Find flights
Deals
When to book
FAQs

Cheap flights from London to San Francisco from $821

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 17/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SFO
2 Aug — 9 Aug1
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

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 3 July 2026.

Fri 20/1106:30
LHR
-
SFO
1 stop13h 15m
Delta
Sat 28/1113:05
SFO
-
LHR
1 stop13h 25m
Delta
Deal found 28/6$899
Wed 9/1206:30
LHR
-
SFO
1 stop13h 15m
Delta
Thu 31/1206:00
SFO
-
LHR
1 stop17h 50m
Delta
Deal found 29/6$933
Thu 10/1206:30
LHR
-
SFO
1 stop13h 15m
Delta
Thu 31/1206:00
SFO
-
LHR
1 stop17h 50m
Delta
Deal found 29/6$935
Sun 13/1206:30
LHR
-
SFO
2 stops21h 32m
Delta
Thu 31/1213:50
SFO
-
LHR
1 stop12h 40m
Delta
Deal found 29/6$941
Wed 2/1206:30
LHR
-
SFO
1 stop13h 15m
KLM
Wed 9/1216:45
SFO
-
LHR
Nonstop10h 10m
KLM
Deal found 1/7$944
Wed 18/1106:30
LHR
-
SFO
1 stop13h 15m
Delta
Tue 1/1216:45
SFO
-
LHR
Nonstop10h 10m
Delta
Deal found 2/7$945
Thu 26/1106:30
LHR
-
SFO
1 stop13h 15m
Delta
Thu 3/1207:00
SFO
-
LHR
1 stop15h 50m
Delta
Deal found 28/6$946
Tue 17/1108:40
LHR
-
SFO
1 stop35h 05m
Delta
Tue 1/1208:55
SFO
-
LHR
1 stop18h 00m
Delta
Deal found 2/7$948
Sun 13/1206:30
LHR
-
SFO
1 stop13h 15m
Delta
Wed 6/116:45
SFO
-
LHR
Nonstop10h 10m
Delta
Deal found 29/6$952
Thu 10/1206:30
LHR
-
SFO
2 stops17h 32m
Delta
Fri 1/106:05
SFO
-
LHR
1 stop20h 25m
Delta
Deal found 29/6$954
Thu 26/1106:30
LHR
-
SFO
1 stop13h 15m
Delta
Tue 5/106:15
SFO
-
LHR
1 stop16h 50m
Delta
Deal found 29/6$955
Thu 24/909:25
LGW
-
SFO
1 stop14h 50m
SWISS
Mon 26/1020:25
SFO
-
LGW
1 stop14h 25m
SWISS
Deal found 28/6$968

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 3 July 2026.

Round-trip from

$899

One-way from

$821

Popular in

December

Cheapest in

February

Average price

$1,193
Delta
  • Delta
  • 20/11-28/11
  • 2 total stops
  • 26h 40m total
  • London to San Francisco
Search Deals
British Airways
  • British Airways
  • 17/9
  • 2 total stops
  • 24h 59m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($26 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($26 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 3 July 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

Wed 4/11

09:00-16:30

1 stop15h 30m

San Francisco

Sun 8/11

16:40-11:15

Nonstop10h 35m

$970

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 20/9

08:30-15:20

1 stop14h 50m

San Francisco

Tue 29/9

12:45-10:40

1 stop13h 55m

$977
Fastest return journey

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 14/9

12:45-15:45

Nonstop11h 00m

San Francisco

Tue 29/9

17:55-12:15

Nonstop10h 20m

$1,009

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Fri 4/9

09:25-16:35

1 stop15h 10m

San Francisco

Mon 7/9

14:40-17:50

2 stops19h 10m

$1,028

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Fri 20/11

16:40-14:45

1 stop30h 05m

San Francisco

Sat 28/11

16:35-10:05

2 stops33h 30m

$1,062

LondonSan Francisco

LCY - SFO

LCYSFO

London City

Thu 15/10

20:15-11:45

1 stop23h 30m

San Francisco

Fri 23/10

06:00-11:40

2 stops21h 40m

$1,071

LondonSan Francisco

LTN - SFO

LTNSFO

London Luton

Thu 13/8

17:30-14:30

2 stops29h 00m

San Francisco

Thu 20/8

16:30-00:50

2 stops24h 20m

$1,074

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Wed 16/9

09:25-18:31

2 stops17h 06m

San Francisco

Fri 25/9

14:40-17:50

2 stops19h 10m

$1,081

LondonSan Francisco

LGW - SFO

LGWSFO

London Gatwick

Thu 15/10

10:25-23:46

2 stops21h 21m

San Francisco

Fri 23/10

15:05-16:00

1 stop16h 55m

$1,093

LondonSan Francisco

LTN - SFO

LTNSFO

London Luton

Fri 28/8

17:10-14:40

3 stops29h 30m

San Francisco

Mon 31/8

16:45-22:50

2 stops22h 05m

$1,101

Flights are sorted by cheapest return flights first.

Deals found on 3/7

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 $793). Flying from London to San Francisco in December is currently the most expensive (average of $1,311). 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 3 July 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 3 July 2026.

The most flights from LON to SFO are scheduled on a Monday (42 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (42 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 12% of weekly flights between London and San Francisco have experienced delays in the past year, with the average delay time being 143 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?

Friday 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 61 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 42 daily inbound flights from London from 0 different airlines.

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

    For as low as $993, 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 (83%), Austrian Airlines (83%), United Airlines( 83%).

  • 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 $793). Flying from London to San Francisco in December is currently the most expensive (average of $1,311). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.