How does KAYAK find such low prices on flights from District of Columbia to London Heathrow Airport?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from District of Columbia to London Heathrow Airport. Visit our flight page for the latest deals!>/a>

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from District of Columbia is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from District of Columbia to London Heathrow Airport?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London Heathrow Airport with an airline and back to District of Columbia with another airline. Visit our flight page for the latest deals!>/a>

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

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$361 CHEAP FLIGHTS from District of Columbia to London Heathrow (LHR)

LHR

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$524

Overall average: $710

Icelandair

Fri 1/30Thu 2/5

IAD - LHR • 1 stop

Cheapest non-stop

$582

Typical prices: $634-$858

Iberia

Wed 3/11Wed 3/18

IAD - LHR • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Heathrow!

Flight Deals

Cheap Flights from District of Columbia to Heathrow

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from District of Columbia to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from District of Columbia to Heathrow

Fri, Jan 30 - Thu, Feb 5

7:40 pm - 7:30 pm

IAD

LHR

18h 50m

1 stop

8:35 pm - 6:30 pm

LHR

IAD

26h 55m

1 stop

$524Icelandair

Tue, Apr 7 - Sun, Apr 12

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

9:25 pm - 7:20 pm

LHR

IAD

26h 55m

1 stop

$525Icelandair

Fri, May 1 - Sun, May 3

8:30 pm - 8:20 pm

IAD

LHR

18h 50m

1 stop

1:05 pm - 7:20 pm

LHR

IAD

11h 15m

1 stop

$526Icelandair

Thu, May 14 - Mon, May 18

8:30 pm - 8:20 pm

IAD

LHR

18h 50m

1 stop

1:05 pm - 7:20 pm

LHR

IAD

11h 15m

1 stop

$528Icelandair

Wed, Mar 4 - Wed, Mar 11

10:30 pm - 3:30 pm

IAD

LHR

12h 00m

1 stop

8:15 am - 10:00 pm

LHR

IAD

17h 45m

1 stop

$535TAP AIR PORTUGAL

Wed, Mar 11 - Mon, Mar 16

11:30 pm - 6:55 pm

IAD

LHR

15h 25m

1 stop

6:30 pm - 3:35 pm

LHR

IAD

25h 05m

1 stop

$536TAP AIR PORTUGAL

Mon, Jan 26 - Tue, Feb 3

4:15 pm - 7:10 am

DCA

LHR

9h 55m

1 stop

1:25 pm - 9:56 pm

LHR

DCA

13h 31m

1 stop

$564Air Canada

Wed, Mar 4 - Wed, Mar 11

12:55 pm - 7:10 am

DCA

LHR

13h 15m

2 stops

6:50 am - 9:56 pm

LHR

DCA

19h 06m

2 stops

$565Multiple Airlines

Sun, Jan 25 - Tue, Feb 10

12:55 pm - 7:10 am

DCA

LHR

13h 15m

2 stops

6:50 am - 3:31 pm

LHR

DCA

13h 41m

2 stops

$567Multiple Airlines

Sun, Jan 25 - Tue, Feb 3

12:55 pm - 9:20 am

DCA

LHR

15h 25m

1 stop

1:25 pm - 10:21 am

LHR

DCA

25h 56m

1 stop

$571Air Canada

Useful Info

Low season	January
High season	July
Cheapest flight	$361

Best time to beat the crowds with an average 10% drop in price.

Most popular time to fly with an average 18% increase in price.

Flight from Reagan Washington National Airport to London Heathrow Airport

DeeFlew with United Airlines

IAD

LHR

Feb 2025

For me the best route to LHR is the late night departure on UAL. The flight is often roughly 6.5 hours so I skip dinner, use an eye mask and earplugs and try to sleep.

EllenFlew with British Airways

IAD

LHR

Oct 2024

Do not check your bag if at all possible, especially if you have a connecting flight. Your bag will not make it.

CraigFlew with United Airlines

IAD

LHR

Jun 2024

Get to beginning of boarding group early. Bring as little on board as possible due to small overhead bin space.

How does KAYAK find such low prices on flights from District of Columbia to London Heathrow Airport?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from District of Columbia to London Heathrow Airport.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from District of Columbia to London Heathrow Airport?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from District of Columbia is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from District of Columbia to London Heathrow Airport?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London Heathrow Airport with an airline and back to District of Columbia with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from District of Columbia to London Heathrow Airport?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Hounslow

Slough

Hayes

Wembley

Richmond

Luton

Salisbury

Ilford

Crawley

Watford

Eastbourne

Guildford

Kingston upon Thames

Colchester

Swindon

St. Albans

Northampton

Twickenham

Ipswich

Bedford

Everything you need to know for your flight to Heathrow

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on your arrival and departure airports

London Heathrow Airport (LHR)

LHR

$361 Find Cheap Flights from District of Columbia to London Heathrow Airport

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

Everything you should know

Cheap Flights from District of Columbia to Heathrow

Recent round-trip flight deals from District of Columbia to Heathrow

Recent one-way flight deals from District of Columbia to Heathrow

Recent last minute flight deals from District of Columbia to Heathrow

Recent direct flight deals from District of Columbia to Heathrow

Good to know

Flights from District of Columbia to Heathrow: the best tips from KAYAK users

FAQs for booking District of Columbia to London Heathrow Airport flights

How does KAYAK find such low prices on flights from District of Columbia to London Heathrow Airport?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from District of Columbia to London Heathrow Airport.

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from District of Columbia is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from District of Columbia to London Heathrow Airport?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London Heathrow Airport with an airline and back to District of Columbia with another airline.

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

Traveling to a place near Heathrow?

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

Cabin class types available on flights to Heathrow

Complete your trip to Heathrow with a hotel stay or car rental

Find direct flights for Heathrow

Flights to other popular destinations

Flights from domestic origins to District of Columbia

Choose which airport to fly into in London

Find deals for your return flight