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Heathrow

$376+ Cheap flights from Dulles Intl (IAD) to Heathrow (LHR)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
May 28 — Jun 41
Thu 5/28
Thu 6/4
1 adult, Economy
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Find cheap flights from Dulles Intl to Heathrow with Cheapflights

1. Tell us where you want to go

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3. Compare prices and book

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

Cheap flight deals from Dulles Intl to Heathrow

Cheapest flights from Dulles Intl to Heathrow
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 28, 2026.

This KAYAK deal was found by Cheapflights users on 4/24. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/148:20 pm
IAD
-
LHR
2 stops35h 35m
Scandinavian Airlines
Thu 9/176:40 am
LHR
-
IAD
1 stop15h 20m
Scandinavian Airlines
Deal found 4/24$706
This oojo deal was found by Cheapflights users on 4/27. 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 11/168:30 pm
IAD
-
LHR
1 stop17h 00m
Scandinavian Airlines
Wed 12/29:05 pm
LHR
-
IAD
2 stops25h 10m
Scandinavian Airlines
Deal found 4/27$710
This KAYAK deal was found by Cheapflights users on 4/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:20 pm
IAD
-
LHR
2 stops31h 35m
Scandinavian Airlines
Sat 10/106:40 am
LHR
-
IAD
1 stop15h 20m
Scandinavian Airlines
Deal found 4/27$716
This Gotogate deal was found by Cheapflights users on 4/27. 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.
Wed 9/238:30 pm
IAD
-
LHR
1 stop18h 50m
Icelandair
Sat 10/31:05 pm
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 4/27$718
This CrystalTravel deal was found by Cheapflights users on 4/26. 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.
Sat 9/268:20 pm
IAD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Wed 10/710:20 am
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 4/26$722
This CrystalTravel deal was found by Cheapflights users on 4/25. 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 9/288:20 pm
IAD
-
LHR
1 stop17h 10m
Scandinavian Airlines
Mon 11/236:40 am
LHR
-
IAD
1 stop15h 35m
Scandinavian Airlines
Deal found 4/25$723
This Gotogate deal was found by Cheapflights users on 4/26. 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.
Thu 11/197:40 pm
IAD
-
LHR
1 stop10h 10m
Icelandair
Wed 11/2512:15 pm
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 4/26$725
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 9/198:20 pm
IAD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Sun 10/410:20 am
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 4/27$726
This Kiwi.com deal was found by Cheapflights users on 4/26. 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.
Thu 9/248:20 pm
IAD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Sat 10/106:40 am
LHR
-
IAD
1 stop15h 20m
Scandinavian Airlines
Deal found 4/26$727
This CrystalTravel deal was found by Cheapflights users on 4/26. 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.
Fri 9/48:30 pm
IAD
-
LHR
1 stop18h 50m
Icelandair
Tue 9/81:05 pm
LHR
-
IAD
1 stop14h 10m
Icelandair
Deal found 4/26$728
This Super.com deal was found by Cheapflights users on 4/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/88:30 pm
IAD
-
LHR
1 stop10h 25m
Icelandair
Tue 10/131:05 pm
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 4/23$729
This Gotogate deal was found by Cheapflights users on 4/23. 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 5/48:30 pm
IAD
-
LHR
1 stop10h 25m
Icelandair
Sun 10/189:25 pm
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 4/23$730

Find flight deals from Dulles Intl to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Heathrow (LHR). 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 April 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$706
(KAYAK)

One-way from

$376
(Mytrip)

Popular in

June

Cheapest in

August

Average price

$781

Good round-trip deal

$943 or less

Good one-way deal

$500 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-London Heathrow flights.
Search Deals
From Washington, D.C. Dulles Intl to London Heathrow
Search Deals
One-way flight from Washington, D.C. Dulles Intl to London Heathrow
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($149 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Heathrow 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 April 28, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 8/10

6:30 pm-6:55 am

Nonstop7h 25m

London Heathrow

Fri 8/21

6:50 am-1:30 pm

1 stop11h 40m

$852

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 5/12

10:25 pm-10:50 am

Nonstop7h 25m

London Heathrow

Tue 5/19

5:05 pm-8:20 pm

Nonstop8h 15m

$881

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 8/22

10:29 pm-8:40 pm

1 stop17h 11m

London Heathrow

Thu 9/3

12:15 pm-3:30 pm

Nonstop8h 15m

$885

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 8/20

6:30 pm-6:55 am

Nonstop7h 25m

London Heathrow

Tue 8/25

6:50 am-2:20 pm

1 stop12h 30m

$902

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 10/18

10:05 pm-10:40 am

Nonstop7h 35m

London Heathrow

Sat 10/24

12:10 pm-5:40 pm

1 stop34h 30m

$903

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 8/24

10:15 pm-10:40 am

Nonstop7h 25m

London Heathrow

Sun 8/30

12:15 pm-3:30 pm

Nonstop8h 15m

$931

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 5/18

6:25 pm-6:55 am

Nonstop7h 30m

London Heathrow

Mon 6/8

10:50 am-3:05 pm

1 stop33h 15m

$964

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 6/16

3:45 pm-6:30 am

1 stop9h 45m

London Heathrow

Fri 8/28

6:50 am-2:20 pm

1 stop12h 30m

$1,040

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 5/20

3:45 pm-6:30 am

1 stop9h 45m

London Heathrow

Fri 6/19

4:40 pm-8:00 pm

Nonstop8h 20m

$1,099
Quickest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 7/14

10:55 pm-11:20 am

Nonstop7h 25m

London Heathrow

Thu 7/23

5:55 pm-8:55 pm

Nonstop8h 00m

$1,104

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 21 resultsSorted by cheapest first
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3

Compare providers for flights from Dulles Intl to Heathrow

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 Heathrow in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
eDreamsPrice Accuracy2 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy2 starsTrust 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 Heathrow Airport 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 Heathrow Airport 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 Heathrow Airport 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 Heathrow 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 Washington, D.C. Dulles Intl Airport-London Heathrow 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 Dulles Intl to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Dulles Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, you should look to book at least 62 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of $683). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,094). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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

Find hourly flight availability from Dulles Intl to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 28, 2026.

It’s optimal to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the morning. By choosing this option you can save up to 50% on the cost of your flight, compared to a flight at noon.

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

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

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated April 28, 2026.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, such as United Airlines,Virgin Atlantic, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,675 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,675 reviews
United Airlines
7.4
Good
9,675 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Virgin Atlantic
7.4
Good
688 reviews
United Airlines
7.4
Good
9,675 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
American Airlines
7.1
Good
11,676 reviews
United Airlines
7.4
Good
9,675 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Icelandair
7.0
Good
646 reviews
United Airlines
7.4
Good
9,675 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
British Airways
6.7
Okay
7,929 reviews
United Airlines
7.4
Good
9,675 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

Related info for your journey

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

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

    There are many flights that can get you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 7h 25m. Fly via United Airlines or British Airways to get the fastest option. The distance between Washington, D.C. Dulles Intl Airport and London Heathrow Airport is about 3664 mi. Most flights are nonstop.

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

    Icelandair, at $398, was found to be the cheapest airline from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.Alternate airlines to your destination round-trip include TAP AIR PORTUGAL and Scandinavian Airlines. Icelandair is priced at 49% 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 Heathrow Airport one-way?

    One-way options have recently been found by users for as low as $202 on Icelandair. Other airlines that offer cheap prices include TAP AIR PORTUGAL from $222 and SWISS from $280 one-way.

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

    Consider United Airlines (89%), Delta (85%) or Virgin Atlantic (85%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.

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

    On average you can expect to pay $2,304 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is $370 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at $632.

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

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of $683). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,094). 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 Heathrow Airport?

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

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 Dulles Intl to Heathrow

Discover the top 10 airlines that operate flights from Dulles Intl to Heathrow. 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 April 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$398Average$582FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$411Average$550FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$454Average$710FlexibilityNo cancel feeOn-time77%
DeltaCheapest$519Average$866FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$528Average$853FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$531Average$749FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$557Average$809FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$559Average$878FlexibilityNo cancel feeOn-time69%
IberiaCheapest$561Average$770FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$561Average$785FlexibilityNo cancel feeOn-timeN/A

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