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$217+ Cheap flights from San Francisco (SFO) to London, ON (YXU)

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 11/25. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
1 adult, Economy
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Cheap flight deals from San Francisco to London

Cheapest flights from San Francisco to London
Explore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.

This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am
SFO
-
YXU
1 stop7h 45m
WestJet
Wed 10/76:10 am
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 7/27$336
This Trip.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/101:00 pm
SFO
-
YXU
1 stop13h 20m
WestJet
Thu 9/176:10 am
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 7/27$351
This Justfly.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:05 pm
SFO
-
YXU
1 stop8h 15m
WestJet
Tue 8/182:40 pm
YXU
-
SFO
2 stops24h 20m
WestJet
Deal found 7/24$355
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:07 pm
SFO
-
YXU
2 stops14h 13m
Multiple Airlines
Thu 9/176:10 am
YXU
-
SFO
1 stop8h 50m
Multiple Airlines
Deal found 7/27$380
This Air Canada deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/234:30 pm
SFO
-
YXU
2 stops13h 50m
Air Canada
Sat 9/265:40 am
YXU
-
SFO
1 stop9h 54m
Air Canada
Deal found 7/25$411
This WestJet deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:05 pm
SFO
-
YXU
1 stop8h 15m
WestJet
Sat 9/266:10 am
YXU
-
SFO
1 stop18h 45m
WestJet
Deal found 7/25$420
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2711:00 am
SFO
-
YXU
2 stops15h 20m
Multiple Airlines
Wed 9/96:10 am
YXU
-
SFO
1 stop8h 50m
Multiple Airlines
Deal found 7/26$421
This Trip.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/251:00 pm
SFO
-
YXU
1 stop13h 20m
WestJet
Tue 9/12:40 pm
YXU
-
SFO
2 stops10h 15m
WestJet
Deal found 7/28$461

Find flight deals from San Francisco to London

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to London (YXU). 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 July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$336
(FlightHub)

One-way from

$217
(Air Canada)
Provider with most accurate pricing for San Francisco-London flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-London flights.
Search Deals
From San Francisco to London
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One-way flight from San Francisco to London
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Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to London 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 2,558,603 searches. Data last updated July 29, 2026.
Use the filters below to find and compare flights from San Francisco to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 8/17

6:05 pm-5:20 am

1 stop8h 15m

London

Tue 8/18

5:55 pm-9:55 pm

1 stop31h 00m

$360

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 9/23

1:35 pm-9:20 am

1 stop16h 45m

London

Sat 9/26

5:40 am-12:34 pm

1 stop9h 54m

$430
Quickest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/11

6:00 am-4:45 pm

1 stop7h 45m

London

Wed 8/12

6:10 am-4:06 pm

2 stops12h 56m

$490

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/11

10:51 pm-9:20 am

1 stop7h 29m

London

Wed 8/12

3:30 pm-10:42 am

2 stops22h 12m

$492

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 8/17

5:00 am-9:40 pm

2 stops13h 40m

London

Tue 8/18

10:05 am-8:51 pm

2 stops13h 46m

$495

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 8/27

9:30 pm-2:50 pm

2 stops14h 20m

London

Mon 8/31

10:05 am-8:30 pm

2 stops13h 25m

$502
Cheapest one-way
Quickest one-way

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 11/25

9:00 am-9:52 pm

2 stops9h 52m

$217

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 10/10

1:00 pm-4:45 pm

1 stop24h 45m

$247

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 10/9

6:00 am-5:20 am

1 stop20h 20m

$254

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 10/11

1:00 pm-5:20 am

1 stop13h 20m

$256

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/25

Showing 1-10 of 14 resultsSorted by cheapest first
1
2
  • Most accurate provider: When it comes to deals on San Francisco-London, Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Francisco-London, Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Francisco-London, Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Francisco-London, Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Francisco-London, Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Francisco to London

Have a flexible travel schedule? Discover the best time to fly to London 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.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated July 29, 2026.
Read through reviews of airlines operating flights from San Francisco to London, such as WestJet and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
WestJet
7.2
Good
3,415 reviews

Overall

7.2

Food

6.2

Crew

7.9

Entertainment

6.1

Comfort

7.0

Boarding

7.4

Reviews

1 / 20
10.0
Excellent

Brian,Aug 2023

SFO - YYC

Great experience on WestJet from SFO to YYC. (My experience at YYC wasn't as good, but that's for another review) The gate area is spacious, with lots of seating and electrical power. Boarding was pretty seamless, aircraft was in excellent shape, great crew, good food (in Business), and smooth flight. I wouldn't hesitate to take WestJet in/out of SFO again.
WestJet
7.2
Good
3,415 reviews
WestJet
7.2
Good
3,415 reviews

Overall

7.2

Food

6.2

Crew

7.9

Entertainment

6.1

Comfort

7.0

Boarding

7.4

Reviews

1 / 20
10.0
Excellent

Brian,Aug 2023

SFO - YYC

Great experience on WestJet from SFO to YYC. (My experience at YYC wasn't as good, but that's for another review) The gate area is spacious, with lots of seating and electrical power. Boarding was pretty seamless, aircraft was in excellent shape, great crew, good food (in Business), and smooth flight. I wouldn't hesitate to take WestJet in/out of SFO again.
Air Canada
7.1
Good
11,399 reviews
WestJet
7.2
Good
3,415 reviews

Overall

7.2

Food

6.2

Crew

7.9

Entertainment

6.1

Comfort

7.0

Boarding

7.4

Reviews

1 / 20
10.0
Excellent

Brian,Aug 2023

SFO - YYC

Great experience on WestJet from SFO to YYC. (My experience at YYC wasn't as good, but that's for another review) The gate area is spacious, with lots of seating and electrical power. Boarding was pretty seamless, aircraft was in excellent shape, great crew, good food (in Business), and smooth flight. I wouldn't hesitate to take WestJet in/out of SFO again.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from San Francisco to London, Ontario?

    A quick flight from San Francisco to London, Ontario can take about 7h 45m. WestJet provides one of the quickest options available for as low as $336. The distance from San Francisco to London, Ontario is about 2180 mi.

  • What are the cheapest airlines flying from San Francisco to London, Ontario round-trip?

    WestJet, at $355, was found to be the cheapest airline from San Francisco to London, Ontario. An alternate airline flying to your destination would be Air Canada.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Francisco to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from San Francisco to London

Discover the top 2 airlines that operate flights from San Francisco to London. 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 2,558,603 searches. Data last updated July 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$355Average$660FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$358Average$674FlexibilityNo cancel feeOn-time67%

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