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Cheap Flights from San Francisco International to London

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Compare San Francisco International to London flight deals

Find the cheapest month or even day of the year to fly to London

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Flight deals from San Francisco International to London

Looking for a cheap last-minute deal or the best round-trip flight from San Francisco International to London? Find the lowest prices on one-way and round-trip tickets right here.
London.$352 per passenger.Departing Thu, Aug 7.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from San Francisco International on Thu, Aug 7, arriving in London Heathrow.Price includes taxes and charges.From $352, select.
London.$352 per passenger.Departing Thu, Jul 31.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from San Francisco International on Thu, Jul 31, arriving in London Heathrow.Price includes taxes and charges.From $352, select.
London.$355 per passenger.Departing Wed, Oct 1.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departing from San Francisco International on Wed, Oct 1, arriving in London Gatwick.Price includes taxes and charges.From $355, select.
London.$414 per passenger.Departing Tue, Sep 30.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departing from San Francisco International on Tue, Sep 30, arriving in London Gatwick.Price includes taxes and charges.From $414, select.
London.$430 per passenger.Departing Tue, Apr 29.One-way flight with Condor.Outbound indirect flight with Condor, departing from San Francisco International on Tue, Apr 29, arriving in London Heathrow.Price includes taxes and charges.From $430, select.
London.$464 per passenger.Departing Sun, Jun 8.One-way flight with WestJet.Outbound indirect flight with WestJet, departing from San Francisco International on Sun, Jun 8, arriving in London Gatwick.Price includes taxes and charges.From $464, select.
London.$487 per passenger.Departing Wed, May 28.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from San Francisco International on Wed, May 28, arriving in London Stansted.Price includes taxes and charges.From $487, select.
London.$500 per passenger.Departing Wed, Mar 11.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from San Francisco International on Wed, Mar 11, arriving in London Stansted.Price includes taxes and charges.From $500, select.

When is the cheapest time to fly from San Francisco International to London?

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Francisco International to London flights are currently cheapest in July.
Apr
from $430
May
from $487
Jun
from $464
Jul
from $352
Aug
from $352
Sep
from $414
Oct
from $355
Nov
from $507
Dec
from $511
Jan
from $501
Feb
from $579
Mar
from $500

Direct flights from San Francisco International to London

Alternative San Francisco International to London routes

Looking for the cheapest, fastest or easiest route from San Francisco International to London? You could fly into the following airports instead.

San Francisco to London: Flight information

The things to know before you go.
Cheapest flight found$352
Cheapest month to flyJuly
Average flight time10 hrs, 31 mins
Most popular airlineAir New Zealand
Average flights per week289

Finding cheap flights from San Francisco International to London: Frequently asked questions

There are 6 airports in London: London City, London Heathrow, London Gatwick, London Luton, London Stansted, and London Southend.
The best price we found for a round-trip flight from San Francisco International to London is $840. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
10 hours and 31 minutes is the average flight time from San Francisco International to London.
Air New Zealand, KLM and Air Canada fly direct from San Francisco International to London.
There are 578 flights per week flying from San Francisco International to London, as of April 2025.
The cheapest month to fly from San Francisco International to London is usually April 2025.
If you're flying from San Francisco International Airport, the cheapest airport near London is London Gatwick – which is 40.3 km away from the center of London. We've found flights to this airport from $840.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Francisco International Airport to London on Tuesday, September 23, 2025.
Yes – the average flight time is 10 hours and 31 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to London but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to London is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 9°C. August is typically the warmest month in London, when it usually averages around 22°C. You can expect the least rain in March. The coldest month is January, with temperatures averaging 1°C. The rainiest month is October.
Currently, TAP Air Portugal and Brussels Airlines offer the cheapest flight tickets to London.

How to find cheap flights to London from San Francisco International

Looking for cheap tickets from San Francisco International to London? Here are a few tips on how to secure the best flight price and make your journey as smooth as possible.

  • Simply hit "search." From Delta Air Lines to international carriers like Emirates, we compare all major airlines along with the most popular online travel agents to find the cheapest plane tickets from San Francisco International to London. And with us, there are no hidden fees – what you see is what you pay.
  • Compare flight deals to London from San Francisco International from over 1,000 providers. Then choose the cheapest plane tickets or fastest journeys.
  • Flex your dates to find the best San Francisco International–London ticket prices. If you're flexible when it comes to your travel dates, use Skyscanner's "Whole month" tool to find the cheapest month, and even day to fly to London from San Francisco International.
  • Set up a Price Alert. You can easily track the fare of your cheap San Francisco International–London flights by creating an alert. Whenever prices go down or up, you'll get an email or push notification to help make sure you get the best possible flight deal.
  • Fly without stops. Only interested in direct flights between San Francisco International and London? Make sure to tick "Direct flights only" when performing a search. If there are direct flights available on the route, these will appear in the results.
  • Find the cheapest Business Class flights from San Francisco International and London. We scour the Internet for the best Business, Premium Economy and First Class flight fares to London, too. Check the difference in price as you search – you might just stumble on a last-minute low fare. Note that not all cabin classes are available for every destination or airline.
  • Include nearby airports in your search. Widen your search for San Francisco International to London flight deals by selecting the "add nearby airports" option. This will allow you to see flight prices for all the nearest airports at your departure point and your destination and could help you save the next time you travel.

    • Combine your flight to London from San Francisco International with hotels and car rental

    Once you've secured your cheap flight ticket from San Francisco International to London, discover the best prices and exclusive rates for hotels in London or nearby. You can also compare hundreds of car rental companies at once so you get the best car rental price for your trip.


Plan the rest of your trip from San Francisco to London

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.