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$238+ 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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
Apr 13 — Apr 201
Mon 4/13
Mon 4/20
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 March 14, 2026.

This Trip.com deal was found by Cheapflights users on 3/13. 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.
Mon 4/276:00 am
SFO
-
YXU
1 stop20h 20m
WestJet
Mon 5/46:10 am
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 3/13$371
This FlightHub deal was found by Cheapflights users on 3/10. 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.
Wed 6/176:05 pm
SFO
-
YXU
1 stop8h 15m
WestJet
Mon 6/226:10 am
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 3/10$397
This Air Canada deal was found by Cheapflights users on 3/12. 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.
Fri 5/17:30 pm
SFO
-
YXU
2 stops13h 13m
Air Canada
Tue 5/55:40 am
YXU
-
SFO
1 stop8h 10m
Air Canada
Deal found 3/12$415
This Trip.com deal was found by Cheapflights users on 3/11. 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.
Sat 5/166:00 am
SFO
-
YXU
1 stop20h 20m
WestJet
Sat 6/206:10 am
YXU
-
SFO
1 stop13h 30m
WestJet
Deal found 3/11$425
This WestJet deal was found by Cheapflights users on 3/9. 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.
Fri 5/16:00 am
SFO
-
YXU
1 stop20h 20m
WestJet
Tue 5/56:10 am
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 3/9$445

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 March 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$371
(Trip.com)

One-way from

$180
(WestJet)
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 March 14, 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
Quickest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 5/1

7:30 pm-11:43 am

2 stops13h 13m

London

Tue 5/5

5:40 am-10:50 am

1 stop8h 10m

$415

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 5/16

6:00 am-5:20 am

1 stop20h 20m

London

Sat 6/20

6:10 am-4:40 pm

1 stop13h 30m

$425

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 5/1

6:00 am-5:20 am

1 stop20h 20m

London

Tue 5/5

6:10 am-12:00 pm

1 stop8h 50m

$445

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 6/17

11:59 pm-2:57 pm

2 stops11h 58m

London

Mon 6/22

3:30 pm-6:58 am

2 stops18h 28m

$553
Cheapest one-way

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 4/23

11:55 am-8:44 am

1 stop17h 49m

$259

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 4/20

6:45 pm-6:35 am

3 stops32h 50m

$271

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 4/25

7:59 pm-5:20 am

3 stops30h 21m

$288

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 4/23

6:55 pm-5:04 pm

2 stops19h 09m

$384
Quickest one-way

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 4/20

8:30 am-9:19 pm

1 stop9h 49m

$413

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Sorted by cheapest first
  • 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.

Cheapflights Insights

Everything you need to know about your flight from San Francisco to London

What is the cheapest month to book a flight from San Francisco to London, Ontario?

Currently, February is the cheapest month in which you can book a flight from San Francisco to London, Ontario (average of $126). Flying from San Francisco to London, Ontario in January is currently the most expensive (average of $221). 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.

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 March 14, 2026.
Read through reviews of airlines operating flights from San Francisco to London, such as Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,800 reviews

Overall

7.1

Crew

7.8

Comfort

7.1

Food

6.3

Boarding

7.3

Entertainment

6.8

Reviews

1 / 20
8.0
Excellent

Dr vandana,Feb 2026

SFO - YYC

It was good, the lounge facilities can be better with some vegetarian options. Overall good
Air Canada
7.1
Good
10,800 reviews
Air Canada
7.1
Good
10,800 reviews

Overall

7.1

Crew

7.8

Comfort

7.1

Food

6.3

Boarding

7.3

Entertainment

6.8

Reviews

1 / 20
8.0
Excellent

Dr vandana,Feb 2026

SFO - YYC

It was good, the lounge facilities can be better with some vegetarian options. Overall good

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 13h 13m. Air Canada provides one of the quickest options available for as low as $415. The distance from San Francisco to London, Ontario is about 2180 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from San Francisco to London, Ontario round-trip?

    Air Canada, at $210, was found to be the cheapest airline from San Francisco to London, Ontario..

  • 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.

  • What is the cheapest month to book a flight from San Francisco to London, Ontario?

    Currently, February is the cheapest month in which you can book a flight from San Francisco to London, Ontario (average of $126). Flying from San Francisco to London, Ontario in January is currently the most expensive (average of $221). 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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Top airline flying from San Francisco to London

Discover the top airline 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 March 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$210Average$439FlexibilityNo cancel feeOn-time67%

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