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Cheap Flights from London (LOND) to Washington D.C. (IAD)

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Compare London to Washington Dulles flight deals

Find the cheapest month or even day of the year to fly to Washington Dulles

Book the best Washington Dulles fare with no extra fees

Flight deals from London to Washington Dulles

Looking for a cheap last-minute deal or the best return flight from London to Washington Dulles? Find the lowest prices on one-way and return tickets right here.
Washington D.C..$825 per passenger.Departing Sat, 21 Mar, returning Sat, 21 Mar.Return flight with Lufthansa and United.Outbound indirect flight with Lufthansa, departs from London Heathrow on Sat, 21 Mar, arriving in Washington Dulles.Inbound indirect flight with United, departs from Washington Dulles on Sat, 21 Mar, arriving in London Heathrow.Price includes taxes and charges.From $825, select.
Washington D.C..$863 per passenger.Departing Sat, 1 Nov, returning Sat, 1 Nov.Return flight with United.Outbound indirect flight with United, departs from London Heathrow on Sat, 1 Nov, arriving in Washington Dulles.Inbound indirect flight with United, departs from Washington Dulles on Sat, 1 Nov, arriving in London Heathrow.Price includes taxes and charges.From $863, select.
Washington D.C..$871 per passenger.Departing Tue, 17 Jun, returning Mon, 21 Jul.Return flight with Norse Atlantic Airways (UK) and Icelandair.Outbound indirect flight with Norse Atlantic Airways (UK), departs from London Gatwick on Tue, 17 Jun, arriving in Washington Dulles.Inbound indirect flight with Icelandair, departs from Washington Dulles on Mon, 21 Jul, arriving in London Heathrow.Price includes taxes and charges.From $871, select.
Washington D.C..$887 per passenger.Departing Thu, 5 Feb, returning Sat, 28 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Gatwick on Thu, 5 Feb, arriving in Washington Dulles.Inbound indirect flight with Icelandair, departs from Washington Dulles on Sat, 28 Feb, arriving in London Gatwick.Price includes taxes and charges.From $887, select.
Washington D.C..$888 per passenger.Departing Wed, 1 Oct, returning Sat, 11 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Gatwick on Wed, 1 Oct, arriving in Washington Dulles.Inbound indirect flight with Icelandair, departs from Washington Dulles on Sat, 11 Oct, arriving in London Gatwick.Price includes taxes and charges.From $888, select.
Washington D.C..$894 per passenger.Departing Fri, 5 Dec, returning Sun, 7 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Gatwick on Fri, 5 Dec, arriving in Washington Dulles.Inbound indirect flight with Icelandair, departs from Washington Dulles on Sun, 7 Dec, arriving in London Gatwick.Price includes taxes and charges.From $894, select.
Washington D.C..$894 per passenger.Departing Thu, 27 Nov, returning Mon, 1 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Gatwick on Thu, 27 Nov, arriving in Washington Dulles.Inbound indirect flight with Icelandair, departs from Washington Dulles on Mon, 1 Dec, arriving in London Gatwick.Price includes taxes and charges.From $894, select.
Washington D.C..$894 per passenger.Departing Tue, 6 Jan, returning Tue, 13 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Gatwick on Tue, 6 Jan, arriving in Washington Dulles.Inbound indirect flight with Icelandair, departs from Washington Dulles on Tue, 13 Jan, arriving in London Gatwick.Price includes taxes and charges.From $894, select.

The cheapest month to fly from London to Washington Dulles Airport

We’re always keeping an eye on fares, to help you find the lowest one in seconds. Check out the London to Washington Dulles Airport flight prices forecast over the next 12 months.
May
from $1,674
Jun
from $947
Jul
from $950
Aug
from $982
Sep
from $899
Oct
from $888
Nov
from $863
Dec
from $894
Jan
from $894
Feb
from $887
Mar
from $825
Apr
from $1,007
Cheapest month:March
Most expensive month:May

Direct flights from London to Washington Dulles

London to Washington Dulles: Alternative routes

Compare routes from London to Washington D.C. below. You may find an airport to fly into that's cheaper, faster, or easier than Washington Dulles.

London to Washington D.C.: Flight information

The things to know before you go.
Cheapest flight found$825
Cheapest month to flyMarch
Average flight time8 hrs, 19 mins
Most popular airlineAmerican Airlines
Average flights per week762

Finding cheap flights from London to Washington Dulles: Frequently asked questions

The best price we found for a return flight from London to Washington Dulles is $825. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
8 hours and 19 minutes is the average flight time from London to Washington Dulles.
American Airlines, British Airways and Aer Lingus fly direct from London to Washington Dulles.
As of May 2025, there are 762 flights per week flying from London to Washington Dulles.
The cheapest month to fly from London to Washington Dulles is usually May 2025.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from London to Washington Dulles Airport on Saturday, 21 March 2026.
Yes – the average flight time is 8 hours and 19 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Washington Dulles but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.

Flying from London to Washington Dulles International Airport (IAD): what you need to know

  • You can select from a range of airports when organising a flight from London to Washington Dulles International Airport (IAD). Explore your options for flying out of London Heathrow Airport (LHR), London Gatwick Airport (LGW) or Stansted Airport (STN). London Luton Airport (LTN) and London City Airport (LCY) also service London.

  • Approximately 8 hours 20 minutes is how long you can expect to be in the air on a direct flight from London to Washington Dulles International Airport.

  • The timezone in Washington DC is UTC-4, which is 4 hours behind London. Washington Dulles International Airport is located in Washington DC.

  • The busiest route is from London Heathrow Airport (LHR) to Washington Dulles International Airport (IAD), with 56 direct weekly services. If you'd like to head off as soon as possible, the earliest flight from LHR to IAD is the 07:10 United service. If you prefer to leave later in the day, the last departure is at 17:35 with British Airways.

  • Your flight from London to IAD won't wait if you're running late, so get to the airport with time to spare. Arrive up to one hour in advance for domestic flights and two hours ahead when you're travelling internationally.

  • You'll want to head there even earlier during popular months like July. Aim for two hours before domestic departures and four hours ahead of international flights. Once you've checked in, you can use any extra time to relax or grab something to eat.

Airports in London

London Heathrow Airport (LHR)

  • London Heathrow Airport (LHR) offers an easy route to your destination. Nonstop flights from London to Washington Dulles International Airport (IAD) can be booked from this terminal.

  • At LHR, you'll find a good selection of carriers that offer direct flights from London to Washington Dulles International Airport, including:

  • Think about adding a stopover to potentially save on your flight from London to IAD. Just deselect 'Direct flights only' when browsing departures from London Heathrow Airport (LHR). Break up your trip (and maybe save some cash) by stopping at one of these popular airports:

    • Dublin Airport (DUB)

    • John F. Kennedy International Airport (JFK)

    • Amsterdam Airport Schiphol Airport (AMS)

  • The distance from central London to LHR is roughly 31 kilometres. Check out Google Maps for the quickest way to get there, whether you're driving or taking public transport.

  • After a hassle-free start to your break? Stay near London Heathrow Airport. Whether you have an early flight from London to Washington Dulles International Airport or want to avoid feeling rushed, these hotels are ideal:

London Gatwick Airport (LGW)

  • Looking for more options for a direct flight from London to Washington Dulles International Airport (IAD)? Check out the fares flying out of London Gatwick Airport (LGW).

  • When jetting off from LGW, you can pick from a range of airlines that offer direct flights from London to IAD. Cruise through the sky with these preferred carriers:

  • Split up your flight from London to Washington Dulles International Airport with a stop so you can freshen up or tick another place off your list. Some great stopovers between London Gatwick Airport and IAD include:

    • Newark Liberty International Airport (EWR)

    • Dublin Airport (DUB)

    • Logan International Airport (BOS)

  • LGW is about 80 kilometres from central London. It'll take you 1 hour and 19 minutes or so to get to the airport driving from the city centre. Public transport takes approximately 1 hour and 26 minutes.

  • Want to enjoy an extra night away before catching your flight from London to IAD? Check in to a hotel near London Gatwick Airport before your adventure officially starts. These stays are calling your name:

About Washington Dulles International Airport (IAD)

Getting from Washington Dulles International Airport (IAD) to central Washington DC

  • Washington Dulles International Airport is approximately 56 kilometres from central Washington DC. With your own car rental or in a cab, the drive is around 51 minutes.

  • It typically takes 3 hours and 26 minutes to get there using public transport.

How to find the cheapest flights from London to Washington Dulles International Airport (IAD)

  • The best price we've seen for a one-way ticket from London to Washington Dulles International Airport is $508. The cheapest price for a return flight is $825. Remember fares can change due to availability at the time of booking.

  • 8 months is how far we recommend booking ahead to find flight tickets from London to IAD.

  • The cheapest month for tickets from London to Washington Dulles International Airport is May. Use the 'Whole month' search feature to find the most affordable day to fly if you're flexible with your departure dates.

  • Set up a Price Alert for flight tickets from London to IAD. There's no need to check back in every day to find out if prices have dropped. We'll notify you the moment the price changes.

  • Make the most of the filters to find your ideal journey. To see the 'Cheapest,' 'Best' or 'Fastest' flights from London to Washington Dulles International Airport, use the 'Sort by' tool. You can also filter by departure and arrival times, airline, and number of stops.

The best time to fly from London to Washington Dulles International Airport (IAD)

  • July is the most popular month for flights from London to Washington Dulles International Airport. To skip the crowds, plan your trip to Washington DC in February when things are quieter.

  • Schedule your flight from London to IAD for July if you're eager to head to the city during its warmest month. You can expect temperatures in Washington DC to range from 19ºC to 33ºC.

  • For cooler conditions, look for a cheap flight from London to Washington Dulles International Airport in January when temperatures average between -6ºC and 10ºC.

More about Washington DC

  • Start your Washington DC trip right by choosing the ideal place to stay. As soon as you've booked your flight from London to Washington Dulles International Airport, browse our selection of accommodation options including:

  • There are so many things to explore in this city it can be hard to know where to begin. White House Historical Association, The White House and National Mall are leading attractions which should be on every Washington DC itinerary.

Complete your Washington DC trip with a car rental

  • Grab the keys to one of our car rentals in Washington DC and explore at your own pace. Easily compare prices from trusted providers in one go after booking your hotel and cheap flights from London to Washington Dulles International Airport.

Plan the rest of your trip from London to Washington D.C.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.