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Cheap flights from San Francisco to Ontario from C$ 192

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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
26 Nov — 3 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from San Francisco to Ontario

Enter your travel dates to find the best prices.

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 27 October 2025.

Thu 11/1210:15 a.m.SFO - YYZ
1 stop10h 39mMultiple Airlines
Sun 11/18:00 p.m.YYZ - SFO
1 stop14h 48mMultiple Airlines
Deal found 26/10C$ 386
Mon 15/124:59 p.m.SFO - YYZ
1 stop10h 48mMultiple Airlines
Sun 11/18:00 p.m.YYZ - SFO
1 stop14h 48mMultiple Airlines
Deal found 26/10C$ 389
Tue 16/126:00 a.m.SFO - YYZ
1 stop10h 55mMultiple Airlines
Sun 11/18:00 p.m.YYZ - SFO
1 stop14h 48mMultiple Airlines
Deal found 26/10C$ 393
Mon 15/124:59 p.m.SFO - YYZ
1 stop10h 48mMultiple Airlines
Thu 8/19:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 26/10C$ 396
Thu 4/1210:15 a.m.SFO - YYZ
1 stop11h 23mMultiple Airlines
Wed 10/129:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 26/10C$ 397
Sat 6/1210:15 a.m.SFO - YYZ
1 stop11h 23mMultiple Airlines
Wed 10/129:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 26/10C$ 399
Sun 14/1210:15 a.m.SFO - YYZ
1 stop10h 39mMultiple Airlines
Thu 8/19:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 26/10C$ 402
Thu 11/128:43 a.m.SFO - YYZ
1 stop8h 49mMultiple Airlines
Thu 8/19:35 a.m.YYZ - SFO
1 stop10h 16mMultiple Airlines
Deal found 26/10C$ 403
Thu 4/1210:15 a.m.SFO - YYZ
2 stops17h 43mMultiple Airlines
Mon 8/129:00 p.m.YYZ - SFO
1 stop15h 30mMultiple Airlines
Deal found 27/10C$ 404
Mon 17/1110:00 p.m.SFO - YYZ
1 stop18h 55mMultiple Airlines
Sun 23/117:55 p.m.YYZ - SFO
1 stop21h 06mMultiple Airlines
Deal found 27/10C$ 407
Sun 14/1210:15 a.m.SFO - YYZ
1 stop10h 39mMultiple Airlines
Tue 13/19:35 a.m.YYZ - SFO
1 stop9h 18mMultiple Airlines
Deal found 26/10C$ 409
Mon 17/118:25 a.m.SFO - YTZ
1 stop8h 30mAir Canada
Sun 23/113:30 p.m.YTZ - SFO
1 stop8h 52mAir Canada
Deal found 25/10C$ 469

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 27 October 2025.

Round-trip from

C$ 372

One-way from

C$ 192

Popular in

December

Cheapest in

April

Average price

C$ 589

Good round-trip deal

C$ 363 or less

Good one-way deal

C$ 225 or less
23/2-26/2
  • 23/2-26/2
  • 2 total stops
  • 24h 57m total
  • San Francisco to Ontario
Search Deals
11/12
  • 11/12
  • 2 total stops
  • 27h 33m total
  • San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 97 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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

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 27 October 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

Fri 16/1

1:00 p.m.-5:28 a.m.

1 stop13h 28m

Toronto Region of Waterloo Intl

Thu 22/1

6:20 a.m.-12:12 p.m.

1 stop8h 52m

C$ 396

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Fri 20/3

1:00 p.m.-5:29 a.m.

1 stop13h 29m

Toronto Region of Waterloo Intl

Tue 24/3

6:20 a.m.-12:10 p.m.

1 stop8h 50m

C$ 465

San FranciscoToronto

SFO - YTZ

SFOYTZ

San Francisco

Mon 17/11

8:25 a.m.-9:35 p.m.

1 stop10h 10m

Toronto Island

Mon 24/11

3:30 p.m.-9:22 p.m.

1 stop8h 52m

C$ 483

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 4/12

10:15 a.m.-7:00 p.m.

1 stop29h 45m

Hamilton

Wed 10/12

8:15 a.m.-9:30 a.m.

1 stop28h 15m

C$ 497

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 19/3

1:00 p.m.-1:21 p.m.

1 stop21h 21m

Hamilton

Tue 24/3

5:50 a.m.-12:10 p.m.

1 stop9h 20m

C$ 501

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 12/2

1:00 p.m.-1:21 p.m.

1 stop21h 21m

Hamilton

Mon 23/2

6:10 p.m.-12:10 p.m.

1 stop21h 00m

C$ 502

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 19/2

1:00 p.m.-1:21 p.m.

1 stop21h 21m

Hamilton

Tue 24/2

5:50 a.m.-12:10 p.m.

1 stop9h 20m

C$ 521

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Mon 24/11

9:26 p.m.-3:35 p.m.

1 stop15h 09m

Toronto Pearson Intl

Tue 2/12

4:45 p.m.-11:00 a.m.

1 stop21h 15m

C$ 535

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Thu 29/1

8:49 a.m.-4:52 p.m.

Nonstop5h 03m

Toronto Pearson Intl

Sat 14/2

5:55 p.m.-8:55 p.m.

Nonstop6h 00m

C$ 550

San FranciscoToronto

SFO - YTZ

SFOYTZ

San Francisco

Thu 4/12

8:25 a.m.-9:35 p.m.

1 stop10h 10m

Toronto Island

Wed 10/12

3:30 p.m.-9:22 p.m.

1 stop8h 52m

C$ 556

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

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, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of C$ 178). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of C$ 284). 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 27 October 2025.

It’s optimal to fly from San Francisco to Region of Ontario in the afternoon. By choosing this option you can save up to 40% on the cost of your flight, compared to a flight in the morning.

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 16 December 2024.

Travelers seeking maximum savings on their San Francisco to Region of Ontario flight should consider departing on Friday mornings when fares are most often at their lowest. Monday mornings 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 27 October 2025.

The most flights from SFO to CAON are scheduled on a Monday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 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 27 October 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
8.0
Very good
384 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.0

Boarding

8.2

Crew

8.6

Food

7.6

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
8.0
Very good
384 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.0

Boarding

8.2

Crew

8.6

Food

7.6

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
7.8
Good
469 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.0

Boarding

8.2

Crew

8.6

Food

7.6

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
8,999 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.0

Boarding

8.2

Crew

8.6

Food

7.6

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
3,147 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.0

Boarding

8.2

Crew

8.6

Food

7.6

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
10,367 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.0

Boarding

8.2

Crew

8.6

Food

7.6

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$ 483, WestJet can have you in Region of Ontario from San Francisco in 10h 10m. Airlines will cover a distance of 3644 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$ 197 on WestJet. Other airlines that offer cheap prices include Alaska Airlines from C$ 221 and Air Canada from C$ 263 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: Air Canada (75%), United Airlines (75%), Porter Airlines (74%).

  • 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$ 377, our data indicates the cheapest price to be C$ 180. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 372.

  • 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 C$ 178). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of C$ 284). 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 27 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 199AverageC$ 546FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 257AverageC$ 683FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 293AverageC$ 449FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air TransatCheapestC$ 303AverageC$ 839FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
United AirlinesCheapestC$ 499AverageC$ 975FlexibilityNo cancel feeOn-time69%
Search United Airlines 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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