£373 Cheap United flights from San Francisco to London (SFO→LHR)

View £373 flight on Sat, 19 Sept 2026Opens in a new window

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United flights from San Francisco to London (SFO→LHR)

Prices were available within the past 7 days and start at £373 for one-way flights and £627 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, 3 Aug - Tue, 15 Sept
SFO
San Francisco
LHR
London
£627 Return, found 2 days ago
£627
Return
found 2 days ago
Select United flight, departing Mon, 3 Aug from San Francisco to London, returning Tue, 15 Sept, priced at £627 found 2 days ago

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Gatwick LGW. Average driving time to city centre is 52 minutes. Flights from £956
LGW
Gatwick
Average driving time to city centre52 min
Flights from £956
Select flight to London City LCY. Closest option available. Average driving time to city centre is 21 minutes. Flights from £928
LCY
London City
Closest
Average driving time to city centre21 min
Flights from £928

Find the cheapest month to fly from San Francisco (SFO) to London (LHR)

April is typically the cheapest month to fly

From £420 - £800 per traveller.

Frequently asked questions

How much is a United Airlines flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
You can discover budget-friendly return United Airlines flights from £627 from SFO to LHR by organising your results from "Price (lowest to highest)" on Expedia. Or look for deals from £373 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from SFO to LHR with United Airlines?
Browse for one-way or round-trip flights to London in January or February. You could find cheaper fares with United Airlines during these off-season months.
Does United Airlines fly nonstop from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Yes, you can travel from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) on any of United Airlines's 14 weekly direct flights. Use Expedia's "Nonstop" and "Airline" filters to find the United Airlines flight that'll land at LHR at a time that suits you.
How long does it take to fly from SFO to LHR with United Airlines?
It takes around 10h 35m to travel nonstop from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) with United Airlines.
Which day of the week has the most United Airlines flights from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
If flexibility is what you're after, Friday offers the most choice for United Airlines flights from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR). Take your pick of 2 different departures.
What airports does United Airlines fly into in London?
Heathrow Airport (LHR) is the primary London gateway for United Airlines flights from San Francisco Intl. Airport (SFO).
What type of plane does United Airlines fly from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Take a United Airlines flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR), and you'll probably board a Boeing 777. Keep in mind though, that the aircraft type can vary due to operational reasons.
Can I change or cancel my United Airlines flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Changes are often free within 24 hours of making your booking, but your airline may charge a fee after that time. For more details about altering your reservation, head to your "Trips," select your flight and click on "Manage Booking." If you'd like the freedom to make changes without being charged, apply the "Changes included" or "No cancel fee" filter when planning your next escape.

Travel information

Origin airport
San Francisco Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, Alaska Airlines, Austrian Airlines, British Airways, Brussels Airlines, Finnair, ITA Airways, Iberia, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Singapore Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, Virgin Atlantic, WestJet
Popular airline
Virgin Atlantic
Distance
8567 km
Average flight time
18 hours 27 mins

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