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$116+ 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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$232
(Kiwi.com)

One-way from

$116
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$405

Good round-trip deal

$386 or less

Good one-way deal

$170 or less
Provider with most accurate pricing for San Francisco-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Toronto (YTO) flights.
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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. 6% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 25, 2025.

This Mytrip deal was found by Cheapflights users on 3/24. 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 5/510:15 amSFO - YKF
1 stop17h 55mFlair Airlines
Sun 5/118:25 pmYKF - SFO
1 stop16h 05mFlair Airlines
Deal found 3/24$237
This Kiwi.com deal was found by Cheapflights users on 3/24. 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 4/229:45 pmSFO - YYZ
1 stop29h 10mMultiple Airlines
Wed 4/3012:00 pmYYZ - SFO
2 stops14h 59mMultiple Airlines
Deal found 3/24$242
This Mytrip deal was found by Cheapflights users on 3/24. 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 5/1410:15 amSFO - YKF
1 stop30h 10mMultiple Airlines
Mon 5/196:00 amYKF - SFO
1 stop9h 05mMultiple Airlines
Deal found 3/24$249
This Kiwi.com deal was found by Cheapflights users on 3/24. 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 5/612:50 pmSFO - YYZ
1 stop8h 34mWestJet
Tue 5/136:30 amYYZ - SFO
1 stop8h 35mWestJet
Deal found 3/24$261
This Mytrip deal was found by Cheapflights users on 3/23. 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.
Sun 5/410:15 amSFO - YYZ
1 stop18h 00mFlair Airlines
Tue 5/137:40 amYYZ - SFO
1 stop28h 50mFlair Airlines
Deal found 3/23$264
This Flightnetwork deal was found by Cheapflights users on 3/24. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/82:45 pmSFO - YXU
2 stops11h 29mMultiple Airlines
Thu 5/153:35 pmYXU - SFO
1 stop9h 14mMultiple Airlines
Deal found 3/24$279
This Trip.com deal was found by Cheapflights users on 3/23. 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 6/106:05 pmSFO - YXU
1 stop8h 09mWestJet
Tue 6/176:00 amYXU - SFO
1 stop9h 05mWestJet
Deal found 3/23$283
This Trip.com deal was found by Cheapflights users on 3/24. 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 5/1412:50 pmSFO - YHM
1 stop8h 51mWestJet
Sun 5/256:00 amYHM - SFO
1 stop9h 05mWestJet
Deal found 3/24$283
This Mytrip deal was found by Cheapflights users on 3/24. 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 5/1410:15 amSFO - YTZ
2 stops27h 12mMultiple Airlines
Mon 5/197:00 amYTZ - SFO
2 stops29h 30mMultiple Airlines
Deal found 3/24$283
This Trip.com deal was found by Cheapflights users on 3/24. 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 5/212:50 pmSFO - YUL
1 stop8h 53mMultiple Airlines
Sun 5/116:45 amYUL - SFO
1 stop8h 45mMultiple Airlines
Deal found 3/24$283
This Trip.com deal was found by Cheapflights users on 3/24. 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 4/111:40 pmSFO - YUL
1 stop7h 55mPorter Airlines
Mon 4/216:45 amYUL - SFO
1 stop8h 54mPorter Airlines
Deal found 3/24$286
This Priceline deal was found by Cheapflights users on 3/24. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/512:50 pmSFO - YKF
1 stop8h 56mWestJet
Mon 5/126:00 amYKF - SFO
1 stop9h 05mWestJet
Deal found 3/24$290

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 March 25, 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

Mon 5/5

10:15 am-7:10 am

1 stop17h 55m

Toronto Region of Waterloo Intl

Sun 5/11

8:25 pm-9:30 am

1 stop16h 05m

$237

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Tue 4/22

9:45 pm-5:55 am

1 stop29h 10m

Toronto Pearson Intl

Wed 4/30

12:00 pm-11:59 pm

2 stops14h 59m

$242

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Wed 5/14

10:15 am-7:25 pm

1 stop30h 10m

Toronto Region of Waterloo Intl

Mon 5/19

6:00 am-12:05 pm

1 stop9h 05m

$249

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Tue 5/6

12:50 pm-12:24 am

1 stop8h 34m

Toronto Pearson Intl

Tue 5/13

6:30 am-12:05 pm

1 stop8h 35m

$261

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Sun 5/4

10:15 am-7:15 am

1 stop18h 00m

Toronto Pearson Intl

Tue 5/13

7:40 am-9:30 am

1 stop28h 50m

$264

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 5/8

2:45 pm-5:14 am

2 stops11h 29m

London

Thu 5/15

3:35 pm-9:49 pm

1 stop9h 14m

$279

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 6/10

6:05 pm-5:14 am

1 stop8h 09m

London

Tue 6/17

6:00 am-12:05 pm

1 stop9h 05m

$283

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 5/14

12:50 pm-12:41 am

1 stop8h 51m

Hamilton

Sun 5/25

6:00 am-12:05 pm

1 stop9h 05m

$283

San FranciscoToronto

SFO - YTZ

SFOYTZ

San Francisco

Wed 5/14

10:15 am-4:27 pm

2 stops27h 12m

Toronto Island

Mon 5/19

7:00 am-9:30 am

2 stops29h 30m

$283

San FranciscoMontreal

SFO - YUL

SFOYUL

San Francisco

Fri 5/2

12:50 pm-12:43 am

1 stop8h 53m

Montreal Pierre Elliott Trudeau Intl

Sun 5/11

6:45 am-12:30 pm

1 stop8h 45m

$283

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

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 July is currently the most expensive (average of $359). 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 March 25, 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 March 25, 2025.

The most flights from SFO to CAON are scheduled on a Tuesday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 March 25, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta and Porter Airlines from San Francisco to Ontario to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,782 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,890 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Porter Airlines
7.9
Good
275 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Air Transat
7.8
Good
381 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Copa Airlines
7.6
Good
1,393 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $130. Flair Airlines flights start at $132 while deals on Porter Airlines start at $140 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 Region of Waterloo Intl 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 (75%), Air Transat (75%), United Airlines( 73%).

  • 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 $1,561, our data indicates the cheapest price to be $134. The most popular route (San Francisco - Toronto Pearson Intl), is priced around $248.

  • 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 July is currently the most expensive (average of $359). 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 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 March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$169Average$482FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$186Average$540FlexibilityNo cancel feeOn-time69%
DeltaCheapest$187Average$551FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$192Average$641FlexibilityNo cancel feeOn-time67%
Air TransatCheapest$194Average$410FlexibilityNo cancel feeOn-time50%
American AirlinesCheapest$205Average$578FlexibilityNo cancel feeOn-time71%
WestJetCheapest$216Average$441FlexibilityNo cancel feeOn-time60%
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