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$107+ 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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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 July 29, 2025.

Round-trip from

$235
(Mytrip)

One-way from

$107
(Mytrip)

Popular in

December

Cheapest in

April

Average price

$474

Good round-trip deal

$441 or less

Good one-way deal

$185 or less
From San Francisco to Ontario
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One-way flight from San Francisco to Ontario
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Highest demand for flights based on searches. 12% potential increase in price ($59 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($16 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 San Francisco to Ontario.
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Price to beat on a one-way flight from San Francisco to Ontario.
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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 July 29, 2025.

This Mytrip deal was found by Cheapflights users on 7/27. 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 9/1810:15 amSFO - YYZ
1 stop16h 58mMultiple Airlines
Mon 9/2210:25 pmYYZ - SFO
1 stop14h 05mMultiple Airlines
Deal found 7/27$235
This Mytrip deal was found by Cheapflights users on 7/27. 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 10/1610:15 amSFO - YYZ
1 stop18h 00mFlair Airlines
Tue 10/219:00 pmYYZ - SFO
1 stop15h 30mFlair Airlines
Deal found 7/27$242
This Trip.com deal was found by Cheapflights users on 7/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/810:15 amSFO - YXU
2 stops15h 57mMultiple Airlines
Tue 9/166:00 amYXU - SFO
1 stop8h 54mMultiple Airlines
Deal found 7/27$276
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 9/410:15 amSFO - YHM
1 stop10h 44mMultiple Airlines
Wed 9/105:45 pmYHM - SFO
1 stop18h 45mMultiple Airlines
Deal found 7/28$279
This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/812:50 pmSFO - YYZ
2 stops14h 01mWestJet
Fri 9/196:45 amYYZ - SFO
2 stops13h 29mWestJet
Deal found 7/27$282
This Trip.com deal was found by Cheapflights users on 7/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/910:15 amSFO - YOW
2 stops17h 30mMultiple Airlines
Tue 9/1612:20 pmYOW - SFO
2 stops12h 04mMultiple Airlines
Deal found 7/27$283
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.
Tue 8/1912:50 pmSFO - YKF
1 stop8h 56mWestJet
Thu 8/286:00 amYKF - SFO
1 stop8h 56mWestJet
Deal found 7/29$301
This Mytrip deal was found by Cheapflights users on 7/27. 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 9/1810:15 amSFO - YKF
2 stops16h 15mMultiple Airlines
Mon 9/226:00 amYKF - SFO
1 stop14h 14mMultiple Airlines
Deal found 7/27$303
This Trip.com deal was found by Cheapflights users on 7/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/86:05 pmSFO - YXU
1 stop8h 07mWestJet
Tue 9/166:00 amYXU - SFO
1 stop8h 54mWestJet
Deal found 7/27$303
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.
Tue 8/1912:50 pmSFO - YOW
1 stop8h 51mWestJet
Fri 8/2212:20 pmYOW - SFO
2 stops12h 05mWestJet
Deal found 7/28$310
This Trip.com deal was found by Cheapflights users on 7/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3012:50 pmSFO - YHM
1 stop8h 50mWestJet
Tue 10/76:00 amYHM - SFO
1 stop8h 54mWestJet
Deal found 7/27$314
This Mytrip deal was found by Cheapflights users on 7/27. 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 8/1410:15 amSFO - YKF
1 stop17h 55mFlair Airlines
Sun 8/178:25 pmYKF - SFO
1 stop16h 05mFlair Airlines
Deal found 7/27$332

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 July 29, 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 - YYZ

SFOYYZ

San Francisco

Thu 9/18

10:15 am-6:13 am

1 stop16h 58m

Toronto Pearson Intl

Mon 9/22

10:25 pm-9:30 am

1 stop14h 05m

$235

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Thu 10/16

10:15 am-7:15 am

1 stop18h 00m

Toronto Pearson Intl

Tue 10/21

9:00 pm-9:30 am

1 stop15h 30m

$242

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 9/8

10:15 am-5:12 am

2 stops15h 57m

London

Tue 9/16

6:00 am-11:54 am

1 stop8h 54m

$276

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 9/4

10:15 am-11:59 pm

1 stop10h 44m

Hamilton

Wed 9/10

5:45 pm-9:30 am

1 stop18h 45m

$279

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Mon 9/8

12:50 pm-5:51 am

2 stops14h 01m

Toronto Pearson Intl

Fri 9/19

6:45 am-5:14 pm

2 stops13h 29m

$282

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Tue 9/9

10:15 am-6:45 am

2 stops17h 30m

Ottawa

Tue 9/16

12:20 pm-9:24 pm

2 stops12h 04m

$283

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Tue 8/19

12:50 pm-12:46 am

1 stop8h 56m

Toronto Region of Waterloo Intl

Thu 8/28

6:00 am-11:56 am

1 stop8h 56m

$301

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 9/8

6:05 pm-5:12 am

1 stop8h 07m

London

Tue 9/16

6:00 am-11:54 am

1 stop8h 54m

$303

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Thu 9/18

10:15 am-5:30 am

2 stops16h 15m

Toronto Region of Waterloo Intl

Mon 9/22

6:00 am-5:14 pm

1 stop14h 14m

$303

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Tue 8/19

12:50 pm-12:41 am

1 stop8h 51m

Ottawa

Fri 8/22

12:20 pm-9:25 pm

2 stops12h 05m

$310

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 51 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, January is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of $243). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of $348). 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 July 29, 2025.

When flying from San Francisco to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from San Francisco to Region of Ontario

Explore weekly flight availability from San Francisco to Ontario. 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 29, 2025.

The most flights from SFO to CAON are scheduled on a Monday (22 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (16 on average).

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 July 29, 2025.
Peruse reviews from past customers who have flown with Porter Airlines, Delta, and Air Transat 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
317 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Crew

8.7

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Porter Airlines
8.0
Very good
317 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Crew

8.7

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Delta
8.0
Very good
7,977 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Crew

8.7

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Transat
7.7
Good
424 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Crew

8.7

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
United Airlines
7.4
Good
8,899 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Crew

8.7

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
American Airlines
7.2
Good
10,000 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Crew

8.7

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience

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.

  • 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 $142. Flair Airlines flights start at $150 while deals on United Airlines start at $161 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: Brussels Airlines (94%), Singapore Airlines (82%), Austrian Airlines( 77%).

  • 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 $1,393, our data indicates the cheapest price to be $155. The most popular route (San Francisco - Toronto Pearson Intl), is priced around $231.

  • 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, January is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of $243). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of $348). 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 7 airlines flying from San Francisco to Ontario

Discover the top 7 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$136Average$484FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$158Average$395FlexibilityNo cancel feeOn-time52%
WestJetCheapest$162Average$385FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$186Average$521FlexibilityNo cancel feeOn-time69%
Air TransatCheapest$193Average$410FlexibilityNo cancel feeOn-time50%
DeltaCheapest$197Average$550FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$403Average$545FlexibilityNo cancel feeOn-time71%

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