HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$131+ 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 7/15. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
Apr 16 — Apr 231
Wed 4/16
Wed 4/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Francisco to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 11, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$235
(Kiwi.com)

One-way from

$132
(Mytrip)

Popular in

December

Cheapest in

February

Average price

$375

Good round-trip deal

$388 or less

Good one-way deal

$177 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. 8% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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

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 April 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/9. 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.
Tue 4/291:45 pmSFO - YYZ
1 stop13h 10mMultiple Airlines
Wed 5/71:30 pmYYZ - SFO
2 stops21h 14mMultiple Airlines
Deal found 4/9$235
This Justfly.com deal was found by Cheapflights users on 4/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/412:50 pmSFO - YKF
1 stop8h 56mWestJet
Fri 8/86:00 amYKF - SFO
2 stops10h 59mWestJet
Deal found 4/11$252
This Mytrip deal was found by Cheapflights users on 4/10. 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.
Thu 5/1510:15 amSFO - YKF
1 stop30h 10mMultiple Airlines
Mon 5/196:00 amYKF - SFO
1 stop9h 05mMultiple Airlines
Deal found 4/10$256
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/87:30 amSFO - YYZ
2 stops14h 03mWestJet
Wed 7/163:00 pmYYZ - SFO
1 stop9h 25mWestJet
Deal found 4/10$265
This Justfly.com deal was found by Cheapflights users on 4/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/712:50 pmSFO - YHM
1 stop8h 51mWestJet
Tue 8/126:00 amYHM - SFO
2 stops10h 59mWestJet
Deal found 4/11$271
This Kiwi.com deal was found by Cheapflights users on 4/9. 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.
Tue 4/291:45 pmSFO - YOW
1 stop24h 00mMultiple Airlines
Thu 5/86:00 amYOW - SFO
1 stop9h 05mMultiple Airlines
Deal found 4/9$271
This Mytrip deal was found by Cheapflights users on 4/10. 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 5/1410:15 amSFO - YTZ
2 stops27h 12mMultiple Airlines
Sun 5/183:35 pmYTZ - SFO
2 stops20h 55mMultiple Airlines
Deal found 4/10$282
This Mytrip deal was found by Cheapflights users on 4/10. 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.
Sat 5/1010:15 amSFO - YKF
1 stop17h 55mFlair Airlines
Sat 5/178:25 pmYKF - SFO
1 stop16h 05mFlair Airlines
Deal found 4/10$286
This Trip.com deal was found by Cheapflights users on 4/9. 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.
Sat 5/242:45 pmSFO - YXU
2 stops11h 29mWestJet
Sat 5/316:00 amYXU - SFO
2 stops10h 59mWestJet
Deal found 4/9$289
This Trip.com deal was found by Cheapflights users on 4/9. 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 7/1612:50 pmSFO - YUL
1 stop8h 53mWestJet
Fri 7/256:45 amYUL - SFO
2 stops13h 30mWestJet
Deal found 4/9$300
This Trip.com deal was found by Cheapflights users on 4/11. 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.
Sun 6/296:05 pmSFO - YOW
1 stop9h 40mWestJet
Sat 7/126:10 amYOW - SFO
1 stop11h 38mWestJet
Deal found 4/11$303
This oojo deal was found by Cheapflights users on 4/11. 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.
Thu 7/247:30 amSFO - YQT
1 stop8h 25mWestJet
Mon 8/47:40 pmYQT - SFO
2 stops21h 19mWestJet
Deal found 4/11$309

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 April 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 FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Tue 4/29

1:45 pm-5:55 am

1 stop13h 10m

Toronto Pearson Intl

Wed 5/7

1:30 pm-7:44 am

2 stops21h 14m

$235

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Mon 8/4

12:50 pm-12:46 am

1 stop8h 56m

Toronto Region of Waterloo Intl

Fri 8/8

6:00 am-1:59 pm

2 stops10h 59m

$252

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Thu 5/15

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

$256

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Tue 7/8

7:30 am-12:33 am

2 stops14h 03m

Toronto Pearson Intl

Wed 7/16

3:00 pm-9:25 pm

1 stop9h 25m

$265

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 8/7

12:50 pm-12:41 am

1 stop8h 51m

Hamilton

Tue 8/12

6:00 am-1:59 pm

2 stops10h 59m

$271

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Tue 4/29

1:45 pm-4:45 pm

1 stop24h 00m

Ottawa

Thu 5/8

6:00 am-12:05 pm

1 stop9h 05m

$271

San FranciscoToronto

SFO - YTZ

SFOYTZ

San Francisco

Wed 5/14

10:15 am-4:27 pm

2 stops27h 12m

Toronto Island

Sun 5/18

3:35 pm-9:30 am

2 stops20h 55m

$282

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Sat 5/10

10:15 am-7:10 am

1 stop17h 55m

Toronto Region of Waterloo Intl

Sat 5/17

8:25 pm-9:30 am

1 stop16h 05m

$286

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 5/24

2:45 pm-5:14 am

2 stops11h 29m

London

Sat 5/31

6:00 am-1:59 pm

2 stops10h 59m

$289

San FranciscoMontreal

SFO - YUL

SFOYUL

San Francisco

Wed 7/16

12:50 pm-12:43 am

1 stop8h 53m

Montreal Pierre Elliott Trudeau Intl

Fri 7/25

6:45 am-5:15 pm

2 stops13h 30m

$300

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/10

Showing 1-10 of 60 results
1
2
3
...
6

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 April 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 April 11, 2025.

The most flights from SFO to CAON are scheduled on a Wednesday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 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 April 11, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Porter Airlines and Delta 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
9,851 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

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
9,851 reviews
Alaska Airlines
8.0
Very good
9,851 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

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
8.0
Very good
280 reviews
Alaska Airlines
8.0
Very good
9,851 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

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
7,911 reviews
Alaska Airlines
8.0
Very good
9,851 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

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
385 reviews
Alaska Airlines
8.0
Very good
9,851 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

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
1,408 reviews
Alaska Airlines
8.0
Very good
9,851 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

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 $135. Flair Airlines flights start at $138 while deals on Air Canada start at $154 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: United Airlines (71%), Austrian Airlines (66%), Singapore Airlines( 66%).

  • 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 $1,187, our data indicates the cheapest price to be $138. The most popular route (San Francisco - Toronto Pearson Intl), is priced around $235.

  • 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Francisco to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Vancouver Intl flights
San Francisco to Vancouver Intl flights
San Francisco to Pearson Intl flights
Los Angeles to Pearson Intl flights
San Francisco to Calgary flights
Sacramento to Vancouver Intl flights
San Diego to Vancouver Intl flights
Los Angeles to Calgary flights
San Francisco to Abbotsford flights
San Francisco to Pierre Elliott Trudeau Intl flights
Ontario to Vancouver Intl flights
Los Angeles to Abbotsford flights
Santa Ana to Vancouver Intl flights
Los Angeles to Pierre Elliott Trudeau Intl flights
San Diego to Calgary flights
San Diego to Pearson Intl flights
Las Vegas to Pearson Intl flights
Las Vegas to Vancouver Intl flights
Ontario to Pearson Intl flights
San Francisco to Region of Waterloo Intl flights
San Francisco to Toronto Island flights
Los Angeles to Edmonton flights
Santa Ana to Calgary flights
San Francisco to Edmonton flights
Los Angeles to Toronto Island flights
San Francisco to Hamilton flights
San Jose to Pearson Intl flights
Palm Springs to Vancouver Intl flights
Los Angeles to Region of Waterloo Intl flights
Oakland to Pearson Intl flights
Oakland to Vancouver Intl flights
San Jose to Vancouver Intl flights
Ontario to Calgary flights
Sacramento to Pearson Intl flights
San Diego to Abbotsford flights
Burbank to Vancouver Intl flights
Los Angeles to Hamilton flights
San Diego to Pierre Elliott Trudeau Intl flights
San Francisco to Ottawa flights
Las Vegas to Calgary flights
Los Angeles to Victoria flights
Santa Ana to Pearson Intl flights
Las Vegas to Edmonton flights
Los Angeles to Winnipeg flights
Ontario to Pierre Elliott Trudeau Intl flights
San Diego to Toronto Island flights
San Francisco to Victoria flights
Fresno to Vancouver Intl flights
Sacramento to Abbotsford flights
Sacramento to Calgary flights

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 April 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$136Average$677FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$166Average$470FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$186Average$534FlexibilityNo cancel feeOn-time69%
DeltaCheapest$187Average$551FlexibilityNo cancel feeOn-timeN/A
Air TransatCheapest$194Average$410FlexibilityNo cancel feeOn-time50%
American AirlinesCheapest$205Average$566FlexibilityNo cancel feeOn-time71%
WestJetCheapest$216Average$430FlexibilityNo cancel feeOn-time60%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.