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Cheap flights from London to San Francisco from C$ 642

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to San Francisco departing on 25/11. 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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Find the cheapest flights from London to San Francisco

Cheap round-trip flights

United Airlines Logo
6:30 a.m. - 5:45 p.m.LHR-SFO
19h 15m2 stops
United Airlines Logo
6:30 a.m. - 8:20 a.m.SFO-LHR
17h 50m1 stop
C$ 718United Airlines
Find Deal
Fri, 3 Oct - Sun, 12 Oct
United Airlines Logo
6:30 a.m. - 5:45 p.m.LHR-SFO
19h 15m2 stops
United Airlines Logo
1:25 p.m. - 11:10 a.m.SFO-LHR
13h 45m1 stop
C$ 719United Airlines
Find Deal
Wed, 1 Oct - Wed, 8 Oct
United Airlines Logo
6:30 a.m. - 5:45 p.m.LHR-SFO
19h 15m2 stops
United Airlines Logo
9:00 a.m. - 7:40 a.m.SFO-LHR
14h 40m1 stop
C$ 721United Airlines
Find Deal
Wed, 1 Oct - Wed, 8 Oct
Delta Logo
6:30 a.m. - 11:45 a.m.LHR-SFO
13h 15m1 stop
Delta Logo
4:30 p.m. - 10:40 a.m.SFO-LHR
10h 10mdirect
C$ 728Delta
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Tue, 7 Oct - Mon, 3 Nov
British Airways Logo
6:15 a.m. - 9:58 p.m.LHR-SFO
23h 43m2 stops
British Airways Logo
5:30 p.m. - 12:00 p.m.SFO-LHR
10h 30mdirect
C$ 732British Airways
Find Deal
Wed, 11 Feb - Fri, 6 Mar
Delta Logo
11:30 a.m. - 6:15 p.m.LHR-SFO
14h 45m1 stop
Delta Logo
4:05 p.m. - 10:25 a.m.SFO-LHR
10h 20mdirect
C$ 733Delta
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Fri, 3 Oct - Mon, 13 Oct
Austrian Airlines Logo
12:20 p.m. - 3:25 p.m.LHR-SFO
11h 05mdirect
Austrian Airlines Logo
8:25 a.m. - 6:20 a.m.SFO-LHR
13h 55m1 stop
C$ 736Austrian Airlines
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Sat, 27 Sep - Sat, 4 Oct
Multiple Airlines Logo
12:20 p.m. - 3:25 p.m.LHR-SFO
11h 05mdirect
Multiple Airlines Logo
1:02 p.m. - 10:40 a.m.SFO-LHR
13h 38m1 stop
C$ 737Multiple Airlines
Find Deal
Mon, 29 Sep - Wed, 15 Oct
British Airways Logo
8:20 a.m. - 6:35 p.m.LHR-SFO
18h 15m1 stop
British Airways Logo
11:59 p.m. - 6:50 a.m.SFO-LHR
22h 51m1 stop
C$ 746British Airways
Find Deal
Sat, 27 Sep - Sun, 2 Nov
Multiple Airlines Logo
6:30 a.m. - 12:40 p.m.LHR-SFO
14h 10m1 stop
Multiple Airlines Logo
12:50 p.m. - 7:25 a.m.SFO-LHR
10h 35mdirect
C$ 772Multiple Airlines
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Sun, 14 Dec - Sun, 18 Jan

British Airways flights from London to San Francisco

Our best British Airways deals on London to San Francisco flight tickets
British Airways
11 Feb
LHR6:15 a.m.London Heathrow
23h 43m
2 stops
SFO9:58 p.m.San Francisco
6 Mar
SFO5:30 p.m.San Francisco
10h 30m
LHR12:00 p.m.London Heathrow
C$ 732
Find similar
British Airways
27 Sep
LHR8:20 a.m.London Heathrow
18h 15m
1 stop
SFO6:35 p.m.San Francisco
2 Nov
SFO11:59 p.m.San Francisco
22h 51m
1 stop
LHR6:50 a.m.London Heathrow
C$ 746
Find similar
British Airways
22 Sep
LHR2:45 p.m.London Heathrow
14h 33m
1 stop
SFO9:18 p.m.San Francisco
5 Oct
SFO7:20 p.m.San Francisco
10h 25m
LHR1:45 p.m.London Heathrow
C$ 758
Find similar

Delta flights from London to San Francisco

Our best Delta deals on London to San Francisco flight tickets
Delta
24 Sep
LHR6:30 a.m.London Heathrow
13h 15m
1 stop
SFO11:45 a.m.San Francisco
3 Nov
SFO4:30 p.m.San Francisco
10h 10m
LHR10:40 a.m.London Heathrow
C$ 726
Find similar
Delta
7 Oct
LHR6:30 a.m.London Heathrow
13h 15m
1 stop
SFO11:45 a.m.San Francisco
3 Nov
SFO4:30 p.m.San Francisco
10h 10m
LHR10:40 a.m.London Heathrow
C$ 728
Find similar
Delta
1 Oct
LHR9:00 a.m.London Heathrow
17h 15m
1 stop
SFO6:15 p.m.San Francisco
5 Nov
SFO4:30 p.m.San Francisco
10h 10m
LHR10:40 a.m.London Heathrow
C$ 733
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from London to San Francisco 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 96,600 searches. Data last updated 17 September 2025.
Use the filters below to find and compare flights from London to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 3/10

6:30 a.m.-5:45 p.m.

2 stops19h 15m

San Francisco

Sun 12/10

6:30 a.m.-8:20 a.m.

1 stop17h 50m

C$ 718

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 1/10

6:30 a.m.-5:45 p.m.

2 stops19h 15m

San Francisco

Wed 8/10

1:25 p.m.-11:10 a.m.

1 stop13h 45m

C$ 719

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 1/10

6:30 a.m.-5:45 p.m.

2 stops19h 15m

San Francisco

Wed 8/10

9:00 a.m.-7:40 a.m.

1 stop14h 40m

C$ 721

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 7/10

6:30 a.m.-11:45 a.m.

1 stop13h 15m

San Francisco

Mon 3/11

4:30 p.m.-10:40 a.m.

Nonstop10h 10m

C$ 728

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 11/2

6:15 a.m.-9:58 p.m.

2 stops23h 43m

San Francisco

Fri 6/3

5:30 p.m.-12:00 p.m.

Nonstop10h 30m

C$ 732

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 3/10

11:30 a.m.-6:15 p.m.

1 stop14h 45m

San Francisco

Mon 13/10

4:05 p.m.-10:25 a.m.

Nonstop10h 20m

C$ 733

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 27/9

12:20 p.m.-3:25 p.m.

Nonstop11h 05m

San Francisco

Sat 4/10

8:25 a.m.-6:20 a.m.

1 stop13h 55m

C$ 736

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 29/9

12:20 p.m.-3:25 p.m.

Nonstop11h 05m

San Francisco

Wed 15/10

1:02 p.m.-10:40 a.m.

1 stop13h 38m

C$ 737

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 27/9

8:20 a.m.-6:35 p.m.

1 stop18h 15m

San Francisco

Sun 2/11

11:59 p.m.-6:50 a.m.

1 stop22h 51m

C$ 746

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 14/12

6:30 a.m.-12:40 p.m.

1 stop14h 10m

San Francisco

Sun 18/1

12:50 p.m.-7:25 a.m.

Nonstop10h 35m

C$ 772

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 San Francisco from

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

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 typical price of a round-trip flight between London and San Francisco?

What is the cheapest month to fly to San Francisco?

The cheapest month to fly to San Francisco from London is in February. Flight prices, which tend to average around C$ 777, are often lower during this time because this is during the off-season. The month of September is another great option to travel to San Francisco, with average flight prices from London averaging around C$ 791.

What is the cheapest day to depart on your flight to San Francisco?

The cheapest day to depart from London to San Francisco is on a Friday. Travellers who choose to depart for San Francisco on a Friday will often find tickets for as low as C$ 875. On the other hand, Tuesday is the most expensive day to depart from London because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 2,169.

What is the cheapest time of day to depart on your flight to San Francisco?

Flying to San Francisco from London at noon is the least expensive time of day to depart. momondo users have found prices as low as C$ 875 when looking at flights departing at noon. In contrast, the most expensive time of day to depart to San Francisco is in the morning when prices are around C$ 1,014.

What is the cheapest London to San Francisco flight route?

Fly from London Heathrow to San Francisco for the best London - San Francisco flight prices

How far in advance should I book a flight to San Francisco?

You are more likely to see cheaper flights to San Francisco from London when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around C$ 920 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from London for as low as C$ 852 on momondo.

What cabin class options are available on London to San Francisco flights?

There are 2 cabin classes available to choose from on London to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

You could potentially save up to 34% on your flight if you consider stops on a London to San Francisco flight.

How have London to San Francisco flight prices changed over time?

As of September 2025, prices for London to San Francisco flights are approximately 59% more expensive when compared to flights at the same time last year.

When to book flights from London to San Francisco

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

Cheap London to San Francisco (LON to SFO) flight deals and tips

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

Fastest flight time

11h 00m

Direct flights

Every day

Airports in San Francisco

1 airport
The fastest flight from London to San Francisco takes 11h 00m
Direct flights go from London to San Francisco every day.
There is 1 airport near San Francisco: San Francisco (SFO)
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  • How far is London to San Francisco by plane?

    The distance between London and San Francisco is about 8609.4 km. Flights usually cover this in 11h 00m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from London to San Francisco Airport refresh daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to San Francisco Airport.

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

    The travel and health documents required for your trip to San Francisco Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at San Francisco Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from London to San Francisco?

Best airlines flying from London to San Francisco

Compare and see reviews for airlines that fly from London to San Francisco with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom C$ 875Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights

  • United Airlines Flights From London to San Francisco

    United Airlines flight deals from London to San Francisco start from C$ 636 round-trip. Over the 21 United Airlines flights for this route in a normal week, average airfare is usually C$ 636 round-trip - but some users have found much cheaper deals with momondo.

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
San Mateo
Belmont
Los Altos
San Bruno
Santa Cruz
Newark
Fremont
Carmel-by-the-Sea
Turlock
South San Francisco
Mountain View
Half Moon Bay
Sunnyvale
Cupertino
Mill Valley
Los Banos
Palo Alto
Pacifica
Roseville
Woodland

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to San Francisco from London.

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

Yes. momondo allows you to filter the results for London to San Francisco flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between London and San Francisco by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Of course. momondo tracks the price of London to San Francisco flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your San Francisco trip

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