$1,338 Cheap United flights London (LHR) to San Francisco (SFO)

View $1,338 flight on Sun, Mar 15, 2026Opens in a new window

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$1,338 Cheap United flights London (LHR) to San Francisco (SFO)

Prices were available within the past 7 days and start at $1,338 for one-way flights and $540 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Sep 22 - Sat, Sep 27
LHR
London
SFO
San Francisco
$540 Roundtrip, found 9 hours ago
$540
Roundtrip
found 9 hours ago
Select United flight, departing Mon, Sep 22 from London to San Francisco, returning Sat, Sep 27, priced at $540 found 9 hours ago
Flights from London (LHR) to San Francisco (SFO)
Origin airport
Heathrow
Destination airport
San Francisco Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic, WestJet
Popular airline
Lufthansa
Distance
5354 mi
Average flight time
3 hours 2 mins

Frequently asked questions

How much is a United Airlines flight from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO)?
You'll find affordable round-trip United Airlines flights from $540 from LHR to SFO by filtering your results from "Price (lowest to highest)" on Expedia. Or look for deals from $1,338 for a one-way journey.**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 LHR to SFO with United Airlines?
Browse for one-way or round-trip flights to San Francisco in February or April. You could find an affordable fare with United Airlines during these quieter months.
What is the cheapest time to book flights from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO) with United Airlines?
To find affordable flights from LHR to SFO with United Airlines, start searching about one month before your planned departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**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.
Does United Airlines fly nonstop from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO)?
Yes, you can fly from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO) on any of United Airlines's 14 direct weekly flights. Apply our "Nonstop" and "Airline" filters to find the United Airlines flight that'll land at SFO at your preferred time.
How long does it take to fly from LHR to SFO with United Airlines?
Leave Heathrow Airport (LHR) for San Francisco Intl. Airport (SFO) on a direct United Airlines flight, and you'll be airborne for approximately 11h 10m.
Which day of the week has the most United Airlines flights from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO)?
If it's flexibility you're after, Wednesday offers the most choice for United Airlines flights from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO). You can pick from 2 different departures.
What is the earliest United Airlines flight from LHR to SFO?
Departing LHR at 10:05AM UTC+0, the earliest United Airlines flight to SFO lands at 1:15PM UTC-8. Traveling earlier in the day means you'll be less likely to encounter cancellations or delays.* After something later? The last United Airlines flight from LHR to SFO departs at 1:45PM UTC+0 and touches down at 4:55PM UTC-8.*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.
What airports does United Airlines fly into in San Francisco?
Jump on a United Airlines flight from Heathrow Airport (LHR) to San Francisco, and you'll probably arrive at San Francisco Intl. Airport (SFO). This is the airline's primary hub here.
Why fly with United Airlines from LHR to SFO?
With a rewarding loyalty program, United Airlines is a favorite of many passengers journeying from LHR to SFO. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO)?
Catch a United Airlines flight from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO), and you'll probably board a Boeing 777. Bear in mind though, that the aircraft type can vary depending on operational reasons.
Can I change or cancel my United Airlines flight from Heathrow Airport (LHR) to San Francisco Intl. Airport (SFO)?
Depending on the type of fare you purchased, a fee generally applies if you cancel or change your booking more than 24 hours after confirmation. To secure tickets with more flexibility, select our "Changes included" and "No cancel fee" boxes while searching for flights. For more details on canceling or modifying your reservation, visit "Trips," select your flight and click on "Manage Booking."

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