Cheap Flights from London to Washington D.C. from $381

Frequently Asked Questions

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

  Based on Trip.com data, Icelandair offers one-way fares as low as $381 on Cheapest nonstop routes (e.g. LHR to IAD on Tue, Oct 20), while Icelandair offers Cheapest nonstop round-trips from $408 departing on Thu, Oct 1 and returning on Tue, Oct 6.

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

  At the moment, you can catch a nonstop flight from London to Washington D.C. with the following airlines, including: Virgin Atlantic United Airlines American Airlines Air Canada 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 Washington D.C. (WAS) and what is the distance?

  It takes around 8 hours to fly from London (LON) to Washington D.C. (WAS).

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

  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 Washington D.C. 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 Washington D.C.?

  Based on Trip.com data in the past 4 weeks, there is 33 flight per week flying from London to Washington D.C.. You can check the weekly schedule for popular airlines on this route below: Virgin Atlantic: S/M/T/W/T/F/S -- VS021 (16:20)

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

  To find best deals on flights from London to Washington D.C., 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 Tue, Oct 20, with one-way flights priced at just $381.
  · 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 Washington D.C. travel is around July.
  · Get exclusive promo codes for Trip.com app users.

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

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

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

  After crunching the numbers on our September flight calendar, it's currently cheapest to fly from London to Washington D.C. on September 30, 2026 with Icelandair, with prices starting at $405.

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

  You can arrive at any of the following airports in Washington D.C.: Dulles International Airport (IAD), and Ronald Reagan Washington National Airport (DCA). Flights from Heathrow Airport to Dulles International Airport (LHR-IAD) are by far the most popular option for this route.

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

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

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

  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 Washington D.C.?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from London to Washington D.C. is $909. Fares vary by travel date, airline and availability.

• What is the average cost of a round-trip flight from London to Washington D.C.?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from London to Washington D.C. is $922. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from London to Washington D.C. on Trip.com?

  Enter London and Washington D.C., 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 Washington D.C. route?

  Norse Atlantic Airwaysare the most popular budget airlines flying from London to Washington D.C.. Check baggage, seat and payment fees before comparing the final price.