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Cheap flights from San Francisco to London, ON from C$ 186

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 18/11. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 11 September 2025.

Round-trip from

C$ 414

One-way from

C$ 186

Popular in

December

Cheapest in

March

Average price

C$ 626
24/10-31/10
  • 24/10-31/10
  • 4 total stops
  • 32h 27m total
  • San Francisco to London
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18/11
  • 18/11
  • 3 total stops
  • 29h 57m total
  • San Francisco to London
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Highest demand for flights based on searches. 18% potential increase in price (C$ 177 potential increase over avg. RT price).
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Cheapest flight prices on average. 10% potential price decrease (C$ 79 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 11 September 2025.

Fri 24/1010:15 a.m.SFO - YXU
2 stops15h 57mMultiple Airlines
Fri 31/108:00 p.m.YXU - SFO
2 stops16h 30mMultiple Airlines
Deal found 9/9C$ 414
Tue 7/107:30 a.m.SFO - YXU
1 stop8h 37mWestJet
Tue 14/108:00 p.m.YXU - SFO
1 stop18h 54mWestJet
Deal found 9/9C$ 644
Fri 24/1011:00 p.m.SFO - YXU
1 stop13h 02mAir Canada
Fri 31/105:45 a.m.YXU - SFO
1 stop8h 09mAir Canada
Deal found 9/9C$ 689
Thu 23/1012:43 a.m.SFO - YXU
2 stops11h 19mUnited Airlines
Fri 31/105:45 a.m.YXU - SFO
1 stop8h 09mUnited Airlines
Deal found 9/9C$ 714
Tue 7/1010:15 a.m.SFO - YXU
2 stops15h 57mMultiple Airlines
Tue 14/108:00 p.m.YXU - SFO
1 stop18h 54mMultiple Airlines
Deal found 9/9C$ 722
Mon 22/96:28 p.m.SFO - YXU
2 stops17h 49mUnited Airlines
Thu 25/96:10 a.m.YXU - SFO
2 stops12h 20mUnited Airlines
Deal found 8/9C$ 750
Sun 26/101:00 p.m.SFO - YXU
1 stop27h 12mMultiple Airlines
Sun 2/118:00 p.m.YXU - SFO
2 stops39h 53mMultiple Airlines
Deal found 11/9C$ 772
Sun 26/108:30 a.m.SFO - YXU
1 stop9h 51mAir Canada
Sun 2/115:45 a.m.YXU - SFO
1 stop8h 09mAir Canada
Deal found 11/9C$ 831
Mon 6/1012:43 a.m.SFO - YXU
2 stops11h 19mUnited Airlines
Tue 14/106:15 a.m.YXU - SFO
2 stops14h 31mUnited Airlines
Deal found 9/9C$ 859

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 September 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

Fri 24/10

10:15 a.m.-5:12 a.m.

2 stops15h 57m

London

Fri 31/10

8:00 p.m.-9:30 a.m.

2 stops16h 30m

C$ 414

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 19/2

7:30 a.m.-9:21 p.m.

2 stops10h 51m

London

Fri 20/2

5:45 a.m.-10:54 a.m.

1 stop8h 09m

C$ 586

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 7/10

7:30 a.m.-7:07 p.m.

1 stop8h 37m

London

Tue 14/10

8:00 p.m.-11:54 a.m.

1 stop18h 54m

C$ 644

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 18/2

12:32 a.m.-5:05 p.m.

2 stops13h 33m

London

Fri 20/2

5:45 a.m.-10:54 a.m.

1 stop8h 09m

C$ 696

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 23/10

12:43 a.m.-3:02 p.m.

2 stops11h 19m

London

Fri 31/10

5:45 a.m.-9:13 p.m.

2 stops18h 28m

C$ 736

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 22/9

6:28 p.m.-3:17 p.m.

2 stops17h 49m

London

Thu 25/9

6:10 a.m.-3:30 p.m.

2 stops12h 20m

C$ 750

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 18/11

10:15 a.m.-7:12 p.m.

3 stops29h 57m

C$ 186

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 25/10

10:15 a.m.-7:12 p.m.

2 stops29h 57m

C$ 226

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 20/11

8:53 p.m.-7:12 p.m.

2 stops19h 19m

C$ 237

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 20/11

1:00 p.m.-7:12 p.m.

1 stop27h 12m

C$ 272

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 16 results
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2

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, October is the cheapest month in which you can book a flight from San Francisco to London, Ontario (average of C$ 243). Flying from San Francisco to London, Ontario in December is currently the most expensive (average of C$ 478). 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 can get you from San Francisco to London, Ontario in just under 10h 51m. Your travel time can differ by up to . San Francisco and London, Ontario are separated by a distance of 3508 km.

  • 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, October is the cheapest month in which you can book a flight from San Francisco to London, Ontario (average of C$ 243). Flying from San Francisco to London, Ontario in December is currently the most expensive (average of C$ 478). 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
Grand Bend
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Can Cheapflights find flights from San Francisco to London with no change fees?

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