransatCheapestC$ 425AverageC$ 512FlexibilityNo cancel feeOn-time50%
Search Air Transat 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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