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Cheap flights from Ontario to San Francisco from C$ 218

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
3 Aug — 10 Aug1
1 adult

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 29 July 2025.

Round-trip from

C$ 351

One-way from

C$ 218

Popular in

December

Cheapest in

April

Average price

C$ 609

Good round-trip deal

C$ 822 or less

Good one-way deal

C$ 486 or less
WestJet
  • WestJet
  • 28/8-6/9
  • 2 total stops
  • 17h 33m total
  • Ontario to San Francisco
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WestJet
  • WestJet
  • 23/8
  • 1 total stop
  • 11h 14m total
  • Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 42 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 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 29 July 2025.

Thu 28/86:00 a.m.YXU - SFO
1 stop8h 56mWestJet
Sat 6/97:30 a.m.SFO - YXU
1 stop8h 37mWestJet
Deal found 27/7C$ 351
Thu 4/96:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Wed 10/912:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 29/7C$ 369
Wed 17/99:45 a.m.YYZ - SFO
1 stop14h 36mMultiple Airlines
Wed 24/910:15 a.m.SFO - YYZ
1 stop9h 38mMultiple Airlines
Deal found 29/7C$ 381
Thu 21/86:00 a.m.YKF - SFO
1 stop8h 56mWestJet
Tue 26/87:30 a.m.SFO - YKF
1 stop8h 26mWestJet
Deal found 27/7C$ 387
Thu 9/1012:00 p.m.YYZ - SFO
2 stops12h 24mWestJet
Sun 12/107:30 a.m.SFO - YYZ
2 stops14h 01mWestJet
Deal found 27/7C$ 387
Wed 3/95:45 p.m.YHM - SFO
1 stop18h 45mMultiple Airlines
Tue 9/910:15 a.m.SFO - YHM
1 stop10h 44mMultiple Airlines
Deal found 28/7C$ 395
Sat 11/106:00 a.m.YOW - SFO
1 stop8h 54mWestJet
Mon 20/1012:50 p.m.SFO - YOW
2 stops24h 29mWestJet
Deal found 27/7C$ 401
Fri 19/912:20 p.m.YOW - SFO
2 stops12h 04mMultiple Airlines
Thu 25/910:15 a.m.SFO - YOW
2 stops17h 30mMultiple Airlines
Deal found 27/7C$ 402
Wed 10/93:50 p.m.YXU - SFO
1 stop8h 03mAir Canada
Tue 23/94:35 p.m.SFO - YXU
2 stops13h 44mAir Canada
Deal found 26/7C$ 424
Thu 23/1012:25 p.m.YTZ - SFO
1 stop10h 26mAir Canada
Mon 27/108:25 a.m.SFO - YTZ
1 stop8h 30mAir Canada
Deal found 29/7C$ 428
Mon 25/86:30 p.m.YUL - SFO
Nonstop6h 10mUnited Airlines
Mon 1/911:45 p.m.SFO - YUL
Nonstop5h 31mUnited Airlines
Deal found 28/7C$ 435
Tue 26/81:10 p.m.YUL - SFO
1 stop10h 43mAir Canada
Wed 3/911:35 a.m.SFO - YUL
1 stop10h 01mAir Canada
Deal found 29/7C$ 436

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 29 July 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

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 28/8

6:00 a.m.-11:56 a.m.

1 stop8h 56m

San Francisco

Sat 6/9

7:30 a.m.-7:07 p.m.

1 stop8h 37m

C$ 351

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Wed 17/9

9:45 a.m.-9:21 p.m.

1 stop14h 36m

San Francisco

Wed 24/9

10:15 a.m.-10:53 p.m.

1 stop9h 38m

C$ 381

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Thu 21/8

6:00 a.m.-11:56 a.m.

1 stop8h 56m

San Francisco

Tue 26/8

7:30 a.m.-6:56 p.m.

1 stop8h 26m

C$ 387

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 12/9

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

1 stop8h 54m

San Francisco

Fri 19/9

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

1 stop8h 50m

C$ 387

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Thu 9/10

12:00 p.m.-9:24 p.m.

2 stops12h 24m

San Francisco

Sun 12/10

7:30 a.m.-12:31 a.m.

2 stops14h 01m

C$ 387

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Wed 3/9

5:45 p.m.-9:30 a.m.

1 stop18h 45m

San Francisco

Tue 9/9

10:15 a.m.-11:59 p.m.

1 stop10h 44m

C$ 395

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Sat 11/10

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

1 stop8h 54m

San Francisco

Mon 20/10

12:50 p.m.-4:19 p.m.

2 stops24h 29m

C$ 401

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Fri 19/9

12:20 p.m.-9:24 p.m.

2 stops12h 04m

San Francisco

Thu 25/9

10:15 a.m.-6:45 a.m.

2 stops17h 30m

C$ 402

LondonSan Francisco

YXU - SFO

YXUSFO

London

Wed 10/9

3:50 p.m.-8:53 p.m.

1 stop8h 03m

San Francisco

Tue 23/9

4:35 p.m.-9:19 a.m.

2 stops13h 44m

C$ 424

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Mon 25/8

6:30 p.m.-9:40 p.m.

Nonstop6h 10m

San Francisco

Mon 1/9

11:45 p.m.-8:16 a.m.

Nonstop5h 31m

C$ 435

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Showing 1-10 of 57 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 29 July 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 29 July 2025.

The most flights from CAON to SFO are scheduled on a Monday (18 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated 29 July 2025.
Check out reviews from past customers who have flown with Alaska Airlines,Porter Airlines, andDelta from Ontario to San Francisco to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Porter Airlines
8.0
Very good
317 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Air Transat
7.7
Good
424 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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$ 218 on WestJet. Other airlines that offer cheap prices include Air Canada from C$ 240 and Porter Airlines from C$ 246 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 Hamilton - 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 (79%), Porter Airlines (79%), Air Transat( 79%).

  • 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$ 2,329, our data indicates the cheapest price to be C$ 269. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 336.

  • 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
Novato
Belmont
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 29 July 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 255AverageC$ 569FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
WestJetCheapestC$ 284AverageC$ 395FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 326AverageC$ 475FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 327AverageC$ 592FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 331AverageC$ 610FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 339AverageC$ 469FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Alaska AirlinesCheapestC$ 419AverageC$ 642FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air TransatCheapestC$ 426AverageC$ 509FlexibilityNo 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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