Cheap Flights from Washington D.C. to London from US$261

Frequently Asked Questions

• What are the cheapest flights from Washington D.C. to London (WAS-LON)?

  Based on Trip.com data, Frontier Airlines offers one-way fares as low as US$261 on Cheapest nonstop routes (e.g. IAD to LGW on Wed, Jul 15), while Scandinavian Airlines offers Cheapest nonstop round-trips from US$725 departing on Thu, Jun 11 and returning on Sat, Jun 13.

• Which airlines offer direct flights from Washington D.C. to London?

  At the moment, you can catch a nonstop flight from Washington D.C. to London with the following airlines, including: United Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is a flight from Washington D.C. to London?

  It takes about 7 hours 30 minutes to fly from Washington D.C. to London.

• When is the best time to book flights from Washington D.C. 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 Washington D.C. 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 Washington D.C. to London?

  Based on Trip.com data in the past 4 weeks, there is 35 flight per week flying from Washington D.C. to London. You can check the weekly schedule for popular airlines on this route below: United Airlines: S/M/T/W/T/F/S -- UA918 (19:32) United Airlines: S/M/T/W/T/F/S -- UA924 (22:52)

• How can I find the best deals on flights from Washington D.C. to London?

  To find best deals on flights from Washington D.C. 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 Wed, Jul 15, with one-way flights priced at just US$261.
  · 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 July.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from Washington D.C. (WAS) to London (LON) the cheapest?

  The cheapest months to fly from Washington D.C. to London is November, when demand for travel is lower.

• Which upcoming date is cheapest to fly from Washington D.C. to London on?

  After crunching the numbers on our June flight calendar, it's currently cheapest to fly from Washington D.C. to London on June 10, 2026 with Air Canada, with prices starting at US$812.

• Which airports can I fly to for London from Washington D.C.?

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

• Is there any time difference between Washington D.C. and London?

  The time difference between London and Washington D.C. is 5h.

• How do I change or cancel my ticket from Washington D.C. 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.