HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Francisco

$142+ Cheap flights from Ontario to San Francisco (SFO)

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
abr. 20 — abr. 271
dom. 4/20
dom. 4/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to San Francisco 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 Ontario to San Francisco

Keep the following information in mind while searching for Ontario to San Francisco flight deals. Data was last updated abril 15, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$212
(Trip.com)

One-way from

$142
(Trip.com)

Popular in

December

Cheapest in

March

Average price

$335

Good round-trip deal

$318 or less

Good one-way deal

$183 or less
Provider with most accurate pricing for Toronto (YTO)-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-San Francisco flights.
Search Deals
From Ontario to San Francisco
Search Deals
One-way flight from Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($4 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 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 Ontario to San Francisco.
Search Deals
Price to beat on a one-way flight from Ontario to San Francisco.
Search Deals

Find flight deals from Ontario to San Francisco

Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 15, 2025.

This Trip.com deal was found by Cheapflights users on 4/15. 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.
mié. 5/76:00 amYHM - SFO
2 stops20h 59mMultiple Airlines
mar. 5/138:30 amSFO - YHM
2 stops13h 11mMultiple Airlines
Deal found 4/15$212
This FlightHub deal was found by Cheapflights users on 4/15. 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.
mié. 7/306:00 amYHM - SFO
1 stop9h 05mWestJet
lun. 8/1812:50 pmSFO - YHM
1 stop8h 51mWestJet
Deal found 4/15$237
This oojo deal was found by Cheapflights users on 4/15. 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.
mar. 7/16:00 amYXU - SFO
2 stops10h 59mWestJet
mié. 7/307:30 amSFO - YXU
1 stop8h 39mWestJet
Deal found 4/15$237
This Kiwi.com deal was found by Cheapflights users on 4/14. 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.
jue. 7/36:30 amYYZ - SFO
1 stop10h 29mWestJet
lun. 7/146:05 pmSFO - YYZ
1 stop9h 07mWestJet
Deal found 4/14$241
This Kiwi.com deal was found by Cheapflights users on 4/14. 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.
sáb. 5/241:50 pmYYZ - SFO
1 stop10h 29mMultiple Airlines
mié. 5/281:09 pmSFO - YYZ
1 stop8h 03mMultiple Airlines
Deal found 4/14$242
This FlightHub deal was found by Cheapflights users on 4/15. 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.
mié. 7/306:00 amYKF - SFO
1 stop9h 05mWestJet
lun. 8/187:30 amSFO - YKF
1 stop14h 16mWestJet
Deal found 4/15$246
This Trip.com deal was found by Cheapflights users on 4/15. 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.
jue. 7/35:45 amYOW - SFO
1 stop11h 14mWestJet
lun. 7/712:50 pmSFO - YOW
2 stops13h 35mWestJet
Deal found 4/15$249
This CheapTickets deal was found by Cheapflights users on 4/15. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/216:45 amYUL - SFO
1 stop8h 45mPorter Airlines
mié. 5/281:30 pmSFO - YUL
1 stop8h 07mPorter Airlines
Deal found 4/15$249
This Flightnetwork deal was found by Cheapflights users on 4/15. 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.
sáb. 5/242:35 pmYOW - SFO
1 stop8h 35mAir Canada
mié. 5/2811:25 amSFO - YOW
1 stop7h 42mAir Canada
Deal found 4/15$256
This Air Canada deal was found by Cheapflights users on 4/14. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/14:30 pmYUL - SFO
Nonstop6h 25mAir Canada
dom. 5/411:25 amSFO - YUL
Nonstop5h 40mAir Canada
Deal found 4/14$257
This eDestinos deal was found by Cheapflights users on 4/14. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/196:45 amYUL - SFO
2 stops13h 29mWestJet
mar. 9/2312:50 pmSFO - YUL
1 stop8h 51mWestJet
Deal found 4/14$261
This Air Canada deal was found by Cheapflights users on 4/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/36:15 amYXU - SFO
1 stop9h 57mAir Canada
dom. 5/410:52 pmSFO - YXU
1 stop7h 27mAir Canada
Deal found 4/15$266

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to San Francisco 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 abril 15, 2025.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.

Fly from

Ontario

Fly to

San Francisco

Route

Depart

Return

Price

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

mié. 5/7

6:00 am-11:59 pm

2 stops20h 59m

San Francisco

mar. 5/13

8:30 am-12:41 am

2 stops13h 11m

$212

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

mié. 7/30

6:00 am-12:05 pm

1 stop9h 05m

San Francisco

lun. 8/18

12:50 pm-12:41 am

1 stop8h 51m

$237

LondonSan Francisco

YXU - SFO

YXUSFO

London

mar. 7/1

6:00 am-1:59 pm

2 stops10h 59m

San Francisco

mié. 7/30

7:30 am-7:09 pm

1 stop8h 39m

$237

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

jue. 7/3

6:30 am-1:59 pm

1 stop10h 29m

San Francisco

lun. 7/14

6:05 pm-6:12 am

1 stop9h 07m

$241

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

sáb. 5/24

1:50 pm-9:19 pm

1 stop10h 29m

San Francisco

mié. 5/28

1:09 pm-12:12 am

1 stop8h 03m

$242

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

mié. 7/30

6:00 am-12:05 pm

1 stop9h 05m

San Francisco

lun. 8/18

7:30 am-12:46 am

1 stop14h 16m

$246

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

mié. 5/21

6:45 am-12:30 pm

1 stop8h 45m

San Francisco

mié. 5/28

1:30 pm-12:37 am

1 stop8h 07m

$249

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

jue. 7/3

5:45 am-1:59 pm

1 stop11h 14m

San Francisco

lun. 7/7

12:50 pm-5:25 am

2 stops13h 35m

$249

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

sáb. 5/24

2:35 pm-8:10 pm

1 stop8h 35m

San Francisco

mié. 5/28

11:25 am-10:07 pm

1 stop7h 42m

$256

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

jue. 5/1

4:30 pm-7:55 pm

Nonstop6h 25m

San Francisco

dom. 5/4

11:25 am-8:05 pm

Nonstop5h 40m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

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

Best time to book a flight from Ontario to San Francisco

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

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

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of $393). 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 ON to SFO?

Find hourly flight availability from Ontario to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 15, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to San Francisco as you normally would.

Weekly flight availability from Region of Ontario to San Francisco

Explore weekly flight availability from Ontario to San Francisco. 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 abril 15, 2025.

The most flights from CAON to SFO 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 (13 on average).

Rainfall in San Francisco by month

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

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

Temperature in San Francisco by month

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

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 San Francisco. Reviews last updated abril 15, 2025.
See what other customers who have flown with Alaska Airlines, Porter Airlines and Delta from Ontario to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,871 reviews

Food

7.1

Crew

8.5

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,871 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Food

7.1

Crew

8.5

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Porter Airlines
8.0
Very good
281 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Food

7.1

Crew

8.5

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,918 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Food

7.1

Crew

8.5

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Air Transat
7.8
Good
385 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Food

7.1

Crew

8.5

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
SWISS
7.5
Good
1,578 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Food

7.1

Crew

8.5

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

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

    If you book a flight to San Francisco from Ontario, you will be flying to San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.8 mi from the center of San Francisco.

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

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at $142. Porter Airlines flights start at $142 while deals on Air Canada start at $157 one-way.

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

    While some choose either Montreal Pierre Elliott Trudeau Intl - San Francisco or Toronto Island - San Francisco, Toronto Pearson Intl - San Francisco is the most popular route from Region of Ontario to San Francisco.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Region of Ontario to San Francisco on time: Brussels Airlines (100%), Porter Airlines (64%), Air Transat (64%).

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

    Looking at all options, your cheapest flight can be booked for $142. While the most popular route (Toronto Pearson Intl - San Francisco) can be booked for $202 on average our data indicates $966 when flying from Region of Ontario to San Francisco.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of $393). 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

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Roseville
Mountain View
Santa Cruz
Turlock
South San Francisco
Fairfield
Manteca
Sausalito
Richmond
Watsonville
Hollister
Milpitas
Antioch
Vallejo
Newark
Hayward
Alameda
Sunnyvale
Livermore
Campbell

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 Ontario to San Francisco

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

Top 7 airlines flying from Ontario to San Francisco

Discover the top 7 airlines that operate flights from Ontario to San Francisco. 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 abril 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$174Average$471FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$241Average$541FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$242Average$443FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$264Average$490FlexibilityNo cancel feeOn-time67%
Air TransatCheapest$265Average$374FlexibilityNo cancel feeOn-time50%
American AirlinesCheapest$288Average$475FlexibilityNo cancel feeOn-time71%
DeltaCheapest$308Average$514FlexibilityNo cancel feeOn-timeN/A

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.