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Cheap flights from San Francisco to London from $125

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to London departing on 11/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from San Francisco to London

Cheap round-trip flights

Multiple Airlines Logo
1:00 pm - 7:12 pmSFO-YXU
27h 12m1 stop
Multiple Airlines Logo
8:10 pm - 9:30 amYXU-SFO
40h 20m2 stops
$381Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Air Canada Logo
7:30 am - 9:21 pmSFO-YXU
10h 51m2 stops
Air Canada Logo
5:45 am - 10:54 amYXU-SFO
8h 09m1 stop
$400Air Canada
Find Deal
Thu, Feb 19 - Fri, Feb 20
Air Canada Logo
7:30 am - 9:21 pmSFO-YXU
10h 51m2 stops
Air Canada Logo
9:25 am - 9:22 pmYXU-SFO
14h 57m2 stops
$405Air Canada
Find Deal
Thu, Feb 19 - Fri, Feb 20
Air Canada Logo
7:30 am - 9:21 pmSFO-YXU
10h 51m2 stops
Air Canada Logo
9:25 am - 9:22 pmYXU-SFO
14h 57m2 stops
$411Air Canada
Find Deal
Thu, Feb 19 - Fri, Feb 20
Air Canada Logo
12:00 pm - 8:46 amSFO-YXU
17h 46m1 stop
Air Canada Logo
5:45 am - 10:54 amYXU-SFO
8h 09m1 stop
$417Air Canada
Find Deal
Thu, Oct 30 - Thu, Nov 6
Air Canada Logo
8:30 am - 9:21 pmSFO-YXU
9h 51m1 stop
Air Canada Logo
5:45 am - 10:54 amYXU-SFO
8h 09m1 stop
$419Air Canada
Find Deal
Thu, Feb 19 - Fri, Feb 20
United Airlines Logo
8:55 pm - 5:06 pmSFO-YXU
17h 11m2 stops
United Airlines Logo
5:40 pm - 1:15 amYXU-SFO
10h 35m2 stops
$494United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
12:43 am - 9:21 pmSFO-YXU
17h 38m2 stops
United Airlines Logo
5:45 am - 10:54 amYXU-SFO
8h 09m1 stop
$509United Airlines
Find Deal
Wed, Feb 18 - Fri, Feb 20
United Airlines Logo
12:43 am - 9:21 pmSFO-YXU
17h 38m2 stops
United Airlines Logo
5:40 pm - 1:28 amYXU-SFO
10h 48m2 stops
$524United Airlines
Find Deal
Wed, Feb 18 - Fri, Feb 20
Multiple Airlines Logo
10:15 am - 7:12 pmSFO-YXU
29h 57m3 stops
Multiple Airlines Logo
8:10 pm - 12:40 pmYXU-SFO
19h 30m2 stops
$756Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6

United Airlines flights from San Francisco to London, Ontario

Our best United Airlines deals on San Francisco to London, Ontario flight tickets
United Airlines
Oct 30
SFO8:55 pmSan Francisco
17h 11m
2 stops
YXU5:06 pmLondon
Nov 6
YXU5:40 pmLondon
10h 35m
2 stops
SFO1:15 amSan Francisco
$494
Find similar
United Airlines
Feb 18
SFO12:43 amSan Francisco
17h 38m
2 stops
YXU9:21 pmLondon
Feb 20
YXU5:45 amLondon
8h 09m
1 stop
SFO10:54 amSan Francisco
$509
Find similar
United Airlines
Feb 18
SFO12:43 amSan Francisco
17h 38m
2 stops
YXU9:21 pmLondon
Feb 20
YXU5:40 pmLondon
10h 48m
2 stops
SFO1:28 amSan Francisco
$524
Find similar

Air Canada flights from San Francisco to London, Ontario

Our best Air Canada deals on San Francisco to London, Ontario flight tickets
Air Canada
Feb 19
SFO7:30 amSan Francisco
10h 51m
2 stops
YXU9:21 pmLondon
Feb 20
YXU5:45 amLondon
8h 09m
1 stop
SFO10:54 amSan Francisco
$400
Find similar
Air Canada
Feb 19
SFO7:30 amSan Francisco
10h 51m
2 stops
YXU9:21 pmLondon
Feb 20
YXU9:25 amLondon
14h 57m
2 stops
SFO9:22 pmSan Francisco
$405
Find similar
Air Canada
Feb 19
SFO7:30 amSan Francisco
10h 51m
2 stops
YXU9:21 pmLondon
Feb 20
YXU9:25 amLondon
14h 57m
2 stops
SFO9:22 pmSan Francisco
$411
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from San Francisco to London, Ontario 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, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from San Francisco to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 10/30

1:00 pm-7:12 pm

1 stop27h 12m

London

Thu 11/6

8:10 pm-9:30 am

2 stops40h 20m

$381

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 2/19

7:30 am-9:21 pm

2 stops10h 51m

London

Fri 2/20

9:25 am-9:22 pm

2 stops14h 57m

$405

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 2/19

7:30 am-9:21 pm

2 stops10h 51m

London

Fri 2/20

9:25 am-9:22 pm

2 stops14h 57m

$411

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 2/19

8:30 am-9:21 pm

1 stop9h 51m

London

Fri 2/20

5:45 am-10:54 am

1 stop8h 09m

$419

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

Wed 2/18

12:43 am-9:21 pm

2 stops17h 38m

London

Fri 2/20

5:40 pm-1:28 am

2 stops10h 48m

$524

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 10/30

10:15 am-7:12 pm

3 stops29h 57m

London

Thu 11/6

8:10 pm-12:40 pm

2 stops19h 30m

$756

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from San Francisco to London, Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to London, Ontario?

According to our data, Friday is the cheapest day to fly to London, Ontario from San Francisco. The lowest ticket price found for a Friday departure recently was $503. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London, Ontario on Saturday is $817.

What is the cheapest time of day to depart on your flight to London, Ontario?

In the afternoon is the cheapest time of day to fly from San Francisco to London, Ontario when you can find flight prices for as low as $500. Flying to London, Ontario in the afternoon is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to London, Ontario, so prices are often more expensive at around $811 per ticket.

Can stopping save me money on San Francisco to London, Ontario flights?

You could potentially save up to 22% on your flight if you consider stops on a San Francisco to London, Ontario flight.

When to book flights from San Francisco to London, Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from San Francisco to London, Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap San Francisco to London, Ontario (SFO to YXU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Francisco to London, Ontario

Direct flights

None
There are no direct flights from San Francisco to London, Ontario. There are no popular flight routes from San Francisco to London, Ontario.
Search flight deals

  • How far is San Francisco to London by plane?

    San Francisco and London are 2173.0 mi apart from one another. Typically, this will take 9h 51m by plane in normal conditions.

  • When did momondo last update prices for flights from San Francisco Airport to London Airport?

    Prices for flights from San Francisco Airport to London Airport were last updated today.

  • How many operators does momondo search for flights from San Francisco Airport to London Airport?

  • How old do you have to be to fly from San Francisco Airport to London Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from San Francisco Airport to London Airport.

  • What documentation or ID do you need to fly to London Airport?

    The necessary travel and health documents for your London Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from San Francisco to London, Ontario?

Best airlines flying from San Francisco to London, Ontario

Compare and see reviews for airlines that fly from San Francisco to London, Ontario with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom $162Free CancellationRating
7.2
3,095 reviews
Search WestJet flights
Air CanadaPriceFrom $178Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom $186Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights

Traveling to a place near London?

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

Why use momondo?

Why should I use momondo to find a flight deal from San Francisco to London?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from San Francisco to London. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from San Francisco to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from San Francisco with this policy.

How can momondo help me find flights from San Francisco to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from San Francisco to London.

I’m not ready to book a flight from San Francisco to London right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to London from San Francisco. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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