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Cheap flights from London to San Francisco from $720

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 24/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
15 Feb — 22 Feb1
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 Tuesday

Cheap 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 16 January 2026.

Round-trip from

$782

One-way from

$720

Popular in

July

Cheapest in

February

Average price

$988
SWISS
  • SWISS
  • 31/1-7/2
  • 3 total stops
  • 45h 30m total
  • London to San Francisco
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SWISS
  • SWISS
  • 24/3
  • 1 total stop
  • 29h 50m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($226 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease ($39 potential savings vs. average return price).
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Average for round-trip flights in January 2026
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Find 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 16 January 2026.

Mon 2/311:35
LHR
-
SFO
2 stops16h 35m
United Airlines
Mon 9/313:20
SFO
-
LHR
1 stop15h 30m
United Airlines
Deal found 15/1$782
Wed 28/109:50
LHR
-
SFO
1 stop13h 45m
British Airways
Sat 31/122:30
SFO
-
LHR
1 stop15h 40m
British Airways
Deal found 14/1$783
Sat 21/215:20
LHR
-
SFO
1 stop15h 44m
United Airlines
Sat 7/317:25
SFO
-
LHR
Nonstop10h 35m
United Airlines
Deal found 15/1$785
Fri 20/306:35
LHR
-
SFO
1 stop16h 15m
United Airlines
Sat 28/308:30
SFO
-
LHR
1 stop14h 05m
United Airlines
Deal found 15/1$788
Wed 8/408:40
LHR
-
SFO
1 stop15h 35m
United Airlines
Tue 14/419:30
SFO
-
LHR
Nonstop10h 40m
United Airlines
Deal found 14/1$789
Sat 7/307:50
LHR
-
SFO
1 stop15h 45m
British Airways
Sun 5/416:59
SFO
-
LHR
1 stop14h 06m
British Airways
Deal found 14/1$791
Thu 5/311:35
LHR
-
SFO
2 stops16h 35m
United Airlines
Sat 21/322:40
SFO
-
LHR
1 stop15h 20m
United Airlines
Deal found 14/1$792
Sat 14/207:50
LHR
-
SFO
1 stop15h 45m
British Airways
Sun 22/222:35
SFO
-
LHR
1 stop15h 35m
British Airways
Deal found 15/1$794
Tue 19/509:00
LHR
-
SFO
1 stop18h 00m
United Airlines
Tue 26/516:45
SFO
-
LHR
Nonstop10h 25m
United Airlines
Deal found 15/1$795
Sat 28/211:35
LHR
-
SFO
2 stops16h 35m
United Airlines
Sat 7/308:30
SFO
-
LHR
1 stop14h 00m
United Airlines
Deal found 14/1$797
Mon 25/506:30
LHR
-
SFO
1 stop14h 10m
United Airlines
Mon 1/610:25
SFO
-
LHR
1 stop15h 45m
United Airlines
Deal found 14/1$798
Sat 18/416:15
LHR
-
SFO
Nonstop11h 05m
United Airlines
Sat 25/419:30
SFO
-
LHR
Nonstop10h 40m
United Airlines
Deal found 15/1$800

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 16 January 2026.
Use the filters below to find and compare flights from London to San Francisco that are best for you.

Fly from

London

Fly to

San Francisco

Route

Depart

Return

Price

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 2/3

11:35-20:10

2 stops16h 35m

San Francisco

Mon 9/3

22:55-21:20

1 stop15h 25m

$782

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 13/2

15:20-23:04

1 stop15h 44m

San Francisco

Sat 21/2

12:50-07:25

Nonstop10h 35m

$785

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 12/2

11:35-20:10

2 stops16h 35m

San Francisco

Fri 20/2

16:15-13:30

1 stop13h 15m

$785

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 21/5

08:40-16:15

1 stop15h 35m

San Francisco

Mon 1/6

12:00-10:10

1 stop14h 10m

$788

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 7/3

07:50-15:35

1 stop15h 45m

San Francisco

Sun 5/4

16:59-15:05

1 stop14h 06m

$791

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 16/5

07:25-14:35

1 stop15h 10m

San Francisco

Sat 23/5

06:00-10:10

1 stop20h 10m

$794

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 14/2

07:50-15:35

1 stop15h 45m

San Francisco

Fri 20/2

10:36-08:15

1 stop13h 39m

$795

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 22/5

06:30-12:40

1 stop14h 10m

San Francisco

Mon 25/5

10:25-10:10

1 stop15h 45m

$795

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 28/2

11:35-20:10

2 stops16h 35m

San Francisco

Sat 7/3

08:30-06:30

1 stop14h 00m

$797

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 18/4

16:15-19:20

Nonstop11h 05m

San Francisco

Sat 2/5

12:55-07:25

Nonstop10h 30m

$798

Flights are sorted by cheapest return flights first.

Deals found on 15/1

Showing 1-10 of 60 results
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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

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

Use this chart to determine the optimal time to book a return flight from London to San Francisco. Price data was last updated on 9 January 2026.

The best time to book flights from London to San Francisco is 51 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.

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 $708). Flying from London to San Francisco in July is currently the most expensive (average of $891). 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 16 January 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 16 January 2026.

The most flights from LON to SFO are scheduled on a Monday (31 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (25 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 13% of weekly flights between London and San Francisco have experienced delays in the past year, with the average delay time being 141 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 Sunday 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, Virgin Atlantic have had the lowest number of delays on this route, with just 11% of flights being delayed.

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 19.0 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 30 daily inbound flights from London from 0 different airlines.

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

    For as low as $785, SWISS can have you in San Francisco from London in 15h 44m. 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 $708). Flying from London to San Francisco in July is currently the most expensive (average of $891). 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
Sausalito
Santa Cruz
Davis
Milpitas

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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.
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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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