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Cheap flights from London to San Francisco from $672

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 15/6. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
20 Mar — 27 Mar1
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 Tuesday and return on a Tuesday

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 18 February 2026.

Wed 15/408:40
LHR
-
SFO
1 stop15h 35m
United Airlines
Thu 30/416:35
SFO
-
LHR
Nonstop10h 35m
United Airlines
Deal found 18/2$706
Wed 25/309:00
LHR
-
SFO
1 stop15h 30m
United Airlines
Mon 6/412:50
SFO
-
LHR
Nonstop10h 35m
United Airlines
Deal found 16/2$708
Tue 24/218:40
LGW
-
SFO
1 stop29h 50m
SWISS
Tue 3/319:25
SFO
-
LGW
1 stop14h 25m
SWISS
Deal found 15/2$708
Wed 25/309:00
LHR
-
SFO
1 stop15h 30m
United Airlines
Sun 5/406:00
SFO
-
LHR
1 stop20h 10m
United Airlines
Deal found 16/2$709
Wed 15/413:30
LHR
-
SFO
1 stop14h 30m
Multiple Airlines
Thu 30/419:40
SFO
-
LHR
Nonstop10h 30m
Multiple Airlines
Deal found 18/2$711
Sun 15/307:50
LHR
-
SFO
1 stop16h 45m
British Airways
Mon 30/316:59
SFO
-
LHR
1 stop14h 06m
British Airways
Deal found 18/2$712
Tue 28/407:25
LHR
-
SFO
1 stop15h 05m
United Airlines
Sat 9/512:50
SFO
-
LHR
Nonstop10h 35m
United Airlines
Deal found 16/2$713
Mon 23/307:40
LHR
-
SFO
1 stop19h 55m
United Airlines
Tue 7/406:40
SFO
-
LHR
1 stop21h 40m
United Airlines
Deal found 16/2$715
Fri 17/406:30
LHR
-
SFO
1 stop14h 10m
Multiple Airlines
Fri 1/519:40
SFO
-
LHR
Nonstop10h 30m
Multiple Airlines
Deal found 16/2$716
Mon 27/408:40
LHR
-
SFO
1 stop15h 35m
United Airlines
Sun 7/605:00
SFO
-
LHR
1 stop23h 20m
United Airlines
Deal found 17/2$718
Tue 25/812:10
LHR
-
SFO
1 stop36h 05m
United Airlines
Mon 14/913:05
SFO
-
LHR
Nonstop10h 20m
United Airlines
Deal found 16/2$719
Sun 8/309:30
LHR
-
SFO
1 stop14h 25m
Multiple Airlines
Sun 22/320:25
SFO
-
LHR
1 stop14h 25m
Multiple Airlines
Deal found 15/2$720

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 18 February 2026.

Round-trip from

$706

One-way from

$672

Popular in

July

Cheapest in

February

Average price

$798

Good round-trip deal

$680 or less
United Airlines
  • United Airlines
  • 19/3-26/3
  • 3 total stops
  • 40h 58m total
  • London to San Francisco
Search Deals
LEVEL
  • LEVEL
  • 15/6
  • 1 total stop
  • 29h 10m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($187 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from London (LON) to San Francisco.
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 18 February 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 13/4

07:25-14:30

1 stop15h 05m

San Francisco

Mon 20/4

05:00-09:40

1 stop20h 40m

$708

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 14/4

12:10-16:15

1 stop36h 05m

San Francisco

Thu 30/4

19:40-14:10

Nonstop10h 30m

$708

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 13/4

06:55-14:30

1 stop15h 35m

San Francisco

Tue 28/4

19:30-14:10

Nonstop10h 40m

$709

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 20/3

09:00-17:30

1 stop15h 30m

San Francisco

Tue 7/4

08:10-06:30

1 stop14h 20m

$712

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 22/3

13:50-20:35

1 stop37h 45m

San Francisco

Sun 29/3

12:50-07:25

Nonstop10h 35m

$712

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 27/4

08:40-16:15

1 stop15h 35m

San Francisco

Fri 8/5

08:05-06:30

1 stop14h 25m

$712

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 22/3

13:50-20:35

1 stop37h 45m

San Francisco

Sun 10/5

05:00-11:35

1 stop22h 35m

$718

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 14/3

06:35-20:35

1 stop21h 00m

San Francisco

Sat 21/3

18:25-12:00

Nonstop10h 35m

$718

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 20/5

08:40-16:15

1 stop15h 35m

San Francisco

Wed 27/5

16:45-11:10

Nonstop10h 25m

$726

LondonSan Francisco

LCY - SFO

LCYSFO

London City

Tue 17/3

18:55-12:50

1 stop24h 55m

San Francisco

Tue 24/3

05:50-07:15

2 stops18h 25m

$825

Flights are sorted by cheapest return flights first.

Deals found on 17/2

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 13 February 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 $658). Flying from London to San Francisco in July is currently the most expensive (average of $842). 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 18 February 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 18 February 2026.

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 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 148 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, Virgin Atlantic have had the lowest number of delays on this route, with just 10% 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 31 daily inbound flights from London from 0 different airlines.

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

    For as low as $708, United Airlines can have you in San Francisco from London in 15h 05m. 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: KLM (79%), Air France (79%), Delta( 79%).

  • 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 $744, our data indicates the cheapest price to be $647. The most popular route (London Stansted - San Francisco), is priced around $621.

  • 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 $658). Flying from London to San Francisco in July is currently the most expensive (average of $842). 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

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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