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Cheap flights from London to San Francisco from $831

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
29 Jun — 6 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to San Francisco are usually found in February or September, booked 51 days in advance, depart on a Wednesday or Sunday and return on a Monday

Cheap flight deals from London to San Francisco

Enter your travel dates to find the best prices.

Cheapest flights from London to San Francisco
Explore the most affordable flight options available from London to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 May 2026.

Thu 5/1109:00
LHR
-
SFO
1 stop15h 30m
United Airlines
Thu 19/1111:25
SFO
-
LHR
1 stop16h 25m
United Airlines
Deal found 26/5$962
Wed 4/1119:50
LHR
-
SFO
2 stops27h 00m
Scandinavian Airlines
Mon 9/1116:45
SFO
-
LHR
1 stop17h 45m
Scandinavian Airlines
Deal found 25/5$966
Wed 25/1121:05
LHR
-
SFO
2 stops25h 45m
Scandinavian Airlines
Wed 2/1216:45
SFO
-
LHR
1 stop16h 55m
Scandinavian Airlines
Deal found 25/5$970
Sun 22/1121:05
LHR
-
SFO
2 stops25h 45m
Scandinavian Airlines
Sun 29/1116:45
SFO
-
LHR
2 stops15h 40m
Scandinavian Airlines
Deal found 25/5$976
Fri 30/1009:00
LHR
-
SFO
1 stop15h 30m
United Airlines
Fri 6/1116:21
SFO
-
LHR
1 stop13h 09m
United Airlines
Deal found 29/5$987
Sat 28/1111:10
LHR
-
SFO
1 stop16h 25m
United Airlines
Sat 5/1208:45
SFO
-
LHR
1 stop16h 25m
United Airlines
Deal found 28/5$991
Tue 29/906:30
LHR
-
SFO
1 stop14h 10m
Lufthansa
Tue 6/1012:55
SFO
-
LHR
Nonstop10h 30m
Lufthansa
Deal found 28/5$993
Wed 16/913:30
LHR
-
SFO
1 stop14h 20m
Lufthansa
Tue 29/913:50
SFO
-
LHR
1 stop14h 05m
Lufthansa
Deal found 28/5$994
Wed 30/906:30
LHR
-
SFO
1 stop14h 10m
Lufthansa
Wed 7/1019:45
SFO
-
LHR
Nonstop10h 25m
Lufthansa
Deal found 29/5$995
Tue 8/919:50
LHR
-
SFO
2 stops26h 50m
Scandinavian Airlines
Thu 8/1016:45
SFO
-
LHR
2 stops18h 05m
Scandinavian Airlines
Deal found 26/5$1,000
Wed 4/1119:50
LHR
-
SFO
2 stops27h 00m
Scandinavian Airlines
Tue 10/1116:45
SFO
-
LHR
2 stops18h 05m
Scandinavian Airlines
Deal found 27/5$1,002
Tue 9/621:15
LGW
-
SFO
2 stops25h 20m
TAP AIR PORTUGAL
Mon 2/1116:35
SFO
-
LGW
1 stop15h 10m
TAP AIR PORTUGAL
Deal found 27/5$1,011

Find flight deals from London to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to San Francisco (SFO). 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 30 May 2026.

Round-trip from

$962

One-way from

$831

Popular in

December

Cheapest in

February

Average price

$1,020
United Airlines
  • United Airlines
  • 5/11-19/11
  • 2 total stops
  • 31h 55m total
  • London to San Francisco
Search Deals
Lufthansa
  • Lufthansa
  • 18/9
  • 1 total stop
  • 14h 05m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($34 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise 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, Cheapflights users made 647,157 searches. Data last updated 30 May 2026.
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

Cheapest return flight

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 29/10

06:35-20:35

1 stop21h 00m

San Francisco

Thu 5/11

12:50-07:25

Nonstop10h 35m

$991

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 27/9

09:30-20:47

1 stop19h 17m

San Francisco

Sun 4/10

05:00-12:35

1 stop23h 35m

$1,016

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 5/11

13:45-16:55

Nonstop11h 10m

San Francisco

Thu 19/11

08:25-07:10

1 stop14h 45m

$1,019

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 24/6

11:45-11:45

1 stop32h 00m

San Francisco

Mon 13/7

08:55-06:45

1 stop13h 50m

$1,046

LondonSan Francisco

LTN - SFO

LTNSFO

London Luton

Wed 1/7

20:35-16:15

2 stops27h 40m

San Francisco

Wed 8/7

08:10-14:25

2 stops22h 15m

$1,064

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 31/8

06:30-11:45

1 stop13h 15m

San Francisco

Mon 7/9

17:55-12:15

Nonstop10h 20m

$1,066

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Wed 2/9

21:15-14:30

2 stops25h 15m

San Francisco

Thu 17/9

16:30-11:20

2 stops34h 50m

$1,068

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 30/6

12:45-15:45

Nonstop11h 00m

San Francisco

Tue 7/7

17:55-12:15

Nonstop10h 20m

$1,068
Fastest return journey

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 25/6

12:45-15:45

Nonstop11h 00m

San Francisco

Thu 2/7

23:15-17:30

Nonstop10h 15m

$1,083

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 1/7

17:45-00:06

1 stop14h 21m

San Francisco

Tue 7/7

16:39-15:00

1 stop14h 21m

$1,093

Flights are sorted by cheapest return flights first.

Deals found on 27/5

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from London to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from London with our price prediction graph.
Estimated return 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 London to San Francisco

What is the cheapest month to book a flight from London to San Francisco?

Currently, February is the cheapest month in which you can book a flight from London to San Francisco (average of $751). Flying from London to San Francisco in December is currently the most expensive (average of $1,303). 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.

What is the cheapest time of day to fly from LON to SFO?

Find hourly flight availability from London to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 30 May 2026.

When flying from London to San Francisco, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from London to San Francisco

Explore weekly flight availability from London to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 30 May 2026.

The most flights from LON to SFO are scheduled on a Tuesday (42 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (36 on average).

How much does it cost for a return flight from London to San Francisco?

How often are flights from London to San Francisco delayed?

About 11% of weekly flights between London and San Francisco have experienced delays in the past year, with the average delay time being 144 minutes.

What is the most punctual flight time for London to San Francisco flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to San Francisco flights?

Over the past year, United Airlines have had the lowest number of delays on this route, with just 10% of flights being delayed.

How far ahead should I book a flight from London to San Francisco?

The best time to book flights from London to San Francisco is 78 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Related info for your journey

Find useful and relevant information for your journey from London to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to San Francisco from London?

    Located just 17.7 km from the city centre, San Francisco is the airport most travellers will use when flying to San Francisco from London. Booking flights from London to San Francisco (SFO) should be relatively easy as there are 40 daily inbound flights from London from 0 different airlines.

  • How long is the flight from London to San Francisco?

    For as low as $1,036, United Airlines can have you in San Francisco from London in 11h 10m. The distance between London and San Francisco is about 8610 km. This flight may include one or multiple stops.

  • What are the most popular routes from London to San Francisco?

    Most travellers choose London Stansted - San Francisco, London Luton - San Francisco or London Southend - San Francisco when deciding on the best route from London to San Francisco.

  • What are the most reliable airlines from London to San Francisco?

    Before booking your flight to San Francisco from London, have a look at the most reliable airlines to get you to your destination on time: Air Canada (88%), Austrian Airlines (88%), United Airlines( 88%).

  • Can I find deals for flights from London to San Francisco that include hotel bookings?

    Yes. In addition to deals on London to San Francisco flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to San Francisco.

  • Can I find deals for business class flights from London to San Francisco?

    Yes. Cheapflights offers flight deals from London to San Francisco 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 London to San Francisco?

    Currently, February is the cheapest month in which you can book a flight from London to San Francisco (average of $751). Flying from London to San Francisco in December is currently the most expensive (average of $1,303). 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 San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Sausalito
Davis
Milpitas
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Los Angeles flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from London to San Francisco. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from London to San Francisco?

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 San Francisco from London.

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

Certainly. Search results for flights to San Francisco from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to San Francisco from London today and book when prices fit your budget.

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