Cheap Flights from San Francisco to London from $321

Frequently Asked Questions

• What are the cheapest flights from San Francisco to London (SFO-LON)?

  Based on Trip.com data, WestJet offers one-way fares as low as $321 on Cheapest nonstop routes (e.g. SFO to LHR on Thu, Apr 23), while Scandinavian Airlines offers Cheapest nonstop round-trips from $542 departing on Mon, Apr 27 and returning on Thu, Apr 30.

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

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

• How long does it take to fly from San Francisco (SFO) to London (LON) and what is the distance?

  It takes around 10 hours 30 minutes to fly from San Francisco (SFO) to London (LON).

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

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from San Francisco to London 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 San Francisco to London?

  Based on Trip.com data in the past 4 weeks, there is 35 flight per week flying from San Francisco to London. You can check the weekly schedule for popular airlines on this route below: British Airways: S/M/T/W/T/F/S -- BA284 (17:22)

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

  To find best deals on flights from San Francisco to London, 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 Thu, Apr 23, with one-way flights priced at just $321.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is United Airlines.
  · 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 London travel is around December.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from San Francisco (SFO) to London (LON) the cheapest?

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

• Which upcoming date is cheapest to fly from San Francisco to London on?

  After crunching the numbers on our April flight calendar, it's currently cheapest to fly from San Francisco to London on April 16, 2026 with Level, with prices starting at $227.

• Which airports can I fly to for London from San Francisco?

  You can land at any one of the following hubs in London, with San Francisco International Airport to Heathrow Airport (SFO-LHR) is by far the most common option on this route: Heathrow Airport (LHR) London Gatwick Airport (LGW) London City Airport (LCY) London Luton Airport (LTN) London Stansted Airport (STN) London Southend Airport (SEN).

• Is there any time difference between San Francisco and London?

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

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

  Tickets can only be changed or canceled 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.