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$159+ Cheap flights from Ontario to San Francisco (SFO)

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 8/28. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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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 July 30, 2025.

Round-trip from

$269
(Mytrip)

One-way from

$159
(SmartFares)

Popular in

December

Cheapest in

April

Average price

$444

Good round-trip deal

$399 or less

Good one-way deal

$239 or less
From Ontario to San Francisco
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One-way flight from Ontario to San Francisco
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Highest demand for flights based on searches. 5% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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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 July 30, 2025.

This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:00 amYHM - SFO
1 stop8h 54mWestJet
Wed 9/1012:50 pmSFO - YHM
1 stop8h 50mWestJet
Deal found 7/29$269
This CheapOair deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/149:00 amYYZ - SFO
1 stop11h 14mWestJet
Mon 9/2212:50 pmSFO - YYZ
1 stop8h 32mWestJet
Deal found 7/29$278
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/38:05 pmYYZ - SFO
1 stop15h 33mMultiple Airlines
Sun 10/1210:15 amSFO - YYZ
1 stop9h 38mMultiple Airlines
Deal found 7/28$279
This FlightHub deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/319:45 amYYZ - SFO
Nonstop5h 55mPorter Airlines
Mon 11/31:40 pmSFO - YYZ
Nonstop4h 57mPorter Airlines
Deal found 7/29$283
This Mytrip deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/286:00 amYKF - SFO
1 stop8h 56mWestJet
Fri 9/512:50 pmSFO - YKF
1 stop8h 55mWestJet
Deal found 7/28$285
This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:00 amYXU - SFO
1 stop8h 54mWestJet
Tue 9/237:30 amSFO - YXU
1 stop8h 37mWestJet
Deal found 7/29$286
This Booking.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1312:25 pmYTZ - SFO
1 stop10h 26mAir Canada
Sat 9/208:30 amSFO - YTZ
1 stop10h 04mAir Canada
Deal found 7/29$290
This Agoda.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Agoda.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/162:40 pmYOW - SFO
1 stop8h 11mAir Canada
Tue 9/237:10 amSFO - YOW
1 stop10h 43mAir Canada
Deal found 7/29$291
This KAYAK deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:00 amYOW - SFO
1 stop8h 23mPorter Airlines
Sun 10/51:25 pmSFO - YOW
1 stop7h 56mPorter Airlines
Deal found 7/30$293
This Trip.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/236:00 amYHM - SFO
1 stop8h 56mMultiple Airlines
Tue 9/2310:15 amSFO - YHM
1 stop10h 44mMultiple Airlines
Deal found 7/30$297
This Air Canada deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/48:05 amYYZ - SFO
Nonstop5h 28mAir Canada
Sun 9/148:40 amSFO - YYZ
Nonstop4h 55mAir Canada
Deal found 7/29$298
This Trip.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:00 amYXU - SFO
1 stop8h 54mMultiple Airlines
Tue 9/2310:15 amSFO - YXU
3 stops15h 57mMultiple Airlines
Deal found 7/29$303

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 2,558,603 searches. Data last updated July 30, 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

Thu 9/4

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Wed 9/10

12:50 pm-12:40 am

1 stop8h 50m

$269

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Sun 9/14

9:00 am-5:14 pm

1 stop11h 14m

San Francisco

Mon 9/22

12:50 pm-12:22 am

1 stop8h 32m

$278

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Fri 10/3

8:05 pm-8:38 am

1 stop15h 33m

San Francisco

Sun 10/12

10:15 am-10:53 pm

1 stop9h 38m

$279

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Wed 10/1

9:45 am-12:23 pm

Nonstop5h 38m

San Francisco

Sat 10/4

1:25 pm-9:24 pm

Nonstop4h 59m

$284

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Thu 8/28

6:00 am-11:56 am

1 stop8h 56m

San Francisco

Fri 9/5

12:50 pm-12:45 am

1 stop8h 55m

$285

LondonSan Francisco

YXU - SFO

YXUSFO

London

Wed 9/10

6:00 am-11:54 am

1 stop8h 54m

San Francisco

Tue 9/23

7:30 am-7:07 pm

1 stop8h 37m

$286

TorontoSan Francisco

YTZ - SFO

YTZSFO

Toronto Island

Sat 9/13

12:25 pm-7:51 pm

1 stop10h 26m

San Francisco

Sat 9/20

8:30 am-9:34 pm

1 stop10h 04m

$290

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Tue 9/16

2:40 pm-7:51 pm

1 stop8h 11m

San Francisco

Tue 9/23

7:10 am-8:53 pm

1 stop10h 43m

$291

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 10/1

7:00 am-12:23 pm

1 stop8h 23m

San Francisco

Sun 10/5

1:25 pm-12:21 am

1 stop7h 56m

$293

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Sat 8/23

6:00 am-11:56 am

1 stop8h 56m

San Francisco

Tue 9/23

10:15 am-11:59 pm

1 stop10h 44m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 58 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 $276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of $358). 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 July 30, 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 July 30, 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 July 30, 2025.
Read through reviews of airlines operating flights from Ontario to San Francisco, such as Alaska Airlines, Porter Airlines, and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

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

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

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
318 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

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
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

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

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

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

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

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?

    If you book a flight to San Francisco from Ontario, you will be flying to San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.8 mi from the center of San Francisco.

  • What are the cheapest airlines to fly from Region of Ontario to San Francisco one-way?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at $159. Porter Airlines flights start at $161 while deals on Air Canada start at $172 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?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Region of Ontario to San Francisco on time: Singapore Airlines (79%), Porter Airlines (79%), Air Transat (79%).

  • What are the cheapest flights from Region of Ontario to San Francisco?

    Looking at all options, your cheapest flight can be booked for $175. While the most popular route (Toronto Pearson Intl - San Francisco) can be booked for $250 on average our data indicates $1,509 when flying from Region of Ontario to San Francisco.

  • 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 $276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of $358). 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

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Mountain View
Santa Cruz
South San Francisco
Livermore
Turlock
Manteca
Antioch
Hollister
Watsonville
Sunnyvale
Newark
Milpitas
Campbell
Foster City
Capitola
Santa Clara
San Leandro
Burlingame
Redwood City

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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 2,558,603 searches. Data last updated July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$174Average$308FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$222Average$388FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$241Average$524FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$250Average$426FlexibilityNo cancel feeOn-time52%
American AirlinesCheapest$288Average$475FlexibilityNo cancel feeOn-time71%
DeltaCheapest$308Average$383FlexibilityNo cancel feeOn-timeN/A
Air TransatCheapest$310Average$365FlexibilityNo cancel feeOn-time50%

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