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$133+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
ene. 14 — ene. 211
mié. 1/14
mié. 1/21
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 diciembre 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/13. 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.
lun. 12/159:30 pmYYZ - SFO
1 stop17h 42mMultiple Airlines
jue. 1/2210:15 amSFO - YYZ
1 stop11h 23mMultiple Airlines
Deal found 12/13$410
This Kiwi.com deal was found by Cheapflights users on 12/13. 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.
lun. 12/1511:45 amYYZ - SFO
1 stop27h 27mWestJet
jue. 1/221:00 pmSFO - YYZ
1 stop8h 26mWestJet
Deal found 12/13$444
This oojo deal was found by Cheapflights users on 12/13. 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.
lun. 12/156:10 pmYHM - SFO
1 stop21h 02mWestJet
jue. 1/221:00 pmSFO - YHM
1 stop21h 22mWestJet
Deal found 12/13$478
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
mié. 12/313:40 pmYOW - SFO
2 stops43h 08mMultiple Airlines
dom. 3/110:15 amSFO - YOW
1 stop25h 29mMultiple Airlines
Deal found 12/15$478
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
mié. 12/313:40 pmYOW - SFO
2 stops43h 08mMultiple Airlines
jue. 3/51:00 pmSFO - YOW
1 stop8h 40mMultiple Airlines
Deal found 12/15$491
This Mytrip deal was found by Cheapflights users on 12/13. 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.
lun. 12/159:45 amYYZ - SFO
Nonstop5h 55mPorter Airlines
jue. 1/221:40 pmSFO - YYZ
Nonstop4h 57mPorter Airlines
Deal found 12/13$515
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
mié. 12/319:25 amYOW - SFO
2 stops17h 59mMultiple Airlines
mar. 3/310:15 amSFO - YOW
1 stop25h 29mMultiple Airlines
Deal found 12/15$518
This FlightHub deal was found by Cheapflights users on 12/15. 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.
mié. 12/249:45 amYYZ - SFO
Nonstop5h 55mPorter Airlines
mié. 1/71:45 pmSFO - YYZ
Nonstop4h 57mPorter Airlines
Deal found 12/15$518
This United Airlines deal was found by Cheapflights users on 12/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/295:25 pmYUL - SFO
1 stop17h 15mUnited Airlines
mié. 1/75:00 amSFO - YUL
2 stops13h 42mUnited Airlines
Deal found 12/15$523
This Alaska Airlines deal was found by Cheapflights users on 12/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/154:45 pmYYZ - SFO
2 stops32h 01mAlaska Airlines
jue. 1/227:57 amSFO - YYZ
2 stops28h 38mAlaska Airlines
Deal found 12/13$524
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
mié. 12/319:25 amYOW - SFO
2 stops17h 59mMultiple Airlines
jue. 2/2610:15 amSFO - YOW
1 stop25h 30mMultiple Airlines
Deal found 12/15$527
This Kiwi.com deal was found by Cheapflights users on 12/12. 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.
mié. 12/247:10 amYYZ - SFO
2 stops40h 20mMultiple Airlines
sáb. 2/281:40 pmSFO - YYZ
Nonstop4h 57mMultiple Airlines
Deal found 12/12$529

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 diciembre 15, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$232
(Trip.com)

One-way from

$133
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$480

Good round-trip deal

$439 or less

Good one-way deal

$283 or less
Provider with most accurate pricing for Toronto (YTO)-San Francisco flight deals.
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Provider most trusted by Cheapflights users for Toronto (YTO)-San Francisco flights.
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From Ontario to San Francisco
Search Deals
One-way flight from Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 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.
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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 2,558,603 searches. Data last updated diciembre 15, 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

mié. 5/20

6:00 am-11:54 am

1 stop8h 54m

San Francisco

mar. 5/26

12:50 pm-12:40 am

1 stop8h 50m

$232

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

mar. 1/13

5:45 am-12:12 pm

1 stop9h 27m

San Francisco

mar. 1/20

1:00 pm-5:17 pm

1 stop25h 17m

$250

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

mar. 1/27

5:45 am-12:12 pm

1 stop9h 27m

San Francisco

mar. 2/3

1:00 pm-5:16 pm

1 stop25h 16m

$252

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

mar. 1/13

5:45 am-12:12 pm

1 stop9h 27m

San Francisco

jue. 1/15

1:00 pm-1:22 pm

1 stop21h 22m

$273

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

dom. 5/24

6:00 am-11:54 am

1 stop8h 54m

San Francisco

mar. 6/2

6:05 pm-12:40 am

1 stop27h 35m

$276

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

sáb. 1/17

7:00 pm-9:30 am

2 stops17h 30m

San Francisco

vie. 1/23

1:00 pm-5:28 am

1 stop13h 28m

$279

LondonSan Francisco

YXU - SFO

YXUSFO

London

jue. 1/29

5:10 am-10:54 am

1 stop8h 44m

San Francisco

jue. 2/5

7:30 am-9:21 pm

2 stops10h 51m

$279

LondonSan Francisco

YXU - SFO

YXUSFO

London

jue. 1/29

8:10 pm-12:12 pm

1 stop19h 02m

San Francisco

jue. 2/5

1:00 pm-6:35 am

1 stop14h 35m

$279

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

mar. 1/13

5:45 am-12:12 pm

1 stop9h 27m

San Francisco

jue. 1/29

1:00 pm-1:22 pm

1 stop21h 22m

$285

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

sáb. 1/17

9:45 am-12:38 pm

Nonstop5h 53m

San Francisco

mar. 1/20

1:40 pm-9:37 pm

Nonstop4h 57m

$300

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

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 $144). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of $242). 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 diciembre 15, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 31% 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 December 16, 2024.

Travelers seeking maximum savings on their Region of Ontario to San Francisco flight should consider departing on Wednesday mornings 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 diciembre 15, 2025.

The most flights from CAON to SFO are scheduled on a Friday (21 on average). You will have fewer flight options on Thursday, 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?

    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 53m. 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 $109. Porter Airlines flights start at $153 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 Ottawa - 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 (73%), United Airlines (72%), Porter Airlines (72%).

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

    Looking at all options, your cheapest flight can be booked for $170. While the most popular route (Toronto Pearson Intl - San Francisco) can be booked for $223 on average, our data indicates $825 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, April is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $144). Flying from Region of Ontario to San Francisco in January is currently the most expensive (average of $242). 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
South San Francisco
Santa Cruz
Livermore
Turlock
Manteca
Watsonville
Redwood City
Sunnyvale
Santa Clara
San Bruno
Daly City
San Carlos
Vallejo
Hollister
San Ramon
Foster City
Union City
Davis
Emeryville

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 2,558,603 searches. Data last updated diciembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$118Average$309FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$222Average$348FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$241Average$444FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$258Average$407FlexibilityNo cancel feeOn-time52%
American AirlinesCheapest$307Average$426FlexibilityNo cancel feeOn-time71%
DeltaCheapest$308Average$375FlexibilityNo cancel feeOn-timeN/A
Air TransatCheapest$324Average$478FlexibilityNo cancel feeOn-time50%

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