What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Reykjavik (KEF) – chosen by Cheapflights users on 65% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to London Heathrow Airport on Cheapflights.

Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Flights via Dublin (DUB) offer the fastest connection on this route, with an average layover time of 1h 28m.

What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 9h 40m.

What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Dublin (DUB) is the most affordable 1-stop option, with an average round-trip price of $479.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

The most flights from IAD to LHR are scheduled on a Monday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Consider Aeromexico (100%), KLM (70%) or Air France (70%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

American Airlines, Air Canada and Finnair are the most popular airlines when flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.

Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Most of the time, Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights that have layovers will stop in Reykjavik.

Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights?

Flights departing from Washington, D.C. Dulles Intl Airport and landing in London Heathrow Airport layover in Dublin least frequently.

What are some popular things to do or see while on a layover in Reykjavik?

Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Harpa, Hallgrímskirkja and Laugardalslaug Geothermal Pool are located about 23.3 mi, 23.2 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl if you are interested in checking them out. Travelers can book a car rental at Reykjavik Keflavik Intl for about $58 per day to make their sightseeing more efficient.

What is the cheapest day to fly round-trip from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 18% on the overall cost on flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

January can be a great time to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport with a flight ticket averaging about $732. Cheapflights users have found deals in the month of January for as cheap as $389. The most expensive prices can be found in the month of June.

Can I find deals for flights from Dulles Intl to Heathrow that include hotel bookings?

Yes. In addition to deals on Dulles Intl to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Dulles Intl to Heathrow?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Heathrow.

Can I find deals for business class flights from Dulles Intl to Heathrow?

Yes. Cheapflights offers flight deals from Dulles Intl to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$263+ Cheap Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in September or October, booked 63 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap flight deals from Dulles Intl to Heathrow

Round-trip from	$491 (Gotogate)
One-way from	$263 (Booking.com)
Popular in	June
Cheapest in	September
Average price	$673
Good round-trip deal	$635 or less
Good one-way deal	$384 or less

From Washington, D.C. Dulles Intl to London Heathrow

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One-way flight from Washington, D.C. Dulles Intl to London Heathrow

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Highest demand for flights based on searches. 14% potential increase in price ($127 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).

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Average for round-trip flights in September 2025

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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.

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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London Heathrow.

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Find flight deals from Dulles Intl to Heathrow

Cheapest flights from Dulles Intl to Heathrow
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Wed 10/88:30 pmIAD - LHR

1 stop18h 50mIcelandair

Wed 10/151:05 pmLHR - IAD

1 stop14h 05mIcelandair

Deal found 9/10

$491

Tue 10/78:30 pmIAD - LHR

1 stop10h 25mIcelandair

Tue 10/149:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/9

$493

Sat 10/48:30 pmIAD - LHR

1 stop10h 25mIcelandair

Wed 10/159:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/10

$494

Thu 11/277:40 pmIAD - LHR

1 stop18h 50mIcelandair

Wed 12/312:15 pmLHR - IAD

1 stop11h 15mIcelandair

Deal found 9/9

$495

Mon 10/68:30 pmIAD - LHR

1 stop10h 25mIcelandair

Fri 10/101:05 pmLHR - IAD

1 stop14h 05mIcelandair

Deal found 9/11

$496

Wed 10/811:15 pmIAD - LHR

1 stop16h 05mIcelandair

Wed 10/2912:15 pmLHR - IAD

1 stop11h 15mIcelandair

Deal found 9/10

$497

Tue 9/308:30 pmIAD - LHR

1 stop18h 50mIcelandair

Sun 10/59:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/11

$498

Mon 11/107:40 pmIAD - LHR

1 stop10h 10mIcelandair

Thu 11/208:35 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/10

$499

Wed 10/88:30 pmIAD - LHR

1 stop10h 25mIcelandair

Tue 10/149:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/8

$500

Sun 10/58:30 pmIAD - LHR

1 stop10h 25mIcelandair

Tue 10/219:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/9

$501

Tue 9/238:30 pmIAD - LHR

1 stop10h 25mIcelandair

Thu 10/91:05 pmLHR - IAD

1 stop11h 15mIcelandair

Deal found 9/11

$502

Tue 9/2310:20 pmIAD - LHR

1 stop19h 35mTAP AIR PORTUGAL

Wed 11/196:30 pmLHR - IAD

1 stop25h 45mTAP AIR PORTUGAL

Deal found 9/10

$504

Best flights from Dulles Intl to Heathrow
Discover carefully curated flight deals from Dulles Intl to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2025.

Wed 12/107:40 pmIAD - LHR

1 stop18h 50mIcelandair

Sat 1/1712:15 pmLHR - IAD

1 stop11h 15mIcelandair

Deal found 9/9

$522

Tue 9/2312:08 pmIAD - LHR

2 stops16h 27mScandinavian Airlines

Tue 10/76:40 amLHR - IAD

1 stop18h 19mScandinavian Airlines

Deal found 9/9

$558

Tue 10/2110:25 pmIAD - LHR

Nonstop7h 15mUnited Airlines

Thu 10/3012:05 pmLHR - IAD

1 stop33h 35mUnited Airlines

Deal found 9/8

$567

Wed 9/245:50 pmIAD - LHR

Nonstop7h 30mDelta

Fri 10/39:00 amLHR - IAD

1 stop15h 15mDelta

Deal found 9/9

$579

Tue 12/210:15 pmIAD - LHR

Nonstop7h 35mUnited Airlines

Thu 12/111:45 pmLHR - IAD

1 stop31h 55mUnited Airlines

Deal found 9/11

$569

Wed 2/48:30 pmIAD - LHR

2 stops14h 55mScandinavian Airlines

Mon 2/910:20 amLHR - IAD

1 stop11h 55mScandinavian Airlines

Deal found 9/9

$577

Mon 9/225:50 pmIAD - LHR

Nonstop7h 30mDelta

Wed 10/111:30 amLHR - IAD

1 stop12h 45mDelta

Deal found 9/11

$580

Wed 12/106:20 pmIAD - LHR

Nonstop7h 20mUnited Airlines

Mon 12/1512:05 pmLHR - IAD

1 stop33h 35mUnited Airlines

Deal found 9/9

$569

Wed 10/87:59 pmIAD - LHR

1 stop10h 26mDelta

Thu 10/168:40 amLHR - IAD

1 stop11h 55mDelta

Deal found 9/9

$585

Wed 9/246:40 pmIAD - LHR

Nonstop7h 15mUnited Airlines

Fri 10/38:40 amLHR - IAD

1 stop12h 35mUnited Airlines

Deal found 9/10

$569

Sun 11/2310:15 pmIAD - LHR

Nonstop7h 35mUnited Airlines

Wed 12/36:35 amLHR - IAD

1 stop18h 30mUnited Airlines

Deal found 9/10

$572

Wed 1/1410:15 pmIAD - LHR

Nonstop7h 35mUnited Airlines

Tue 1/206:50 amLHR - IAD

1 stop12h 45mUnited Airlines

Deal found 9/10

$576

Last-minute flights from Dulles Intl to Heathrow
Discover last-minute flight deals from Dulles Intl to Heathrow. Data last updated September 11, 2025 and is based on user searches.

Tue 9/238:30 pmIAD - LHR

1 stop10h 25mIcelandair

Thu 10/91:05 pmLHR - IAD

1 stop11h 15mIcelandair

Deal found 9/11

$502

Tue 9/2310:20 pmIAD - LHR

1 stop19h 35mTAP AIR PORTUGAL

Wed 11/196:30 pmLHR - IAD

1 stop25h 45mTAP AIR PORTUGAL

Deal found 9/10

$504

Mon 9/298:30 pmIAD - LHR

1 stop18h 50mIcelandair

Mon 10/69:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/11

$505

Tue 9/308:30 pmIAD - LHR

1 stop10h 25mIcelandair

Wed 11/1212:15 pmLHR - IAD

1 stop11h 15mIcelandair

Deal found 9/11

$498

Sat 10/48:30 pmIAD - LHR

1 stop10h 25mIcelandair

Wed 10/159:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/10

$494

Sat 10/48:30 pmIAD - LHR

1 stop10h 25mIcelandair

Wed 10/89:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/10

$499

Sun 10/58:30 pmIAD - LHR

1 stop10h 25mIcelandair

Tue 10/219:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/9

$501

Mon 10/68:30 pmIAD - LHR

1 stop10h 25mIcelandair

Fri 10/101:05 pmLHR - IAD

1 stop14h 05mIcelandair

Deal found 9/11

$496

Tue 10/78:30 pmIAD - LHR

1 stop10h 25mIcelandair

Tue 10/149:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/9

$493

Wed 10/88:30 pmIAD - LHR

1 stop18h 50mIcelandair

Wed 10/151:05 pmLHR - IAD

1 stop14h 05mIcelandair

Deal found 9/10

$491

Wed 10/811:15 pmIAD - LHR

1 stop16h 05mIcelandair

Wed 10/2912:15 pmLHR - IAD

1 stop11h 15mIcelandair

Deal found 9/10

$497

Wed 10/88:30 pmIAD - LHR

1 stop10h 25mIcelandair

Tue 10/149:25 pmLHR - IAD

1 stop26h 55mIcelandair

Deal found 9/8

$500

One-way flights from Dulles Intl to Heathrow
Search for one-way flight options from Dulles Intl to Heathrow. Find affordable one-way fares based on user searches. Data last updated September 11, 2025.

Fri 10/3111:30 pmIAD - LHR

1 stop33h 10mTAP AIR PORTUGAL

Deal found 9/9

$263

Fri 11/710:30 pmIAD - LHR

1 stop15h 25mTAP AIR PORTUGAL

Deal found 9/10

$265

Mon 11/175:58 pmIAD - LHR

2 stops37h 52mMultiple Airlines

Deal found 9/9

$266

Mon 11/245:30 pmIAD - LHR

1 stop14h 10mTAP AIR PORTUGAL

Deal found 9/11

$267

Mon 11/105:30 pmIAD - LHR

2 stops18h 45mMultiple Airlines

Deal found 9/9

$270

Wed 10/812:41 pmIAD - LHR

2 stops18h 24mMultiple Airlines

Deal found 9/10

$271

Fri 11/73:25 pmIAD - LHR

2 stops21h 05mMultiple Airlines

Deal found 9/10

$272

Sat 10/187:15 amIAD - LHR

3 stops30h 35mMultiple Airlines

Deal found 9/10

$275

Wed 10/159:00 amIAD - LHR

3 stops25h 35mMultiple Airlines

Deal found 9/10

$276

Thu 10/236:15 amIAD - LHR

3 stops23h 45mMultiple Airlines

Deal found 9/11

$278

Tue 11/115:30 pmIAD - LHR

2 stops23h 10mMultiple Airlines

Deal found 9/10

$279

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 12/10

7:40 pm-7:30 pm

1 stop18h 50m

London Heathrow

Sat 1/17

12:15 pm-6:30 pm

1 stop11h 15m

$522

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 9/23

12:08 pm-9:35 am

2 stops16h 27m

London Heathrow

Tue 10/7

6:40 am-7:59 pm

1 stop18h 19m

$558

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 10/21

10:25 pm-10:40 am

Nonstop7h 15m

London Heathrow

Thu 10/30

12:05 pm-5:40 pm

1 stop33h 35m

$567

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/2

10:15 pm-10:50 am

Nonstop7h 35m

London Heathrow

Thu 12/11

1:45 pm-4:40 pm

1 stop31h 55m

$569

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 12/10

6:20 pm-6:40 am

Nonstop7h 20m

London Heathrow

Mon 12/15

12:05 pm-4:40 pm

1 stop33h 35m

$569

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 9/24

6:40 pm-6:55 am

Nonstop7h 15m

London Heathrow

Fri 10/3

8:40 am-4:15 pm

1 stop12h 35m

$569

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 11/23

10:15 pm-10:50 am

Nonstop7h 35m

London Heathrow

Wed 12/3

6:35 am-8:05 pm

1 stop18h 30m

$572

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 1/14

10:15 pm-10:50 am

Nonstop7h 35m

London Heathrow

Tue 1/20

6:50 am-2:35 pm

1 stop12h 45m

$576

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 2/4

8:30 pm-4:25 pm

2 stops14h 55m

London Heathrow

Mon 2/9

10:20 am-5:15 pm

1 stop11h 55m

$577

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 9/24

5:50 pm-6:20 am

Nonstop7h 30m

London Heathrow

Fri 10/3

9:00 am-7:15 pm

1 stop15h 15m

$579

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 24 results

The best insider tips for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to London Heathrow Airport trip

Airports

IAD

For evening departures, expect crowded check-in areas at IAD. Arrive early to navigate the busy terminal efficiently.

LHR

Take the Heathrow Express for the fastest route to central London. It connects to Paddington Station, offering further transit options.

Our travel experts

Ramsey Qubein

Expert on LHR and IAD

Best time to book a flight from Dulles Intl to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Dulles Intl with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Prices

Airlines

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, you should look to book at least 63 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of $661). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,098). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to LHR?

It’s optimal to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the afternoon. By choosing this option you can save up to 4% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight should consider departing on Wednesday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Heathrow

Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, such as United Airlines, Virgin Atlantic, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

United Airlines

7.4

Good

8,937 reviews

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Virgin Atlantic

7.4

Good

664 reviews

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

American Airlines

7.2

Good

10,000 reviews

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Iberia

7.0

Good

2,929 reviews

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

British Airways

6.7

Okay

7,361 reviews

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

How long is the flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
There are many flights that can get you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 7h 15m. Fly via Icelandair, Scandinavian Airlines, or United Airlines to get the fastest option. The distance between Washington, D.C. Dulles Intl Airport and London Heathrow Airport is about 3664 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport round-trip?
PLAY, at $372, was found to be the cheapest airline from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.Alternate airlines to your destination round-trip include Scandinavian Airlines and Icelandair. PLAY is priced at 50% lower than the current average price of a flight leaving 3 months from now.
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Consider Aeromexico (100%), KLM (70%) or Air France (70%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
On average you can expect to pay $1,974 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is $347 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at $424.
Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Most of the time, Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights that have layovers will stop in Reykjavik.
What are some popular things to do or see while on a layover in Reykjavik?
Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Harpa, Hallgrímskirkja and Laugardalslaug Geothermal Pool are located about 23.3 mi, 23.2 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl if you are interested in checking them out. Travelers can book a car rental at Reykjavik Keflavik Intl for about $58 per day to make their sightseeing more efficient.
Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights?
Flights departing from Washington, D.C. Dulles Intl Airport and landing in London Heathrow Airport layover in Dublin least frequently.
Can I find deals for flights from Dulles Intl to Heathrow that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Heathrow.
Can I find deals for business class flights from Dulles Intl to Heathrow?
Yes. Cheapflights offers flight deals from Dulles Intl to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of $661). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,098). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 10 airlines flying from Dulles Intl to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
PLAY	Cheapest$372	Average$539	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$424	Average$597	FlexibilityNo cancel fee	On-time77%
Icelandair	Cheapest$433	Average$571	FlexibilityNo cancel fee	On-time76%
TAP AIR PORTUGAL	Cheapest$441	Average$686	FlexibilityNo cancel fee	On-timeN/A
Lufthansa	Cheapest$447	Average$801	FlexibilityNo cancel fee	On-time76%
Air Canada	Cheapest$549	Average$759	FlexibilityNo cancel fee	On-time67%
British Airways	Cheapest$549	Average$785	FlexibilityNo cancel fee	On-time70%
Virgin Atlantic	Cheapest$562	Average$813	FlexibilityNo cancel fee	On-time72%
United Airlines	Cheapest$563	Average$789	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$569	Average$810	FlexibilityNo cancel fee	On-timeN/A

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$263+ Cheap flights from Dulles Intl (IAD) to Heathrow (LHR)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/31. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in September or October, booked 63 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

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Cheapest flights from Dulles Intl to HeathrowExplore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

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Best time to book a flight from Dulles Intl to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Dulles Intl with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

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Weekly flight availability from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

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Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

What are some popular things to do or see while on a layover in Reykjavik?

Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights?

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Top 10 airlines flying from Dulles Intl to Heathrow

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Cheapest flights from Dulles Intl to Heathrow
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.