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Ontario

$89+ 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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$256
(Trip.com)

One-way from

$89
(Mytrip)

Popular in

December

Cheapest in

April

Average price

$451

Good round-trip deal

$402 or less

Good one-way deal

$227 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. 11% potential increase in price ($58 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:50 pmSFO - YHM
1 stop8h 50mWestJet
Sun 10/56:00 amYHM - SFO
1 stop8h 54mWestJet
Deal found 9/9$224
This Trip.com deal was found by Cheapflights users on 9/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1112:50 pmSFO - YHM
1 stop8h 50mWestJet
Sat 10/186:00 amYHM - SFO
1 stop8h 54mWestJet
Deal found 9/8$236
This FlightHub deal was found by Cheapflights users on 9/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/712:50 pmSFO - YHM
1 stop8h 50mWestJet
Mon 10/206:00 amYHM - SFO
1 stop8h 54mWestJet
Deal found 9/9$238
This oojo deal was found by Cheapflights users on 9/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:50 pmSFO - YHM
1 stop8h 50mWestJet
Wed 10/86:00 amYHM - SFO
1 stop8h 54mWestJet
Deal found 9/8$241
This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1712:50 pmSFO - YHM
1 stop8h 50mWestJet
Thu 10/236:00 amYHM - SFO
1 stop8h 54mWestJet
Deal found 9/9$246
This Mytrip deal was found by Cheapflights users on 9/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1610:15 amSFO - YHM
1 stop10h 44mMultiple Airlines
Mon 10/205:45 pmYHM - SFO
1 stop18h 45mMultiple Airlines
Deal found 9/9$247
This Trip.com deal was found by Cheapflights users on 9/10. 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 9/307:30 amSFO - YHM
1 stop14h 10mWestJet
Thu 10/26:00 amYHM - SFO
1 stop8h 54mWestJet
Deal found 9/10$256
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 9/2612:50 pmSFO - YYZ
2 stops23h 56mWestJet
Tue 9/301:30 pmYYZ - SFO
1 stop10h 54mWestJet
Deal found 9/9$257
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Sat 9/2712:50 pmSFO - YYZ
2 stops14h 01mMultiple Airlines
Sat 10/49:45 amYYZ - SFO
Nonstop5h 38mMultiple Airlines
Deal found 9/8$258
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Sun 9/217:30 amSFO - YYZ
2 stops14h 01mWestJet
Mon 9/296:30 amYYZ - SFO
1 stop10h 27mWestJet
Deal found 9/8$259
This Mytrip deal was found by Cheapflights users on 9/10. 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 10/1510:15 amSFO - YHM
1 stop10h 44mMultiple Airlines
Fri 10/175:45 pmYHM - SFO
1 stop18h 45mMultiple Airlines
Deal found 9/10$259
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Sat 9/207:30 amSFO - YYZ
1 stop8h 22mWestJet
Wed 10/112:00 pmYYZ - SFO
2 stops12h 24mWestJet
Deal found 9/8$260

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 September 11, 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 FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Mon 10/6

12:50 pm-12:40 am

1 stop8h 50m

Hamilton

Wed 10/8

6:00 am-11:54 am

1 stop8h 54m

$241

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 10/16

10:15 am-12:40 am

2 stops11h 25m

Hamilton

Mon 10/20

5:45 pm-9:30 am

1 stop18h 45m

$260

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 10/8

12:50 pm-12:40 am

1 stop8h 50m

Hamilton

Mon 10/20

6:00 am-11:54 am

1 stop8h 54m

$262

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Fri 10/17

12:50 pm-12:40 am

1 stop8h 50m

Hamilton

Sat 10/25

6:00 am-11:54 am

1 stop8h 54m

$264

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Mon 10/20

12:50 pm-12:40 am

1 stop8h 50m

Hamilton

Thu 10/23

6:00 am-11:54 am

1 stop8h 54m

$267

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 10/1

12:50 pm-12:40 am

1 stop8h 50m

Hamilton

Tue 10/14

6:00 am-11:54 am

1 stop8h 54m

$268

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 10/1

10:15 am-11:59 pm

1 stop10h 44m

Hamilton

Sun 10/5

5:45 pm-9:30 am

1 stop18h 45m

$283

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Fri 9/26

12:50 pm-12:40 am

1 stop8h 50m

Hamilton

Tue 9/30

6:00 am-11:54 am

1 stop8h 54m

$283

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 10/1

12:50 pm-12:40 am

1 stop8h 50m

Hamilton

Sun 10/5

6:00 am-1:57 pm

2 stops34h 57m

$286

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 10/24

10:15 am-5:12 am

2 stops15h 57m

London

Fri 10/31

8:00 pm-9:30 am

2 stops16h 30m

$299

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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, 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 September 11, 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 September 11, 2025.

The most flights from SFO to CAON are scheduled on a Monday (25 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (21 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 September 11, 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
7.9
Good
363 reviews

Food

7.6

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.6

Comfort

7.9

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
7.9
Good
363 reviews
Porter Airlines
7.9
Good
363 reviews

Food

7.6

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.6

Comfort

7.9

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
7.7
Good
438 reviews
Porter Airlines
7.9
Good
363 reviews

Food

7.6

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.6

Comfort

7.9

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
8,937 reviews
Porter Airlines
7.9
Good
363 reviews

Food

7.6

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.6

Comfort

7.9

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
3,091 reviews
Porter Airlines
7.9
Good
363 reviews

Food

7.6

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.6

Comfort

7.9

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
10,000 reviews
Porter Airlines
7.9
Good
363 reviews

Food

7.6

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.6

Comfort

7.9

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, Flair Airlines, and United Airlines fly from San Francisco to Region of Ontario in about 8h 50m. The time it takes to get you to your destination can typically vary by up to 7h 25m. There are 2240 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 $97. Delta flights start at $171 while deals on Porter Airlines start at $173 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: Porter Airlines (74%), Air Transat (74%), Brussels Airlines( 69%).

  • 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 $1,168, our data indicates the cheapest price to be $177. The most popular route (San Francisco - Toronto Pearson Intl), is priced around $203.

  • 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.

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$81FlexibilityNo cancel feeOn-time62%
Air CanadaCheapest$136Average$513FlexibilityNo cancel feeOn-time67%
WestJetCheapest$162Average$400FlexibilityNo cancel feeOn-time60%
Porter AirlinesCheapest$165Average$381FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$186Average$496FlexibilityNo cancel feeOn-time69%
Air TransatCheapest$192Average$410FlexibilityNo cancel feeOn-time50%
DeltaCheapest$197Average$551FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$403Average$559FlexibilityNo cancel feeOn-time71%

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