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$125+ 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$381
(Kiwi.com)

One-way from

$125
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$443
From San Francisco to London
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One-way flight from San Francisco to London
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Highest demand for flights based on searches. 20% potential increase in price ($102 potential increase over avg. RT price).
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Cheapest flight prices on average. 11% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/301:00 pmSFO - YXU
1 stop27h 12mMultiple Airlines
Thu 11/68:10 pmYXU - SFO
2 stops40h 20mMultiple Airlines
Deal found 9/15$381
This Air Canada deal was found by Cheapflights users on 9/15. 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.
Thu 10/3012:00 pmSFO - YXU
1 stop17h 46mAir Canada
Thu 11/65:45 amYXU - SFO
1 stop8h 09mAir Canada
Deal found 9/15$417
This United Airlines deal was found by Cheapflights users on 9/15. 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 10/308:55 pmSFO - YXU
2 stops17h 11mUnited Airlines
Thu 11/65:40 pmYXU - SFO
2 stops10h 35mUnited Airlines
Deal found 9/15$494
This Air Canada deal was found by Cheapflights users on 9/17. 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.
Sat 11/17:30 amSFO - YXU
2 stops10h 51mAir Canada
Sat 11/85:15 amYXU - SFO
1 stop8h 39mAir Canada
Deal found 9/17$509
This Air Canada deal was found by Cheapflights users on 9/17. 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.
Thu 10/308:30 amSFO - YXU
1 stop9h 51mAir Canada
Fri 10/319:25 amYXU - SFO
1 stop15h 09mAir Canada
Deal found 9/17$551
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Fri 10/3112:43 amSFO - YXU
2 stops13h 22mUnited Airlines
Sat 11/85:15 amYXU - SFO
1 stop8h 39mUnited Airlines
Deal found 9/17$589
This United deal was found by Cheapflights users on 9/17. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2912:43 amSFO - YXU
2 stops13h 23mMultiple Airlines
Fri 10/319:25 amYXU - SFO
2 stops14h 57mMultiple Airlines
Deal found 9/17$594
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Wed 10/2912:43 amSFO - YXU
2 stops13h 23mUnited Airlines
Fri 10/319:25 amYXU - SFO
1 stop14h 25mUnited Airlines
Deal found 9/17$612

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 September 17, 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

Thu 2/19

7:30 am-9:21 pm

2 stops10h 51m

London

Fri 2/20

5:45 am-10:54 am

1 stop8h 09m

$400

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 10/30

12:00 pm-8:46 am

1 stop17h 46m

London

Thu 11/6

5:45 am-10:54 am

1 stop8h 09m

$417

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 10/30

8:55 pm-5:06 pm

2 stops17h 11m

London

Thu 11/6

5:40 pm-1:15 am

2 stops10h 35m

$494

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 2/18

12:43 am-9:21 pm

2 stops17h 38m

London

Fri 2/20

5:45 am-10:54 am

1 stop8h 09m

$509

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 11/18

10:15 am-7:12 pm

3 stops29h 57m

$125

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 11/20

1:00 pm-7:12 pm

1 stop27h 12m

$135

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 11/18

1:00 pm-7:12 pm

1 stop27h 12m

$135

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 11/16

10:15 am-7:12 pm

2 stops29h 57m

$151

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 10/21

10:15 am-5:12 am

2 stops15h 57m

$155

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 10/1

10:15 am-5:12 am

2 stops15h 57m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 September 17, 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 September 17, 2025.
Read through reviews of airlines operating flights from San Francisco to London, such as United Airlines, WestJet, and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

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
8,926 reviews
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

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
3,095 reviews
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

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??
Air Canada
7.1
Good
10,000 reviews
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

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.

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

    A quick flight from San Francisco to London, Ontario can take about 10h 51m. Air Canada provides one of the quickest options available for as low as $400. 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 $162, was found to be the cheapest airline from San Francisco to London, Ontario.Alternate airlines to your destination round-trip include Air Canada and United Airlines. These flights start at 60% 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?

Book flights to London if you plan to visit one of these locations
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Alternative routes for San Francisco to London

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$162Average$478FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$178Average$412FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$186Average$405FlexibilityNo cancel feeOn-time69%

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