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Cheap flights from Ontario to San Francisco from C$ 171

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 20/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
17 Jan — 24 Jan1
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 18 December 2025.

Tue 30/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 22/11:00 p.m.SFO - YYZ
2 stops13h 58mMultiple Airlines
Deal found 16/12C$ 503
Wed 31/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 22/11:00 p.m.SFO - YYZ
2 stops13h 58mMultiple Airlines
Deal found 16/12C$ 507
Tue 30/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Fri 16/11:00 p.m.SFO - YYZ
2 stops13h 58mMultiple Airlines
Deal found 16/12C$ 524
Wed 31/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Fri 16/11:00 p.m.SFO - YYZ
2 stops13h 58mMultiple Airlines
Deal found 16/12C$ 528
Tue 30/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Wed 21/12:08 p.m.SFO - YYZ
2 stops26h 28mMultiple Airlines
Deal found 16/12C$ 529
Wed 31/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Wed 21/12:08 p.m.SFO - YYZ
2 stops26h 28mMultiple Airlines
Deal found 16/12C$ 533
Sat 27/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Thu 22/11:00 p.m.SFO - YYZ
2 stops13h 58mMultiple Airlines
Deal found 16/12C$ 536
Wed 31/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Sun 18/19:11 p.m.SFO - YYZ
2 stops23h 00mMultiple Airlines
Deal found 16/12C$ 541
Tue 30/129:45 a.m.YYZ - SFO
Nonstop5h 55mMultiple Airlines
Mon 19/16:00 p.m.SFO - YYZ
1 stop9h 47mMultiple Airlines
Deal found 16/12C$ 543
Tue 23/122:13 p.m.YUL - SFO
1 stop10h 07mUnited Airlines
Tue 13/19:20 p.m.SFO - YUL
1 stop14h 56mUnited Airlines
Deal found 16/12C$ 744
Wed 24/126:45 a.m.YUL - SFO
1 stop8h 55mPorter Airlines
Tue 30/121:40 p.m.SFO - YUL
1 stop7h 55mPorter Airlines
Deal found 17/12C$ 752
Sat 20/126:45 a.m.YOW - SFO
1 stop8h 55mMultiple Airlines
Wed 7/17:55 p.m.SFO - YOW
2 stops39h 50mMultiple Airlines
Deal found 16/12C$ 765

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 18 December 2025.

Round-trip from

C$ 303

One-way from

C$ 171

Popular in

December

Cheapest in

April

Average price

C$ 661

Good round-trip deal

C$ 578 or less

Good one-way deal

C$ 307 or less
WestJet
  • WestJet
  • 30/1-6/2
  • 2 total stops
  • 17h 52m total
  • Ontario to San Francisco
Search Deals
WestJet
  • WestJet
  • 20/1
  • 1 total stop
  • 9h 27m total
  • Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 629,999 searches. Data last updated 18 December 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

Tue 20/1

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

1 stop9h 27m

San Francisco

Tue 27/1

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

1 stop25h 17m

C$ 304

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Tue 13/1

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

1 stop9h 27m

San Francisco

Tue 20/1

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

1 stop25h 17m

C$ 304

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 22/5

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

1 stop8h 54m

San Francisco

Mon 25/5

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

1 stop8h 50m

C$ 320

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Mon 1/6

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

1 stop8h 54m

San Francisco

Thu 18/6

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

1 stop14h 10m

C$ 339

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Thu 15/1

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

1 stop9h 12m

San Francisco

Thu 22/1

10:15 a.m.-6:21 p.m.

2 stops29h 06m

C$ 342

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Mon 2/2

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

1 stop21h 00m

San Francisco

Thu 5/2

1:00 p.m.-1:21 p.m.

1 stop21h 21m

C$ 342

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 29/5

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

1 stop8h 54m

San Francisco

Tue 2/6

6:05 p.m.-12:40 a.m.

1 stop27h 35m

C$ 358

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Fri 15/5

3:45 p.m.-9:24 p.m.

1 stop8h 39m

San Francisco

Fri 29/5

7:30 a.m.-6:25 p.m.

1 stop7h 55m

C$ 364

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 28/1

6:45 a.m.-12:43 p.m.

1 stop8h 58m

San Francisco

Wed 4/2

1:45 p.m.-12:43 a.m.

1 stop7h 58m

C$ 404

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

10:15 a.m.-5:28 a.m.

2 stops16h 13m

C$ 409

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/12

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$ 198). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of C$ 333). 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 18 December 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.

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 18 December 2025.

The most flights from CAON to SFO are scheduled on a Monday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 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$ 162 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 196 and Air Canada from C$ 215 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 (72%), Porter Airlines (72%), Air Transat( 72%).

  • 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$ 1,739, our data indicates the cheapest price to be C$ 253. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 276.

  • 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$ 198). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of C$ 333). 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
Redwood City
Burlingame
South San Francisco
Scotts Valley
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 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 18 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 200AverageC$ 532FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 241AverageC$ 395FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 256AverageC$ 575FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapestC$ 286AverageC$ 477FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Porter AirlinesCheapestC$ 319AverageC$ 451FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 333AverageC$ 608FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air TransatCheapestC$ 375AverageC$ 531FlexibilityNo 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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