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$253+ 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 2/5. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LON
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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The best prices from Washington, D.C. Dulles Intl to London are usually found in January or October, booked 85 days in advance, depart on a Wednesday or Monday and return on a Thursday

Cheap 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 January 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$524
(FlightHub)

One-way from

$253
(Flightnetwork)

Popular in

June

Cheapest in

January

Average price

$615

Good round-trip deal

$689 or less

Good one-way deal

$440 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-London (LON) flights.
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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. 18% potential increase in price ($168 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in January 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 January 21, 2025.

This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Mon 1/275:10 pmIAD - STN
1 stop9h 40mMultiple Airlines
Tue 2/48:30 amSTN - IAD
1 stop12h 10mMultiple Airlines
Deal found 1/20$522
This Icelandair deal was found by Cheapflights users on 1/20. 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 3/238:40 pmIAD - LGW
1 stop10h 15mIcelandair
Sat 4/263:40 pmLGW - IAD
1 stop32h 40mIcelandair
Deal found 1/20$525
This Icelandair deal was found by Cheapflights users on 1/21. 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.
Thu 5/158:30 pmIAD - LHR
1 stop10h 25mIcelandair
Mon 5/191:05 pmLHR - IAD
1 stop11h 15mIcelandair
Deal found 1/21$525
This oojo deal was found by Cheapflights users on 1/21. 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.
Sun 2/2310:30 pmIAD - LHR
1 stop19h 10mTAP AIR PORTUGAL
Wed 3/58:15 amLHR - IAD
1 stop17h 45mTAP AIR PORTUGAL
Deal found 1/21$530
This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
Mon 3/35:10 pmIAD - LGW
1 stop11h 05mMultiple Airlines
Wed 3/1211:15 amLGW - IAD
1 stop13h 30mMultiple Airlines
Deal found 1/19$532
This oojo deal was found by Cheapflights users on 1/21. 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.
Sun 5/1110:20 pmIAD - LGW
1 stop11h 50mTAP AIR PORTUGAL
Thu 5/222:50 pmLGW - IAD
1 stop30h 30mTAP AIR PORTUGAL
Deal found 1/21$535
This Ticket deal was found by Cheapflights users on 1/21. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/25:10 pmIAD - LHR
2 stops16h 25mScandinavian Airlines
Tue 2/117:30 pmLHR - IAD
1 stop25h 10mScandinavian Airlines
Deal found 1/21$536
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Mon 1/275:10 pmIAD - LTN
1 stop10h 25mMultiple Airlines
Tue 2/49:00 amLTN - IAD
1 stop11h 40mMultiple Airlines
Deal found 1/20$536
This Mytrip deal was found by Cheapflights users on 1/21. 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 3/198:40 pmIAD - LHR
2 stops19h 25mMultiple Airlines
Mon 3/248:50 pmLHR - IAD
2 stops26h 35mMultiple Airlines
Deal found 1/21$563
This Cheapflightsfares deal was found by Cheapflights users on 1/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/107:00 pmIAD - LHR
Nonstop7h 15mIberia
Wed 3/1912:10 pmLHR - IAD
Nonstop8h 25mIberia
Deal found 1/21$570
This Ticket deal was found by Cheapflights users on 1/21. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/26:25 pmIAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 2/119:00 amLHR - IAD
1 stop12h 15mVirgin Atlantic
Deal found 1/21$574
This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
Mon 3/38:45 pmIAD - LCY
1 stop10h 55mMultiple Airlines
Wed 3/126:50 amLCY - IAD
1 stop13h 50mMultiple Airlines
Deal found 1/19$603

Find flights from Dulles Intl to London within your budget

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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 1/31

7:40 pm-7:30 pm

1 stop18h 50m

London Heathrow

Wed 2/12

8:40 pm-6:25 pm

1 stop26h 45m

$524

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Sun 3/23

8:40 pm-10:55 am

1 stop10h 15m

London Gatwick

Mon 4/28

3:40 pm-7:20 pm

1 stop32h 40m

$525

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Thu 2/6

7:40 pm-11:40 pm

2 stops23h 00m

London Stansted

Mon 2/10

3:55 pm-6:25 pm

2 stops31h 30m

$526

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 2/23

10:30 pm-9:35 pm

1 stop18h 05m

London Heathrow

Tue 3/11

6:00 am-3:30 pm

1 stop13h 30m

$530

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 4/23

10:40 pm-11:05 am

Nonstop7h 25m

London Heathrow

Wed 4/30

5:00 pm-8:10 pm

Nonstop8h 10m

$531

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 2/22

5:10 pm-9:20 am

1 stop11h 10m

London Heathrow

Mon 2/24

6:40 am-3:40 pm

1 stop14h 00m

$532

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 3/3

5:10 pm-9:15 am

1 stop11h 05m

London Gatwick

Wed 3/12

11:15 am-8:45 pm

1 stop13h 30m

$532

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Sun 2/2

5:10 pm-8:50 am

1 stop10h 40m

London Luton

Tue 2/11

9:00 am-3:40 pm

1 stop11h 40m

$535

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Sun 5/11

10:20 pm-3:10 pm

1 stop11h 50m

London Gatwick

Thu 5/22

2:50 pm-4:20 pm

1 stop30h 30m

$548

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 2/2

6:25 pm-6:55 am

Nonstop7h 30m

London Heathrow

Tue 2/11

11:45 am-3:45 pm

1 stop33h 00m

$581

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 59 results
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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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
FlightnetworkPrice Accuracy2 starsTrust Score*1 star
MytripPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
GurufarePrice Accuracy3 starsTrust Score*3 stars
FlightnetworkPrice Accuracy-Trust Score*3 stars

*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.

Travel insights for flights from Dulles Intl to London

Get recent, data-driven insights about flights from Dulles Intl to London including ideal travel times, pricing trends, and more.

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 January 17, 2025.

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 85 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 $1,137). 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 January 21, 2025.

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 20% versus a flight at noon.

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.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to London flight should consider departing on Monday 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

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 January 21, 2025.

The most flights from IAD to LON are scheduled on a Tuesday (26 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (13 on average).

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals 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

Plan your trip to London by taking into account the average temperature totals 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

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 January 21, 2025.
See what other customers who have flown with Icelandair, Virgin Atlantic and Delta 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
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,341 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair
7.6
Good
1,286 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Austrian Airlines
7.6
Good
786 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS
7.5
Good
1,600 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

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

    According to our current data, Icelandair ($524), TAP AIR PORTUGAL ($526), and Scandinavian Airlines ($532) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to London. Icelandair is priced at 29% 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 $253. However, be on the lookout for offers from TAP AIR PORTUGAL and Scandinavian Airlines, 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: KLM (88%), Delta (88%), Virgin Atlantic (88%).

  • 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 $1,533, our data shows the cheapest flight currently is $394. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $465 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 $51 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 $1,137). 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
Hayes
Hounslow
Thornton Heath
Harrow
Luton
Wembley
Canterbury
Gatwick
Horley
Milton Keynes
Dover
Watford
Orpington
Croydon
Borehamwood
Bromley
Folkestone
Ilford
Aylesbury
Chelmsford

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Alternative routes for Dulles Intl to London

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Heathrow flights
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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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$369Average$600FlexibilityNo cancel feeOn-time77%
PLAYCheapest$369Average$484FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$398Average$646FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$459Average$673FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$480Average$672FlexibilityNo cancel feeOn-time76%
KLMCheapest$546Average$771FlexibilityNo cancel feeOn-time75%
FinnairCheapest$551Average$718FlexibilityNo cancel feeOn-time76%
SWISSCheapest$572Average$789FlexibilityNo cancel feeOn-time79%
IberiaCheapest$583Average$739FlexibilityNo cancel feeOn-time77%
DeltaCheapest$586Average$858FlexibilityNo cancel feeOn-timeN/A
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