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$260+ 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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
jul. 23 — jul. 301
mié. 7/23
mié. 7/30
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in September or October, booked 63 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap 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 julio 18, 2025.

Round-trip from

$533
(Cheapflightsfares)

One-way from

$260
(Mytrip)

Popular in

June

Cheapest in

September

Average price

$855

Good round-trip deal

$583 or less

Good one-way deal

$417 or less
From Washington, D.C. Dulles Intl to London Heathrow
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One-way flight from Washington, D.C. Dulles Intl to London Heathrow
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Highest demand for flights based on searches. 14% potential increase in price ($128 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London Heathrow.
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Find 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 julio 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/3110:40 pmIAD - LHR
Nonstop7h 25mBritish Airways
mar. 9/912:45 pmLHR - IAD
Nonstop8h 15mBritish Airways
Deal found 7/17$532
This Booking.com deal was found by Cheapflights users on 7/17. 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.
jue. 8/2110:20 pmIAD - LHR
1 stop19h 35mTAP AIR PORTUGAL
mar. 9/26:45 pmLHR - IAD
1 stop25h 35mTAP AIR PORTUGAL
Deal found 7/17$535
This Delta deal was found by Cheapflights users on 7/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/209:20 pmIAD - LHR
1 stop11h 25mDelta
jue. 8/2812:35 pmLHR - IAD
Nonstop8h 25mDelta
Deal found 7/16$536
This Mytrip deal was found by Cheapflights users on 7/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/1210:20 amIAD - LHR
2 stops15h 10mMultiple Airlines
lun. 9/16:00 amLHR - IAD
1 stop15h 15mMultiple Airlines
Deal found 7/17$537
This Iberia deal was found by Cheapflights users on 7/16. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/3110:40 pmIAD - LHR
Nonstop7h 25mIberia
lun. 10/207:10 pmLHR - IAD
1 stop24h 50mIberia
Deal found 7/16$539
This Virgin Atlantic deal was found by Cheapflights users on 7/16. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/311:00 pmIAD - LHR
1 stop14h 55mVirgin Atlantic
mar. 9/99:00 amLHR - IAD
1 stop15h 15mVirgin Atlantic
Deal found 7/16$546
This oojo deal was found by Cheapflights users on 7/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/108:30 pmIAD - LHR
1 stop17h 00mScandinavian Airlines
dom. 11/236:40 amLHR - IAD
2 stops39h 35mScandinavian Airlines
Deal found 7/17$547
This SWISS deal was found by Cheapflights users on 7/17. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/318:45 pmIAD - LHR
1 stop30h 10mSWISS
jue. 9/118:40 amLHR - IAD
1 stop12h 35mSWISS
Deal found 7/17$550
This United Airlines deal was found by Cheapflights users on 7/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/16:40 pmIAD - LHR
Nonstop7h 15mUnited Airlines
dom. 9/149:00 amLHR - IAD
1 stop15h 25mUnited Airlines
Deal found 7/17$551
This Austrian Airlines deal was found by Cheapflights users on 7/17. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/196:00 pmIAD - LHR
1 stop15h 05mAustrian Airlines
vie. 11/286:00 amLHR - IAD
1 stop13h 40mAustrian Airlines
Deal found 7/17$562
This Air Canada deal was found by Cheapflights users on 7/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/279:35 amIAD - LHR
1 stop15h 55mAir Canada
mié. 9/106:50 amLHR - IAD
2 stops14h 28mAir Canada
Deal found 7/17$565
This FlightHub deal was found by Cheapflights users on 7/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/1011:15 pmIAD - LHR
1 stop16h 05mIcelandair
lun. 10/139:25 pmLHR - IAD
1 stop26h 55mIcelandair
Deal found 7/17$574

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 julio 18, 2025.
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

Dulles Intl

Fly to

Heathrow

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

dom. 8/31

10:40 pm-11:05 am

Nonstop7h 25m

London Heathrow

mar. 9/9

12:45 pm-4:00 pm

Nonstop8h 15m

$532

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

jue. 8/21

10:20 pm-10:55 pm

1 stop19h 35m

London Heathrow

mar. 9/2

6:45 pm-3:20 pm

1 stop25h 35m

$535

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

mié. 8/20

9:20 pm-1:45 pm

1 stop11h 25m

London Heathrow

jue. 8/28

12:35 pm-4:00 pm

Nonstop8h 25m

$536

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

mar. 8/12

10:20 am-6:30 am

2 stops15h 10m

London Heathrow

lun. 9/1

6:00 am-4:15 pm

1 stop15h 15m

$537

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

dom. 8/31

10:40 pm-11:05 am

Nonstop7h 25m

London Heathrow

mié. 10/15

11:30 am-3:00 pm

1 stop32h 30m

$539

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

dom. 8/31

1:00 pm-8:55 am

1 stop14h 55m

London Heathrow

mar. 9/9

9:00 am-7:15 pm

1 stop15h 15m

$546

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

dom. 8/31

8:45 pm-7:55 am

1 stop30h 10m

London Heathrow

mar. 9/9

8:45 am-4:15 pm

1 stop12h 30m

$550

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

lun. 9/1

6:40 pm-6:55 am

Nonstop7h 15m

London Heathrow

dom. 9/14

9:00 am-7:25 pm

1 stop15h 25m

$551

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

mié. 10/8

10:05 pm-6:30 pm

1 stop15h 25m

London Heathrow

lun. 10/13

5:30 pm-7:59 pm

2 stops31h 29m

$557

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

mié. 8/27

9:35 am-6:30 am

1 stop15h 55m

London Heathrow

mié. 9/10

6:50 am-4:18 pm

2 stops14h 28m

$565

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/17

Showing 1-10 of 15 results
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The best insider tips for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to London Heathrow Airport trip
Airports
IAD

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

Read more about IADby Ramsey Qubein
LHR

Take the Heathrow Express for the fastest route to central London. It connects to Paddington Station, offering further transit options.

Read more about LHRby Ramsey Qubein
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR and IAD

Ramsey Qubein

Ramsey Qubein

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

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?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Heathrow. Price data was last updated on July 11, 2025.

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 63 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, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of $661). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,095). 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 julio 18, 2025.

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 10% on the cost of your flight, compared to a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Heathrow. Price data was last updated on July 13, 2025.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight should consider departing on Wednesday mornings when fares are most often at their lowest. Thursday mornings 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 Heathrow Airport

Explore weekly flight availability from Dulles Intl to Heathrow. 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 julio 18, 2025.

The most flights from IAD to LHR are scheduled on a Wednesday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 on average).

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

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 julio 18, 2025.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, such as Delta, KLM, and Austrian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,959 reviews

Crew

8.5

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,959 reviews
Delta
8.0
Very good
7,959 reviews

Crew

8.5

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,374 reviews
Delta
8.0
Very good
7,959 reviews

Crew

8.5

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
814 reviews
Delta
8.0
Very good
7,959 reviews

Crew

8.5

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,864 reviews
Delta
8.0
Very good
7,959 reviews

Crew

8.5

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very good
7,959 reviews

Crew

8.5

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

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

Related info for your journey

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.

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

    Austrian Airlines, at $533, 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 British Airways and Iberia. Austrian Airlines is priced at 29% lower than the current average price of a flight leaving 3 months from now.

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

    Consider Aer Lingus (63%), Finnair (63%) or KLM (63%) 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 $2,850 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is $276 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at $425.

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

    Most of the time, Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights that have layovers will stop in Reykjavik.

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

    Hallgrímskirkja, Laugardalslaug Geothermal Pool, and Harpa are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Hallgrímskirkja, Laugardalslaug Geothermal Pool and Harpa are located about 23.2 mi, 24.6 mi, and 23.3 mi, respectively from Reykjavik Keflavik Intl if you are interested in checking them out. Travelers can book a car rental at Reykjavik Keflavik Intl for about $80 per day to make their sightseeing more efficient.

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

    Flights departing from Washington, D.C. Dulles Intl Airport and landing in London Heathrow Airport layover in Dublin least frequently.

  • 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, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of $661). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,095). 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
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Borehamwood
Broadway
Aylesbury
Chelmsford
Folkestone
Chichester
Southend-on-Sea
Swindon

Browse thousands of different options on Cheapflights for your next trip

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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 julio 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest$379Average$539FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$409Average$598FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$433Average$568FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$486Average$690FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$549Average$759FlexibilityNo cancel feeOn-time67%
Aer LingusCheapest$557Average$768FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$572Average$806FlexibilityNo cancel feeOn-time79%
DeltaCheapest$572Average$822FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$574Average$695FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$575Average$803FlexibilityNo cancel feeOn-time71%

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