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$345+ 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 3/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LON
Apr 17 — Apr 241
Fri 4/17
Fri 4/24
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London are usually found in September or February, booked 74 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap 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 March 18, 2026.

This Gotogate deal was found by Cheapflights users on 3/13. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2710:35 pm
IAD
-
LGW
2 stops16h 50m
TAP AIR PORTUGAL
Mon 5/44:25 pm
LGW
-
IAD
1 stop27h 45m
TAP AIR PORTUGAL
Deal found 3/13$606
This CrystalTravel deal was found by Cheapflights users on 3/13. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/138:20 pm
IAD
-
LHR
2 stops15h 05m
Scandinavian Airlines
Fri 4/2410:20 am
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 3/13$606
This oojo deal was found by Cheapflights users on 3/13. 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.
Mon 4/2710:35 pm
IAD
-
LGW
1 stop12h 00m
TAP AIR PORTUGAL
Wed 5/64:25 pm
LGW
-
IAD
1 stop27h 45m
TAP AIR PORTUGAL
Deal found 3/13$607
This oojo deal was found by Cheapflights users on 3/15. 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 4/215:05 pm
IAD
-
LHR
1 stop19h 40m
TAP AIR PORTUGAL
Mon 5/47:50 pm
LHR
-
IAD
1 stop24h 20m
TAP AIR PORTUGAL
Deal found 3/15$607
This Booking.com deal was found by Cheapflights users on 3/13. 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.
Sun 4/1910:35 pm
IAD
-
LGW
1 stop30h 10m
TAP AIR PORTUGAL
Mon 4/279:15 pm
LGW
-
IAD
2 stops22h 55m
TAP AIR PORTUGAL
Deal found 3/13$608
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Sat 4/188:20 pm
IAD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Wed 4/296:40 am
LHR
-
IAD
1 stop15h 20m
Scandinavian Airlines
Deal found 3/13$608
This Mytrip deal was found by Cheapflights users on 3/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/2610:35 pm
IAD
-
LGW
2 stops19h 00m
Multiple Airlines
Wed 5/66:00 am
LGW
-
IAD
2 stops19h 35m
Multiple Airlines
Deal found 3/14$609
This FlightHub deal was found by Cheapflights users on 3/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/188:20 pm
IAD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Thu 4/236:40 am
LHR
-
IAD
1 stop15h 20m
Scandinavian Airlines
Deal found 3/13$609
This Mytrip deal was found by Cheapflights users on 3/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/810:35 pm
IAD
-
LHR
1 stop19h 20m
TAP AIR PORTUGAL
Mon 4/137:50 pm
LHR
-
IAD
1 stop24h 20m
TAP AIR PORTUGAL
Deal found 3/14$611
This CheapOair deal was found by Cheapflights users on 3/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1910:35 pm
IAD
-
LHR
1 stop30h 45m
TAP AIR PORTUGAL
Tue 4/286:00 am
LHR
-
IAD
1 stop14h 10m
TAP AIR PORTUGAL
Deal found 3/14$612
This oojo deal was found by Cheapflights users on 3/13. 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 4/285:05 pm
IAD
-
LGW
2 stops13h 15m
TAP AIR PORTUGAL
Mon 5/114:25 pm
LGW
-
IAD
1 stop27h 45m
TAP AIR PORTUGAL
Deal found 3/13$613
This Gotogate deal was found by Cheapflights users on 3/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/610:35 pm
IAD
-
LHR
1 stop30h 45m
TAP AIR PORTUGAL
Wed 4/1511:20 am
LHR
-
IAD
1 stop14h 15m
TAP AIR PORTUGAL
Deal found 3/14$613

Find flight deals from Dulles Intl to London

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to London (LON). 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 March 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$606
(Gotogate)

One-way from

$345
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$687

Good round-trip deal

$723 or less

Good one-way deal

$418 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-London (LON) flights.
Search Deals
From Washington, D.C. Dulles Intl to London (LON)
Search Deals
One-way flight from Washington, D.C. Dulles Intl to London (LON)
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($109 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London (LON).
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to London 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 March 18, 2026.
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

Cheapest round-trip

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Thu 5/7

5:15 pm-9:30 am

1 stop11h 15m

London Luton

Sun 5/10

9:00 am-3:45 pm

1 stop11h 45m

$651

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Mon 4/27

9:45 pm-4:50 pm

1 stop38h 05m

London Stansted

Thu 5/7

5:35 pm-11:35 am

1 stop23h 00m

$696

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 4/20

8:30 pm-2:40 pm

1 stop13h 10m

London Gatwick

Wed 4/29

3:40 pm-7:20 pm

1 stop32h 40m

$712

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Thu 4/23

1:20 pm-9:55 am

1 stop15h 35m

London Stansted

Wed 6/10

6:55 am-7:50 pm

1 stop17h 55m

$735

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 5/11

10:55 pm-11:20 am

Nonstop7h 25m

London Heathrow

Wed 5/20

6:30 am-3:35 pm

1 stop14h 05m

$750

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 8/17

6:30 pm-6:55 am

Nonstop7h 25m

London Heathrow

Mon 8/31

12:10 pm-4:45 pm

1 stop33h 35m

$752

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 4/1

6:00 am-7:10 am

1 stop20h 10m

London Heathrow

Wed 4/8

11:45 am-12:27 am

2 stops17h 42m

$766

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Tue 3/31

6:15 pm-9:25 am

1 stop10h 10m

London Gatwick

Wed 4/8

10:25 am-8:46 pm

2 stops15h 21m

$773
Quickest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/12

6:30 pm-6:55 am

Nonstop7h 25m

London Heathrow

Wed 8/19

12:15 pm-3:30 pm

Nonstop8h 15m

$780

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Tue 5/12

5:40 pm-8:50 am

1 stop10h 10m

London City

Tue 5/19

10:00 am-3:35 pm

1 stop10h 35m

$784

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Compare providers for flights from Dulles Intl to London

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 Dulles Intl to London in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
JetabroadPrice 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 Washington, D.C. Dulles Intl Airport-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-London 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 Washington, D.C. Dulles Intl Airport-London 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 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?

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 March 13, 2026.

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 74 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, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $363). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $726). 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?

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 March 18, 2026.

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 50% versus a flight at noon.

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 March 18, 2026.

The most flights from IAD to LON are scheduled on a Tuesday (26 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 on average).

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

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

Reykjavik (KEF) – chosen by Cheapflights users on 63% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to London on Cheapflights.

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

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

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $538.

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

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

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 9h 56m.

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

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

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

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

About 20% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 164 minutes.

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

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

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

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

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

Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 15% of flights being delayed.

The best insider tips for Washington, D.C. Dulles Intl Airport to London 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 Washington, D.C. Dulles Intl Airport to London trip
Our travel experts
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 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 March 18, 2026.
Get a feel of what it's like to fly with United Airlines,American Airlines, andIcelandair from Washington, D.C. Dulles Intl Airport to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,434 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,434 reviews
United Airlines
7.4
Good
9,434 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.1
Good
11,469 reviews
United Airlines
7.4
Good
9,434 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Icelandair
7.1
Good
622 reviews
United Airlines
7.4
Good
9,434 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Iberia
7.0
Good
3,141 reviews
United Airlines
7.4
Good
9,434 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
British Airways
6.7
Okay
7,802 reviews
United Airlines
7.4
Good
9,434 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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.

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

    Airlines like Turkish Airlines, Icelandair, and Virgin Atlantic fly from Washington, D.C. Dulles Intl Airport to London in about 7h 25m. The time it takes to get you to your destination can typically vary by up to 30h 40m. Washington, D.C. Dulles Intl Airport and London are separated by a distance of 3664 mi. This flight may include one or multiple stops.

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

    According to our current data, TAP AIR PORTUGAL ($395), Icelandair ($398), and Scandinavian Airlines ($454) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to London. TAP AIR PORTUGAL is priced at 46% 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 $191. However, be on the lookout for offers from TAP AIR PORTUGAL and SWISS, 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 Stansted 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: KLM (90%), Air France (90%), Delta (90%).

  • 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 $2,260, our data shows the cheapest flight currently is $343. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $429 for that flight.

  • 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, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $363). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $726). 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 London?

Book flights to London if you plan to visit one of these locations
Ilford
Hounslow
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Orpington
Watford
Borehamwood
Aylesbury
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Sutton
Slough

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from Dulles Intl to London

Discover the top 10 airlines that operate flights from Dulles Intl to London. 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 March 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$395Average$549FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$398Average$618FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$454Average$596FlexibilityNo cancel feeOn-time77%
DeltaCheapest$530Average$832FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$538Average$740FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$553Average$791FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$560Average$839FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$561Average$785FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$573Average$802FlexibilityNo cancel feeOn-time71%
IberiaCheapest$576Average$735FlexibilityNo cancel feeOn-time77%

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