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$101+ 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 5/1. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. 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 6/56:05 pm
SFO
-
YYZ
1 stop9h 50m
WestJet
Mon 6/83:50 pm
YYZ
-
SFO
1 stop9h 05m
WestJet
Deal found 1/27$249
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Mon 2/232:25 pm
SFO
-
YYZ
1 stop13h 18m
Multiple Airlines
Thu 3/58:35 pm
YYZ
-
SFO
1 stop14h 23m
Multiple Airlines
Deal found 1/27$250
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 5/11:00 pm
SFO
-
YYZ
1 stop8h 10m
WestJet
Mon 5/46:15 am
YYZ
-
SFO
1 stop8h 45m
WestJet
Deal found 1/28$251
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Mon 4/206:45 pm
SFO
-
YYZ
1 stop10h 05m
Multiple Airlines
Thu 4/238:00 pm
YYZ
-
SFO
1 stop15h 18m
Multiple Airlines
Deal found 1/28$252
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Mon 3/22:25 pm
SFO
-
YYZ
1 stop13h 18m
Multiple Airlines
Wed 3/111:30 pm
YYZ
-
SFO
2 stops21h 28m
Multiple Airlines
Deal found 1/28$253
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Mon 2/232:25 pm
SFO
-
YYZ
1 stop13h 18m
Multiple Airlines
Wed 3/49:00 pm
YYZ
-
SFO
1 stop15h 30m
Multiple Airlines
Deal found 1/27$255
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Wed 4/226:45 pm
SFO
-
YYZ
1 stop10h 05m
Multiple Airlines
Tue 4/289:45 am
YYZ
-
SFO
1 stop10h 07m
Multiple Airlines
Deal found 1/28$256
This FlightHub deal was found by Cheapflights users on 1/28. 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.
Sat 5/161:00 pm
SFO
-
YYZ
1 stop9h 05m
WestJet
Wed 5/206:15 am
YYZ
-
SFO
1 stop8h 45m
WestJet
Deal found 1/28$258
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 3/147:32 pm
SFO
-
YYZ
2 stops24h 39m
Multiple Airlines
Fri 3/208:00 pm
YYZ
-
SFO
1 stop15h 49m
Multiple Airlines
Deal found 1/26$259
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Wed 2/257:15 pm
SFO
-
YYZ
2 stops21h 21m
Multiple Airlines
Thu 3/58:35 pm
YYZ
-
SFO
1 stop14h 23m
Multiple Airlines
Deal found 1/27$260
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 3/110:15 am
SFO
-
YYZ
1 stop18h 35m
Multiple Airlines
Thu 3/58:35 pm
YYZ
-
SFO
1 stop14h 23m
Multiple Airlines
Deal found 1/27$263
This oojo deal was found by Cheapflights users on 1/28. 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.
Fri 5/16:00 am
SFO
-
YHM
1 stop8h 15m
WestJet
Sat 5/26:10 pm
YHM
-
SFO
1 stop20h 50m
WestJet
Deal found 1/28$279

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$249
(Kiwi.com)

One-way from

$101
(Jetabroad)

Popular in

December

Cheapest in

February

Average price

$392

Good round-trip deal

$356 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. 12% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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

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 January 29, 2026.
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

Fri 5/1

6:00 am-5:15 pm

1 stop8h 15m

Hamilton

Sat 5/2

6:10 pm-12:00 pm

1 stop20h 50m

$279

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Fri 5/1

6:00 am-5:15 pm

1 stop8h 15m

Hamilton

Mon 5/4

6:10 pm-12:00 pm

1 stop20h 50m

$282

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Tue 5/5

6:00 am-5:15 pm

1 stop8h 15m

Hamilton

Tue 5/12

6:10 pm-12:00 pm

1 stop20h 50m

$302

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Thu 5/21

6:00 am-12:30 pm

2 stops27h 30m

Ottawa

Mon 5/25

6:15 pm-12:00 pm

2 stops20h 45m

$316

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 5/1

6:00 am-7:50 pm

1 stop10h 50m

Toronto Region of Waterloo Intl

Mon 5/4

8:40 pm-12:00 pm

1 stop18h 20m

$328

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Mon 5/4

6:00 am-5:15 pm

1 stop8h 15m

Hamilton

Sun 5/17

6:10 pm-9:55 pm

1 stop30h 45m

$333

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Fri 5/1

6:00 am-5:15 pm

1 stop8h 15m

Hamilton

Sun 5/3

6:10 pm-12:00 pm

1 stop20h 50m

$333

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sat 5/23

6:00 am-5:20 pm

1 stop8h 20m

Ottawa

Tue 6/2

7:00 am-12:20 pm

1 stop8h 20m

$334

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Thu 3/12

1:00 pm-12:40 am

1 stop8h 40m

Ottawa

Thu 3/19

6:00 am-12:10 pm

1 stop9h 10m

$336

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Thu 3/12

1:00 pm-12:40 am

1 stop8h 40m

Ottawa

Thu 3/19

5:40 am-7:58 am

2 stops29h 18m

$352

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of $127). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of $203). 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 January 29, 2026.

One of the essential ways to save on airfare from San Francisco to Region of Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 39% on airfare.

What is the cheapest day to fly from San Francisco to Region of Ontario?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Ontario. Price data was last updated on January 24, 2026.

Travelers seeking maximum savings on their San Francisco to Region of Ontario flight should consider departing on Thursday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 January 29, 2026.

The most flights from SFO to CAON are scheduled on a Monday (18 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 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 January 29, 2026.
Peruse reviews from past customers who have flown with Porter Airlines, Delta, 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
412 reviews

Comfort

7.9

Crew

8.6

Food

7.5

Overall

7.9

Boarding

8.2

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Porter Airlines
7.9
Good
412 reviews
Porter Airlines
7.9
Good
412 reviews

Comfort

7.9

Crew

8.6

Food

7.5

Overall

7.9

Boarding

8.2

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Delta
7.9
Good
8,127 reviews
Porter Airlines
7.9
Good
412 reviews

Comfort

7.9

Crew

8.6

Food

7.5

Overall

7.9

Boarding

8.2

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
United Airlines
7.4
Good
9,215 reviews
Porter Airlines
7.9
Good
412 reviews

Comfort

7.9

Crew

8.6

Food

7.5

Overall

7.9

Boarding

8.2

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
WestJet
7.2
Good
3,253 reviews
Porter Airlines
7.9
Good
412 reviews

Comfort

7.9

Crew

8.6

Food

7.5

Overall

7.9

Boarding

8.2

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Air Canada
7.1
Good
10,667 reviews
Porter Airlines
7.9
Good
412 reviews

Comfort

7.9

Crew

8.6

Food

7.5

Overall

7.9

Boarding

8.2

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out

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, Air Canada, and Alaska Airlines fly from San Francisco to Region of Ontario in about 8h 15m. The time it takes to get you to your destination can typically vary by up to 16h 46m. 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 $103. Flair Airlines flights start at $104 while deals on Porter Airlines start at $114 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: United Airlines (69%), Air Canada (69%), Singapore Airlines( 68%).

  • 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 $1,138, our data indicates the cheapest price to be $142. The most popular route (San Francisco - Toronto Pearson Intl), is priced around $255.

  • 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, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of $127). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of $203). 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

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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$136Average$516FlexibilityNo cancel feeOn-time67%
WestJetCheapest$146Average$392FlexibilityNo cancel feeOn-time60%
Porter AirlinesCheapest$154Average$397FlexibilityNo cancel feeOn-time52%
Air TransatCheapest$165Average$437FlexibilityNo cancel feeOn-time50%
United AirlinesCheapest$192Average$498FlexibilityNo cancel feeOn-time69%
DeltaCheapest$195Average$471FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$403Average$587FlexibilityNo cancel feeOn-time71%

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