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Cheap flights from London to San Francisco from $730

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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
8 Feb — 15 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 9 January 2026.

Round-trip from

$809

One-way from

$730

Popular in

July

Cheapest in

February

Average price

$994
United Airlines
  • United Airlines
  • 6/4-27/4
  • 2 total stops
  • 32h 50m total
  • London to San Francisco
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British Airways
  • British Airways
  • 14/5
  • 2 total stops
  • 36h 49m total
  • London to San Francisco
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Highest demand for flights based on searches. 13% potential increase in price ($225 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 9 January 2026.

Mon 6/406:30LHR - SFO
1 stop14h 10mUnited Airlines
Mon 27/405:00SFO - LHR
1 stop18h 40mUnited Airlines
Deal found 8/1$809
Sun 12/408:30LHR - SFO
1 stop34h 15mUnited Airlines
Sun 19/406:40SFO - LHR
1 stop19h 00mUnited Airlines
Deal found 8/1$810
Fri 6/211:35LHR - SFO
2 stops16h 32mUnited Airlines
Fri 13/216:15SFO - LHR
1 stop13h 15mUnited Airlines
Deal found 8/1$812
Mon 26/114:25LHR - SFO
2 stops34h 05mSWISS
Wed 4/219:25SFO - LHR
2 stops18h 00mSWISS
Deal found 8/1$819
Sat 17/106:00LHR - SFO
1 stop18h 30mSWISS
Fri 30/119:25SFO - LHR
2 stops28h 50mSWISS
Deal found 8/1$821
Fri 15/510:35LHR - SFO
Nonstop11h 05mUnited Airlines
Mon 25/513:00SFO - LHR
Nonstop10h 25mUnited Airlines
Deal found 8/1$822
Thu 26/211:35LHR - SFO
2 stops16h 35mUnited Airlines
Thu 12/315:40SFO - LHR
1 stop14h 10mUnited Airlines
Deal found 7/1$824
Wed 14/114:25LHR - SFO
2 stops34h 05mSWISS
Tue 17/219:25SFO - LHR
2 stops18h 00mSWISS
Deal found 7/1$825
Sat 18/416:15LHR - SFO
Nonstop11h 05mUnited Airlines
Sat 25/416:35SFO - LHR
Nonstop10h 35mUnited Airlines
Deal found 8/1$827
Mon 27/410:45LHR - SFO
Nonstop11h 05mBritish Airways
Wed 20/516:35SFO - LHR
Nonstop10h 25mBritish Airways
Deal found 8/1$828
Sat 2/516:15LHR - SFO
Nonstop11h 05mUnited Airlines
Sat 16/519:40SFO - LHR
Nonstop10h 30mUnited Airlines
Deal found 8/1$831
Thu 27/809:25LGW - SFO
1 stop14h 50mSWISS
Thu 3/919:35SFO - LGW
1 stop14h 15mSWISS
Deal found 8/1$855

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 9 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

Fri 6/2

11:35-20:07

2 stops16h 32m

San Francisco

Fri 13/2

16:15-13:30

1 stop13h 15m

$812

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 19/1

19:30-16:30

2 stops53h 00m

San Francisco

Mon 26/1

11:45-16:20

2 stops20h 35m

$822

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 9/6

09:00-19:00

1 stop18h 00m

San Francisco

Tue 16/6

22:35-10:10

1 stop27h 35m

$822

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 18/4

10:35-13:40

Nonstop11h 05m

San Francisco

Sat 25/4

16:35-11:10

Nonstop10h 35m

$830

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 2/5

16:15-19:20

Nonstop11h 05m

San Francisco

Sat 16/5

19:40-14:10

Nonstop10h 30m

$831

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 2/2

07:00-16:30

2 stops17h 30m

San Francisco

Sun 8/2

19:25-13:40

2 stops34h 15m

$833

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 11/5

14:50-23:02

2 stops16h 12m

San Francisco

Mon 18/5

12:00-10:10

1 stop14h 10m

$834

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 9/4

10:35-13:40

Nonstop11h 05m

San Francisco

Thu 16/4

12:55-07:25

Nonstop10h 30m

$842

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 22/6

06:30-16:58

2 stops18h 28m

San Francisco

Tue 7/7

08:40-10:10

1 stop17h 30m

$842

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 24/6

06:30-18:28

2 stops19h 58m

San Francisco

Wed 8/7

12:00-10:10

1 stop14h 10m

$842

Flights are sorted by cheapest return flights first.

Deals found on 7/1

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 2 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 $707). 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 9 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 9 January 2026.

The most flights from LON to SFO are scheduled on a Monday (31 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (26 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 $822, United Airlines can have you in San Francisco from London in 18h. 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 $707). 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

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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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