$486 Cheap Flights from London to Washington

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly from Heathrow to Washington Dulles Intl.

Amazing LHR to IAD Flight Deals

The cheapest flights to Washington Dulles Intl. found within the past 7 days were $481 round trip and $486 one way. Prices and availability subject to change. Additional terms may apply.

Flight Schedule for LHR to IAD

Frequently asked questions

Can I catch a flight from LHR to Washington Dulles Intl. Airport (IAD) right now?
Ensure you check out our Covid-19 Travel Advisor to learn if there are any current quarantine requirements and travel advice reports in place in IAD when flying in from LHR.
Are there direct flights from Heathrow Airport to Washington Dulles Intl. Airport (IAD)?
United Airlines and British Airways are some of the airlines that advertise nonstop flights from London Heathrow to Dulles Intl. Airport. If you want to get to where you’re headed without a layover, these are the options for you.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to IAD, please visit our Customer Service Portal.
How long is the flight from London Heathrow to IAD?
The flight between Heathrow Airport and Washington Dulles Intl. Airport (IAD) is usually about 8 hours and 14 minutes. Make your trip enjoyable by saving a movie or a few TV shows on your tablet or laptop and enjoying them with your seat fully reclined.
What is the flight distance from Heathrow Airport to Dulles Intl. Airport?
Your plane will have traveled 3,700 mi by the time you’ve taken off from Heathrow Airport (LHR) and landed smoothly at IAD. We suggest you bring plenty of activities to keep you occupied — it’s going to be a long flight.
What airlines fly from London Heathrow to Washington Dulles Intl. Airport (IAD)?
You’ll find a few airlines advertising direct flights between London and Sterling. United Airlines (UA) is one of the most reliable. This air carrier operates roughly 60 flights every month. A popular alternative is British Airways (BA), which offers 60 flights each month. The more airlines you look into, the more likely you are to pick up an amazing deal.
What airlines have practices regarding COVID-19 in place and use social distancing?
From the moment you enter the departure terminal to when you leave the arrivals terminal, if you’re flying with United Airlines, Delta or American Airlines you can be sure that COVID-19 measures and social distancing rules have been adhered to. Many airlines have introduced capped capacity flights and keeping the middle seat empty.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.


Traveling From
Traveling To
Washington Dulles Intl.
Shortest Flight Time
8 hours 0 mins
Earliest Departure Time
8:00AM BST
Latest Departure Time
7:05PM BST
Lowest Flight Price

Route Info

Flight path for flights from London Heathrow Airport to Washington Dulles International Airport

3,687.00 miles

Airlines & Aircraft Used on LHR to IAD Flight Routes

Airline Carrier
American Airlines
Boeing 737-700 pax
Delta Air Lines
Airbus A321-100/200
Boeing 737 all pax models

Discover our best flights from London LHR to Washington IAD. 

With 20 airlines to choose from on Travelocity, you can easily find the best option for you. Use our filters to sort by price, compare airlines, and find the most convenient flight times. 


Find our best return flights from London LHR to Washington IAD at the right price  

Airfares to Washington IAD from London LHR currently cost between $481 and $1,864. It’s usually cheaper to book a round trip than two separate one-way flights. Prices and availability subject to change. Additional terms may apply. 


Book one-way flights from London LHR to Washington IAD 

If you want to be flexible about when you return, or keep your travel options open ended, a one-way flight could be just the ticket! You’ll find one-way airfares from London LHR to Washington IAD on Travelocity starting at $486. Prices and availability subject to change. Additional terms may apply. 


Get to Washington IAD from London LHR quicker with direct flights. 

Get to Washington faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to IAD from LHR to take around 8 hour(s) 0 min(s).  


Find our cheapest airfares for flights from London LHR to Washington IAD

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to IAD from LHR. Our Price Match Promise means if you find a lower rate on Travelocity.com or on another US-based website within 24 hours of booking, we’ll credit or refund the difference.  


Get our best airfare deals for your flight from London LHR to Washington IAD today 

If you’re flexible about when you travel, December is usually the cheapest month to fly from London LHR to Washington IAD. If you need to be more specific, search by date and arrival and departure times.Then, compare prices across different airlines, and sort results by lowest price first. 


Book flexible airline tickets for flights to Washington IAD from London LHR 

Some airlines let you change your travel dates without charging a fee. Use our ‘no change fee’ filter to see which flights to IAD from LHR have this option.  


Travel with confidence when you book flights to Washington IAD from London LHR with Travelocity 

We’ve secured fantastic deals with all the main airline carriers and it’s easy to compare, choose, and book with Travelocity. With 24/7 customer service and our free 'App', we’ll always keep you moving. 

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.