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$276+ 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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap 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, 2025.

Round-trip from

$276
(Trip.com)

Popular in

December

Cheapest in

March

Average price

$491
From San Francisco to London
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($105 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
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Find 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, 2025.

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.
Mon 9/810:15 amSFO - YXU
2 stops15h 57mMultiple Airlines
Tue 9/166:00 amYXU - SFO
1 stop8h 54mMultiple Airlines
Deal found 7/27$276
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.
Mon 9/86:05 pmSFO - YXU
1 stop8h 07mWestJet
Tue 9/166:00 amYXU - SFO
1 stop8h 54mWestJet
Deal found 7/27$303
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Thu 9/1112:43 amSFO - YXU
2 stops17h 44mUnited Airlines
Fri 9/193:50 pmYXU - SFO
1 stop8h 03mUnited Airlines
Deal found 7/29$697

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, 2025.
Use the filters below to find and compare flights from San Francisco to London that are best for you.

Fly from

San Francisco

Fly to

London

Route

Depart

Return

Price

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 9/8

10:15 am-5:12 am

2 stops15h 57m

London

Tue 9/16

6:00 am-11:54 am

1 stop8h 54m

$276

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 9/8

6:05 pm-5:12 am

1 stop8h 07m

London

Tue 9/16

6:00 am-11:54 am

1 stop8h 54m

$303

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 9/11

12:43 am-9:27 pm

2 stops17h 44m

London

Fri 9/19

3:50 pm-8:53 pm

1 stop8h 03m

$697

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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 time of day to fly from SFO to YXU?

Find hourly flight availability from San Francisco to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

One of the essential ways to save on airfare from San Francisco to London, Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 39% on airfare.

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, 2025.
Read through reviews of airlines operating flights from San Francisco to London, such as United Airlines and WestJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,896 reviews

Food

6.6

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,896 reviews
United Airlines
7.4
Good
8,896 reviews

Food

6.6

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
WestJet
7.2
Good
2,972 reviews
United Airlines
7.4
Good
8,896 reviews

Food

6.6

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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.

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

    WestJet, at $303, was found to be the cheapest airline from San Francisco to London, Ontario. An alternate airline flying to your destination would be United Airlines. These flights start at 25% lower than the current average price 3 months from now.

  • 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?

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Top 3 airlines flying from San Francisco to London

Discover the top 3 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, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$162Average$491FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$178Average$412FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$186Average$424FlexibilityNo cancel feeOn-time69%

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