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$121+ Cheap flights from San Francisco (SFO) to Ontario

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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Find flight deals from San Francisco to Ontario

Cheapest flights from San Francisco to Ontario
Explore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/27. 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 12/410:15 amSFO - YYZ
1 stop11h 23mMultiple Airlines
Wed 12/109:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 10/27$273
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Sun 12/145:46 pmSFO - YYZ
1 stop10h 01mMultiple Airlines
Fri 1/168:00 pmYYZ - SFO
1 stop22h 53mMultiple Airlines
Deal found 10/27$275
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 12/1110:15 amSFO - YYZ
1 stop10h 39mMultiple Airlines
Sun 1/118:00 pmYYZ - SFO
1 stop14h 48mMultiple Airlines
Deal found 10/26$276
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 12/1110:15 amSFO - YYZ
2 stops29h 41mMultiple Airlines
Thu 12/189:35 amYYZ - SFO
1 stop25h 13mMultiple Airlines
Deal found 10/27$278
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Thu 12/410:15 amSFO - YYZ
3 stops29h 11mMultiple Airlines
Sun 12/79:45 amYYZ - SFO
Nonstop5h 55mMultiple Airlines
Deal found 10/28$281
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Mon 12/154:59 pmSFO - YYZ
1 stop10h 48mMultiple Airlines
Thu 1/89:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 10/26$283
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Sat 12/610:15 amSFO - YYZ
1 stop11h 23mMultiple Airlines
Wed 12/109:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 10/26$285
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Sun 12/1410:15 amSFO - YYZ
1 stop10h 39mMultiple Airlines
Thu 1/89:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 10/26$287
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 12/118:43 amSFO - YYZ
1 stop8h 49mMultiple Airlines
Thu 1/89:35 amYYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 10/26$288
This Mytrip deal was found by Cheapflights users on 10/27. 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 12/410:15 amSFO - YYZ
2 stops17h 43mMultiple Airlines
Mon 12/89:00 pmYYZ - SFO
1 stop15h 30mMultiple Airlines
Deal found 10/27$289
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Mon 12/88:43 amSFO - YOW
2 stops27h 01mMultiple Airlines
Thu 12/116:00 amYOW - SFO
1 stop9h 12mMultiple Airlines
Deal found 10/27$327
This Mytrip deal was found by Cheapflights users on 10/25. 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.
Mon 11/178:25 amSFO - YTZ
1 stop8h 30mAir Canada
Sun 11/233:30 pmYTZ - SFO
1 stop8h 52mAir Canada
Deal found 10/25$335

Cheap flight deals from San Francisco to Ontario

Keep the following information in mind while searching for San Francisco to Ontario flight deals. Data was last updated October 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$266
(Kiwi.com)

One-way from

$121
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$421

Good round-trip deal

$454 or less

Good one-way deal

$198 or less
Provider with most accurate pricing for San Francisco-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Toronto (YTO) flights.
Search Deals
From San Francisco to Ontario
Search Deals
One-way flight from San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($50 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from San Francisco to Ontario.
Search Deals
Price to beat on a one-way flight from San Francisco to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Ontario 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 October 28, 2025.
Use the filters below to find and compare flights from San Francisco to Ontario that are best for you.

Fly from

San Francisco

Fly to

Ontario

Route

Depart

Return

Price

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 1/16

1:00 pm-5:28 am

1 stop13h 28m

Toronto Region of Waterloo Intl

Thu 1/22

6:20 am-12:12 pm

1 stop8h 52m

$283

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 1/30

1:00 pm-5:28 am

1 stop13h 28m

Toronto Region of Waterloo Intl

Mon 2/9

6:20 am-12:10 pm

1 stop8h 50m

$288

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 2/5

1:00 pm-1:21 pm

1 stop21h 21m

Hamilton

Mon 2/9

6:10 pm-12:10 pm

1 stop21h 00m

$325

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 1/16

1:00 pm-5:28 am

1 stop13h 28m

Toronto Region of Waterloo Intl

Sat 1/17

7:00 pm-12:12 pm

1 stop20h 12m

$332

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 3/20

1:00 pm-5:29 am

1 stop13h 29m

Toronto Region of Waterloo Intl

Tue 3/24

6:20 am-12:10 pm

1 stop8h 50m

$332

San FranciscoToronto

SFO - YTZ

SFOYTZ

San Francisco

Mon 11/17

8:25 am-9:35 pm

1 stop10h 10m

Toronto Island

Mon 11/24

3:30 pm-9:22 pm

1 stop8h 52m

$345

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 12/12

1:00 pm-5:28 am

1 stop13h 28m

Toronto Region of Waterloo Intl

Thu 1/8

6:20 am-12:12 pm

1 stop8h 52m

$355

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 3/19

1:00 pm-1:21 pm

1 stop21h 21m

Hamilton

Tue 3/24

5:50 am-12:10 pm

1 stop9h 20m

$358

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Tue 12/9

2:21 pm-3:35 pm

1 stop22h 14m

Toronto Pearson Intl

Fri 12/12

4:45 pm-11:00 am

1 stop21h 15m

$373

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Tue 12/2

2:32 pm-3:35 pm

2 stops22h 03m

Toronto Pearson Intl

Fri 12/5

4:45 pm-6:03 pm

1 stop28h 18m

$379

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 60 results
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Best time to book a flight from San Francisco to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from San Francisco 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 San Francisco to Ontario

What is the cheapest month to book a flight from San Francisco to Region of Ontario?

Currently, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of $127). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of $203). 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 SFO to ON?

Find hourly flight availability from San Francisco to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 28, 2025.

One of the essential ways to save on airfare from San Francisco to Region of Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 41% on airfare.

What is the cheapest day to fly from San Francisco to Region of Ontario?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Francisco to Region of Ontario flight should consider departing on Sunday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated October 28, 2025.
Peruse reviews from past customers who have flown with Porter Airlines, Air Transat, and United Airlines from San Francisco to Ontario to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
384 reviews

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
8.0
Very good
384 reviews
Porter Airlines
8.0
Very good
384 reviews

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Transat
7.8
Good
469 reviews
Porter Airlines
8.0
Very good
384 reviews

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,996 reviews
Porter Airlines
8.0
Very good
384 reviews

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
WestJet
7.2
Good
3,148 reviews
Porter Airlines
8.0
Very good
384 reviews

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,370 reviews
Porter Airlines
8.0
Very good
384 reviews

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Ontario. 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 from for flights from San Francisco to Ontario?

    Most people fly from San Francisco (SFO) if they book a flight from San Francisco to Ontario. San Francisco is conveniently located just 11.8 mi from San Francisco’s city center.

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

    Airlines like WestJet, Air Canada, and Alaska Airlines fly from San Francisco to Region of Ontario in about 10h 10m. The time it takes to get you to your destination can typically vary by up to 12h 04m. There are 2264 mi between San Francisco and Region of Ontario. This flight may include one or multiple stops.

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

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at $141. Alaska Airlines flights start at $158 while deals on Air Canada start at $240 one-way.

  • What are the most popular routes from San Francisco to Region of Ontario?

    Most travelers choose San Francisco - Toronto Pearson Intl, San Francisco - Montreal Pierre Elliott Trudeau Intl or San Francisco - Toronto Island when deciding on the best route from San Francisco to Region of Ontario.

  • What are the most reliable airlines from San Francisco to Region of Ontario?

    Before booking your flight to Region of Ontario from San Francisco, check out the most reliable airlines to get you to your destination on time: Air Canada (75%), United Airlines (75%), Porter Airlines( 74%).

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

    Looking for the cheapest flight from San Francisco to Region of Ontario? While on average our users pay $1,019, our data indicates the cheapest price to be $129. The most popular route (San Francisco - Toronto Pearson Intl), is priced around $252.

  • Can I find deals for flights from San Francisco to Ontario that include hotel bookings?

    Yes. In addition to deals on San Francisco to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Ontario.

  • Can I find deals for business class flights from San Francisco to Ontario?

    Yes. Cheapflights offers flight deals from San Francisco to Ontario 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 San Francisco to Region of Ontario?

    Currently, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of $127). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of $203). 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

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Alternative routes for San Francisco to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from San Francisco to Ontario

Discover the top 8 airlines that operate flights from San Francisco to Ontario. 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$81FlexibilityNo cancel feeOn-time62%
Air CanadaCheapest$136Average$526FlexibilityNo cancel feeOn-time67%
WestJetCheapest$162Average$400FlexibilityNo cancel feeOn-time60%
Porter AirlinesCheapest$170Average$357FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$186Average$507FlexibilityNo cancel feeOn-time69%
Air TransatCheapest$191Average$422FlexibilityNo cancel feeOn-time50%
DeltaCheapest$197Average$550FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$403Average$554FlexibilityNo cancel feeOn-time71%

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