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Cheap flights from San Francisco to London, ON from C$ 244

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
10 Apr — 17 Apr1
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 11 March 2026.

Fri 1/56:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Tue 5/56:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 5/3C$ 511
Wed 17/66:05 p.m.
SFO
-
YXU
1 stop8h 15m
WestJet
Mon 22/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 6/3C$ 530
Fri 15/51:00 p.m.
SFO
-
YXU
1 stop13h 20m
WestJet
Sat 30/56:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 6/3C$ 539
Fri 1/57:30 p.m.
SFO
-
YXU
2 stops13h 13m
Air Canada
Tue 5/55:40 a.m.
YXU
-
SFO
1 stop10h 00m
Air Canada
Deal found 5/3C$ 540
Thu 4/66:05 p.m.
SFO
-
YXU
1 stop8h 15m
WestJet
Thu 11/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 5/3C$ 543
Thu 4/66:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Fri 12/62:40 p.m.
YXU
-
SFO
2 stops10h 15m
WestJet
Deal found 5/3C$ 551
Fri 5/67:30 p.m.
SFO
-
YXU
2 stops13h 13m
Air Canada
Tue 9/63:30 p.m.
YXU
-
SFO
1 stop8h 40m
Air Canada
Deal found 5/3C$ 573
Sat 6/67:30 p.m.
SFO
-
YXU
2 stops13h 13m
Air Canada
Tue 9/69:30 a.m.
YXU
-
SFO
2 stops12h 02m
Air Canada
Deal found 5/3C$ 581

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 11 March 2026.

Round-trip from

C$ 530

One-way from

C$ 244
WestJet
  • WestJet
  • 17/6-22/6
  • 2 total stops
  • 17h 05m total
  • San Francisco to London
Search Deals
WestJet
  • WestJet
  • 12/5
  • 1 total stop
  • 7h 45m total
  • 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 629,999 searches. Data last updated 11 March 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 1/5

6:00 a.m.-4:45 p.m.

1 stop7h 45m

London

Tue 5/5

6:10 a.m.-12:00 p.m.

1 stop8h 50m

C$ 549

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 1/5

7:30 p.m.-11:43 a.m.

2 stops13h 13m

London

Tue 5/5

5:40 a.m.-10:50 a.m.

1 stop8h 10m

C$ 592

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 5/6

6:05 p.m.-5:20 a.m.

1 stop8h 15m

London

Mon 8/6

6:10 a.m.-12:00 p.m.

1 stop8h 50m

C$ 633

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 10/7

6:05 p.m.-5:20 a.m.

1 stop8h 15m

London

Tue 14/7

6:10 a.m.-12:00 p.m.

1 stop8h 50m

C$ 653

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 5/6

6:05 p.m.-5:20 a.m.

1 stop8h 15m

London

Wed 10/6

6:10 a.m.-12:00 p.m.

1 stop8h 50m

C$ 667

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 5/6

6:05 p.m.-5:20 a.m.

1 stop8h 15m

London

Tue 9/6

6:10 a.m.-12:00 p.m.

1 stop8h 50m

C$ 667

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 6/6

6:05 p.m.-5:20 a.m.

1 stop8h 15m

London

Tue 9/6

6:10 a.m.-12:00 p.m.

1 stop8h 50m

C$ 667
Cheapest one-way
Quickest one-way

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 27/5

6:00 a.m.-4:45 p.m.

1 stop7h 45m

C$ 244

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 12/5

6:00 a.m.-4:45 p.m.

1 stop7h 45m

C$ 244

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 12/5

7:30 p.m.-11:43 a.m.

2 stops13h 13m

C$ 270

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/3

Showing 1-10 of 13 resultsSorted by cheapest first
1
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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$ 171). Flying from San Francisco to London, Ontario in January is currently the most expensive (average of C$ 300). 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?

    WestJet and Air Canada can get you from San Francisco to London, Ontario in just under 7h 45m. Your travel time can differ by up to 5h 28m. 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$ 171). Flying from San Francisco to London, Ontario in January is currently the most expensive (average of C$ 300). 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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By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to London from San Francisco.

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?

Of course! You can now track prices for flights from San Francisco to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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