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Cheap flights from San Francisco to Ontario from C$ 173

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 22/4. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
25 Feb — 4 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap 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 26 January 2026.

Sat 14/37:32 p.m.
SFO
-
YYZ
1 stop7h 48m
Multiple Airlines
Mon 23/38:00 p.m.
YYZ
-
SFO
1 stop25h 37m
Multiple Airlines
Deal found 25/1C$ 356
Thu 12/310:15 a.m.
SFO
-
YYZ
1 stop17h 25m
Multiple Airlines
Mon 23/38:00 p.m.
YYZ
-
SFO
1 stop25h 37m
Multiple Airlines
Deal found 25/1C$ 357
Wed 25/27:15 p.m.
SFO
-
YYZ
2 stops21h 21m
Multiple Airlines
Wed 4/39:00 p.m.
YYZ
-
SFO
1 stop15h 30m
Multiple Airlines
Deal found 26/1C$ 363
Fri 1/512:50 p.m.
SFO
-
YKF
1 stop8h 55m
WestJet
Tue 5/56:00 a.m.
YKF
-
SFO
1 stop8h 54m
WestJet
Deal found 24/1C$ 364
Wed 25/27:15 p.m.
SFO
-
YYZ
2 stops21h 21m
Multiple Airlines
Thu 5/38:35 p.m.
YYZ
-
SFO
1 stop14h 23m
Multiple Airlines
Deal found 25/1C$ 364
Mon 4/512:50 p.m.
SFO
-
YKF
1 stop8h 55m
WestJet
Fri 8/56:00 a.m.
YKF
-
SFO
1 stop8h 54m
WestJet
Deal found 24/1C$ 367
Fri 1/512:50 p.m.
SFO
-
YKF
1 stop8h 55m
WestJet
Sun 10/56:00 a.m.
YKF
-
SFO
1 stop8h 54m
WestJet
Deal found 24/1C$ 368
Fri 1/512:50 p.m.
SFO
-
YYZ
2 stops14h 00m
WestJet
Tue 5/51:30 p.m.
YYZ
-
SFO
1 stop10h 54m
WestJet
Deal found 24/1C$ 374
Fri 5/66:05 p.m.
SFO
-
YYZ
1 stop9h 07m
WestJet
Sun 7/69:00 a.m.
YYZ
-
SFO
2 stops11h 14m
WestJet
Deal found 24/1C$ 377
Tue 2/66:05 p.m.
SFO
-
YYZ
1 stop9h 07m
WestJet
Fri 5/612:00 p.m.
YYZ
-
SFO
2 stops12h 24m
WestJet
Deal found 24/1C$ 378
Tue 12/512:50 p.m.
SFO
-
YYZ
1 stop8h 32m
WestJet
Mon 18/59:00 a.m.
YYZ
-
SFO
2 stops11h 14m
WestJet
Deal found 24/1C$ 379
Sun 12/410:37 p.m.
SFO
-
YYZ
1 stop29h 06m
Multiple Airlines
Sat 18/49:50 a.m.
YYZ
-
SFO
Nonstop5h 55m
Multiple Airlines
Deal found 25/1C$ 381

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 26 January 2026.

Round-trip from

C$ 356

One-way from

C$ 173

Popular in

December

Cheapest in

February

Average price

C$ 537

Good round-trip deal

C$ 397 or less

Good one-way deal

C$ 231 or less
14/3-23/3
  • 14/3-23/3
  • 2 total stops
  • 33h 25m total
  • San Francisco to Ontario
Search Deals
22/4
  • 22/4
  • 1 total stop
  • 18h 42m total
  • San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 111 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 35 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 629,999 searches. Data last updated 26 January 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 FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sat 23/5

12:50 p.m.-5:28 a.m.

2 stops13h 38m

Ottawa

Tue 2/6

6:15 a.m.-5:14 p.m.

2 stops13h 59m

C$ 434

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sat 23/5

12:50 p.m.-5:28 a.m.

2 stops13h 38m

Ottawa

Tue 26/5

6:15 a.m.-5:14 p.m.

2 stops13h 59m

C$ 434

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$ 490

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sun 31/5

6:00 a.m.-5:20 p.m.

1 stop8h 20m

Ottawa

Thu 4/6

7:00 a.m.-12:20 p.m.

1 stop8h 20m

C$ 497

San FranciscoToronto

SFO - YTZ

SFOYTZ

San Francisco

Tue 10/3

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

1 stop10h 10m

Toronto Island

Tue 17/3

10:25 a.m.-9:22 p.m.

2 stops13h 57m

C$ 499

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sat 23/5

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

1 stop8h 50m

Ottawa

Tue 26/5

7:00 a.m.-12:20 p.m.

1 stop8h 20m

C$ 503

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sun 31/5

6:00 a.m.-5:20 p.m.

1 stop8h 20m

Ottawa

Thu 4/6

12:25 p.m.-9:55 p.m.

2 stops12h 30m

C$ 504

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 19/3

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

1 stop21h 21m

Hamilton

Mon 23/3

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

1 stop21h 00m

C$ 512

San FranciscoMontreal

SFO - YUL

SFOYUL

San Francisco

Wed 1/4

1:45 p.m.-12:35 a.m.

1 stop7h 50m

Montreal Pierre Elliott Trudeau Intl

Wed 8/4

6:45 a.m.-12:45 p.m.

1 stop9h 00m

C$ 522

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Fri 17/4

6:45 p.m.-2:44 p.m.

1 stop16h 59m

Ottawa

Sun 19/4

6:00 a.m.-12:10 p.m.

1 stop9h 10m

C$ 525

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/1

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$ 174). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of C$ 278). 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 26 January 2026.

It’s optimal to fly from San Francisco to Region of Ontario in the evening. By choosing this option you can save up to 18% on the cost of your flight, compared to a flight at noon.

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 24 January 2026.

Travelers seeking maximum savings on their San Francisco to Region of Ontario flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday evenings 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 26 January 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 26 January 2026.
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
412 reviews
Check prices

Comfort

7.9

Boarding

8.2

Overall

7.9

Entertainment

6.9

Crew

8.6

Food

7.5

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
Check prices

Comfort

7.9

Boarding

8.2

Overall

7.9

Entertainment

6.9

Crew

8.6

Food

7.5

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 Transat
7.7
Good
501 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Comfort

7.9

Boarding

8.2

Overall

7.9

Entertainment

6.9

Crew

8.6

Food

7.5

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
9,199 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Comfort

7.9

Boarding

8.2

Overall

7.9

Entertainment

6.9

Crew

8.6

Food

7.5

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
3,249 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Comfort

7.9

Boarding

8.2

Overall

7.9

Entertainment

6.9

Crew

8.6

Food

7.5

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
10,656 reviews
Porter Airlines
7.9
Good
412 reviews
Check prices

Comfort

7.9

Boarding

8.2

Overall

7.9

Entertainment

6.9

Crew

8.6

Food

7.5

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?

    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$ 522, WestJet can have you in Region of Ontario from San Francisco in 7h 50m. Airlines will cover a distance of 4073 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$ 116 on WestJet. Other airlines that offer cheap prices include United Airlines from C$ 167 and Air Canada from C$ 167 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: 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 C$ 392, our data indicates the cheapest price to be C$ 173. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 351.

  • 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$ 174). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of C$ 278). 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 26 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 195AverageC$ 526FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 241AverageC$ 651FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 286AverageC$ 440FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 306AverageC$ 802FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air TransatCheapestC$ 500AverageC$ 880FlexibilityNo cancel feeOn-time50%
Search Air Transat 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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