Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £197
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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in September or October, booked 45 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday
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 11 luglio 2025.
Round-trip from | £400 |
---|---|
One-way from | £197 |
Popular in | June |
Cheapest in | September |
Average price | £656 |
Good round-trip deal | £451 or less |
Good one-way deal | £299 or less |
Find flight deals from Dulles Intl to Heathrow
Cheapest flights from Dulles Intl to HeathrowExplore 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 11 luglio 2025.
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 11 luglio 2025.
Cheapflights Fare Finder
Customise 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 858,174 searches. Data last updated 11 luglio 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
Fly to
Route
Depart
Return
Price
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
mer 17/9
17:50-06:20
Nonstop7h 30m
London Heathrow
mar 23/9
08:40-15:35
1 stop11h 55m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
mer 8/10
17:50-06:15
Nonstop7h 25m
London Heathrow
lun 13/10
17:00-20:15
Nonstop8h 15m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
dom 31/8
18:04-12:45
1 stop13h 41m
London Heathrow
mer 15/10
20:00-15:00
1 stop24h 00m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
ven 19/9
18:40-06:55
Nonstop7h 15m
London Heathrow
mer 24/9
12:10-16:15
1 stop33h 05m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
lun 1/9
20:45-17:50
1 stop16h 05m
London Heathrow
mer 10/9
07:00-16:15
2 stops14h 15m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
mer 23/7
20:33-11:25
1 stop9h 52m
London Heathrow
ven 1/8
11:30-19:15
1 stop12h 45m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
mar 19/8
22:05-16:25
2 stops13h 20m
London Heathrow
mar 26/8
10:20-19:59
1 stop14h 39m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
mer 3/9
22:20-16:40
2 stops13h 20m
London Heathrow
gio 11/9
06:30-13:30
1 stop12h 00m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
ven 22/8
20:30-11:55
1 stop10h 25m
London Heathrow
dom 31/8
13:05-22:10
1 stop14h 05m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
gio 7/8
18:35-06:55
Nonstop7h 20m
London Heathrow
gio 14/8
07:45-13:30
1 stop10h 45m
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.
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 return flight from Dulles Intl to Heathrow. Price data was last updated on 27 June 2025.
The price you pay for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 45 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £112). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in August is currently the most expensive (average of £164). 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 11 luglio 2025.
When flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 6% versus a flight in the morning.
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 11 luglio 2025.
The most flights from IAD to LHR are scheduled on a Wednesday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).
How much does it cost for a return flight 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 11 luglio 2025.
Check out reviews from past customers who have flown with Delta, SWISS, andUnited Airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
Food
Comfort
Crew
Overall
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Boarding
Food
Comfort
Crew
Overall
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Boarding
Food
Comfort
Crew
Overall
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Boarding
Food
Comfort
Crew
Overall
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Boarding
Food
Comfort
Crew
Overall
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Boarding
Food
Comfort
Crew
Overall
Entertainment
Reviews
Kim,May 2025
PIH - SLC
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.
Travelling to a place near Washington, D.C. Dulles Intl Airport?
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Alternative routes for Dulles Intl to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.
Top 8 airlines flying from Dulles Intl to Heathrow
Discover the top 8 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 858,174 searches. Data last updated 11 luglio 2025.
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How does Cheapflights help users find flights from Dulles Intl to Heathrow?
Deals for Dulles Intl to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Heathrow?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Dulles Intl to Heathrow.
Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?
Need flexible booking options for your flight to Heathrow from Dulles Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.
Can Cheapflights notify me if prices for flights from Dulles Intl to Heathrow become cheaper?
Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!