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Cheap flights from San Francisco to Ontario from C$ 121

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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
11 Jan — 18 Jan1
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 12 December 2025.

Tue 16/126:00 a.m.SFO - YYZ
2 stops34h 36mMultiple Airlines
Thu 15/19:45 a.m.YYZ - SFO
Nonstop5h 53mMultiple Airlines
Deal found 10/12C$ 531
Sun 14/128:43 a.m.SFO - YYZ
1 stop8h 12mMultiple Airlines
Mon 5/110:15 p.m.YYZ - SFO
2 stops40h 39mMultiple Airlines
Deal found 11/12C$ 582
Wed 17/126:00 a.m.SFO - YYZ
1 stop10h 55mMultiple Airlines
Tue 6/18:30 p.m.YYZ - SFO
2 stops29h 29mMultiple Airlines
Deal found 10/12C$ 589
Fri 26/121:40 p.m.SFO - YYZ
Nonstop4h 59mMultiple Airlines
Mon 12/17:55 p.m.YYZ - SFO
1 stop28h 50mMultiple Airlines
Deal found 11/12C$ 623
Wed 24/1211:20 p.m.SFO - YYZ
2 stops15h 38mMultiple Airlines
Mon 12/17:55 p.m.YYZ - SFO
1 stop15h 52mMultiple Airlines
Deal found 10/12C$ 625
Thu 25/121:40 p.m.SFO - YYZ
Nonstop4h 59mMultiple Airlines
Mon 12/17:55 p.m.YYZ - SFO
1 stop28h 50mMultiple Airlines
Deal found 10/12C$ 629
Wed 17/126:00 a.m.SFO - YYZ
1 stop10h 55mMultiple Airlines
Mon 5/110:50 a.m.YYZ - SFO
1 stop29h 03mMultiple Airlines
Deal found 10/12C$ 630
Thu 25/121:40 p.m.SFO - YYZ
Nonstop4h 59mMultiple Airlines
Wed 7/11:30 p.m.YYZ - SFO
2 stops21h 23mMultiple Airlines
Deal found 10/12C$ 634
Wed 31/129:30 p.m.SFO - YYZ
1 stop9h 06mUnited Airlines
Wed 7/12:45 p.m.YYZ - SFO
1 stop11h 12mUnited Airlines
Deal found 10/12C$ 640
Fri 12/128:43 a.m.SFO - YYZ
1 stop8h 49mMultiple Airlines
Tue 6/19:35 a.m.YYZ - SFO
2 stops29h 19mMultiple Airlines
Deal found 9/12C$ 643
Tue 30/121:40 p.m.SFO - YOW
1 stop8h 01mMultiple Airlines
Thu 15/16:00 a.m.YOW - SFO
1 stop9h 12mMultiple Airlines
Deal found 10/12C$ 741
Wed 31/128:22 a.m.SFO - YUL
1 stop13h 08mMultiple Airlines
Tue 6/17:30 p.m.YUL - SFO
2 stops39h 23mMultiple Airlines
Deal found 10/12C$ 787

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 12 December 2025.

Round-trip from

C$ 390

One-way from

C$ 121

Popular in

December

Cheapest in

February

Average price

C$ 888

Good round-trip deal

C$ 328 or less

Good one-way deal

C$ 363 or less
WestJet
  • WestJet
  • 22/1-27/1
  • 2 total stops
  • 30h 49m total
  • San Francisco to Ontario
Search Deals
7/2
  • 7/2
  • 1 total stop
  • 10h 20m total
  • San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 128 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 12 December 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

Thu 22/1

1:00 p.m.-1:22 p.m.

1 stop21h 22m

Hamilton

Tue 27/1

5:45 a.m.-12:12 p.m.

1 stop9h 27m

C$ 390

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 22/1

1:00 p.m.-1:22 p.m.

1 stop21h 22m

Hamilton

Mon 26/1

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

1 stop21h 02m

C$ 390

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 8/1

1:00 p.m.-1:22 p.m.

1 stop21h 22m

Hamilton

Tue 13/1

5:45 a.m.-12:12 p.m.

1 stop9h 27m

C$ 390

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 22/1

1:00 p.m.-1:22 p.m.

1 stop21h 22m

Hamilton

Thu 29/1

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

1 stop21h 02m

C$ 404

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 5/2

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

1 stop21h 21m

Hamilton

Mon 9/2

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

1 stop21h 00m

C$ 407

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sun 25/1

1:00 p.m.-12:40 a.m.

1 stop8h 40m

Ottawa

Thu 29/1

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

1 stop9h 12m

C$ 410

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Sun 11/1

1:00 p.m.-5:17 p.m.

1 stop25h 17m

Hamilton

Tue 13/1

5:45 a.m.-12:12 p.m.

1 stop9h 27m

C$ 411

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 5/2

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

1 stop21h 21m

Hamilton

Sun 8/2

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

1 stop21h 00m

C$ 423

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Thu 8/1

1:40 p.m.-12:43 a.m.

1 stop8h 03m

Ottawa

Thu 15/1

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

1 stop9h 12m

C$ 448

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 14/1

2:24 p.m.-5:17 p.m.

2 stops23h 53m

Hamilton

Tue 20/1

5:45 a.m.-12:12 p.m.

1 stop9h 27m

C$ 462

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

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$ 175). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of C$ 279). 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 12 December 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 37% 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 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 12 December 2025.

The most flights from SFO to CAON are scheduled on a Friday (23 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (15 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 12 December 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
398 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

7.9

Crew

8.6

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

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

7.9

Crew

8.6

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
7.8
Good
480 reviews
Porter Airlines
8.0
Very good
398 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

7.9

Crew

8.6

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
9,093 reviews
Porter Airlines
8.0
Very good
398 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

7.9

Crew

8.6

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
3,195 reviews
Porter Airlines
8.0
Very good
398 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

7.9

Crew

8.6

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
10,517 reviews
Porter Airlines
8.0
Very good
398 reviews
Check prices

Food

7.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Comfort

7.9

Crew

8.6

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$ 434, WestJet can have you in Region of Ontario from San Francisco in 7h 55m. 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 Air Canada from C$ 164 and United Airlines from C$ 168 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: Brussels Airlines (100%), United Airlines (88%), Air Canada (88%).

  • 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$ 501, our data indicates the cheapest price to be C$ 217. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 336.

  • 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$ 175). Flying from San Francisco to Region of Ontario in August is currently the most expensive (average of C$ 279). 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 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 196AverageC$ 533FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 257AverageC$ 690FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 288AverageC$ 443FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air TransatCheapestC$ 299AverageC$ 828FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
United AirlinesCheapestC$ 492AverageC$ 855FlexibilityNo 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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