$433 Cheap United flights San Francisco (SFO) to London (LHR)

Apply the “Price (lowest to highest)” filter on Expedia to look for cheap United Airlines round-trip flights from $571 from SFO to LHR. Affordable one-way fares from $433 are also available.**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.

January is one of the cheapest months to jet away to London with United Airlines. You could also find great deals on one-way and return tickets in February.

Scoring the best United Airlines deals from SFO to LHR is typically all about timing. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. Better still, you can pocket 17% on average by buying your fare on a Sunday compared to a Friday, which is often the most expensive day to book.* It’s a good idea to start checking out flights about one month before you want to travel.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Skip the layovers and fly from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) on any of United Airlines’s 14 direct weekly flights. Use Expedia’s “Nonstop” and “Airline” filters to find the United Airlines flight that’ll arrive at LHR at a time that suits you.

On average, it takes 10h 35m to travel nonstop from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) with United Airlines.

Friday has the most United Airlines flights from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR). With 2 daily departures, this is a great day to find something that will suit your plans.

The earliest flight from SFO to LHR with United Airlines leaves at 12:50PM UTC-8. You’ll touch down at 7:25AM UTC+0. The final United Airlines flight of the day takes off at 5:25PM UTC-8 and arrives at 12:00PM UTC+0. With 20% fewer cancellations for early and mid-morning flights, beginning your travel day early is typically the smartest choice.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

United Airlines flights from San Francisco Intl. Airport (SFO) to London arrive at Heathrow Airport (LHR). This is the main entry point here.

Depart from SFO to LHR with United Airlines and you can look forward to a range of benefits starting with a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you could also earn OneKeyCash™* to use on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

United Airlines generally operates Boeing 777 planes for flights from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR). Keep in mind that aircraft type can change depending on operational requirements, so the plane you board might be different on your travel date.

Changes are generally free within 24 hours of booking, but your airline may charge you after that. For more details about altering your reservation, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your plans without additional charges, check the “No cancel fee” or “Changes included” filter when planning your trip.