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Cheap Flights from Washington Dulles to London Heathrow

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Compare Washington Dulles to London Heathrow flight deals

Find the cheapest month or even day of the year to fly to London Heathrow

Book the best London Heathrow fare with no extra fees

Flight deals from Washington Dulles to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Washington Dulles to London Heathrow? Find the lowest prices on one-way and return tickets right here.
London.Rs56,276 per passenger.Departing Mon, 18 Aug.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Mon, 18 Aug, arriving in London Heathrow.Price includes taxes and charges.From Rs56,276, select.
London.Rs56,743 per passenger.Departing Sat, 18 Oct.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sat, 18 Oct, arriving in London Heathrow.Price includes taxes and charges.From Rs56,743, select.
London.Rs60,038 per passenger.Departing Thu, 31 Jul.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Thu, 31 Jul, arriving in London Heathrow.Price includes taxes and charges.From Rs60,038, select.
London.Rs60,969 per passenger.Departing Tue, 30 Sep.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Tue, 30 Sep, arriving in London Heathrow.Price includes taxes and charges.From Rs60,969, select.
London.Rs60,975 per passenger.Departing Mon, 5 May.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Mon, 5 May, arriving in London Heathrow.Price includes taxes and charges.From Rs60,975, select.
London.Rs88,132 per passenger.Departing Wed, 25 Mar.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Wed, 25 Mar, arriving in London Heathrow.Price includes taxes and charges.From Rs88,132, select.
London.Rs88,132 per passenger.Departing Wed, 5 Nov.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Wed, 5 Nov, arriving in London Heathrow.Price includes taxes and charges.From Rs88,132, select.
London.Rs88,319 per passenger.Departing Sun, 11 Jan.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Sun, 11 Jan, arriving in London Heathrow.Price includes taxes and charges.From Rs88,319, select.

Find the cheapest month to fly from Washington Dulles to London Heathrow

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to London Heathrow flights are currently cheapest in August.
May
from Rs60,975
Jun
from Rs103,401
Jul
from Rs60,038
Aug
from Rs56,276
Sep
from Rs60,969
Oct
from Rs56,743
Nov
from Rs88,132
Dec
from Rs99,140
Jan
from Rs88,319
Feb
from Rs88,726
Mar
from Rs88,132
Apr
from Rs88,649

Direct flights from Washington Dulles to London Heathrow

Washington Dulles to London Heathrow: Alternative routes

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

Washington D.C. to London: Flight information

The things to know before you go.
Cheapest flight foundRs56,276
Cheapest month to flyAugust
Average flight time7 hrs, 23 mins
Most popular airlineBritish Airways
Average flights per week207

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

The best price we found for a return flight from Washington Dulles to London Heathrow is Rs129,428. 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.
7 hours and 23 minutes is the average flight time from Washington Dulles to London Heathrow.
American Airlines, British Airways and KLM fly direct from Washington Dulles to London Heathrow.
As of May 2025, there are 209 flights per week flying from Washington Dulles to London Heathrow.
The cheapest month to fly from Washington Dulles to London Heathrow is usually May 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to London Heathrow Airport on Wednesday, 3 September 2025.
Yes – the average flight time is 7 hours and 23 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 London Heathrow 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 London is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Scandinavian Airlines and Finnair offer the cheapest flight tickets to London Heathrow.

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

  • The average time for a direct flight from Washington Dulles International Airport to London Heathrow Airport is 7 hours 15 minutes.

  • London is four hours ahead of Washington DC and observes the UTC+0 timezone.

  • Each week, there are 56 Washington Dulles International Airport to London Heathrow Airport flights. If you want to get going as soon as possible, select the 08:30 United Airlines flight. If you'd rather make the most of your time before you fly, the latest flight is at 23:35 with United Airlines.

  • To ensure you get on your IAD to LHR flight, allow plenty of time for things like check-in and baggage drop. Arriving two hours before international departures and an hour before domestic flights is the standard rule.

  • During popular months like April, it's a good idea to get to the airport earlier than normal. Plan to arrive two hours before domestic departures and four hours ahead for an international flight when you travel during a peak period in general.

  • With direct flights from Washington Dulles International Airport to London Heathrow Airport operated by a number of airlines, getting to London (and then other parts of United Kingdom) is a cinch. You can travel nonstop with:

  • Most travellers choose to fly with British Airways on this route.

  • With a reliable 88.33% of services arriving on schedule, Virgin Atlantic is the most punctual carrier offering IAD to LHR flights.

  • We make it simple to book a flight with a stopover. To see all your options for tickets from Washington Dulles International Airport to London Heathrow Airport, deselect 'Direct flights only.' Then, choose a flight that has a stop long enough to explore the city of your choice. Stopovers between IAD and LHR include:

    • Newark Liberty International Airport

    • Dublin Airport

    • Logan International Airport

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

  • Rs56,276 is the lowest price for a one-way Washington Dulles International Airport to London Heathrow Airport flight. A return flight starts from Rs129,428. These fares may change depending on demand and availability.

  • To secure cheap tickets from IAD to LHR, reserve your trip eight months ahead of your departure date.

  • The cheapest month for flights from Washington Dulles International Airport to London Heathrow Airport is July. Use the 'Whole month' tool to find the lowest airfares if you have a flexible travel schedule.

  • You won't have to check every day to see if fares have dropped when you create a Price Alert. We'll update you as soon as a special offer becomes available on cheap flights from IAD to LHR.

  • Tailor your trip using filters. Select your preferred departure and arrival times, airlines and total journey duration. You can also sort the results by 'Best,' 'Cheapest' or 'Fastest' flights from Washington Dulles International Airport to London Heathrow Airport.

Handy information about Washington Dulles International Airport (IAD)

  • IAD's address is 1 Saarinen Circle.

  • Of all flights leaving Washington Dulles International Airport, 74.39% arrive as scheduled at their destination.

  • Central Washington DC to Washington Dulles International Airport is around 56 kilometres. Depending on traffic, it'll take you about 50 minutes to get there if you're driving, catching a cab or ride-sharing.

  • Expect a journey time of about 3 hours 25 minutes on public transport.

  • Have an early flight from Washington Dulles International Airport to London Heathrow Airport? Avoid rushing to the airport (and sneak in some extra precious sleep) by picking one of these stays close to IAD:

Arriving at London Heathrow Airport (LHR)

Getting from London Heathrow Airport (LHR) to central London

  • From London Heathrow Airport, London is approximately 31 kilometres away. It takes around 55 minutes to drive to the centre.

  • If you're using public transport, expect a journey time of roughly 1 hour.

When to fly to London Heathrow Airport (LHR)

  • July is the most popular month for flights from Washington Dulles International Airport to London Heathrow Airport. To steer clear of the crowds, visit London in February.

  • Book your flight from Washington Dulles International Airport to London Heathrow Airport for July if you want to go to London during its warmest month. You can expect temperatures of between 11ºC and 26ºC.

  • January has average temperatures of between 0ºC and 9ºC. Search for cheap tickets from IAD to LHR around that time if you like travelling in cooler conditions.

Explore more of United Kingdom

  • Birmingham is just one of the many cities in United Kingdom waiting to be discovered once you've seen the sights of London. Around 161 kilometres away to the north-west, popular attractions include Cadbury World, The Library of Birmingham and National Sea Life Centre.

  • If there's time to check out another well-known destination in United Kingdom, head for Bristol, roughly 177 kilometres west of London. Clifton Suspension Bridge, Cabot Tower and Brandon Hill Nature Park are key reasons to visit.

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

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