Find cheap flights from London Heathrow Airport to Washington Dulles Airport

LHR - IAD

Find cheap flights from London Heathrow Airport to Washington Dulles Airport

Round-trip
Economy
London (LHR)
Washington Dulles Intl
Sun 8/2
Sun 8/9
Any month
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Good to know

Low season

February Best time to beat the crowds with an average 35% drop in price.

High season

July Most popular time to fly with an average 33% increase in price.

Average price of a round-trip

$720 (avg. price over the last 2 weeks)

Good deal for a round-trip

$701 or less

When to book flights from London Heathrow to Washington Dulles Intl

Estimated round-trip price
Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $601 or less.
  • The cheapest flight from London Heathrow Airport to Washington Dulles Airport was found 82 days before departure, on average.
  • Book at least 3 weeks before departure in order to get a below-average price.
  • High season is considered to be June, July and August. The cheapest month to fly is February.
  • Morning departure is around 12% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking London Heathrow Airport to Washington Dulles Airport flights

How long does a flight from London Heathrow Airport to Washington Dulles Airport take?

How many flights are there between London Heathrow Airport and Washington Dulles Airport?

Which airlines provide the cheapest flights from London Heathrow Airport to Washington Dulles Airport?

Do I need a passport to fly between London Heathrow Airport and Washington Dulles Airport?

Which airlines fly most frequently between London Heathrow Airport and Washington Dulles Airport?

What’s the cheapest day of the week to fly London Heathrow Airport to Washington Dulles Airport?

How does KAYAK find such low prices on flights from London Heathrow Airport to Washington Dulles Airport?

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London Heathrow Airport to Washington Dulles Airport?

What is the Hacker Fare option on flights from London Heathrow Airport to Washington Dulles Airport?

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London Heathrow Airport to Washington Dulles Airport?

Top airline flying London Heathrow to Washington Dulles Intl

Scores according to KAYAK customer reviews

7.2
TAP AIR PORTUGAL
Overall score based on 5,334 reviews
7.3
Boarding
7.2
Comfort
7.9
Crew
6.6
Entertainment
7.0
Food
Airline reviews
Read more about TAP AIR PORTUGAL

Book cheap flights from London Heathrow Airport to Washington Dulles Airport (round-trip)

Airports
Origin
London
$353
only
$353
Destination
Washington
$353
only
$353
Fri, Nov 20
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 10m
Mon, Nov 30
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
18h 30m
Trip: 11 days
Based on null reviews
Wed, Oct 28
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
24h 00m
Mon, Nov 9
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
21h 20m
Trip: 13 days
Based on null reviews
Fri, Oct 16
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
19h 10m
Wed, Oct 21
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
19h 20m
Trip: 6 days
Based on null reviews
Wed, Oct 28
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
24h 00m
Fri, Nov 6
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
22h 15m
Trip: 10 days
Based on null reviews
Fri, Oct 16
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 10m
Wed, Oct 21
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
15h 15m
Trip: 6 days
Based on null reviews
Mon, Nov 2
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
32h 45m
Tue, Nov 10
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
14h 10m
Trip: 9 days
Based on null reviews
Fri, Sep 18
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
20h 45m
Fri, Oct 2
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
14h 10m
Trip: 15 days
Based on null reviews
Wed, Oct 28
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
24h 00m
Tue, Nov 10
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
14h 10m
Trip: 14 days
Based on null reviews
Fri, Oct 30
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
23h 15m
Sat, Nov 7
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
18h 30m
Trip: 9 days
Based on null reviews
Wed, Oct 28
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
24h 00m
Thu, Nov 5
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
14h 10m
Trip: 9 days
Based on null reviews
Fri, Oct 16
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 10m
Wed, Oct 21
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
31h 25m
Trip: 6 days
Based on null reviews
Thu, Sep 24
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
33h 10m
Sat, Oct 10
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
12h 00m
Trip: 17 days
Based on null reviews
Sat, Oct 31
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 10m
Sat, Nov 7
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
23h 40m
Trip: 8 days
Based on null reviews
Sat, Oct 31
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 10m
Sat, Nov 7
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
23h 40m
Trip: 8 days
Based on null reviews
Thu, Oct 29
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
27h 20m
Thu, Nov 5
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
14h 10m
Trip: 8 days
Based on null reviews
Fri, Nov 20
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
27h 50m
Mon, Nov 30
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
13h 40m
Trip: 11 days
Based on null reviews
Thu, Oct 15
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
29h 20m
Thu, Oct 29
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
19h 55m
Trip: 15 days
Based on null reviews
Fri, Oct 30
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
23h 40m
Mon, Nov 9
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
21h 20m
Trip: 11 days
Based on null reviews
Wed, Oct 28
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
24h 40m
Fri, Nov 6
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
12h 25m
Trip: 10 days
Based on null reviews
Wed, Oct 28
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
24h 00m
Sat, Nov 7
IAD
Washington Dulles Airport
LHR
London Heathrow Airport
12h 25m
Trip: 11 days
Based on null reviews
Show more results

Book cheap flights from London Heathrow Airport to Washington Dulles Airport (one-way)

Airports
Origin
London
$171
only
$171
Destination
Washington
$171
only
$171
Fri, Sep 4
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
19h 55m
Based on null reviews
Fri, Sep 4
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 00m
Based on null reviews
Sat, Aug 22
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
34h 05m
Based on null reviews
Wed, Oct 7
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
15h 45m
Based on null reviews
Wed, Sep 2
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
15h 55m
Based on null reviews
Wed, Sep 2
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
15h 25m
Based on null reviews
Fri, Sep 4
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 00m
Based on null reviews
Wed, Sep 16
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
19h 55m
Based on null reviews
Tue, Oct 6
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
29h 55m
Based on null reviews
Tue, Oct 6
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 50m
Based on null reviews
Tue, Oct 6
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
18h 55m
Based on null reviews
Thu, Sep 3
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
32h 00m
Based on null reviews
Mon, Oct 5
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
29h 20m
Based on null reviews
Mon, Oct 5
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
42h 20m
Based on null reviews
Tue, Oct 6
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
29h 20m
Based on null reviews
Thu, Oct 8
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
36h 15m
Based on null reviews
Tue, Oct 6
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
19h 10m
Based on null reviews
Thu, Oct 1
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
41h 40m
Based on null reviews
Wed, Oct 7
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
13h 50m
Based on null reviews
Wed, Sep 30
LHR
London Heathrow Airport
IAD
Washington Dulles Airport
53h 05m
Based on null reviews
Show more results
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

^
The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.
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