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Cheap flights from London to San Francisco from $749

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 17/2. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
6 Dec — 13 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London to San Francisco are usually found in September or February, booked 51 days in advance, depart on a Wednesday or Sunday and return on a Monday

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 6 November 2025.

Round-trip from

$864

One-way from

$733

Popular in

July

Cheapest in

September

Average price

$932

Good round-trip deal

$2,196 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 4/12-8/12
  • 3 total stops
  • 52h 05m total
  • London to San Francisco
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SWISS
  • SWISS
  • 22/3
  • 1 total stop
  • 28h 25m total
  • London to San Francisco
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Highest demand for flights based on searches. 14% potential increase in price ($264 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease ($44 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from London (LON) to San Francisco.
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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 6 November 2025.

Thu 4/1216:00LGW - SFO
1 stop32h 05mTAP AIR PORTUGAL
Mon 8/1216:35SFO - LGW
2 stops20h 00mTAP AIR PORTUGAL
Deal found 5/11$864
Thu 20/1116:00LGW - SFO
1 stop32h 05mTAP AIR PORTUGAL
Mon 1/1216:35SFO - LGW
2 stops20h 00mTAP AIR PORTUGAL
Deal found 5/11$869
Sat 22/1115:35LHR - SFO
2 stops31h 00mScandinavian Airlines
Fri 5/1216:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 5/11$883
Mon 24/1106:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Sun 30/1116:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 5/11$892
Thu 20/1121:05LHR - SFO
2 stops25h 30mScandinavian Airlines
Fri 28/1116:40SFO - LHR
2 stops17h 50mScandinavian Airlines
Deal found 4/11$893
Thu 20/1115:35LHR - SFO
2 stops31h 00mScandinavian Airlines
Sun 30/1116:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 5/11$896
Sun 23/1110:35LHR - SFO
2 stops36h 00mScandinavian Airlines
Sat 29/1116:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 4/11$901
Sat 22/1115:35LHR - SFO
2 stops31h 00mScandinavian Airlines
Fri 28/1116:40SFO - LHR
2 stops17h 50mScandinavian Airlines
Deal found 4/11$907
Sat 22/1115:35LHR - SFO
2 stops31h 00mScandinavian Airlines
Sat 29/1116:40SFO - LHR
2 stops19h 15mScandinavian Airlines
Deal found 5/11$920
Thu 4/1206:40LHR - SFO
1 stop15h 55mScandinavian Airlines
Thu 8/116:40SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 5/11$921
Thu 20/1121:05LHR - SFO
2 stops25h 30mScandinavian Airlines
Thu 11/1216:40SFO - LHR
2 stops15h 45mScandinavian Airlines
Deal found 4/11$923
Thu 20/1121:05LHR - SFO
2 stops25h 30mScandinavian Airlines
Mon 1/1216:40SFO - LHR
2 stops15h 45mScandinavian Airlines
Deal found 5/11$924

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 6 November 2025.
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

Sat 21/2

06:40-14:35

1 stop15h 55m

San Francisco

Sun 1/3

16:40-17:40

1 stop17h 00m

$876

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 5/3

18:40-14:35

1 stop27h 55m

San Francisco

Mon 9/3

17:40-16:00

1 stop15h 20m

$890

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 17/3

06:40-15:35

1 stop15h 55m

San Francisco

Sun 22/3

17:40-17:40

1 stop17h 00m

$890

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 15/3

19:30-15:35

1 stop27h 05m

San Francisco

Sat 21/3

17:40-17:40

1 stop17h 00m

$892

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 17/1

10:35-14:35

2 stops36h 00m

San Francisco

Sun 18/1

16:40-17:40

1 stop17h 00m

$895

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 20/4

19:30-14:40

1 stop27h 10m

San Francisco

Mon 27/4

16:45-17:40

1 stop16h 55m

$901

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 2/12

17:30-14:35

2 stops53h 05m

San Francisco

Sun 11/1

16:40-16:00

1 stop15h 20m

$901

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 4/12

15:35-14:35

2 stops31h 00m

San Francisco

Sun 11/1

16:40-16:00

1 stop15h 20m

$901

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Sat 21/3

10:10-15:35

2 stops60h 25m

San Francisco

Fri 10/4

20:20-09:45

1 stop29h 25m

$913

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 4/12

06:40-14:35

1 stop15h 55m

San Francisco

Sat 10/1

16:40-16:00

1 stop15h 20m

$921

Flights are sorted by cheapest return flights first.

Deals found on 3/11

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 31 October 2025.

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, December is the cheapest month in which you can book a flight from London to San Francisco (average of $698). Flying from London to San Francisco in July is currently the most expensive (average of $944). 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 6 November 2025.

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 6 November 2025.

The most flights from LON to SFO are scheduled on a Monday (31 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (31 on average).

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

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 31 daily inbound flights from London from 0 different airlines.

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

    For as low as $890, Scandinavian Airlines can have you in San Francisco from London in 27h 55m. The distance between London and San Francisco is about 8610 km. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from London to San Francisco one-way?

    The cheapet airlines for a one-way flight from London to San Francisco are United Airlines ($770), Austrian Airlines ($770), and Lufthansa ($772).

  • 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 New Zealand (84%), Air Canada (82%), Austrian Airlines( 82%).

  • What are the cheapest flights from London to San Francisco?

    Looking for the cheapest flight from London to San Francisco? While on average our users pay $2,196, our data indicates the cheapest price to be $861. The most popular route (London Stansted - San Francisco), is priced around $676.

  • 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, December is the cheapest month in which you can book a flight from London to San Francisco (average of $698). Flying from London to San Francisco in July is currently the most expensive (average of $944). 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
Los Gatos
Mountain View
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.
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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