Cheap flights from London to San Francisco, CA, United States (LON - SFO)

Flying from London to San Francisco, CA can be expensive. Our search helps you compare cheap flights, airfare deals, and flight tickets across airlines and agencies so you can book at the best price.

We scan trusted travel agencies and airline booking systems for the route London - San Francisco, CA (LON - SFO). We do not sell tickets or add fees - you choose where to buy.

Airfares vary by date, time, and airport. Use filters to find the best option by departure/arrival time, number of stops, airline or alliance, and booking channel.

If your dates are flexible, check the low-fare calendar to find the cheapest days. Booking round-trip in one order often reduces fees, and prices usually rise as departure approaches.

We also recommend you to look through the prices for return tickets from San Francisco, CA to London.

Airfares found by our users in the past 24 hours

The cheapest flight from London to San Francisco, CA is £313 on Lufthansa, departing on 13/02/2026 - 12:30 and returning on 21/02/2026 - 03:15.
The price for these dates could change. Use search to get the best price.

Average round-trip airfares from London to San Francisco, CA by months

MonthRound-Trip
January 2026find now
February 202613.02 - 21.02from £313
March 202603.03 - 08.03from £336
April 2026find now
May 202613.05 - 24.05from £351
June 2026find now
July 202609.07 - 30.07from £370
August 202622.08 - 12.09from £409
September 2026find now
October 2026find now
November 2026find now
December 2026find now

Prices shown are based on searches from the last few days. Ticket prices can change and depend on availability at the time of booking.

Airlines are flying from London to San Francisco, CA

Iberia AirlinesBritish AirwaysVirgin Atlantic AirwaysUnited Airlines
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