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$108+ 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 6/24. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$243
(Mytrip)

One-way from

$108
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$426

Good round-trip deal

$427 or less

Good one-way deal

$202 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 ($57 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 June 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 junio 12, 2025.

This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/810:15 amSFO - YYZ
1 stop18h 00mFlair Airlines
mié. 11/128:00 pmYYZ - SFO
1 stop16h 30mFlair Airlines
Deal found 6/11$243
This FlightHub deal was found by Cheapflights users on 6/12. 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.
jue. 8/147:30 amSFO - YKF
1 stop8h 26mWestJet
dom. 8/246:00 amYKF - SFO
2 stops10h 59mWestJet
Deal found 6/12$244
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/237:30 amSFO - YYZ
2 stops14h 03mWestJet
mié. 8/63:00 pmYYZ - SFO
1 stop9h 25mWestJet
Deal found 6/11$253
This Trip.com deal was found by Cheapflights users on 6/10. 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.
mié. 8/612:50 pmSFO - YHM
1 stop8h 51mWestJet
lun. 8/186:00 amYHM - SFO
1 stop8h 56mWestJet
Deal found 6/10$262
This Kiwi.com deal was found by Cheapflights users on 6/12. 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.
mié. 7/307:30 amSFO - YYZ
2 stops14h 03mMultiple Airlines
mié. 8/209:45 amYYZ - SFO
Nonstop5h 38mMultiple Airlines
Deal found 6/12$263
This Mytrip deal was found by Cheapflights users on 6/9. 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.
vie. 7/1110:15 amSFO - YKF
1 stop17h 55mFlair Airlines
lun. 7/148:25 pmYKF - SFO
1 stop16h 05mFlair Airlines
Deal found 6/9$289
This Trip.com deal was found by Cheapflights users on 6/11. 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.
dom. 7/136:05 pmSFO - YXU
1 stop8h 09mWestJet
dom. 7/208:00 pmYXU - SFO
1 stop28h 25mWestJet
Deal found 6/11$296
This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
sáb. 9/201:25 pmSFO - YYZ
Nonstop4h 59mPorter Airlines
mié. 10/89:45 amYYZ - SFO
Nonstop5h 38mPorter Airlines
Deal found 6/10$302
This Mytrip deal was found by Cheapflights users on 6/10. 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.
sáb. 8/1610:15 amSFO - YKF
1 stop17h 55mMultiple Airlines
dom. 8/246:00 amYKF - SFO
1 stop8h 56mMultiple Airlines
Deal found 6/10$310
This Mytrip deal was found by Cheapflights users on 6/10. 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.
lun. 8/1110:15 amSFO - YHM
1 stop27h 29mMultiple Airlines
lun. 8/186:00 amYHM - SFO
1 stop8h 56mMultiple Airlines
Deal found 6/10$317
This oojo deal was found by Cheapflights users on 6/11. 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.
jue. 8/147:30 amSFO - YOW
1 stop20h 15mWestJet
lun. 8/185:45 amYOW - SFO
1 stop11h 14mWestJet
Deal found 6/11$317
This Air Canada deal was found by Cheapflights users on 6/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/94:35 pmSFO - YXU
2 stops13h 42mAir Canada
vie. 9/266:15 amYXU - SFO
1 stop9h 43mAir Canada
Deal found 6/10$320

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 junio 12, 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

jue. 8/14

7:30 am-6:56 pm

1 stop8h 26m

Toronto Region of Waterloo Intl

dom. 8/24

6:00 am-1:59 pm

2 stops10h 59m

$244

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

mié. 7/23

7:30 am-12:33 am

2 stops14h 03m

Toronto Pearson Intl

mié. 8/6

3:00 pm-9:25 pm

1 stop9h 25m

$253

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

mié. 8/6

12:50 pm-12:41 am

1 stop8h 51m

Hamilton

lun. 8/18

6:00 am-11:56 am

1 stop8h 56m

$262

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

mié. 7/30

7:30 am-12:33 am

2 stops14h 03m

Toronto Pearson Intl

mié. 8/20

9:45 am-12:23 pm

Nonstop5h 38m

$263

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

vie. 7/11

10:15 am-7:10 am

1 stop17h 55m

Toronto Region of Waterloo Intl

lun. 7/14

8:25 pm-9:30 am

1 stop16h 05m

$289

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

dom. 7/13

6:05 pm-5:14 am

1 stop8h 09m

London

dom. 7/20

8:00 pm-9:25 pm

1 stop28h 25m

$296

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

sáb. 8/16

10:15 am-7:10 am

1 stop17h 55m

Toronto Region of Waterloo Intl

dom. 8/24

6:00 am-11:56 am

1 stop8h 56m

$310

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

lun. 8/11

10:15 am-4:44 pm

1 stop27h 29m

Hamilton

lun. 8/18

6:00 am-11:56 am

1 stop8h 56m

$317

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

jue. 8/14

7:30 am-6:45 am

1 stop20h 15m

Ottawa

lun. 8/18

5:45 am-1:59 pm

1 stop11h 14m

$317

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

mar. 9/9

4:35 pm-9:17 am

2 stops13h 42m

London

vie. 9/26

6:15 am-12:58 pm

1 stop9h 43m

$320

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 $353). 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 junio 12, 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 junio 12, 2025.

The most flights from SFO to CAON are scheduled on a Monday (28 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (22 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 junio 12, 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
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Porter Airlines
8.0
Very good
288 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Air Transat
7.8
Good
396 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.

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 Porter Airlines, which is currently one of the cheapest options available, starting at $108. WestJet flights start at $119 while deals on Air Canada start at $123 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: Brussels Airlines (100%), Austrian Airlines (88%), Singapore Airlines( 86%).

  • 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 $1,735, our data indicates the cheapest price to be $153. The most popular route (San Francisco - Toronto Pearson Intl), is priced around $243.

  • 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 $353). 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$136Average$575FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$160Average$417FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$186Average$533FlexibilityNo cancel feeOn-time69%
DeltaCheapest$187Average$498FlexibilityNo cancel feeOn-timeN/A
Air TransatCheapest$195Average$411FlexibilityNo cancel feeOn-time50%
WestJetCheapest$229Average$411FlexibilityNo cancel feeOn-time60%
American AirlinesCheapest$245Average$585FlexibilityNo cancel feeOn-time71%

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