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Cheap flights from London Heathrow to Washington Dulles

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Compare London Heathrow to Washington Dulles flight deals

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

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Flight deals from London Heathrow to Washington Dulles

Looking for a cheap last-minute deal or the best round-trip flight from London Heathrow to Washington Dulles? Find the lowest prices on one-way and round-trip tickets right here.
Washington, D.C..C$823 per passenger.Departing Sat, May 10, returning Fri, May 23.Round-trip flight with Brussels Airlines.Outbound indirect flight with Brussels Airlines, departing from London Heathrow on Sat, May 10, arriving in Washington Dulles.Inbound indirect flight with Brussels Airlines, departing from Washington Dulles on Fri, May 23, arriving in London Heathrow.Price includes taxes and charges.From C$823, select.
Washington, D.C..C$835 per passenger.Departing Mon, Oct 13, returning Mon, Oct 20.Round-trip flight with British Airways and Scandinavian Airlines.Outbound indirect flight with British Airways, departing from London Heathrow on Mon, Oct 13, arriving in Washington Dulles.Inbound indirect flight with Scandinavian Airlines, departing from Washington Dulles on Mon, Oct 20, arriving in London Heathrow.Price includes taxes and charges.From C$835, select.
Washington, D.C..C$837 per passenger.Departing Tue, Apr 29, returning Mon, May 12.Round-trip flight with Austrian Airlines.Outbound indirect flight with Austrian Airlines, departing from London Heathrow on Tue, Apr 29, arriving in Washington Dulles.Inbound indirect flight with Austrian Airlines, departing from Washington Dulles on Mon, May 12, arriving in London Heathrow.Price includes taxes and charges.From C$837, select.
Washington, D.C..C$839 per passenger.Departing Wed, Oct 29, returning Mon, Nov 10.Round-trip flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departing from London Heathrow on Wed, Oct 29, arriving in Washington Dulles.Inbound indirect flight with Scandinavian Airlines, departing from Washington Dulles on Mon, Nov 10, arriving in London Heathrow.Price includes taxes and charges.From C$839, select.
Washington, D.C..C$840 per passenger.Departing Fri, Sep 5, returning Tue, Sep 9.Round-trip flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departing from London Heathrow on Fri, Sep 5, arriving in Washington Dulles.Inbound indirect flight with Scandinavian Airlines, departing from Washington Dulles on Tue, Sep 9, arriving in London Heathrow.Price includes taxes and charges.From C$840, select.
Washington, D.C..C$840 per passenger.Departing Thu, Mar 5, returning Mon, Mar 9.Round-trip flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departing from London Heathrow on Thu, Mar 5, arriving in Washington Dulles.Inbound indirect flight with Scandinavian Airlines, departing from Washington Dulles on Mon, Mar 9, arriving in London Heathrow.Price includes taxes and charges.From C$840, select.
Washington, D.C..C$840 per passenger.Departing Tue, Dec 2, returning Sun, Dec 7.Round-trip flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departing from London Heathrow on Tue, Dec 2, arriving in Washington Dulles.Inbound indirect flight with Scandinavian Airlines, departing from Washington Dulles on Sun, Dec 7, arriving in London Heathrow.Price includes taxes and charges.From C$840, select.
Washington, D.C..C$840 per passenger.Departing Mon, Nov 3, returning Tue, Nov 11.Round-trip flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departing from London Heathrow on Mon, Nov 3, arriving in Washington Dulles.Inbound indirect flight with Scandinavian Airlines, departing from Washington Dulles on Tue, Nov 11, arriving in London Heathrow.Price includes taxes and charges.From C$840, select.

When is the cheapest time to fly from London Heathrow to Washington Dulles?

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to Washington Dulles flights are currently cheapest in May.
Apr
from C$1,054
May
from C$823
Jun
from C$929
Jul
from C$1,007
Aug
from C$844
Sep
from C$840
Oct
from C$835
Nov
from C$840
Dec
from C$840
Jan
from C$843
Feb
from C$843
Mar
from C$840

Direct flights from London Heathrow to Washington Dulles

London Heathrow to Washington Dulles: Alternative routes

Compare routes from London Heathrow 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 foundC$823
Cheapest month to flyMay
Average flight time8 hrs, 19 mins
Most popular airlineAmerican Airlines
Average flights per week226

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

The best price we found for a round-trip flight from London Heathrow to Washington Dulles is C$823. 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 Heathrow to Washington Dulles.
American Airlines, British Airways and Aer Lingus fly direct from London Heathrow to Washington Dulles.
There are 226 flights per week flying from London Heathrow to Washington Dulles, as of April 2025.
The cheapest month to fly from London Heathrow to Washington Dulles is usually April 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Washington Dulles Airport on Saturday, May 10, 2025.
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.
Currently, Brussels Airlines and Delta offer the cheapest flight tickets to Washington Dulles.

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

  • Jump on a direct flight from London Heathrow Airport to Washington Dulles International Airport and you'll be in the air for an average of 8 hours 20 minutes.

  • Washington DC's timezone is UTC-4, making Washington DC four hours behind London.

  • Flights from LHR to IAD start at 07:10 — the first with United Airlines. The latest departure is at 17:35 with British Airways. Overall, you can choose from 56 weekly London Heathrow Airport to Washington Dulles International Airport flights.

  • For a stress-free journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This way, you can comfortably catch your LHR to IAD flight.

  • During popular months such as July, you'll want to get to the airport well in advance. Arrive two hours before domestic departures and four hours ahead for an international flight when you travel during a high season in general.

  • A range of airlines offer direct flights from London Heathrow Airport to Washington Dulles International Airport, so jetting to Washington DC (and then seeing more parts of United States!) is easy. Top carriers that fly nonstop include:

  • The airline with the highest number of bookings on this route is British Airways.

  • With a dependable 91.74% of services arriving on schedule, United Airlines is the most punctual carrier offering LHR to IAD flights.

  • Consider adding a stopover when booking your ticket from London Heathrow Airport to Washington Dulles International Airport. Simply uncheck 'Direct flights only' to break up your journey, or visit a new city along the way. Check out these options between LHR and IAD:

    • John F. Kennedy International Airport

    • Amsterdam Airport Schiphol

    • Dublin Airport

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

  • At the moment, C$536 is the cheapest price we've seen for a one-way London Heathrow Airport to Washington Dulles International Airport flight. The best price for a return ticket is C$823. Remember that fares could change due to availability at the time of booking.

  • Score cheap tickets from LHR to IAD by booking six months ahead. According to our research, that's the sweet spot for landing a bargain.

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

  • You don't need to check every day to find out if fares have gone down when you set up a Price Alert. We'll update you as soon as there's a better deal on cheap flights from LHR to IAD.

  • Select your ideal arrival and departure times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to see the best deals on flights from London Heathrow Airport to Washington Dulles International Airport.

Handy information about London Heathrow Airport (LHR)

  • When it comes to the on-time performance of London Heathrow Airport, 68.18% of flights arrive within the scheduled timeframe.

  • To get to London Heathrow Airport from central London, it'll take around 55 minutes by car. This depends on traffic though. It's approximately 31 kilometres from the airport to the city centre.

  • The journey when using public transport takes roughly 1 hour.

  • Get your vacation off to a hassle-free start by staying near LHR. Whether you've booked an early flight from London Heathrow Airport to Washington Dulles International Airport or just don't like being rushed, these stays are perfect:

Arriving at Washington Dulles International Airport (IAD)

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

  • IAD is located at 1 Saarinen Circle.

  • Washington Dulles International Airport to the centre of Washington DC has a drive time of around 50 minutes. It's approximately 56 kilometres away.

  • Travelling by public transport will take you roughly 3 hours 25 minutes.

When to fly to Washington Dulles International Airport (IAD)

  • It's time to work out your dates for your flight from London Heathrow Airport to Washington Dulles International Airport. April is the most popular month to head to Washington DC. If you're after a more relaxed vibe, go in January.

  • The warmest month in Washington DC is July, with temperatures ranging between 19ºC (66ºF) and 33ºC (91ºF). Lock in your flights from London Heathrow Airport to Washington Dulles International Airport in this month if you enjoy this type of weather.

  • January has average temperatures of between -6ºC (21ºF) and 10ºC (50ºF). Look for cheap tickets from LHR to IAD sometime then if you like cooler conditions.

Explore more of United States

  • New York is just one of the many cities in United States waiting to be explored once you've seen the sights of Washington DC. Around 322 kilometres away to the north-east, its best attractions include Statue of Liberty, Central Park and Empire State Building.

  • If you're eager to discover another great destination in United States, consider Philadelphia, roughly 193 kilometres north-east of Washington DC. Liberty Bell, Independence Hall and Philadelphia Museum of Art are key reasons to visit.

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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.