What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London one-way?

The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as $302. However, be on the lookout for offers from TAP AIR PORTUGAL and Virgin Atlantic, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to London for a low price.

What are the most popular routes from Washington, D.C. Dulles Intl Airport to London?

When deciding which route to take from Washington, D.C. Dulles Intl Airport to London consider Washington, D.C. Dulles Intl - London Heathrow, Washington, D.C. Dulles Intl - London Gatwick or Washington, D.C. Dulles Intl - London City as they are the most popular.

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

While on average a flight from Washington, D.C. Dulles Intl Airport to London is generally $2,488, our data shows the cheapest flight currently is $376. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $426 for that flight.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to London on time: Aer Lingus (73%), Finnair (73%), KLM (72%).

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

The most popular airlines flying from Washington, D.C. Dulles Intl Airport to London are American Airlines, Air Canada and Finnair. Something to consider prior to booking your flight.

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

Of the flights from Washington, D.C. Dulles Intl Airport to London that have layovers, most of them stop in Reykjavik.

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

The least popular layover on flights from Washington, D.C. Dulles Intl Airport to London is Dublin.

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

Reykjavik travelers tend to visit Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool more than anywhere else. Hallgrímskirkja, Harpa and Laugardalslaug Geothermal Pool are located about 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl if you are interested in checking them out. Those landing in Reykjavik looking to spend some time exploring during their layover can rent a car for about $66 per day.

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

It’s generally more expensive to depart on a Tuesday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

The best pricing can be found in the month of January. Prices to London from Washington, D.C. Dulles Intl Airport average $743. You can even find prices in January for less than $743, as users have found deals to London from as low as $385. The month of June appears to be one of the more expensive times to travel to London from Washington, D.C. Dulles Intl Airport. Flying in the targeted month can save you up to 29%.

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

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

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

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

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

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

$298+ Flights from Washington, D.C. Dulles Intl Airport to London

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London are usually found in January or October, booked 81 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from Dulles Intl to London

Round-trip from	$656 (Mytrip)
One-way from	$299 (Kiwi.com)
Popular in	June
Cheapest in	January
Average price	$985
Good round-trip deal	$687 or less
Good one-way deal	$446 or less

From Washington, D.C. Dulles Intl to London (LON)

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One-way flight from Washington, D.C. Dulles Intl to London (LON)

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Highest demand for flights based on searches. 14% potential increase in price ($124 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

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

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

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Find flight deals from Dulles Intl to London

Cheapest flights from Dulles Intl to London
Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Fri 8/159:45 amIAD - STN

2 stops21h 20mMultiple Airlines

Tue 8/199:45 pmSTN - IAD

3 stops28h 16mMultiple Airlines

Deal found 6/10

$656

Fri 8/158:30 pmIAD - LGW

1 stop10h 15mIcelandair

Mon 8/253:40 pmLGW - IAD

1 stop11h 30mIcelandair

Deal found 6/9

$656

Wed 7/306:35 pmIAD - LHR

Nonstop7h 20mUnited Airlines

Mon 8/412:10 pmLHR - IAD

1 stop33h 05mUnited Airlines

Deal found 6/10

$656

Tue 7/229:35 amIAD - LHR

1 stop15h 55mMultiple Airlines

Mon 7/288:05 pmLHR - IAD

1 stop25h 10mMultiple Airlines

Deal found 6/9

$657

Mon 7/712:00 pmIAD - LHR

1 stop20h 10mDelta

Mon 7/218:10 pmLHR - IAD

1 stop20h 52mDelta

Deal found 6/9

$658

Fri 7/188:45 pmIAD - LGW

1 stop16h 05mSWISS

Wed 7/236:35 pmLGW - IAD

1 stop26h 40mSWISS

Deal found 6/9

$659

Sun 8/2410:05 pmIAD - LHR

1 stop18h 35mScandinavian Airlines

Sun 10/1910:20 amLHR - IAD

1 stop14h 39mScandinavian Airlines

Deal found 6/10

$659

Fri 7/2510:40 pmIAD - LHR

Nonstop7h 25mAmerican Airlines

Fri 8/12:25 pmLHR - IAD

Nonstop8h 05mAmerican Airlines

Deal found 6/10

$661

Thu 9/44:30 pmIAD - LGW

1 stop13h 45mITA Airways

Mon 9/812:05 pmLGW - IAD

1 stop31h 35mITA Airways

Deal found 6/12

$663

Tue 9/28:45 pmIAD - LCY

1 stop17h 00mSWISS

Tue 9/97:20 pmLCY - IAD

1 stop25h 55mSWISS

Deal found 6/10

$663

Mon 7/1410:40 pmIAD - LHR

Nonstop7h 25mIberia

Mon 7/214:25 pmLHR - IAD

1 stop23h 34mIberia

Deal found 6/12

$663

Mon 9/16:00 amIAD - LGW

2 stops23h 00mDelta

Mon 9/812:00 pmLGW - IAD

1 stop12h 43mDelta

Deal found 6/10

$664

Best flights from Dulles Intl to London
Discover carefully curated flight deals from Dulles Intl to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2025.

Fri 8/159:45 amIAD - STN

2 stops21h 20mMultiple Airlines

Tue 8/199:45 pmSTN - IAD

3 stops28h 16mMultiple Airlines

Deal found 6/10

$656

Fri 8/158:30 pmIAD - LGW

1 stop10h 15mIcelandair

Mon 8/253:40 pmLGW - IAD

1 stop11h 30mIcelandair

Deal found 6/9

$656

Mon 7/712:00 pmIAD - LHR

1 stop20h 10mDelta

Mon 7/218:10 pmLHR - IAD

1 stop20h 52mDelta

Deal found 6/9

$658

Fri 7/188:45 pmIAD - LGW

1 stop16h 05mSWISS

Wed 7/236:35 pmLGW - IAD

1 stop26h 40mSWISS

Deal found 6/9

$659

Sun 8/2410:05 pmIAD - LHR

1 stop18h 35mScandinavian Airlines

Sun 10/1910:20 amLHR - IAD

1 stop14h 39mScandinavian Airlines

Deal found 6/10

$659

Fri 7/2510:40 pmIAD - LHR

Nonstop7h 25mAmerican Airlines

Fri 8/12:25 pmLHR - IAD

Nonstop8h 05mAmerican Airlines

Deal found 6/10

$661

Fri 8/296:20 amIAD - LHR

1 stop9h 20mUnited Airlines

Fri 9/52:05 pmLHR - IAD

2 stops26h 49mUnited Airlines

Deal found 6/10

$662

Thu 9/45:50 pmIAD - LGW

2 stops21h 35mTAP AIR PORTUGAL

Tue 9/94:25 pmLGW - IAD

1 stop27h 55mTAP AIR PORTUGAL

Deal found 6/10

$663

Mon 7/1410:40 pmIAD - LHR

Nonstop7h 25mIberia

Mon 7/214:25 pmLHR - IAD

1 stop23h 34mIberia

Deal found 6/10

$663

Tue 8/264:30 pmIAD - LCY

1 stop12h 35mITA Airways

Wed 9/38:30 amLCY - IAD

1 stop35h 10mITA Airways

Deal found 6/12

$665

Wed 7/305:50 pmIAD - LHR

Nonstop7h 30mVirgin Atlantic

Mon 8/412:35 pmLHR - IAD

Nonstop8h 25mVirgin Atlantic

Deal found 6/11

$670

Thu 7/105:35 pmIAD - LHR

1 stop22h 20mBrussels Airlines

Wed 7/2311:05 amLHR - IAD

1 stop31h 25mBrussels Airlines

Deal found 6/12

$672

Last-minute flights from Dulles Intl to London
Discover last-minute flight deals from Dulles Intl to London. Data last updated June 12, 2025 and is based on user searches.

Tue 6/172:25 pmIAD - LGW

2 stops16h 55mMultiple Airlines

Tue 6/249:35 pmLGW - IAD

2 stops23h 15mMultiple Airlines

Deal found 6/10

$809

Tue 6/172:25 pmIAD - STN

2 stops27h 30mMultiple Airlines

Tue 6/2410:35 pmSTN - IAD

2 stops22h 15mMultiple Airlines

Deal found 6/10

$841

Tue 6/172:25 pmIAD - LTN

2 stops17h 10mMultiple Airlines

Tue 6/249:50 pmLTN - IAD

2 stops23h 00mMultiple Airlines

Deal found 6/10

$841

Tue 6/1710:20 amIAD - LHR

2 stops29h 40mAir Canada

Fri 6/202:05 pmLHR - IAD

3 stops35h 59mAir Canada

Deal found 6/12

$970

Tue 6/175:50 pmIAD - LHR

Nonstop7h 30mDelta

Tue 8/1212:35 pmLHR - IAD

Nonstop8h 25mDelta

Deal found 6/10

$1,105

Tue 6/179:05 pmIAD - LGW

1 stop13h 35mRoyal Air Maroc

Mon 6/234:40 pmLGW - IAD

1 stop31h 25mRoyal Air Maroc

Deal found 6/10

$1,161

Tue 6/175:20 pmIAD - LHR

1 stop9h 40mAer Lingus

Tue 8/129:10 pmLHR - IAD

1 stop23h 40mAer Lingus

Deal found 6/11

$1,168

Fri 6/2010:05 pmIAD - LHR

1 stop12h 55mScandinavian Airlines

Sat 8/165:00 pmLHR - IAD

1 stop31h 59mScandinavian Airlines

Deal found 6/10

$1,063

Fri 6/208:30 pmIAD - LGW

1 stop10h 15mIcelandair

Tue 6/243:40 pmLGW - IAD

1 stop32h 40mIcelandair

Deal found 6/11

$1,071

Fri 6/2010:40 pmIAD - LHR

Nonstop7h 25mBritish Airways

Sat 8/1611:00 amLHR - IAD

1 stop13h 49mBritish Airways

Deal found 6/11

$1,167

Sun 6/228:30 pmIAD - LHR

1 stop10h 25mIcelandair

Wed 7/99:25 pmLHR - IAD

1 stop29h 45mIcelandair

Deal found 6/9

$1,058

Sun 6/224:30 pmIAD - LGW

1 stop13h 45mITA Airways

Mon 7/712:05 pmLGW - IAD

1 stop31h 35mITA Airways

Deal found 6/10

$1,147

One-way flights from Dulles Intl to London
Search for one-way flight options from Dulles Intl to London. Find affordable one-way fares based on user searches. Data last updated June 12, 2025.

Wed 8/610:20 pmIAD - LGW

2 stops16h 20mMultiple Airlines

Deal found 6/12

$299

Mon 7/711:35 amIAD - STN

2 stops25h 25mMultiple Airlines

Deal found 6/12

$300

Sun 8/1711:15 pmIAD - LHR

2 stops14h 35mMultiple Airlines

Deal found 6/12

$301

Fri 9/58:30 pmIAD - LGW

1 stop10h 15mIcelandair

Deal found 6/10

$302

Fri 9/511:15 pmIAD - LHR

1 stop16h 05mIcelandair

Deal found 6/10

$302

Tue 7/2211:15 pmIAD - LTN

2 stops18h 40mMultiple Airlines

Deal found 6/11

$302

Mon 7/1410:20 pmIAD - LHR

1 stop14h 25mTAP AIR PORTUGAL

Deal found 6/10

$304

Thu 7/108:30 pmIAD - SEN

3 stops31h 10mMultiple Airlines

Deal found 6/9

$335

Tue 7/295:00 pmIAD - LGW

1 stop17h 35mTAP AIR PORTUGAL

Deal found 6/11

$338

Mon 9/2211:35 amIAD - LCY

2 stops24h 55mMultiple Airlines

Deal found 6/10

$350

Tue 7/225:50 pmIAD - LHR

Nonstop7h 30mVirgin Atlantic

Deal found 6/12

$362

Tue 9/910:05 pmIAD - LHR

1 stop12h 55mScandinavian Airlines

Deal found 6/11

$366

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Fri 8/15

9:45 am-12:05 pm

2 stops21h 20m

London Stansted

Tue 8/19

9:45 pm-9:01 pm

3 stops28h 16m

$656

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Fri 8/15

8:30 pm-11:45 am

1 stop10h 15m

London Gatwick

Mon 8/25

3:40 pm-10:10 pm

1 stop11h 30m

$656

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 7/30

6:35 pm-6:55 am

Nonstop7h 20m

London Heathrow

Mon 8/4

12:10 pm-4:15 pm

1 stop33h 05m

$656

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 7/22

9:35 am-6:30 am

1 stop15h 55m

London Heathrow

Mon 7/28

8:05 pm-4:15 pm

1 stop25h 10m

$657

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 7/7

12:00 pm-1:10 pm

1 stop20h 10m

London Heathrow

Mon 7/21

8:10 pm-12:02 pm

1 stop20h 52m

$658

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Fri 7/18

8:45 pm-5:50 pm

1 stop16h 05m

London Gatwick

Wed 7/23

6:35 pm-4:15 pm

1 stop26h 40m

$659

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 8/24

10:05 pm-9:40 pm

1 stop18h 35m

London Heathrow

Sun 10/19

10:20 am-7:59 pm

1 stop14h 39m

$659

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 7/25

10:40 pm-11:05 am

Nonstop7h 25m

London Heathrow

Fri 8/1

2:25 pm-5:30 pm

Nonstop8h 05m

$661

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Thu 9/4

5:50 pm-8:25 pm

2 stops21h 35m

London Gatwick

Tue 9/9

4:25 pm-3:20 pm

1 stop27h 55m

$663

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 7/14

10:40 pm-11:05 am

Nonstop7h 25m

London Heathrow

Mon 7/21

4:25 pm-10:59 am

1 stop23h 34m

$663

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 60 results

...

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

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

Airports

IAD

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

LHR

For a quick city transfer, take the Heathrow Express to Paddington Station. It's the fastest way to reach central London.

Our travel experts

Ramsey Qubein

Expert on LHR and IAD

Best time to book a flight from Dulles Intl to London

Have a flexible travel schedule? Discover the best time to fly to London 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

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

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to London, you should look to book at least 81 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?

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $661). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $1,108). 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 LON?

When flying from Washington, D.C. Dulles Intl Airport to London, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 15% versus a flight at noon.

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

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

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

The most flights from IAD to LON are scheduled on a Monday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).

Rainfall in London by month

In terms of precipitation, rainfall in London 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 when rainfall is around 1.6 in.

Temperature in London by month

If weather is an important factor for your trip to London, 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).

Reviews of airlines servicing London

See what other customers who have flown with Delta, Porter Airlines and KLM from Washington, D.C. to London have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,950 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,950 reviews

Delta

8.0

Very good

7,950 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Porter Airlines

8.0

Very good

288 reviews

Delta

8.0

Very good

7,950 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,358 reviews

Delta

8.0

Very good

7,950 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Austrian Airlines

7.6

Good

802 reviews

Delta

8.0

Very good

7,950 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

SWISS

7.5

Good

1,623 reviews

Delta

8.0

Very good

7,950 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London round-trip?
According to our current data, Icelandair ($656), Delta ($658), and SWISS ($659) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to London. Icelandair is priced at 11% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London one-way?
The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as $302. However, be on the lookout for offers from TAP AIR PORTUGAL and Virgin Atlantic, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to London for a low price.
What are the most popular routes from Washington, D.C. Dulles Intl Airport to London?
When deciding which route to take from Washington, D.C. Dulles Intl Airport to London consider Washington, D.C. Dulles Intl - London Heathrow, Washington, D.C. Dulles Intl - London Gatwick or Washington, D.C. Dulles Intl - London City as they are the most popular.
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to London on time: Aer Lingus (73%), Finnair (73%), KLM (72%).
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London?
While on average a flight from Washington, D.C. Dulles Intl Airport to London is generally $2,488, our data shows the cheapest flight currently is $376. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $426 for that flight.
Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to London?
Of the flights from Washington, D.C. Dulles Intl Airport to London that have layovers, most of them stop in Reykjavik.
What are some popular things to do or see while on a layover in Reykjavik?
Reykjavik travelers tend to visit Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool more than anywhere else. Hallgrímskirkja, Harpa and Laugardalslaug Geothermal Pool are located about 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl if you are interested in checking them out. Those landing in Reykjavik looking to spend some time exploring during their layover can rent a car for about $66 per day.
Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to London flights?
The least popular layover on flights from Washington, D.C. Dulles Intl Airport to London is Dublin.
Can I find deals for flights from Dulles Intl to London that include hotel bookings?
Yes. In addition to deals on Dulles Intl to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to London.
Can I find deals for business class flights from Dulles Intl to London?
Yes. Cheapflights offers flight deals from Dulles Intl to London 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?
Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $661). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $1,108). 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.

See more FAQs

Hayes

Hounslow

Thornton Heath

Luton

Canterbury

Harrow

Dover

Gatwick

Orpington

Watford

Croydon

Folkestone

Borehamwood

Sutton

Aylesbury

Chelmsford

Brentwood

Chichester

Wembley

Arundel

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Dulles Intl to London

Airline	Cheapest	Average	Flexibility	On-time
PLAY	Cheapest$379	Average$506	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$394	Average$597	FlexibilityNo cancel fee	On-time77%
Icelandair	Cheapest$435	Average$622	FlexibilityNo cancel fee	On-time76%
TAP AIR PORTUGAL	Cheapest$486	Average$758	FlexibilityNo cancel fee	On-timeN/A
Air Canada	Cheapest$549	Average$800	FlexibilityNo cancel fee	On-time67%
Lufthansa	Cheapest$552	Average$868	FlexibilityNo cancel fee	On-time76%
Aer Lingus	Cheapest$555	Average$758	FlexibilityNo cancel fee	On-timeN/A
SWISS	Cheapest$572	Average$789	FlexibilityNo cancel fee	On-time79%
Delta	Cheapest$572	Average$828	FlexibilityNo cancel fee	On-timeN/A
Iberia	Cheapest$573	Average$698	FlexibilityNo cancel fee	On-time77%

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$298+ Cheap flights from Dulles Intl (IAD) to London (LON)

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 10/20. 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 are usually found in January or October, booked 81 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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Cheapest flights from Dulles Intl to LondonExplore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

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Best time to book a flight from Dulles Intl to London

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to London. Price data was last updated on June 9, 2025.

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Find hourly flight availability from Dulles Intl to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to London. Price data was last updated on December 16, 2024.

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

Explore weekly flight availability from Dulles Intl to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 12, 2025.

Rainfall in London by month

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Temperature in London by month

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Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated June 12, 2025.

See what other customers who have flown with Delta, Porter Airlines and KLM from Washington, D.C. to London have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to London. 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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Top 10 airlines flying from Dulles Intl to London

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Cheapest flights from Dulles Intl to London
Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.