Cheap Flights London – San Francisco from £256

Flight FAQs

• Which airlines offer the cheapest flights from London (LON) to San Francisco (SFO)?

  Based on Trip.com data, Wizz Air UK offers one-way fares as low as £256 on Cheapest nonstop routes (e.g. LTN to SFO on Mon, May 18), while Air Canada offers Cheapest nonstop round-trips from £378 departing on Wed, Apr 22 and returning on Mon, Apr 27.

• Which airlines offer direct flights from London to San Francisco?

  At the moment, you can catch a direct flight from London to San Francisco with the following airlines, including: United Airlines Virgin Atlantic British Airways Lufthansa Delta Air Lines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is the flight from London (LON) to San Francisco (SFO)?

  It takes about 11 hours 8 minutes to fly from London (LON) to San Francisco (SFO).

• When is the best time to book flights from London to San Francisco?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from London to San Francisco is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there per week from London to San Francisco?

  Based on Trip.com data in the past 4 weeks, there is 41 flight per week flying from London to San Francisco. You can check the weekly schedule for popular airlines on this route below: Air France: S/M/T/W/T/F/S -- AF9649 (13:04) SWISS: S/M/T/W/T/F/S -- LX3042 (11:02)

• How can I find the best deals on flights from London to San Francisco?

  To find best deals on flights from London to San Francisco, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, May 18, with one-way flights priced at just £256.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Delta Air Lines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for San Francisco travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When is the best time to book a flight from London to San Francisco to get the best price?

  The cheapest months to fly from London to San Francisco is September, when demand for travel is lower.

• Which upcoming date is the cheapest for flights from London to San Francisco?

  After crunching the numbers on our April flight calendar, it's currently cheapest to fly from London to San Francisco on April 30, 2026 with SWISS, with prices starting at £372.

• Which airports can I fly through when travelling to San Francisco from London?

  You can land at any one of the following hubs in San Francisco, with Heathrow Airport to San Francisco International Airport (LHR-SFO) is by far the most common option on this route: San Francisco International Airport (SFO).

• What is the time difference between London and San Francisco?

  The time difference between San Francisco and London is 8h.

• How can I change or cancel my flight ticket from London to San Francisco?

  Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.