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>

$305 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

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Travelers love KAYAK

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

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Cheapest round-trip

$579

Typical prices: $642-$835

Austrian Airlines

Sun 1/11Wed 1/21

IAD - LHR • Non-stop

Cheapest non-stop

$581

Typical prices: $697-$1,080

British Airways

Tue 12/30Tue 1/13

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

Sun, Jan 11 - Wed, Jan 21

6:20 pm - 6:40 amIAD-LHR

7h 20mnonstop

6:00 am - 2:40 pmLHR-IAD

13h 40m1 stop

$579Austrian Airlines

Find Deal

Sat, Feb 14 - Sat, Feb 21

8:30 pm - 4:25 pmIAD-LHR

14h 55m2 stops

6:40 am - 6:50 pmLHR-IAD

17h 10m2 stops

$580Scandinavian Airlines

Find Deal

Tue, Dec 30 - Tue, Jan 13

9:45 pm - 10:00 amIAD-LHR

7h 15mnonstop

12:10 pm - 3:35 pmLHR-IAD

8h 25mnonstop

$581British Airways

Find Deal

Mon, Dec 1 - Wed, Dec 10

9:45 pm - 10:00 amIAD-LHR

7h 15mnonstop

4:25 pm - 7:55 pmLHR-IAD

8h 30mnonstop

$582British Airways

Find Deal

Mon, Mar 2 - Tue, Mar 10

8:30 pm - 4:25 pmIAD-LHR

14h 55m2 stops

9:05 pm - 6:15 pmLHR-IAD

25h 10m2 stops

$583Scandinavian Airlines

Find Deal

Wed, Dec 10 - Thu, Dec 18

6:00 am - 9:20 pmIAD-LHR

10h 20m1 stop

4:20 pm - 8:15 pmLHR-IAD

8h 55mnonstop

$587United Airlines

Find Deal

Wed, Dec 10 - Thu, Dec 18

4:10 pm - 7:10 amDCA-LHR

10h 00m1 stop

8:00 am - 2:51 pmLHR-DCA

11h 51m1 stop

$592United Airlines

Find Deal

Thu, Jan 22 - Mon, Jan 26

6:00 am - 7:10 amDCA-LHR

20h 10m1 stop

6:50 am - 3:28 pmLHR-DCA

13h 38m2 stops

$593Multiple Airlines

Find Deal

Sat, Jan 24 - Sun, Feb 1

11:05 am - 7:10 amDCA-LHR

15h 05m1 stop

6:50 am - 9:58 pmLHR-DCA

20h 08m2 stops

$594Multiple Airlines

Find Deal

Sun, Nov 30 - Wed, Dec 10

5:24 pm - 9:15 amDCA-LHR

10h 51m1 stop

10:05 am - 4:55 pmLHR-DCA

11h 50m1 stop

$597American Airlines

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	$305

Best time to beat the crowds with an average 11% 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 AirlinesIAD-LHRFeb 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 AirwaysIAD-LHROct 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 AirlinesIAD-LHRJun 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

Wembley

Hayes

Richmond

Luton

Ilford

Salisbury

Crawley

Guildford

Watford

Kingston upon Thames

Eastbourne

Colchester

Ipswich

St. Albans

Northampton

Swindon

Twickenham

Harrow

Everything you need to know for your flight to Heathrow

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Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

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Information on your arrival and departure airports

London Heathrow Airport (LHR)

LHR

$303 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

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