437 € Cheap Flights from Washington Dulles to London Heathrow

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Flight deals from Washington Dulles to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Washington Dulles Airport to London Heathrow Airport? If you want to travel next month, return fares start from 578 €. Find the lowest prices on one-way and return tickets right here.

London.437 € per passenger.Departing Fri, 2 Oct, returning Thu, 8 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Fri, 2 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Thu, 8 Oct, arriving in Washington Dulles.Price includes taxes and charges.From 437 €, select.

London.470 € per passenger.Departing Sun, 8 Nov, returning Tue, 17 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sun, 8 Nov, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Tue, 17 Nov, arriving in Washington Dulles.Price includes taxes and charges.From 470 €, select.

London.470 € per passenger.Departing Fri, 27 Nov, returning Fri, 4 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Fri, 27 Nov, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Fri, 4 Dec, arriving in Washington Dulles.Price includes taxes and charges.From 470 €, select.

London.470 € per passenger.Departing Sun, 25 Oct, returning Wed, 4 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sun, 25 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 4 Nov, arriving in Washington Dulles.Price includes taxes and charges.From 470 €, select.

London.470 € per passenger.Departing Mon, 7 Dec, returning Tue, 15 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Mon, 7 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Tue, 15 Dec, arriving in Washington Dulles.Price includes taxes and charges.From 470 €, select.

London.476 € per passenger.Departing Fri, 18 Sep, returning Sun, 4 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Fri, 18 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sun, 4 Oct, arriving in Washington Dulles.Price includes taxes and charges.From 476 €, select.

London.479 € per passenger.Departing Thu, 24 Sep, returning Wed, 30 Sep.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Thu, 24 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 30 Sep, arriving in Washington Dulles.Price includes taxes and charges.From 479 €, select.

London.525 € per passenger.Departing Mon, 24 Aug, returning Wed, 2 Sep.Return flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departs from Washington Dulles on Mon, 24 Aug, arriving in London Heathrow.Inbound indirect flight with Scandinavian Airlines, departs from London Heathrow on Wed, 2 Sep, arriving in Washington Dulles.Price includes taxes and charges.From 525 €, select.

London.537 € per passenger.Departing Thu, 1 Oct, returning Wed, 9 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Thu, 1 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 9 Dec, arriving in Washington Dulles.Price includes taxes and charges.From 537 €, select.

London.546 € per passenger.Departing Mon, 21 Sep, returning Thu, 5 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Mon, 21 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Thu, 5 Nov, arriving in Washington Dulles.Price includes taxes and charges.From 546 €, select.

London.567 € per passenger.Departing Sat, 12 Dec, returning Wed, 13 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sat, 12 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 13 Jan, arriving in Washington Dulles.Price includes taxes and charges.From 567 €, select.

London.570 € per passenger.Departing Sun, 17 Jan, returning Mon, 1 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sun, 17 Jan, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 1 Feb, arriving in Washington Dulles.Price includes taxes and charges.From 570 €, select.

London.573 € per passenger.Departing Tue, 25 Aug, returning Fri, 20 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Tue, 25 Aug, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Fri, 20 Nov, arriving in Washington Dulles.Price includes taxes and charges.From 573 €, select.

London.574 € per passenger.Departing Sat, 12 Dec, returning Mon, 5 Apr.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sat, 12 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 5 Apr, arriving in Washington Dulles.Price includes taxes and charges.From 574 €, select.

London.575 € per passenger.Departing Sat, 26 Sep, returning Sat, 19 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sat, 26 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sat, 19 Dec, arriving in Washington Dulles.Price includes taxes and charges.From 575 €, select.

London.578 € per passenger.Departing Fri, 21 Aug, returning Sun, 23 Aug.Return flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departs from Washington Dulles on Fri, 21 Aug, arriving in London Heathrow.Inbound indirect flight with Scandinavian Airlines, departs from London Heathrow on Sun, 23 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 578 €, 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 October.

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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 found	437 €
Cheapest month to fly	October
Average flight time	7 hrs, 25 mins
Most popular airline	Lufthansa
Average flights per week	260

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

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

The best price we found for a return flight from Washington Dulles to London Heathrow is 437 €. 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 Washington Dulles to London Heathrow?

7 hours and 25 minutes is the average flight time from Washington Dulles to London Heathrow.

Which airlines fly direct from Washington Dulles to London Heathrow?

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

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

As of July 2026, there are 260 flights per week flying from Washington Dulles to London Heathrow.

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

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

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

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 Friday, 2 October 2026.

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

Yes – the average flight time is 7 hours and 25 minutes.

How can I find the best flight deal to London Heathrow?

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.

When is the best time to book flights to London?

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.

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

Currently, Icelandair and Finnair offer the cheapest flight tickets to London Heathrow.

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

Hop on a direct flight from Washington Dulles Airport to London Heathrow Airport and you'll be in the air for an average of 7 hours 25 minutes.
London is five hours ahead of Washington DC and observes the UTC+0 timezone.
Flights from IAD to LHR start at 17:40 — the first with British Airways. The last service of the day is at 23:50 with United Airlines. In total, you can take your pick of 39 weekly Washington Dulles Airport to London Heathrow Airport flights.
Your IAD to LHR flight won't wait if you're running late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.
During popular months such as July, 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 of an international flight when you travel during a high season in general.
You can travel nonstop to London, the United Kingdom. Prepare for takeoff with one of these airlines that offer direct flights from Washington Dulles Airport to London Heathrow Airport:
Most passengers choose to fly with British Airways on this route.
Virgin Atlantic stands out as the most punctual carrier for IAD to LHR flights, with 90.91% of its services landing as scheduled.
If you'd like to include a stop along the way, just uncheck 'Direct flights only' when searching for your ticket from Washington Dulles Airport to London Heathrow Airport. Here are the most popular stopovers between IAD and LHR:
- New York Newark Airport
- Boston Logan International Airport
- Dublin Airport

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

The cheapest price we've seen for a one-way Washington Dulles Airport to London Heathrow Airport flight is 231 €. A return plane ticket is currently 437 €. Depending on the availability and when you book, these fares can change.
Get cheap tickets from IAD to LHR by booking at least two months ahead. Based on our research, that's the sweet spot for picking up a bargain.
The cheapest month for flights from Washington Dulles Airport to London Heathrow Airport is July. Use the 'Whole month' tool to find the lowest airfares if you have flexible dates.
Cut down on the time spent looking for cheap flights from IAD to LHR by setting up a Price Alert. We'll send you an email or push notification on the app when fares go down.
Choose your preferred arrival and departure times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Washington Dulles Airport to London Heathrow Airport.

Handy information about Washington Dulles Airport (IAD)

You'll find IAD at 1 Saarinen Circle.
Of the flights that depart from Washington Dulles Airport, 77% land on time at their destination.
To reach Washington Dulles Airport from central Washington DC, it'll take about 45 minutes if you're planning to drive. This depends on traffic, however. It's approximately 40 kilometres from the airport to the city centre.
The journey on public transport will take about 1 hour 10 minutes.
Taking an early flight from Washington Dulles Airport to London Heathrow Airport? Avoid rushing to the airport (and get some extra shut-eye) by picking one of these stays near IAD:

Arriving at London Heathrow Airport (LHR)

The last thing you need is a long trip to your hotel if you're arriving on a late Washington Dulles Airport to London Heathrow Airport flight. Stay at one of these accommodation options near LHR instead:
Begin your adventure by picking up a London Heathrow Airport rental car. Grab a set of wheels from Surprice, U-Save or Green Motion and experience the lesser-explored corners of London and beyond.
Booking your vehicle from London Heathrow Airport around one week ahead can help you get the lowest rate.

When to fly to London Heathrow Airport (LHR)

The quietest month for a flight from Washington Dulles Airport to London Heathrow Airport is March, while July is the most popular. Pick the best time to visit London based on whether you prefer a bustling atmosphere or a more laid-back vibe.
The warmest month in London is July, with the temperature ranging between 11ºC (52ºF) and 26ºC (79ºF). Lock in your flights from Washington Dulles Airport to London Heathrow Airport in this month if you like this kind of weather.
For cooler conditions, look for a cheap ticket from IAD to LHR in January. Temperatures average between 0ºC (32ºF) and 9ºC (48ºF) then.

Explore more of the United Kingdom

You've visited London, now it's time to discover other corners of the United Kingdom. Travel about 257 kilometres north-west to Manchester to check off its leading sights. From Manchester United Museum & Stadium Tour to The Homes of Football and Museum of Science and Industry, you'll have a full itinerary ahead.
If there's time to check out another major stop in the United Kingdom, head for Birmingham, about 161 kilometres north-west of London. Birmingham Museum & Art Gallery, Birmingham Hippodrome Theatre and Bournville Experience are the start of reasons to visit.