Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from London Heathrow Airport to Washington, D.C. from €349

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Washington, D.C. departing on 17/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags
Voted the Winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from London Heathrow Airport to Washington, D.C.

Cheap return flights

Austrian Airlines Logo
16:40 - 19:55LHR-IAD
8h 15mdirect
Austrian Airlines Logo
18:40 - 06:55IAD-LHR
7h 15mdirect
€349Austrian Airlines
Find Deal
Wed, 17 Sep - Tue, 23 Sep
United Airlines Logo
14:05 - 07:30LHR-IAD
22h 25m2 stops
United Airlines Logo
18:40 - 06:55IAD-LHR
7h 15mdirect
€402United Airlines
Find Deal
Sat, 20 Sep - Sun, 21 Sep
TAP AIR PORTUGAL Logo
06:00 - 15:15LHR-IAD
14h 15m1 stop
TAP AIR PORTUGAL Logo
22:30 - 21:35IAD-LHR
18h 05m1 stop
€428TAP AIR PORTUGAL
Find Deal
Thu, 27 Nov - Sun, 7 Dec
TAP AIR PORTUGAL Logo
06:00 - 15:15LHR-IAD
14h 15m1 stop
TAP AIR PORTUGAL Logo
22:30 - 22:40IAD-LHR
19h 10m1 stop
€430TAP AIR PORTUGAL
Find Deal
Thu, 27 Nov - Sun, 7 Dec
Icelandair Logo
21:25 - 19:25LHR-BWI
27h 00m1 stop
Icelandair Logo
20:30 - 11:55BWI-LHR
10h 25m1 stop
€477Icelandair
Find Deal
Tue, 26 Aug - Tue, 2 Sep
Logo
07:40 - 17:40LHR-BWI
15h 00m2 stops
Logo
18:50 - 13:55BWI-LHR
14h 05m2 stops
€487
Find Deal
Tue, 26 Aug - Tue, 2 Sep
Icelandair Logo
13:05 - 19:20LHR-IAD
11h 15m1 stop
Icelandair Logo
20:30 - 11:55IAD-LHR
10h 25m1 stop
€499Icelandair
Find Deal
Tue, 9 Sep - Fri, 19 Sep
Logo
08:55 - 16:30LHR-IAD
12h 35m1 stop
Logo
18:20 - 06:40IAD-LHR
7h 20mdirect
€503
Find Deal
Sat, 22 Nov - Sat, 13 Dec
Lufthansa Logo
11:10 - 20:05LHR-IAD
13h 55m1 stop
Lufthansa Logo
18:20 - 06:40IAD-LHR
7h 20mdirect
€506Lufthansa
Find Deal
Thu, 6 Nov - Mon, 10 Nov
Lufthansa Logo
09:30 - 15:50LHR-IAD
11h 20m1 stop
Lufthansa Logo
18:40 - 06:55IAD-LHR
7h 15mdirect
€507Lufthansa
Find Deal
Sun, 24 Aug - Tue, 9 Sep

Austrian Airlines flights from London Heathrow Airport to Washington, D.C.

Our best Austrian Airlines deals on London Heathrow Airport to Washington, D.C. flight tickets
Austrian Airlines
17 Sept
LHR16:40London Heathrow
8h 15m
IAD19:55Washington, D.C. Dulles Intl
23 Sept
IAD18:40Washington, D.C. Dulles Intl
7h 15m
LHR06:55London Heathrow
€349
Find similar
Austrian Airlines
19 Nov
LHR06:00London Heathrow
13h 40m
1 stop
IAD14:40Washington, D.C. Dulles Intl
30 Nov
IAD18:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
€505
Find similar
Austrian Airlines
16 Nov
LHR09:05London Heathrow
34h 35m
1 stop
IAD14:40Washington, D.C. Dulles Intl
27 Nov
IAD17:10Washington, D.C. Dulles Intl
34h 15m
2 stops
LHR08:25London Heathrow
€511
Find similar

United Airlines flights from London Heathrow Airport to Washington, D.C.

Our best United Airlines deals on London Heathrow Airport to Washington, D.C. flight tickets
United Airlines
20 Sept
LHR14:05London Heathrow
22h 25m
2 stops
IAD07:30Washington, D.C. Dulles Intl
21 Sept
IAD18:40Washington, D.C. Dulles Intl
7h 15m
LHR06:55London Heathrow
€402
Find similar
United Airlines
17 Sept
LHR08:40London Heathrow
12h 35m
1 stop
IAD16:15Washington, D.C. Dulles Intl
23 Sept
IAD18:40Washington, D.C. Dulles Intl
7h 15m
LHR06:55London Heathrow
€499
Find similar
United Airlines
4 Sept
LHR08:40London Heathrow
12h 35m
1 stop
IAD16:15Washington, D.C. Dulles Intl
24 Sept
IAD18:40Washington, D.C. Dulles Intl
7h 15m
LHR06:55London Heathrow
€501
Find similar

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from London Heathrow Airport to Washington, D.C.

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Washington, D.C.?

The cheapest month to fly to Washington, D.C. from London Heathrow Airport is in February. Flight prices, which tend to average around €597, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Washington, D.C. from London Heathrow Airport during March instead. Flights to Washington, D.C. in March, while not as cheap as those in February, still average around €607.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

Flying to Washington, D.C. from London Heathrow Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as €875 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are €1,010 on average. Flights to Washington, D.C. from London Heathrow Airport in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to Washington, D.C.?

You are more likely to see cheaper flights to Washington, D.C. from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around €703 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from London Heathrow Airport for as low as €626 on momondo.

How have London Heathrow Airport to Washington, D.C. flight prices changed over time?

As of July 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 44% more expensive when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Washington, D.C. according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London Heathrow Airport to Washington, D.C. (LHR to WAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Washington, D.C.

Best price found

€501

Fastest flight time

8h 00m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from London Heathrow Airport in the past 72 hours is €501. The best return flight deal from London Heathrow Airport to Washington, D.C. found on momondo in the last 72 hours is €349.
The fastest flight from London Heathrow Airport to Washington, D.C. takes 8h 00m
Direct flights go from London Heathrow Airport to Washington, D.C. every day.
There are 2 airports near Washington, D.C.: Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
Search flight deals

  • How far is London Heathrow to Washington, D.C. by plane?

    Washington, D.C. is 5873.1 km away from London Heathrow. A reasonable flight in good conditions will take 8h 00m.

  • When did momondo last update prices for flights from London Heathrow Airport to Washington, D.C.?

    Prices for flights from London Heathrow Airport to Washington, D.C. are refreshed on a daily basis.

  • How old do you have to be to fly from London Heathrow Airport to Washington, D.C.?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Washington, D.C..

  • What documentation or ID do you need to fly to Washington, D.C.?

    The travel and health documents required for your trip to Washington, D.C. can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Washington, D.C.. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from London Heathrow Airport to Washington, D.C.?

Travelling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Gettysburg

Why use momondo?

Why should I use momondo to find a flight deal from London to Washington, D.C.?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Washington, D.C.. momondo saves you time and could save you money on your trip.

Can I find flights from London to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for London to Washington, D.C. flights to just show those with flexible booking policies.

How can momondo help me find flights from London to Washington, D.C.?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from London.

I’m not ready to book a flight from London to Washington, D.C. right now. Can momondo alert me if prices change?

If you are not ready to book a flight from London to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

An easier way to manage your Washington, D.C. trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 18/7
Fri 25/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 36.1 km from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport