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Cheap flights from San Francisco to London from $508

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 26/12. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — LON
30 Aug — 6 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from San Francisco to London are usually found in January or February, booked 23 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from San Francisco to London

Enter your travel dates to find the best prices.

Cheapest flights from San Francisco to London
Explore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 July 2026.

Wed 2/1216:35
SFO
-
LHR
1 stop16h 55m
TAP AIR PORTUGAL
Wed 9/1206:00
LHR
-
SFO
1 stop16h 45m
TAP AIR PORTUGAL
Deal found 29/7$977
Fri 13/1116:45
SFO
-
LHR
2 stops32h 10m
Scandinavian Airlines
Mon 16/1106:40
LHR
-
SFO
1 stop16h 10m
Scandinavian Airlines
Deal found 30/7$1,026
Mon 9/1117:35
SFO
-
LHR
1 stop34h 15m
United Airlines
Thu 12/1109:00
LHR
-
SFO
1 stop15h 30m
United Airlines
Deal found 28/7$1,040
Fri 9/1016:45
SFO
-
LHR
2 stops56h 10m
Scandinavian Airlines
Tue 13/1006:40
LHR
-
SFO
1 stop16h 00m
Scandinavian Airlines
Deal found 29/7$1,046
Thu 8/1016:45
SFO
-
LHR
2 stops32h 50m
Scandinavian Airlines
Sun 11/1006:40
LHR
-
SFO
2 stops40h 00m
Scandinavian Airlines
Deal found 29/7$1,051
Sun 22/1111:25
SFO
-
LHR
1 stop16h 25m
United Airlines
Tue 24/1109:00
LHR
-
SFO
1 stop15h 30m
United Airlines
Deal found 31/7$1,083
Wed 30/916:45
SFO
-
LHR
1 stop32h 35m
Scandinavian Airlines
Sat 3/1006:40
LHR
-
SFO
2 stops40h 00m
Scandinavian Airlines
Deal found 26/7$1,089
Sat 5/1216:45
SFO
-
LHR
2 stops15h 40m
Scandinavian Airlines
Sun 6/1218:40
LHR
-
SFO
1 stop28h 10m
Scandinavian Airlines
Deal found 29/7$1,119
Thu 17/914:30
SFO
-
LHR
2 stops39h 05m
Scandinavian Airlines
Sun 20/906:40
LHR
-
SFO
2 stops40h 00m
Scandinavian Airlines
Deal found 26/7$1,123
Thu 24/916:30
SFO
-
LHR
1 stop17h 15m
TAP AIR PORTUGAL
Mon 28/919:50
LHR
-
SFO
1 stop25h 45m
TAP AIR PORTUGAL
Deal found 27/7$1,126
Sat 22/817:36
SFO
-
LHR
2 stops38h 24m
Scandinavian Airlines
Mon 24/821:05
LHR
-
SFO
2 stops25h 35m
Scandinavian Airlines
Deal found 26/7$1,140

Find flight deals from San Francisco to London

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to London (LON). 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 31 July 2026.

Round-trip from

$977

One-way from

$508

Popular in

June

Cheapest in

January

Average price

$1,475

Good one-way deal

$656 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 2/12-9/12
  • 2 total stops
  • 33h 40m total
  • San Francisco to London
Search Deals
United Airlines
  • United Airlines
  • 26/12
  • 1 total stop
  • 34h 15m total
  • San Francisco to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($496 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($78 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a one-way flight from San Francisco to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from San Francisco to London 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 31 July 2026.
Use the filters below to find and compare flights from San Francisco to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Mon 16/11

16:40-11:15

Nonstop10h 35m

London Heathrow

Fri 20/11

11:10-19:35

1 stop16h 25m

$1,216

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Fri 6/11

16:45-09:35

2 stops32h 50m

London Heathrow

Sun 15/11

19:50-14:50

2 stops27h 00m

$1,233

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sun 20/9

16:45-18:30

1 stop17h 45m

London Heathrow

Sun 27/9

19:50-14:40

2 stops26h 50m

$1,269

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Mon 28/9

16:45-11:10

Nonstop10h 25m

London Heathrow

Wed 7/10

09:00-19:00

1 stop18h 00m

$1,272
Fastest return journey

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Tue 6/10

16:45-11:10

Nonstop10h 25m

London Heathrow

Wed 14/10

10:35-13:35

Nonstop11h 00m

$1,315

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Fri 27/11

16:45-09:35

2 stops32h 50m

London Heathrow

Fri 11/12

21:05-14:50

2 stops25h 45m

$1,322

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Wed 2/9

08:10-10:00

1 stop17h 50m

London Heathrow

Wed 9/9

07:25-19:00

1 stop19h 35m

$1,326

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Tue 1/9

08:10-06:30

1 stop14h 20m

London Heathrow

Tue 13/10

06:55-14:30

1 stop15h 35m

$1,328

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sun 6/9

18:25-17:35

1 stop15h 10m

London Heathrow

Thu 17/9

06:30-16:24

2 stops17h 54m

$1,342

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Sat 31/10

07:00-09:20

2 stops19h 20m

London Heathrow

Sun 1/11

21:05-14:50

2 stops25h 45m

$1,368

Flights are sorted by cheapest return flights first.

Deals found on 28/7

Showing 1-10 of 22 resultsSorted by cheapest first
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Best time to book a flight from San Francisco to London

Have a flexible travel schedule? Discover the best time to fly to London from San Francisco 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 San Francisco to London

What is the cheapest month to book a flight from San Francisco to London?

Currently, February is the cheapest month in which you can book a flight from San Francisco to London (average of $927). Flying from San Francisco to London in June is currently the most expensive (average of $1,831). 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 SFO to LON?

Find hourly flight availability from San Francisco to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 July 2026.

When flying from San Francisco to London, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 48% versus a flight in the morning.

Weekly flight availability from San Francisco to London

Explore weekly flight availability from San Francisco to London. 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 31 July 2026.

The most flights from SFO to LON are scheduled on a Wednesday (44 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (33 on average).

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

Airfare is typical for this route at the moment.
San Francisco to London flights typically cost between $944 and $1,452 in December.
The cheapest return price found within the last 5 days was $977 on TAP AIR PORTUGAL (2 Dec–9 Dec).

How often are flights from San Francisco to London delayed?

About 11% of weekly flights between San Francisco and London have experienced delays in the past year, with the average delay time being 151 minutes.

What is the most punctual flight time for San Francisco to London flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Monday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on San Francisco to London flights?

Over the past year, British Airways have had the lowest number of delays on this route, with just 8% of flights being delayed.

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

The best time to book flights from San Francisco to London is 38 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 San Francisco to London. 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 from for flights from San Francisco to London?

    Located just 17.7 km from the city centre, San Francisco is the airport most travellers will use when flying to London from San Francisco. Booking flights from San Francisco (SFO) to London should be relatively easy as there are 38 daily outbound flights to London from 0 different airlines.

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

    Scandinavian Airlines and Virgin Atlantic can get you from San Francisco to London in just under 10h 20m. Your travel time can differ by up to 45h 50m. Airlines will cover a distance of 8610 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most reliable airlines from San Francisco to London?

    Consider American Airlines (81%), Aer Lingus (81%) or Alaska Airlines (81%) when booking your flight. These represent the most reliable airlines when flying from San Francisco to London.

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

    Looking for the cheapest flight from San Francisco to London? While on average our users pay $656, our data indicates the cheapest price to be $621. The most popular route (San Francisco - London Heathrow), is priced around $1,186.

  • Can I find deals for flights from San Francisco to London that include hotel bookings?

    Yes. In addition to deals on San Francisco to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to London.

  • Can I find deals for business class flights from San Francisco to London?

    Yes. Cheapflights offers flight deals from San Francisco to London 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 San Francisco to London?

    Currently, February is the cheapest month in which you can book a flight from San Francisco to London (average of $927). Flying from San Francisco to London in June is currently the most expensive (average of $1,831). 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 London?

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Orpington
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Alternative routes for San Francisco to London

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Los Angeles to Heathrow 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 San Francisco to London?

Deals for San Francisco to London flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from San Francisco to London?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from San Francisco to London.

Can Cheapflights find flights from San Francisco to London with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from San Francisco to London flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from San Francisco to London become cheaper?

Yes, Cheapflights offers price alerts on San Francisco to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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