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Cheap flights from San Francisco to London, ON from C$ 298

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 23/4. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
26 Feb — 5 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from San Francisco to London

Enter your travel dates to find the best prices.

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 27 January 2026.

Sat 11/48:30 a.m.
SFO
-
YXU
1 stop9h 48m
Air Canada
Wed 15/49:25 a.m.
YXU
-
SFO
1 stop8h 55m
Air Canada
Deal found 25/1C$ 637
Fri 13/38:53 a.m.
SFO
-
YXU
1 stop9h 28m
United Airlines
Fri 20/39:25 a.m.
YXU
-
SFO
1 stop9h 00m
United Airlines
Deal found 27/1C$ 754
Thu 12/38:52 p.m.
SFO
-
YXU
2 stops17h 13m
United Airlines
Thu 19/39:25 a.m.
YXU
-
SFO
1 stop9h 00m
United Airlines
Deal found 26/1C$ 767
Wed 18/38:53 a.m.
SFO
-
YXU
1 stop9h 28m
Air Canada
Sun 22/35:40 p.m.
YXU
-
SFO
1 stop19h 00m
Air Canada
Deal found 27/1C$ 798

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 27 January 2026.

Round-trip from

C$ 637

One-way from

C$ 298

Popular in

December

Cheapest in

March

Average price

C$ 589
Air Canada
  • Air Canada
  • 11/4-15/4
  • 2 total stops
  • 18h 43m total
  • San Francisco to London
Search Deals
Air Canada
  • Air Canada
  • 23/4
  • 1 total stop
  • 9h 48m total
  • San Francisco to London
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (C$ 238 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (C$ 45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 629,999 searches. Data last updated 27 January 2026.
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

Sat 11/4

8:30 a.m.-9:18 p.m.

1 stop9h 48m

London

Wed 15/4

5:10 a.m.-3:32 p.m.

2 stops13h 22m

C$ 644

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 13/3

8:53 a.m.-9:21 p.m.

1 stop9h 28m

London

Fri 20/3

9:25 a.m.-3:25 p.m.

1 stop9h 00m

C$ 754

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 12/3

8:52 p.m.-5:05 p.m.

2 stops17h 13m

London

Thu 19/3

9:25 a.m.-3:25 p.m.

1 stop9h 00m

C$ 767

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 18/3

5:05 a.m.-5:05 p.m.

2 stops9h 00m

London

Sun 22/3

5:40 p.m.-9:40 a.m.

1 stop19h 00m

C$ 798

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 18/3

6:45 a.m.-9:21 p.m.

2 stops11h 36m

London

Sun 22/3

9:25 a.m.-1:28 a.m.

2 stops19h 03m

C$ 811

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 23/4

8:30 a.m.-9:18 p.m.

1 stop9h 48m

C$ 298

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

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 C$ 174). Flying from San Francisco to London, Ontario in August is currently the most expensive (average of C$ 278). 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.

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?

    Air Canada and United Airlines can get you from San Francisco to London, Ontario in just under 9h 28m. Your travel time can differ by up to 20m. San Francisco and London, Ontario are separated by a distance of 3508 km. This flight may include one or multiple stops.

  • 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 C$ 174). Flying from San Francisco to London, Ontario in August is currently the most expensive (average of C$ 278). 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

Travelling to a place near London?

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

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How does Cheapflights help users find flights from San Francisco to London?

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Can Cheapflights find flights from San Francisco to London with no change fees?

Need flexible booking options for your flight to London from San Francisco? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from San Francisco to London become cheaper?

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