Cheap Flights from London Heathrow to Washington Dulles

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 return flight from London Heathrow Airport to Washington Dulles Airport? If you want to travel next month, return fares start from R 10,594. Find the lowest prices on one-way and return tickets right here.

Washington D.C..R 6,403 per passenger.Departing Tue, 25 Aug.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Tue, 25 Aug, arriving in Washington Dulles.Price includes taxes and charges.From R 6,403, select.

Washington D.C..R 7,151 per passenger.Departing Tue, 8 Sep.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Tue, 8 Sep, arriving in Washington Dulles.Price includes taxes and charges.From R 7,151, select.

Washington D.C..R 7,155 per passenger.Departing Tue, 6 Oct.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Tue, 6 Oct, arriving in Washington Dulles.Price includes taxes and charges.From R 7,155, select.

Washington D.C..R 7,262 per passenger.Departing Wed, 18 Nov.One-way flight with Finnair.Outbound direct flight with Finnair departs from London Heathrow on Wed, 18 Nov, arriving in Washington Dulles.Price includes taxes and charges.From R 7,262, select.

Washington D.C..R 7,281 per passenger.Departing Tue, 8 Sep.One-way flight with Finnair.Outbound direct flight with Finnair departs from London Heathrow on Tue, 8 Sep, arriving in Washington Dulles.Price includes taxes and charges.From R 7,281, select.

Washington D.C..R 7,291 per passenger.Departing Thu, 28 Jan.One-way flight with Finnair.Outbound direct flight with Finnair departs from London Heathrow on Thu, 28 Jan, arriving in Washington Dulles.Price includes taxes and charges.From R 7,291, select.

Washington D.C..R 7,431 per passenger.Departing Thu, 24 Dec.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Thu, 24 Dec, arriving in Washington Dulles.Price includes taxes and charges.From R 7,431, select.

Washington D.C..R 7,489 per passenger.Departing Tue, 23 Feb.One-way flight with Iberia.Outbound indirect flight with Iberia, departs from London Heathrow on Tue, 23 Feb, arriving in Washington Dulles.Price includes taxes and charges.From R 7,489, select.

Washington D.C..R 7,525 per passenger.Departing Tue, 2 Mar.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Tue, 2 Mar, arriving in Washington Dulles.Price includes taxes and charges.From R 7,525, select.

Washington D.C..R 7,528 per passenger.Departing Sun, 14 Mar.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Sun, 14 Mar, arriving in Washington Dulles.Price includes taxes and charges.From R 7,528, select.

Washington D.C..R 7,528 per passenger.Departing Wed, 19 May.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Wed, 19 May, arriving in Washington Dulles.Price includes taxes and charges.From R 7,528, select.

Washington D.C..R 7,532 per passenger.Departing Sun, 4 Oct.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Sun, 4 Oct, arriving in Washington Dulles.Price includes taxes and charges.From R 7,532, select.

Washington D.C..R 7,532 per passenger.Departing Tue, 9 Feb.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Tue, 9 Feb, arriving in Washington Dulles.Price includes taxes and charges.From R 7,532, select.

Washington D.C..R 7,545 per passenger.Departing Wed, 9 Dec.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Wed, 9 Dec, arriving in Washington Dulles.Price includes taxes and charges.From R 7,545, select.

Washington D.C..R 7,552 per passenger.Departing Sun, 11 Apr.One-way flight with Iberia.Outbound indirect flight with Iberia, departs from London Heathrow on Sun, 11 Apr, arriving in Washington Dulles.Price includes taxes and charges.From R 7,552, select.

Washington D.C..R 7,594 per passenger.Departing Thu, 27 Aug.One-way flight with British Airways.Outbound direct flight with British Airways departs from London Heathrow on Thu, 27 Aug, arriving in Washington Dulles.Price includes taxes and charges.From R 7,594, select.

Find the cheapest month 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 August.

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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 found	R 6,403
Cheapest month to fly	August
Average flight time	8 hrs, 29 mins
Most popular airline	Lufthansa
Average flights per week	220

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

How much are return flights from London Heathrow to Washington Dulles?

The best price we found for a return flight from London Heathrow to Washington Dulles is R 8,767. 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.

How long does it take to fly from London Heathrow to Washington Dulles?

8 hours and 29 minutes is the average flight time from London Heathrow to Washington Dulles.

Which airlines fly direct from London Heathrow to Washington Dulles?

Lufthansa, American Airlines and British Airways fly direct from London Heathrow to Washington Dulles.

How many flights are there a week from London Heathrow to Washington Dulles?

As of July 2026, there are 220 flights per week flying from London Heathrow to Washington Dulles.

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

The cheapest month to fly from London Heathrow to Washington Dulles is usually October.

Which upcoming date is cheapest to fly from London Heathrow Airport to Washington Dulles Airport on?

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 Tuesday, 20 October 2026.

Can I get a direct flight from London Heathrow Airport to Washington Dulles Airport?

Yes – the average flight time is 8 hours and 29 minutes.

How can I find the best flight deal to Washington Dulles?

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.

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

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.

Which is the cheapest airline to fly from London Heathrow Airport to Washington Dulles with?

Currently, Icelandair and Austrian Airlines offer the cheapest flight tickets to Washington Dulles.

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

The average time for a direct flight from London Heathrow Airport to Washington Dulles Airport is 8 hours 20 minutes.
The timezone in Washington DC is UTC-5, which is five hours behind London.
Flights from LHR to IAD start at 10:25 — the first with United Airlines. The last service of the day is at 17:05 with British Airways. Overall, you can take your pick of 39 weekly London Heathrow Airport to Washington Dulles Airport flights.
Get to the airport on time so you don't miss your LHR to IAD flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid any last-minute rush.
During popular months like July, it's best to get to the airport even earlier. Plan to arrive two hours before a domestic departure and four hours ahead for an international flight whenever you're flying during a peak period in general.
You can travel nonstop to Washington DC, the United States. Jet off with one of these carriers that operate direct flights from London Heathrow Airport to Washington Dulles Airport:
Most travellers choose to fly with British Airways on this route.
Virgin Atlantic is the most punctual carrier operating LHR to IAD flights. An impressive 86.67% of its services on this route land as scheduled.
If you want to break up your flight, just deselect 'Direct flights only' when searching for your ticket from London Heathrow Airport to Washington Dulles Airport. These are the top stopovers between LHR and IAD:
- Amsterdam Schiphol Airport
- New York John F. Kennedy Airport
- Dublin Airport

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

R 6,403 is currently the best price for a one-way London Heathrow Airport to Washington Dulles Airport flight. A return flight starts at R 8,767. These fares can change depending on availability.
Don't wait until the last minute. You're more likely to find cheap tickets from LHR to IAD if you book ahead. Airlines often offer some excellent early bird discounts.
May is the cheapest month for flights from London Heathrow Airport to Washington Dulles Airport. If you're looking to fly at a different time of year, the 'Whole month' tool will show you the lowest airfares for each month.
Spend less time searching for cheap flights from LHR to IAD by setting up a Price Alert. You'll get an email or notification through the app when fares go down.
Secure the right flight for you with the help of the filters. To see the 'Cheapest,' 'Best' or 'Fastest' flights from London Heathrow Airport to Washington Dulles Airport, use the 'Sort by' function. You can also filter results by departure and arrival times, airline, and journey duration.

Handy information about London Heathrow Airport (LHR)

Of all flights departing from London Heathrow Airport, 78% arrive on time at their destination.
To get to London Heathrow Airport from central London, it'll take about 45 minutes if you're planning to drive. This depends on traffic, however. It's approximately 24 kilometres from the airport to the city centre.
You can expect a journey time of roughly 25 minutes on public transport.
Have an early flight from London Heathrow Airport to Washington Dulles Airport? Avoid the hassle of rushing to the airport (and catch some extra z's) by picking one of these stays close to LHR:

Arriving at Washington Dulles Airport (IAD)

The last thing you need is a long trip to your hotel if you're arriving on a late London Heathrow Airport to Washington Dulles Airport flight. Book one of these accommodation options near IAD instead:
Go wherever you want, whenever you want with a Washington Dulles Airport rental car. Pick up your wheels from Dollar, Thrifty or Sixt and venture far and wide through Washington DC and beyond.
For the lowest price, reserve your vehicle from Washington Dulles Airport around one week ahead.

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

You'll find IAD at 1 Saarinen Circle.
Washington Dulles Airport is roughly 40 kilometres from the centre of Washington DC. The drive time takes about 45 minutes.
If you're using public transport, expect a journey of roughly 1 hour 10 minutes.

When to fly to Washington Dulles Airport (IAD)

July is the busiest month for flights from London Heathrow Airport to Washington Dulles Airport. For a quieter experience, go to Washington DC in February.
Book your flight from London Heathrow Airport to Washington Dulles Airport for July if you want to visit Washington DC during its warmest month. You can expect temperatures of between 19ºC (66ºF) and 33ºC (91ºF).
If you want cooler conditions, look for a cheap ticket from LHR to IAD in January. Temperatures average between -6ºC (21ºF) and 10ºC (50ºF) then.

Explore more of the United States

New York is just one of the many cities in the United States waiting to be explored after you've seen Washington DC. Around 322 kilometres away to the north-east, its top attractions include Central Park, Statue of Liberty and Metropolitan Museum of Art.
Philadelphia is another must-experience destination in the United States and is around 193 kilometres north-east of Washington DC. No journey is complete without visiting Independence Hall, Liberty Bell and Philadelphia Museum of Art.