Cheap Flights from London to San Francisco from $455

Frequently Asked Questions

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

  Based on Trip.com data, Aer Lingus offers one-way fares as low as $455 on Cheapest nonstop routes (e.g. LHR to SFO on Mon, Oct 26), while United Airlines offers Cheapest nonstop round-trips from $490 departing on Thu, Oct 8 and returning on Thu, Oct 15.

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

  At the moment, you can catch a nonstop flight from London to San Francisco with the following airlines, including: British Airways United Airlines Virgin Atlantic Lufthansa American Airlines 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 London (LON) to San Francisco (SFO) and what is the distance?

  It takes around 11 hours 6 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 42 flight per week flying from London to San Francisco. You can check the weekly schedule for popular airlines on this route below: Lufthansa: S/M/T/W/T/F/S -- LH9374 (11:01)

• 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, Oct 26, with one-way flights priced at just $455.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is British Airways.
  · 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 are flight tickets from London (LON) to San Francisco (SFO) the cheapest?

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

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

  After crunching the numbers on our September flight calendar, it's currently cheapest to fly from London to San Francisco on September 16, 2026 with Aer Lingus, with prices starting at $444.

• Which airports can I fly into San Francisco from London?

  You can arrive at any of the following airports in San Francisco: San Francisco International Airport (SFO). Flights from Heathrow Airport to San Francisco International Airport (LHR-SFO) are by far the most popular option for this route.

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

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

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

  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.

• What is the average cost of a one-way flight from London to San Francisco?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from London to San Francisco is $1,033. Fares vary by travel date, airline and availability.

• What is the average cost of a round-trip flight from London to San Francisco?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from London to San Francisco is $939. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from London to San Francisco on Trip.com?

  Enter London and San Francisco, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.

• Are there budget airlines on the London to San Francisco route?

  Condorare the most popular budget airlines flying from London to San Francisco. Check baggage, seat and payment fees before comparing the final price.