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$317+ Cheap flights from San Francisco (SFO) to London, ON (YXU)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
May 25 — Jun 11
Mon 5/25
Mon 6/1
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 April 25, 2026.

This FlightHub deal was found by Cheapflights users on 4/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/216:05 pm
SFO
-
YXU
1 stop8h 15m
WestJet
Thu 7/236:10 am
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 4/25$317
This oojo deal was found by Cheapflights users on 4/23. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/106:05 pm
SFO
-
YXU
1 stop8h 15m
WestJet
Tue 7/142:40 pm
YXU
-
SFO
2 stops10h 15m
WestJet
Deal found 4/23$322
This FlightHub deal was found by Cheapflights users on 4/22. 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.
Tue 5/126:00 am
SFO
-
YXU
1 stop7h 45m
WestJet
Sun 5/176:10 am
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 4/22$346
This Air Canada deal was found by Cheapflights users on 4/21. 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.
Mon 8/317:30 pm
SFO
-
YXU
2 stops13h 15m
Air Canada
Wed 9/25:40 am
YXU
-
SFO
1 stop9h 52m
Air Canada
Deal found 4/21$378
This Kiwi.com deal was found by Cheapflights users on 4/23. 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.
Fri 7/106:05 pm
SFO
-
YXU
1 stop8h 15m
Multiple Airlines
Mon 7/135:55 pm
YXU
-
SFO
2 stops29h 45m
Multiple Airlines
Deal found 4/23$457
This Trip.com deal was found by Cheapflights users on 4/23. 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.
Fri 7/106:05 pm
SFO
-
YXU
1 stop8h 15m
WestJet
Sun 7/122:40 pm
YXU
-
SFO
2 stops10h 15m
WestJet
Deal found 4/23$479
This United Airlines deal was found by Cheapflights users on 4/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2110:47 pm
SFO
-
YXU
1 stop7h 33m
United Airlines
Thu 7/235:10 am
YXU
-
SFO
2 stops12h 59m
United Airlines
Deal found 4/25$507

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 April 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$317
(FlightHub)
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
Search Deals

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 April 25, 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

Tue 7/21

6:05 pm-5:20 am

1 stop8h 15m

London

Thu 7/23

6:10 am-12:00 pm

1 stop8h 50m

$317

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 8/31

7:30 pm-11:45 am

2 stops13h 15m

London

Wed 9/2

5:40 am-12:32 pm

1 stop9h 52m

$378

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 7/21

10:47 pm-9:20 am

1 stop7h 33m

London

Thu 7/23

5:10 am-3:09 pm

2 stops12h 59m

$507

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 7/21

10:47 pm-9:20 am

1 stop7h 33m

London

Thu 7/23

5:10 am-3:09 pm

2 stops12h 59m

$507

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 7/10

11:47 pm-2:55 pm

2 stops12h 08m

London

Tue 7/14

5:10 am-2:09 pm

2 stops11h 59m

$515
Cheapest one-way

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 5/21

10:57 am-5:20 am

3 stops39h 23m

$349
Quickest one-way

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 5/21

6:00 am-4:45 pm

1 stop7h 45m

$418

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/22

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.

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 April 25, 2026.
Read through reviews of airlines operating flights from San Francisco to London, such as WestJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
WestJet
7.2
Good
3,325 reviews

Entertainment

6.1

Overall

7.2

Comfort

7.0

Food

6.2

Boarding

7.4

Crew

7.9

Reviews

1 / 20
10.0
Excellent

Janice,Mar 2026

TQO - YYZ

I had a very happy experience with fast boarding, an early flight and landing, and a quick baggage claim.
WestJet
7.2
Good
3,325 reviews
WestJet
7.2
Good
3,325 reviews

Entertainment

6.1

Overall

7.2

Comfort

7.0

Food

6.2

Boarding

7.4

Crew

7.9

Reviews

1 / 20
10.0
Excellent

Janice,Mar 2026

TQO - YYZ

I had a very happy experience with fast boarding, an early flight and landing, and a quick baggage claim.

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 8h 15m. WestJet provides one of the quickest options available for as low as $317. 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?

    WestJet, at $162, 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.

See more FAQs

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Grand Bend

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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 April 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$162Average$405FlexibilityNo cancel feeOn-time60%

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