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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 27/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 30 October 2025.

Wed 3/129:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Thu 11/1210:15 a.m.SFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 29/10C$ 359
Thu 11/1212:30 p.m.YYZ - SFO
2 stops12h 33mMultiple Airlines
Sun 14/125:46 p.m.SFO - YYZ
1 stop10h 01mMultiple Airlines
Deal found 30/10C$ 374
Thu 27/119:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 4/1210:15 a.m.SFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 30/10C$ 377
Wed 3/129:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Tue 9/1210:15 a.m.SFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 29/10C$ 380
Thu 4/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 11/1210:15 a.m.SFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 30/10C$ 384
Tue 9/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 11/1210:15 a.m.SFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 29/10C$ 387
Wed 10/129:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Sun 14/125:46 p.m.SFO - YYZ
1 stop9h 34mMultiple Airlines
Deal found 30/10C$ 388
Thu 4/129:35 a.m.YYZ - SFO
1 stop13h 28mMultiple Airlines
Sun 7/125:46 p.m.SFO - YYZ
1 stop9h 34mMultiple Airlines
Deal found 29/10C$ 390
Wed 3/129:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Mon 8/124:59 p.m.SFO - YYZ
1 stop10h 21mMultiple Airlines
Deal found 29/10C$ 391
Sat 6/129:00 p.m.YYZ - SFO
1 stop15h 30mMultiple Airlines
Tue 9/1210:15 a.m.SFO - YYZ
2 stops17h 43mMultiple Airlines
Deal found 30/10C$ 392
Thu 4/126:00 a.m.YOW - SFO
1 stop9h 12mWestJet
Thu 11/121:00 p.m.SFO - YOW
1 stop8h 40mWestJet
Deal found 29/10C$ 397
Sat 6/123:30 p.m.YTZ - SFO
1 stop8h 52mAir Canada
Thu 11/128:25 a.m.SFO - YTZ
1 stop10h 10mAir Canada
Deal found 29/10C$ 444

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 30 October 2025.

Round-trip from

C$ 353

One-way from

C$ 198

Popular in

December

Cheapest in

April

Average price

C$ 554

Good round-trip deal

C$ 502 or less

Good one-way deal

C$ 316 or less
15/1-19/1
  • 15/1-19/1
  • 2 total stops
  • 25h 36m total
  • Ontario to San Francisco
Search Deals
WestJet
  • WestJet
  • 27/1
  • 1 total stop
  • 9h 27m total
  • Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 44 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 October 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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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 30 October 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 2/4

6:20 a.m.-12:10 p.m.

1 stop8h 50m

San Francisco

Sun 19/4

1:00 p.m.-5:29 a.m.

1 stop13h 29m

C$ 371

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Thu 15/1

6:20 a.m.-12:12 p.m.

1 stop8h 52m

San Francisco

Sun 18/1

1:00 p.m.-5:28 a.m.

1 stop13h 28m

C$ 378

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Mon 12/1

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

1 stop21h 02m

San Francisco

Sun 18/1

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

1 stop25h 17m

C$ 430

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Mon 8/12

9:45 a.m.-12:40 p.m.

Nonstop5h 55m

San Francisco

Thu 22/1

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

Nonstop4h 57m

C$ 438

TorontoSan Francisco

YTZ - SFO

YTZSFO

Toronto Island

Sat 22/11

3:30 p.m.-9:22 p.m.

1 stop8h 52m

San Francisco

Sat 6/12

8:25 a.m.-9:35 p.m.

1 stop10h 10m

C$ 444

TorontoSan Francisco

YTZ - SFO

YTZSFO

Toronto Island

Tue 16/12

3:30 p.m.-9:22 p.m.

1 stop8h 52m

San Francisco

Thu 8/1

8:25 a.m.-9:35 p.m.

1 stop10h 10m

C$ 444

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Thu 8/1

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

1 stop21h 02m

San Francisco

Sun 18/1

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

1 stop25h 17m

C$ 458

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Thu 4/12

6:45 a.m.-12:40 p.m.

1 stop8h 55m

San Francisco

Mon 8/12

1:40 p.m.-12:41 a.m.

1 stop8h 01m

C$ 465

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Tue 24/3

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

1 stop9h 10m

San Francisco

Tue 31/3

1:00 p.m.-12:39 a.m.

2 stops32h 39m

C$ 465

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Tue 9/12

9:45 a.m.-12:40 p.m.

Nonstop5h 55m

San Francisco

Mon 15/12

1:40 p.m.-9:39 p.m.

Nonstop4h 59m

C$ 469

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

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 C$ 201). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of C$ 355). 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 30 October 2025.

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 27% 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 16 December 2024.

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. Sunday afternoons 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 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$ 201 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 201 and Air Canada from C$ 249 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 (89%), Air Transat (89%), United Airlines( 67%).

  • 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$ 1,980, our data indicates the cheapest price to be C$ 218. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 355.

  • 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 C$ 201). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of C$ 355). 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
Novato
Santa Clara
Vallejo

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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 30 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 203AverageC$ 553FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 242AverageC$ 547FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
WestJetCheapestC$ 245AverageC$ 401FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 302AverageC$ 484FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Porter AirlinesCheapestC$ 329AverageC$ 457FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 337AverageC$ 609FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air TransatCheapestC$ 408AverageC$ 523FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Alaska AirlinesCheapestC$ 427AverageC$ 671FlexibilityNo cancel feeOn-time75%
Search Alaska 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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