LON - SFO

Find cheap flights from London to San Francisco

1 adult
1 adult, Economy
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Track pricesNot ready to book? Create a price alert for when prices drop.

Free to useThere are no hidden charges or fees.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to San Francisco (LON-SFO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to San Francisco that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from London to San Francisco

American Airlines Logo
LHR-SFO
11h 05mnonstop
American Airlines Logo
SFO-LHR
10h 25mnonstop
American Airlines
Find Deal
KLM Logo
LHR-SFO
11h 00mnonstop
KLM Logo
SFO-LHR
10h 20mnonstop
Air Canada Logo
LHR-SFO
11h 15mnonstop
Air Canada Logo
SFO-LHR
10h 35mnonstop
Air Canada
Find Deal
Aer Lingus Logo
LHR-SFO
11h 05mnonstop
Aer Lingus Logo
SFO-LHR
10h 25mnonstop
Aer Lingus
Find Deal
Austrian Airlines Logo
LHR-SFO
11h 15mnonstop
Austrian Airlines Logo
SFO-LHR
10h 35mnonstop
Austrian Airlines
Find Deal
Air France Logo
LHR-SFO
11h 00mnonstop
Air France Logo
SFO-LHR
10h 20mnonstop
Air France
Find Deal
Delta Logo
LHR-SFO
11h 00mnonstop
Delta Logo
SFO-LHR
10h 20mnonstop
SWISS Logo
LHR-SFO
11h 15mnonstop
SWISS Logo
SFO-LHR
10h 35mnonstop
Air New Zealand Logo
LHR-SFO
11h 15mnonstop
Air New Zealand Logo
SFO-LHR
10h 35mnonstop
Air New Zealand
Find Deal
United Airlines Logo
LHR-SFO
11h 15mnonstop
United Airlines Logo
SFO-LHR
10h 35mnonstop
United Airlines
Find Deal
Alaska Airlines Logo
LHR-SFO
11h 05mnonstop
Alaska Airlines Logo
SFO-LHR
10h 25mnonstop
Alaska Airlines
Find Deal
Finnair Logo
LHR-SFO
11h 05mnonstop
Finnair Logo
SFO-LHR
10h 25mnonstop
Finnair
Find Deal
Iberia Logo
LHR-SFO
11h 05mnonstop
Iberia Logo
SFO-LHR
10h 25mnonstop
Iberia
Find Deal
Brussels Airlines Logo
LHR-SFO
11h 15mnonstop
Brussels Airlines Logo
SFO-LHR
10h 35mnonstop
Brussels Airlines
Find Deal
Lufthansa Logo
LHR-SFO
11h 15mnonstop
Lufthansa Logo
SFO-LHR
10h 35mnonstop
Lufthansa
Find Deal
Virgin Atlantic Logo
LHR-SFO
11h 00mnonstop
Virgin Atlantic Logo
SFO-LHR
10h 20mnonstop
Virgin Atlantic
Find Deal
British Airways Logo
LHR-SFO
11h 05mnonstop
British Airways Logo
SFO-LHR
10h 25mnonstop
British Airways
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by KAYAK users
Check your luggage allowance for both flight directions.
Allow extra time for immigration at San Francisco.
User tips
User tips
User tips
User tips
Top routes
LHR-SFO
Cheapest
LHR-SFO
Most popular
Insights
Insights
Insights
Insights
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 9% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 14% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
American Airlines
ו' 12.09
LHR - SFO • Non-stop
Cheapest one-way
American Airlines
ו' 12.09
LHR - SFO • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Francisco!
Booking Insights

KAYAK's insights & trends for London to San Francisco flights

Get data-powered insights and trends into flights from London to San Francisco to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest London to San Francisco flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from London to San Francisco costs ₪1,715 on the route between London Heathrow Airport (LHR) and San Francisco (SFO). It is also the most popular route.

What is the cheapest month to fly from London to San Francisco?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to San Francisco, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London to San Francisco is February, where tickets cost ₪1,905 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is ₪2,902 and ₪2,739 respectively.

Can I save money by flying with a layover from London to San Francisco?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of ₪1,715, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London to San Francisco, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from London to San Francisco, you should book around 4 weeks before departure, which saves you about 9% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low seasonJanuary
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly with an average 30% increase in price.

When to book flights from London to San Francisco

Are your dates flexible? Find out the best times to travel from London to San Francisco based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from London to San Francisco: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew the route from London to San Francisco 
AlastairFlew with British AirwaysLHR-SFOFeb 2025
Make sure your free checked luggage is for outward and return flights.
Verified travelerFlew with United AirlinesLHR-SFOSept 2024
Download all your music. Add shows and movies to your queue. Bring short so you can relax. Bring long charger cords.
Verified travelerFlew with American AirlinesLHR-SFOMar 2024
Heathrow is vast, allow plenty of time to drop bags and go through security. At San Francisco the immigration takes a bit of time and we had to wait around 1.5hrs, bare this in mind when booking car rental. The is a shuttle train from the airport to the car rental area which is very slick and efficient.
Ana-MariaFlew with IberiaLHR-SFOMar 2024
In London triple check your flight they have multiple leaving for the same destination once - it is easy to get them confused

FAQs for booking flights from London to San Francisco

  • Which airlines offer Wi-Fi service onboard planes from London to San Francisco?

    Only KLM offers inflight Wi-Fi service on the London to San Francisco flight route.

  • Which aircraft models fly most regularly from London to San Francisco?

    The Boeing 777 is the aircraft model that flies most regularly on the London to San Francisco flight route.

  • Which airline alliances offer flights from London to San Francisco?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between London and San Francisco, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from London to San Francisco?

    There are nonstop flights from London to San Francisco on a daily basis.

  • How does KAYAK find such low prices on flights from London to San Francisco?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to San Francisco.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to San Francisco?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from London is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London to San Francisco?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to London with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to San Francisco?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly non-stop from London to San Francisco?

 
Nonstop data is based off flight results for the next 60 days. Find direct flights from all airlines flying nonstop from London to San Francisco.
Find which airlines fly direct from London to San Francisco Airport, which days they fly and book direct flights.

Nonstop departures

London to San Francisco

Monday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Tuesday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Wednesday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Thursday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Friday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Saturday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Sunday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

See more direct flights

Nonstop returns

San Francisco to London

Monday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Tuesday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Wednesday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Thursday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Friday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Saturday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

Sunday

British Airways, United Airlines, Virgin Atlantic

British Airways, United Airlines, +1 more

See more direct flights

Everything you need to know for your flight from London to San Francisco

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights and car rentals with KAYAK.