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Cheap flights from Ontario to San Francisco from C$ 193

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 15/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
17 Jun — 24 Jun1
1 adult

Cheap flight deals from Ontario to San Francisco

Keep the following information in mind while searching for Ontario to San Francisco flight deals. Data was last updated 12 June 2025.

Round-trip from

C$ 323

One-way from

C$ 193

Popular in

December

Cheapest in

April

Average price

C$ 515

Good round-trip deal

C$ 592 or less

Good one-way deal

C$ 310 or less
WestJet
  • WestJet
  • 11/8-13/8
  • 2 total stops
  • 17h 47m total
  • Ontario to San Francisco
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WestJet
  • WestJet
  • 15/8
  • 1 total stop
  • 8h 56m total
  • Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Ontario to San Francisco.
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Price to beat on a one-way flight from Ontario to San Francisco.
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Find flight deals from Ontario to San Francisco

Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 June 2025.

Mon 11/86:00 a.m.YHM - SFO
1 stop8h 56mWestJet
Wed 13/812:50 p.m.SFO - YHM
1 stop8h 51mWestJet
Deal found 10/6C$ 323
Thu 24/77:15 p.m.YOW - SFO
2 stops21h 44mWestJet
Sun 3/86:05 p.m.SFO - YOW
1 stop9h 40mWestJet
Deal found 12/6C$ 358
Fri 26/93:35 p.m.YXU - SFO
1 stop8h 18mAir Canada
Tue 28/1010:45 p.m.SFO - YXU
1 stop7h 20mAir Canada
Deal found 11/6C$ 360
Sun 29/68:00 p.m.YXU - SFO
1 stop19h 05mWestJet
Sat 5/72:45 p.m.SFO - YXU
2 stops11h 29mWestJet
Deal found 11/6C$ 380
Wed 13/86:49 a.m.YYZ - SFO
1 stop10h 38mAmerican Airlines
Sat 16/812:45 a.m.SFO - YYZ
1 stop8h 45mAmerican Airlines
Deal found 12/6C$ 388
Mon 25/85:30 p.m.YUL - SFO
1 stop21h 26mWestJet
Tue 2/912:50 p.m.SFO - YUL
1 stop8h 51mWestJet
Deal found 10/6C$ 390
Sun 21/96:30 a.m.YYZ - SFO
1 stop10h 27mWestJet
Mon 6/107:30 a.m.SFO - YYZ
1 stop8h 22mWestJet
Deal found 10/6C$ 390
Thu 24/77:45 p.m.YKF - SFO
2 stops21h 14mWestJet
Sun 3/87:30 a.m.SFO - YKF
1 stop14h 16mWestJet
Deal found 10/6C$ 391
Sat 27/99:45 a.m.YYZ - SFO
Nonstop5h 38mMultiple Airlines
Sat 25/107:30 a.m.SFO - YYZ
1 stop8h 22mMultiple Airlines
Deal found 11/6C$ 398
Fri 20/66:45 a.m.YUL - SFO
1 stop8h 40mPorter Airlines
Wed 25/61:25 p.m.SFO - YUL
1 stop8h 12mPorter Airlines
Deal found 9/6C$ 406
Sat 22/113:25 p.m.YTZ - SFO
1 stop9h 12mAir Canada
Wed 3/128:40 a.m.SFO - YTZ
1 stop10h 10mAir Canada
Deal found 10/6C$ 410
Wed 9/78:25 p.m.YKF - SFO
1 stop16h 05mFlair Airlines
Wed 16/710:15 a.m.SFO - YKF
1 stop17h 55mFlair Airlines
Deal found 11/6C$ 416

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to San Francisco 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 June 2025.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.

Fly from

Ontario

Fly to

San Francisco

Route

Depart

Return

Price

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Mon 11/8

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

1 stop8h 56m

San Francisco

Wed 13/8

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

1 stop8h 51m

C$ 323

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Thu 24/7

7:15 p.m.-1:59 p.m.

2 stops21h 44m

San Francisco

Sun 3/8

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

1 stop9h 40m

C$ 358

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 26/9

3:35 p.m.-8:53 p.m.

1 stop8h 18m

San Francisco

Tue 28/10

10:45 p.m.-9:05 a.m.

1 stop7h 20m

C$ 360

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 29/6

8:00 p.m.-12:05 p.m.

1 stop19h 05m

San Francisco

Sat 5/7

2:45 p.m.-5:14 a.m.

2 stops11h 29m

C$ 380

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Wed 13/8

6:49 a.m.-2:27 p.m.

1 stop10h 38m

San Francisco

Sat 16/8

12:45 a.m.-12:30 p.m.

1 stop8h 45m

C$ 388

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Mon 25/8

5:30 p.m.-11:56 a.m.

1 stop21h 26m

San Francisco

Tue 2/9

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

1 stop8h 51m

C$ 390

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Thu 24/7

10:25 p.m.-1:59 p.m.

2 stops18h 34m

San Francisco

Sun 3/8

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

2 stops14h 03m

C$ 390

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Thu 24/7

7:45 p.m.-1:59 p.m.

2 stops21h 14m

San Francisco

Sun 3/8

7:30 a.m.-12:46 a.m.

1 stop14h 16m

C$ 391

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Tue 8/7

8:05 p.m.-10:10 a.m.

1 stop17h 05m

San Francisco

Tue 15/7

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

2 stops14h 03m

C$ 401

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Mon 18/8

6:45 a.m.-12:23 p.m.

1 stop8h 38m

San Francisco

Mon 25/8

1:25 p.m.-12:37 a.m.

1 stop8h 12m

C$ 409

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/6

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Ontario 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 Ontario to San Francisco

What is the cheapest month to book a flight from Region of Ontario to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of C$ 276). Flying from Region of Ontario to San Francisco in December is currently the most expensive (average of C$ 368). 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 ON to SFO?

Find hourly flight availability from Ontario to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 June 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to San Francisco as you normally would.

Weekly flight availability from Region of Ontario to San Francisco

Explore weekly flight availability from Ontario to San Francisco. 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 June 2025.

The most flights from CAON to SFO are scheduled on a Wednesday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (20 on average).

Rainfall in San Francisco by month

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

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 mm per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

Temperature in San Francisco by month

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

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 San Francisco. Reviews last updated 12 June 2025.
Read reviews from past customers who have flown Delta, Alaska Airlines and Porter Airlines from Ontario to San Francisco. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Alaska Airlines
8.0
Very good
10,000 reviews
Delta
8.0
Very good
7,946 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Porter Airlines
8.0
Very good
288 reviews
Delta
8.0
Very good
7,946 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air Transat
7.8
Good
396 reviews
Delta
8.0
Very good
7,946 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,946 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Francisco. 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 into for flights to San Francisco from Ontario?

    Located just 19.0 km from the city centre, San Francisco (SFO) is the airport most travelers will use when flying to San Francisco from Ontario.

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

    One-way options have recently been found by users for as low as C$ 193 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 202 and Air Canada from C$ 209 one-way.

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

    While some choose either Montreal Pierre Elliott Trudeau Intl - San Francisco or Hamilton - San Francisco, Toronto Pearson Intl - San Francisco is the most popular route from Region of Ontario to San Francisco.

  • What are the most reliable airlines from Region of Ontario to San Francisco?

    Before booking your flight to San Francisco from Region of Ontario, check out the most reliable airlines to get you to your destination on time: Porter Airlines (90%), Air Transat (90%), United Airlines( 79%).

  • What are the cheapest flights from Region of Ontario to San Francisco?

    Looking for the cheapest flight from Region of Ontario to San Francisco? While on average our users pay C$ 2,331, our data indicates the cheapest price to be C$ 245. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 338.

  • Can I find deals for flights from Ontario to San Francisco that include hotel bookings?

    Yes. In addition to deals on Ontario to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Francisco.

  • Can I find deals for business class flights from Ontario to San Francisco?

    Yes. Cheapflights offers flight deals from Ontario to San Francisco 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 Region of Ontario to San Francisco?

    Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of C$ 276). Flying from Region of Ontario to San Francisco in December is currently the most expensive (average of C$ 368). 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

Travelling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Richmond
San Ramon
Newark
Alameda
Redwood City
Burlingame
San Bruno
South San Francisco
Scotts Valley
Novato
Belmont
Millbrae
Santa Clara
Vallejo

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Alternative routes for Ontario to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Ontario to San Francisco

Discover the top 8 airlines that operate flights from Ontario to San Francisco. 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 June 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 255AverageC$ 548FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
WestJetCheapestC$ 283AverageC$ 409FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 295AverageC$ 465FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 326AverageC$ 592FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 330AverageC$ 625FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 341AverageC$ 560FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air TransatCheapestC$ 408AverageC$ 507FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Alaska AirlinesCheapestC$ 418AverageC$ 640FlexibilityNo cancel feeOn-time75%
Search Alaska 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 Ontario to San Francisco?

Cheapflights helps you search for flights from Ontario to San Francisco via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights helps you find that perfect flight to San Francisco from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to San Francisco, users can toggle the no change fees filter when performing a flight search.

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

Yes! Start tracking prices for Ontario to San Francisco flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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