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Dulles Intl

$537+ Cheap flights from London (LON) to Dulles Intl (IAD)

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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
LON — IAD
Jun 20 — Jun 271
Sat 6/20
Sat 6/27
1 adult, Economy
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Find cheap flights from London to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from London to Washington, D.C. Dulles Intl are usually found in September or March, booked 86 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

Cheap flight deals from London to Dulles Intl

Cheapest flights from London to Dulles Intl
Explore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 21, 2026.

This TravelUp deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:00 pm
LGW
-
IAD
1 stop33h 35m
TAP AIR PORTUGAL
Sun 11/810:30 pm
IAD
-
LGW
1 stop12h 15m
TAP AIR PORTUGAL
Deal found 5/18$622
This Kiwi.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/52:00 pm
LGW
-
IAD
1 stop33h 32m
Multiple Airlines
Tue 7/141:36 pm
IAD
-
LGW
1 stop15h 24m
Multiple Airlines
Deal found 5/17$627
This Booking.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:00 am
LHR
-
IAD
1 stop19h 35m
TAP AIR PORTUGAL
Sun 11/810:30 pm
IAD
-
LHR
1 stop14h 00m
TAP AIR PORTUGAL
Deal found 5/18$628
This deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/312:00 pm
LHR
-
IAD
Nonstop8h 25m
British Airways
Mon 8/175:45 pm
IAD
-
LHR
Nonstop7h 35m
British Airways
Deal found 5/18$630
This Booking.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/183:40 pm
LGW
-
IAD
1 stop11h 35m
Icelandair
Mon 9/218:30 pm
IAD
-
LGW
1 stop13h 10m
Icelandair
Deal found 5/17$631
This oojo deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/153:40 pm
LGW
-
IAD
1 stop11h 35m
Icelandair
Fri 9/2511:20 pm
IAD
-
LGW
1 stop10h 20m
Icelandair
Deal found 5/18$632
This oojo deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/21:05 pm
LHR
-
IAD
1 stop11h 15m
Icelandair
Wed 9/98:30 pm
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 5/18$633
This Kiwi.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/411:55 am
LGW
-
IAD
1 stop11h 35m
Icelandair
Sat 11/77:40 pm
IAD
-
LGW
1 stop10h 15m
Icelandair
Deal found 5/18$633
This The Travel House deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/271:05 pm
LHR
-
IAD
1 stop11h 15m
Icelandair
Wed 9/98:30 pm
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 5/17$634
This Icelandair deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/31:05 pm
LHR
-
IAD
1 stop11h 15m
Icelandair
Tue 10/138:30 pm
IAD
-
LHR
1 stop18h 50m
Icelandair
Deal found 5/18$635
This Icelandair deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/43:40 pm
LGW
-
IAD
1 stop32h 40m
Icelandair
Fri 10/168:30 pm
IAD
-
LGW
1 stop13h 10m
Icelandair
Deal found 5/18$635
This Icelandair deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/49:25 pm
LHR
-
IAD
1 stop26h 55m
Icelandair
Tue 10/138:30 pm
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 5/18$636

Find flight deals from London to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$622
(TravelUp)

One-way from

$537
(Austrian Airlines)

Popular in

July

Cheapest in

September

Average price

$765

Good round-trip deal

$775 or less

Good one-way deal

$752 or less
Provider with most accurate pricing for London (LON)-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Washington, D.C. Dulles Intl flights.
Search Deals
From London (LON) to Washington, D.C. Dulles Intl
Search Deals
One-way flight from London (LON) to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($64 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from London (LON) to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from London (LON) to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 21, 2026.
Use the filters below to find and compare flights from London to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 11/13

6:40 pm-4:40 pm

1 stop27h 00m

Washington, D.C. Dulles Intl

Thu 12/3

8:30 pm-1:00 pm

1 stop11h 30m

$678

LondonWashington, D.C.

LTN - IAD

LTNIAD

London Luton

Mon 6/8

8:15 am-3:45 pm

1 stop12h 30m

Washington, D.C. Dulles Intl

Mon 6/15

5:15 pm-9:15 am

1 stop11h 00m

$690

LondonWashington, D.C.

LTN - IAD

LTNIAD

London Luton

Thu 6/4

9:25 am-3:45 pm

1 stop11h 20m

Washington, D.C. Dulles Intl

Mon 6/8

9:00 pm-12:45 pm

1 stop10h 45m

$705

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 7/16

10:25 am-7:35 pm

1 stop14h 10m

Washington, D.C. Dulles Intl

Thu 7/30

6:15 pm-9:25 am

1 stop10h 10m

$712
Quickest round-trip

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 9/30

12:15 pm-3:30 pm

Nonstop8h 15m

Washington, D.C. Dulles Intl

Wed 10/7

6:35 pm-6:55 am

Nonstop7h 20m

$719

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 9/7

4:40 pm-8:00 pm

Nonstop8h 20m

Washington, D.C. Dulles Intl

Mon 9/21

10:05 pm-10:40 am

Nonstop7h 35m

$719

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 11/12

8:40 am-3:45 pm

1 stop12h 05m

Washington, D.C. Dulles Intl

Mon 11/30

6:50 pm-10:30 am

1 stop10h 40m

$727

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 8/14

7:50 pm-11:49 am

1 stop20h 59m

Washington, D.C. Dulles Intl

Sat 9/5

10:55 pm-11:20 am

Nonstop7h 25m

$729

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 10/8

10:25 am-11:02 pm

2 stops17h 37m

Washington, D.C. Dulles Intl

Mon 10/12

6:15 pm-4:00 pm

1 stop16h 45m

$731

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 8/24

8:05 pm-3:30 pm

1 stop24h 25m

Washington, D.C. Dulles Intl

Tue 9/22

8:20 pm-4:25 pm

1 stop15h 05m

$735

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/20

Showing 1-10 of 60 resultsSorted by cheapest first
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2
3
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6

Compare providers for flights from London to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to Dulles Intl in May.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
business-class.comPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from London 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 London to Washington, D.C. Dulles Intl Airport

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

Currently, January is the cheapest month in which you can book a flight from London to Washington, D.C. Dulles Intl Airport (average of $432). Flying from London to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $1,258). 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 LON to IAD?

Find hourly flight availability from London to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 21, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Washington, D.C. Dulles Intl Airport as you normally would.

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

Explore weekly flight availability from London to Dulles Intl. 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 May 21, 2026.

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

How much does it cost to fly round-trip from London to Washington, D.C. Dulles Intl Airport?

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

Share of 1-stop round-trip flights from London to Washington, D.C. Dulles Intl Airport chosen by Cheapflights users in the past 12 months, using the same layover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 50% of 1-stop itineraries from London to Washington, D.C. Dulles Intl Airport on Cheapflights.

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

Average round-trip fare for 1-stop flights from London to Washington, D.C. Dulles Intl Airport, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Lisbon (LIS) is the most affordable 1-stop option, with an average round-trip price of $509.

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

Shortest average travel time for 1-stop one-way flights from London to Washington, D.C. Dulles Intl Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Reykjavik (KEF) have the shortest average one-way travel time for 1-stop routes: 11h 15m.

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

Average layover duration for 1-stop one-way flights from London to Washington, D.C. Dulles Intl Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Lisbon (LIS) offer the fastest connection on this route, with an average layover time of 1h 23m.

How often are flights from London to Washington, D.C. delayed?

About 18% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 127 minutes.

What is the most punctual flight time for London to Washington, D.C. flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to Washington, D.C. flights?

Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 11% of flights being delayed.

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

The price you pay for your flight from London to Washington, D.C. Dulles Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 63 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your London to Washington, D.C. Dulles Intl Airport trip
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on LHR and IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated May 21, 2026.
Read reviews from past customers who have flown Austrian Airlines,Virgin Atlantic, andUnited Airlines from London to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Austrian Airlines
7.6
Good
919 reviews

Comfort

7.3

Crew

8.1

Boarding

7.6

Entertainment

6.8

Food

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
Austrian Airlines
7.6
Good
919 reviews
Austrian Airlines
7.6
Good
919 reviews

Comfort

7.3

Crew

8.1

Boarding

7.6

Entertainment

6.8

Food

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
Virgin Atlantic
7.5
Good
689 reviews
Austrian Airlines
7.6
Good
919 reviews

Comfort

7.3

Crew

8.1

Boarding

7.6

Entertainment

6.8

Food

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
United Airlines
7.4
Good
9,750 reviews
Austrian Airlines
7.6
Good
919 reviews

Comfort

7.3

Crew

8.1

Boarding

7.6

Entertainment

6.8

Food

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
Icelandair
7.0
Good
657 reviews
Austrian Airlines
7.6
Good
919 reviews

Comfort

7.3

Crew

8.1

Boarding

7.6

Entertainment

6.8

Food

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
British Airways
6.7
Okay
7,991 reviews
Austrian Airlines
7.6
Good
919 reviews

Comfort

7.3

Crew

8.1

Boarding

7.6

Entertainment

6.8

Food

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.

Related info for your journey

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

  • How long is the flight from London to Washington, D.C. Dulles Intl Airport?

    Airlines like SWISS, Delta, and Austrian Airlines fly from London to Washington, D.C. Dulles Intl Airport in about 8h 15m. The time it takes to get you to your destination can typically vary by up to 18h 45m. The distance from London to Washington, D.C. Dulles Intl Airport is about 3664 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London to Washington, D.C. Dulles Intl Airport round-trip?

    Delta, at $320, was found to be the cheapest airline from London to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include Icelandair and TAP AIR PORTUGAL. Delta is 56% cheaper than the average price of flights available within the next 90 days to this destination.

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

    One-way options have recently been found by users for as low as $475 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Aer Lingus from $491 and Icelandair from $511 one-way.

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

    While some choose either London Gatwick - Washington, D.C. Dulles Intl or London Stansted - Washington, D.C. Dulles Intl, London Heathrow - Washington, D.C. Dulles Intl is the most popular route from London to Washington, D.C. Dulles Intl Airport.

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

    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 London to Washington, D.C. Dulles Intl Airport on time: Air Canada (88%), Austrian Airlines (88%), Copa Airlines (88%).

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

    Looking at all options, your cheapest flight can be booked for $658. While the most popular route (London Heathrow - Washington, D.C. Dulles Intl) can be booked for $161 on average, our data indicates $1,523 when flying from London to Washington, D.C. Dulles Intl Airport.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London to Dulles Intl 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 London to Washington, D.C. Dulles Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from London to Washington, D.C. Dulles Intl Airport (average of $432). Flying from London to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $1,258). 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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Tysons
Owings Mills
Springfield
Arlington
Herndon
Rockville
Hyattsville
Manassas
Fredericksburg
Hanover
Chantilly
Laurel
Falls Church
Waldorf
Silver Spring
Largo
Clinton
Reston
Hunt Valley

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 10 airlines flying from London to Dulles Intl

Discover the top 10 airlines that operate flights from London to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$320Average$842FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$466Average$672FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$473Average$730FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$523Average$742FlexibilityNo cancel feeOn-time76%
Austrian AirlinesCheapest$534Average$743FlexibilityNo cancel feeOn-time78%
American AirlinesCheapest$559Average$720FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$567Average$808FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$571Average$730FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$635Average$663FlexibilityNo cancel feeOn-time67%
Aer LingusCheapest$658Average$804FlexibilityNo cancel feeOn-timeN/A

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