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Cheap flights from San Francisco to Ontario from C$ 158

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 25/5. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
4 May — 11 May1
1 adult

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 29 April 2025.

Round-trip from

C$ 346

One-way from

C$ 158

Popular in

December

Cheapest in

February

Average price

C$ 545

Good round-trip deal

C$ 506 or less

Good one-way deal

C$ 229 or less
27/5-11/6
  • 27/5-11/6
  • 3 total stops
  • 38h 32m total
  • San Francisco to Ontario
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25/5
  • 25/5
  • 1 total stop
  • 11h 10m total
  • San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 81 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 30 potential savings vs. average RT price).
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Average for round-trip flights in April 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.
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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 29 April 2025.

Tue 27/51:09 p.m.SFO - YYZ
1 stop25h 11mMultiple Airlines
Wed 11/611:00 a.m.YYZ - SFO
2 stops13h 21mMultiple Airlines
Deal found 27/4C$ 346
Thu 10/77:30 a.m.SFO - YKF
1 stop8h 26mWestJet
Tue 15/76:00 a.m.YKF - SFO
2 stops10h 59mWestJet
Deal found 28/4C$ 352
Sun 6/77:30 a.m.SFO - YYZ
2 stops14h 03mWestJet
Thu 10/76:30 a.m.YYZ - SFO
1 stop8h 35mWestJet
Deal found 27/4C$ 374
Sun 10/812:50 p.m.SFO - YHM
1 stop8h 51mWestJet
Thu 14/86:00 a.m.YHM - SFO
2 stops10h 59mWestJet
Deal found 28/4C$ 377
Sun 3/86:05 p.m.SFO - YOW
1 stop9h 40mWestJet
Wed 6/85:45 a.m.YOW - SFO
1 stop11h 14mWestJet
Deal found 28/4C$ 395
Sat 17/52:03 p.m.SFO - YOW
1 stop26h 52mMultiple Airlines
Wed 21/512:20 p.m.YOW - SFO
2 stops12h 05mMultiple Airlines
Deal found 26/4C$ 403
Tue 10/610:15 a.m.SFO - YKF
2 stops40h 15mFlair Airlines
Thu 12/69:25 a.m.YKF - SFO
1 stop27h 05mFlair Airlines
Deal found 28/4C$ 423
Tue 22/712:50 p.m.SFO - YUL
1 stop8h 53mMultiple Airlines
Tue 29/77:00 a.m.YUL - SFO
2 stops19h 57mMultiple Airlines
Deal found 27/4C$ 425
Wed 20/812:50 p.m.SFO - YUL
1 stop8h 53mWestJet
Wed 27/87:00 a.m.YUL - SFO
1 stop13h 15mWestJet
Deal found 27/4C$ 431
Tue 10/62:45 p.m.SFO - YKF
3 stops35h 45mMultiple Airlines
Thu 12/69:25 a.m.YKF - SFO
1 stop27h 05mMultiple Airlines
Deal found 28/4C$ 434
Wed 28/51:09 p.m.SFO - YHM
2 stops32h 32mMultiple Airlines
Wed 4/66:00 a.m.YHM - SFO
1 stop9h 05mMultiple Airlines
Deal found 28/4C$ 445
Wed 4/610:15 a.m.SFO - YTZ
2 stops30h 22mMultiple Airlines
Fri 6/63:35 p.m.YTZ - SFO
2 stops20h 55mMultiple Airlines
Deal found 28/4C$ 478

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 29 April 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 - YYZ

SFOYYZ

San Francisco

Tue 27/5

1:09 p.m.-5:20 p.m.

1 stop25h 11m

Toronto Pearson Intl

Wed 11/6

11:00 a.m.-9:21 p.m.

2 stops13h 21m

C$ 346

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Thu 10/7

7:30 a.m.-6:56 p.m.

1 stop8h 26m

Toronto Region of Waterloo Intl

Tue 15/7

6:00 a.m.-1:59 p.m.

2 stops10h 59m

C$ 352

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Thu 7/8

12:50 p.m.-12:41 a.m.

1 stop8h 51m

Hamilton

Mon 11/8

6:00 a.m.-11:56 a.m.

1 stop8h 56m

C$ 371

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Thu 11/9

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

1 stop17h 55m

Toronto Region of Waterloo Intl

Mon 15/9

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

1 stop8h 54m

C$ 373

San FranciscoToronto

SFO - YYZ

SFOYYZ

San Francisco

Sun 6/7

7:30 a.m.-12:33 a.m.

2 stops14h 03m

Toronto Pearson Intl

Thu 10/7

6:30 a.m.-12:05 p.m.

1 stop8h 35m

C$ 374

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sun 3/8

6:05 p.m.-6:45 a.m.

1 stop9h 40m

Ottawa

Wed 6/8

5:45 a.m.-1:59 p.m.

1 stop11h 14m

C$ 395

San FranciscoOttawa

SFO - YOW

SFOYOW

San Francisco

Sat 17/5

2:03 p.m.-7:55 p.m.

1 stop26h 52m

Ottawa

Wed 21/5

12:20 p.m.-9:25 p.m.

2 stops12h 05m

C$ 403

San FranciscoMontreal

SFO - YUL

SFOYUL

San Francisco

Tue 22/7

12:50 p.m.-12:43 a.m.

1 stop8h 53m

Montreal Pierre Elliott Trudeau Intl

Tue 29/7

7:00 a.m.-11:57 p.m.

2 stops19h 57m

C$ 425

San FranciscoToronto

SFO - YKF

SFOYKF

San Francisco

Thu 29/5

10:15 a.m.-5:30 a.m.

2 stops40h 15m

Toronto Region of Waterloo Intl

Mon 2/6

9:25 a.m.-9:30 a.m.

1 stop27h 05m

C$ 430

San FranciscoHamilton

SFO - YHM

SFOYHM

San Francisco

Wed 4/6

10:15 a.m.-7:59 p.m.

1 stop30h 44m

Hamilton

Wed 11/6

7:15 p.m.-12:05 p.m.

1 stop19h 50m

C$ 432

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/4

Showing 1-10 of 56 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$ 167). 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 29 April 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 29 April 2025.

The most flights from SFO to CAON are scheduled on a Monday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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 29 April 2025.
Read through reviews of airlines operating flights from San Francisco to Ontario, such as Alaska Airlines, Porter Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,949 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Porter Airlines
8.0
Very good
285 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Air Transat
7.8
Good
385 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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$ 173 on WestJet. Other airlines that offer cheap prices include Flair Airlines from C$ 193 and Alaska Airlines from C$ 262 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 (88%), Air Canada (75%), United Airlines (72%).

  • 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$ 397, our data indicates the cheapest price to be C$ 169. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 340.

  • 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$ 167). 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 29 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 298AverageC$ 558FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Air CanadaCheapestC$ 312AverageC$ 744FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 316AverageC$ 965FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 321AverageC$ 531FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Porter AirlinesCheapestC$ 400AverageC$ 646FlexibilityNo cancel feeOn-time52%
Search Porter 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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