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Cheap flights from Ontario to San Francisco from C$ 215

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 24/6. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
26 Jan — 2 Feb1
1 adult

Cheap flight deals from Ontario to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (CAON) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 21 January 2025.

Round-trip from

C$ 374

One-way from

C$ 215
Porter Airlines
  • Porter Airlines
  • 14/2-16/2
  • 2 total stops
  • 16h 44m total
  • Ontario to San Francisco
Search Deals
WestJet
  • WestJet
  • 24/6
  • 1 total stop
  • 9h 05m total
  • Ontario to San Francisco
Search Deals

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 21 January 2025.

Fri 19/96:00 a.m.YHM - SFO
1 stop8h 54mWestJet
Mon 22/912:50 p.m.SFO - YHM
1 stop8h 50mWestJet
Deal found 19/1C$ 348
Fri 14/26:45 a.m.YUL - SFO
1 stop8h 54mPorter Airlines
Sun 16/21:40 p.m.SFO - YUL
1 stop7h 50mPorter Airlines
Deal found 20/1C$ 374
Thu 1/55:30 p.m.YUL - SFO
2 stops23h 29mWestJet
Thu 8/512:50 p.m.SFO - YUL
1 stop8h 53mWestJet
Deal found 19/1C$ 389
Mon 3/26:20 a.m.YOW - SFO
1 stop9h 19mPorter Airlines
Thu 6/21:40 p.m.SFO - YOW
1 stop8h 00mPorter Airlines
Deal found 20/1C$ 390
Tue 18/26:45 a.m.YUL - SFO
1 stop8h 54mMultiple Airlines
Mon 24/210:59 p.m.SFO - YUL
1 stop14h 36mMultiple Airlines
Deal found 20/1C$ 393
Wed 19/26:10 p.m.YOW - SFO
1 stop16h 06mMultiple Airlines
Tue 25/210:59 p.m.SFO - YOW
1 stop14h 46mMultiple Airlines
Deal found 20/1C$ 396
Thu 20/32:10 p.m.YOW - SFO
1 stop10h 32mUnited Airlines
Mon 24/37:05 p.m.SFO - YOW
2 stops16h 24mUnited Airlines
Deal found 19/1C$ 407
Sun 26/18:10 p.m.YYZ - SFO
1 stop14h 06mMultiple Airlines
Wed 5/28:06 a.m.SFO - YYZ
2 stops13h 34mMultiple Airlines
Deal found 19/1C$ 410
Tue 22/46:15 a.m.YOW - SFO
1 stop9h 51mWestJet
Mon 28/42:45 p.m.SFO - YOW
2 stops22h 35mWestJet
Deal found 20/1C$ 420
Tue 13/512:00 p.m.YYZ - SFO
2 stops12h 25mWestJet
Tue 27/52:45 p.m.SFO - YYZ
2 stops12h 27mWestJet
Deal found 20/1C$ 420
Thu 24/46:30 a.m.YKF - SFO
1 stop9h 36mWestJet
Wed 30/412:50 p.m.SFO - YKF
1 stop8h 56mWestJet
Deal found 20/1C$ 422
Wed 23/49:45 a.m.YYZ - SFO
Nonstop5h 54mPorter Airlines
Tue 29/41:40 p.m.SFO - YYZ
Nonstop5h 02mPorter Airlines
Deal found 19/1C$ 469

Find flights from Ontario to San Francisco within your budget

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 21 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Fri 7/2

6:10 p.m.-12:39 p.m.

2 stops21h 29m

San Francisco

Wed 19/2

1:40 p.m.-12:35 a.m.

1 stop7h 55m

C$ 374

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Thu 1/5

5:30 p.m.-1:59 p.m.

2 stops23h 29m

San Francisco

Thu 8/5

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

1 stop8h 53m

C$ 389

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 4/6

7:00 a.m.-12:23 p.m.

1 stop8h 23m

San Francisco

Sun 15/6

1:25 p.m.-12:21 a.m.

1 stop7h 56m

C$ 389

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Tue 18/2

6:45 a.m.-12:39 p.m.

1 stop8h 54m

San Francisco

Mon 24/2

10:59 p.m.-4:35 p.m.

1 stop14h 36m

C$ 393

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Fri 2/5

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

2 stops10h 59m

San Francisco

Mon 12/5

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

1 stop8h 51m

C$ 396

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Wed 19/2

6:10 p.m.-7:16 a.m.

1 stop16h 06m

San Francisco

Tue 25/2

10:59 p.m.-4:45 p.m.

1 stop14h 46m

C$ 396

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Thu 20/3

2:10 p.m.-9:42 p.m.

1 stop10h 32m

San Francisco

Mon 24/3

7:05 p.m.-2:29 p.m.

2 stops16h 24m

C$ 407

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Fri 9/5

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

2 stops10h 59m

San Francisco

Mon 12/5

2:45 p.m.-12:46 a.m.

2 stops31h 01m

C$ 410

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Tue 18/2

8:00 p.m.-9:42 a.m.

1 stop16h 42m

San Francisco

Tue 25/2

1:40 p.m.-9:42 p.m.

Nonstop5h 02m

C$ 410

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Tue 22/4

6:15 a.m.-1:06 p.m.

1 stop9h 51m

San Francisco

Mon 28/4

2:45 p.m.-4:20 p.m.

2 stops22h 35m

C$ 420

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/1

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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.

Travel insights for flights from Ontario to San Francisco

Get recent, data-driven insights about flights from Ontario to San Francisco including ideal travel times, pricing trends, and more.

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 June is currently the most expensive (average of C$ 379). 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 21 January 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 21 January 2025.

The most flights from CAON to SFO are scheduled on a Monday (18 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (12 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 21 January 2025.
Read reviews from past customers who have flown Porter Airlines, WestJet and United 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
8,521 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Crew

8.6

Reviews

1 / 10

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

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Crew

8.6

Reviews

1 / 10

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

Alaska Airlines
8.0
Very good
9,696 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Crew

8.6

Reviews

1 / 10

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

Porter Airlines
7.9
Good
277 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Crew

8.6

Reviews

1 / 10

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

KLM
7.8
Good
1,341 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Crew

8.6

Reviews

1 / 10

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

Air Transat
7.8
Good
381 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Crew

8.6

Reviews

1 / 10

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$ 215 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 225 and United Airlines from C$ 259 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 Toronto Island - 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: Austrian Airlines (63%), United Airlines (63%), Singapore Airlines( 62%).

  • 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$ 1,838, our data indicates the cheapest price to be C$ 273. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 291.

  • 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 June is currently the most expensive (average of C$ 379). 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
Novato
Burlingame
Redwood City
South San Francisco
Scotts Valley
San Bruno
Belmont
Millbrae
Santa Clara

Browse thousands of different options on Cheapflights for your next trip

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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 10 airlines flying from Ontario to San Francisco

Discover the top 10 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 21 January 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 245AverageC$ 692FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Lynx AirCheapestC$ 287AverageC$ 347FlexibilityNo cancel feeOn-timeN/A
Search Lynx Air flights
American AirlinesCheapestC$ 311AverageC$ 552FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapestC$ 351AverageC$ 569FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 366AverageC$ 622FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 370AverageC$ 687FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 385AverageC$ 708FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air TransatCheapestC$ 501AverageC$ 535FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Alaska AirlinesCheapestC$ 578AverageC$ 699FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJet EncoreCheapestC$ 674AverageC$ 740FlexibilityNo cancel feeOn-timeN/A
Search WestJet Encore 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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