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Cheap flights from San Francisco to Ontario from C$ 123

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 22/10. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 11 September 2025.

Round-trip from

C$ 310

One-way from

C$ 123

Popular in

December

Cheapest in

April

Average price

C$ 625

Good round-trip deal

C$ 513 or less

Good one-way deal

C$ 316 or less
WestJet
  • WestJet
  • 1/10-5/10
  • 2 total stops
  • 17h 44m total
  • San Francisco to Ontario
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22/10
  • 22/10
  • 1 total stop
  • 10h 44m total
  • San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 113 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 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.
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 11 September 2025.

Wed 1/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Sun 5/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Deal found 9/9C$ 310
Sat 11/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Sat 18/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Deal found 8/9C$ 327
Tue 7/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Mon 20/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Deal found 9/9C$ 330
Wed 1/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Wed 8/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Deal found 8/9C$ 334
Fri 17/1012:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Thu 23/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Deal found 9/9C$ 341
Thu 16/1010:15 a.m.SFO - YHM
1 stop10h 44mMultiple Airlines
Mon 20/105:45 p.m.YHM - SFO
1 stop18h 45mMultiple Airlines
Deal found 9/9C$ 342
Tue 30/97:30 a.m.SFO - YHM
1 stop14h 10mWestJet
Thu 2/106:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Deal found 10/9C$ 355
Fri 26/912:50 p.m.SFO - YYZ
2 stops23h 56mWestJet
Tue 30/91:30 p.m.YYZ - SFO
1 stop10h 54mWestJet
Deal found 9/9C$ 356
Sat 27/912:50 p.m.SFO - YYZ
2 stops14h 01mMultiple Airlines
Sat 4/109:45 a.m.YYZ - SFO
Nonstop5h 38mMultiple Airlines
Deal found 8/9C$ 358
Sun 21/97:30 a.m.SFO - YYZ
2 stops14h 01mWestJet
Mon 29/96:30 a.m.YYZ - SFO
1 stop10h 27mWestJet
Deal found 8/9C$ 359
Wed 15/1010:15 a.m.SFO - YHM
1 stop10h 44mMultiple Airlines
Fri 17/105:45 p.m.YHM - SFO
1 stop18h 45mMultiple Airlines
Deal found 10/9C$ 359
Sat 20/97:30 a.m.SFO - YYZ
1 stop8h 22mWestJet
Wed 1/1012:00 p.m.YYZ - SFO
2 stops12h 24mWestJet
Deal found 8/9C$ 360

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 629,999 searches. Data last updated 11 September 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 FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 1/10

12:50 p.m.-12:40 a.m.

1 stop8h 50m

Hamilton

Wed 8/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

C$ 334

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 16/10

10:15 a.m.-12:40 a.m.

2 stops11h 25m

Hamilton

Mon 20/10

5:45 p.m.-9:30 a.m.

1 stop18h 45m

C$ 360

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 8/10

12:50 p.m.-12:40 a.m.

1 stop8h 50m

Hamilton

Mon 20/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

C$ 363

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Fri 17/10

12:50 p.m.-12:40 a.m.

1 stop8h 50m

Hamilton

Sat 25/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

C$ 366

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 1/10

12:50 p.m.-12:40 a.m.

1 stop8h 50m

Hamilton

Tue 14/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

C$ 371

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 10/10

12:50 p.m.-12:45 a.m.

1 stop8h 55m

Toronto Region of Waterloo Intl

Tue 14/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

C$ 376

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Wed 24/9

12:50 p.m.-12:45 a.m.

1 stop8h 55m

Toronto Region of Waterloo Intl

Tue 7/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

C$ 388

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Thu 2/10

12:50 p.m.-12:45 a.m.

1 stop8h 55m

Toronto Region of Waterloo Intl

Mon 6/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

C$ 388

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 1/10

10:15 a.m.-11:59 p.m.

1 stop10h 44m

Hamilton

Sun 5/10

5:45 p.m.-9:30 a.m.

1 stop18h 45m

C$ 392

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 15/10

10:15 a.m.-11:59 p.m.

1 stop10h 44m

Hamilton

Mon 20/10

5:45 p.m.-11:54 a.m.

2 stops21h 09m

C$ 403

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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 C$ 168). Flying from San Francisco to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 11 September 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 11 September 2025.

The most flights from SFO to CAON are scheduled on a Monday (25 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (21 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 11 September 2025.
Get a feel of what it's like to fly with Porter Airlines,Air Transat, andUnited Airlines from San Francisco to Ontario by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
7.9
Good
363 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Transat
7.7
Good
438 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,937 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
WestJet
7.2
Good
3,091 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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?

    San Francisco (SFO) is the airport you will fly out of if you book a flight from San Francisco to Ontario. It is only a 19.0 km journey to San Francisco (SFO) from San Francisco’s city centre.

  • How long is the flight from San Francisco to Region of Ontario?

    For as low as C$ 334, WestJet can have you in Region of Ontario from San Francisco in 8h 50m. Airlines will cover a distance of 3605 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    One-way options have recently been found by users for as low as C$ 134 on WestJet. Other airlines that offer cheap prices include Delta from C$ 237 and Air Canada from C$ 237 one-way.

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

    Most travellers 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?

    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 San Francisco to Region of Ontario on time: Porter Airlines (74%), Air Transat (74%), Brussels Airlines (69%).

  • 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 C$ 573, our data indicates the cheapest price to be C$ 204. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 281.

  • 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 C$ 168). Flying from San Francisco to Region of Ontario in July is currently the most expensive (average of C$ 258). 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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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 5 airlines flying from San Francisco to Ontario

Discover the top 5 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 629,999 searches. Data last updated 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 197AverageC$ 542FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 257AverageC$ 680FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air TransatCheapestC$ 300AverageC$ 646FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
United AirlinesCheapestC$ 316AverageC$ 967FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 321AverageC$ 443FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from San Francisco to Ontario?

When you search for this flight from San Francisco to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from San Francisco to Ontario?

Millions of users choose and trust Cheapflights to book the best flight deals from San Francisco to Ontario for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from San Francisco to Ontario with no change fees?

Yes, we can. To see specific flights from San Francisco to Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from San Francisco to Ontario become cheaper?

Yes, Cheapflights offers price alerts on San Francisco to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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