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$168+ 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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
Apr 12 — Apr 191
Sun 4/12
Sun 4/19
1 adult, Economy
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Cheap 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 March 13, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/11. 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 5/16:15 am
YYZ
-
SFO
1 stop8h 45m
WestJet
Thu 5/71:00 pm
SFO
-
YYZ
1 stop9h 05m
WestJet
Deal found 3/11$283
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
Wed 4/296:15 am
YYZ
-
SFO
1 stop8h 45m
WestJet
Mon 5/46:00 am
SFO
-
YYZ
2 stops12h 35m
WestJet
Deal found 3/12$286
This Kiwi.com deal was found by Cheapflights users on 3/9. 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 5/86:15 am
YYZ
-
SFO
1 stop8h 45m
WestJet
Mon 5/116:00 am
SFO
-
YYZ
2 stops10h 55m
WestJet
Deal found 3/9$287
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
Thu 5/2812:40 pm
YYZ
-
SFO
2 stops12h 15m
WestJet
Mon 6/16:05 pm
SFO
-
YYZ
1 stop9h 50m
WestJet
Deal found 3/12$288
This Kiwi.com deal was found by Cheapflights users on 3/9. 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 5/16:15 am
YYZ
-
SFO
1 stop8h 45m
WestJet
Mon 5/46:00 am
SFO
-
YYZ
1 stop8h 10m
WestJet
Deal found 3/9$289
This Kiwi.com deal was found by Cheapflights users on 3/8. 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.
Thu 4/306:15 am
YYZ
-
SFO
1 stop8h 45m
WestJet
Thu 5/71:00 pm
SFO
-
YYZ
1 stop8h 10m
WestJet
Deal found 3/8$290
This Trip.com deal was found by Cheapflights users on 3/12. 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.
Tue 4/145:50 am
YHM
-
SFO
1 stop9h 20m
WestJet
Fri 5/86:00 am
SFO
-
YHM
1 stop8h 15m
WestJet
Deal found 3/12$291
This Super.com deal was found by Cheapflights users on 3/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/99:50 am
YYZ
-
SFO
Nonstop5h 55m
Porter Airlines
Wed 4/151:45 pm
SFO
-
YYZ
Nonstop4h 57m
Porter Airlines
Deal found 3/11$291
This SmartFares deal was found by Cheapflights users on 3/12. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:50 am
YYZ
-
SFO
Nonstop5h 55m
Porter Airlines
Wed 4/221:45 pm
SFO
-
YYZ
Nonstop4h 57m
Porter Airlines
Deal found 3/12$292
This oojo deal was found by Cheapflights users on 3/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2112:40 pm
YYZ
-
SFO
2 stops12h 15m
WestJet
Mon 5/256:00 am
SFO
-
YYZ
2 stops12h 35m
WestJet
Deal found 3/11$294
This oojo deal was found by Cheapflights users on 3/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2912:25 pm
YOW
-
SFO
2 stops12h 30m
WestJet
Mon 6/16:05 pm
SFO
-
YOW
1 stop8h 30m
WestJet
Deal found 3/12$295
This oojo deal was found by Cheapflights users on 3/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2812:40 pm
YYZ
-
SFO
2 stops12h 15m
WestJet
Sun 5/316:05 pm
SFO
-
YYZ
1 stop9h 50m
WestJet
Deal found 3/11$295

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 March 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$283
(Kiwi.com)

One-way from

$168
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$397

Good round-trip deal

$357 or less

Good one-way deal

$208 or less
Provider with most accurate pricing for Toronto (YTO)-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-San Francisco flights.
Search Deals
From Ontario to San Francisco
Search Deals
One-way flight from Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($14 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 2,558,603 searches. Data last updated March 13, 2026.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Tue 4/14

5:50 am-12:10 pm

1 stop9h 20m

San Francisco

Tue 5/12

6:00 am-5:15 pm

1 stop8h 15m

$291

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 5/27

6:15 pm-9:55 pm

2 stops30h 40m

San Francisco

Sat 6/6

6:05 pm-5:35 am

1 stop8h 30m

$322

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Fri 5/1

1:20 pm-12:00 pm

1 stop25h 40m

San Francisco

Mon 5/4

6:00 am-5:15 pm

1 stop8h 15m

$328

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Fri 5/8

1:20 pm-12:00 pm

1 stop25h 40m

San Francisco

Wed 5/27

6:00 am-5:15 pm

1 stop8h 15m

$331
Quickest round-trip

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Tue 5/12

9:45 am-12:20 pm

Nonstop5h 35m

San Francisco

Wed 5/13

1:20 pm-9:25 pm

Nonstop5h 05m

$342

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Tue 4/28

2:50 pm-9:22 pm

1 stop9h 32m

San Francisco

Tue 5/12

7:30 pm-5:22 pm

2 stops18h 52m

$351

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 6/3

6:55 am-4:40 pm

2 stops12h 45m

San Francisco

Sat 6/6

6:05 pm-5:35 am

1 stop8h 30m

$351

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Sat 5/30

9:45 am-12:20 pm

Nonstop5h 35m

San Francisco

Mon 6/8

1:20 pm-9:25 pm

Nonstop5h 05m

$362

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Tue 5/5

6:45 am-12:20 pm

1 stop8h 35m

San Francisco

Wed 5/6

1:20 pm-12:37 am

1 stop8h 17m

$368

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Fri 4/24

8:50 am-9:34 pm

2 stops15h 44m

San Francisco

Sun 5/3

8:04 am-4:14 pm

Nonstop5h 10m

$378

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Showing 1-10 of 60 resultsSorted by cheapest first
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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, August is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $159). Flying from Region of Ontario to San Francisco in December is currently the most expensive (average of $253). 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 March 13, 2026.

Unlike in the evening, when flights are generally more expensive, you can save up to 50% on flights from Region of Ontario to San Francisco by exploring options for tickets in the morning.

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 March 12, 2026.

Travelers seeking maximum savings on their Region of Ontario to San Francisco flight should consider departing on Friday at noon when fares are most often at their lowest. Saturday at noon 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 March 13, 2026.

The most flights from CAON to SFO are scheduled on a Thursday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 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?

    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.

  • How long is the flight from Region of Ontario to San Francisco?

    Departing from Region of Ontario to San Francisco will take you 5h 35m. Region of Ontario and San Francisco are separated by a distance of 2253 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $100. Porter Airlines flights start at $134 while deals on Air Canada start at $164 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: American Airlines (57%), Porter Airlines (57%), Air Transat (57%).

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

    Looking at all options, your cheapest flight can be booked for $168. While the most popular route (Toronto Pearson Intl - San Francisco) can be booked for $291 on average, our data indicates $575 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, August is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $159). Flying from Region of Ontario to San Francisco in December is currently the most expensive (average of $253). 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
South San Francisco
Santa Clara
Santa Cruz
Livermore
Roseville
Watsonville
San Bruno
Sunnyvale
Vacaville
Turlock
San Carlos
San Ramon
Redwood City
Daly City
Rancho Cordova
San Lorenzo
Davis
Hollister
Manteca
Union City

Browse thousands of different options on Cheapflights for your next trip

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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 March 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$111Average$312FlexibilityNo cancel feeOn-time60%
Porter AirlinesCheapest$250Average$435FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$258Average$402FlexibilityNo cancel feeOn-time67%
DeltaCheapest$303Average$372FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$307Average$426FlexibilityNo cancel feeOn-time71%
Air TransatCheapest$324Average$502FlexibilityNo cancel feeOn-time50%
United AirlinesCheapest$328Average$522FlexibilityNo cancel feeOn-time69%

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