LHR - WAS

$369 Find Cheap Flights from London Heathrow Airport to Washington, D.C.

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Washington, D.C. departing on 5/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C.

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Washington, D.C..
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Washington, D.C..
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$537
Typical prices: $688-$878
Austrian Airlines, Brussels Airlines
sam. 4/18sam. 4/25
LHR - IAD • 1 stop
Cheapest non-stop
$542
Typical prices: $691-$942
British Airways
ven. 4/17mer. 4/22
LHR - IAD • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
British Airways' premium economy offers more space.
Heathrow's security lines can be long; arrive early.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $542 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with British Airways, United Airlines and Virgin Atlantic. Average duration is 8h 33m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top routes
Cheapest • 15% average savings
Most popular
Insights
Insights
Insights
Insights
Avoid delays
Most punctual • 90% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $590 (round-trip)
Shortest trip • 10h 59m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 29% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 15% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Washington, D.C.!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Heathrow to Washington, D.C. (LHR-WAS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Heathrow to Washington, D.C. that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Heathrow to Washington, D.C.

sam., avr. 18 - sam., avr. 25
Multiple Airlines Logo
7:30 pm - 2:35 pm
LHR
-
IAD
24h 05m
1 stop
Multiple Airlines Logo
5:20 pm - 12:25 pm
IAD
-
LHR
14h 05m
1 stop
$537Multiple Airlines
mer., sept. 2 - mer., sept. 9
Multiple Airlines Logo
6:30 am - 3:15 pm
LHR
-
IAD
13h 45m
1 stop
Multiple Airlines Logo
8:20 pm - 5:50 pm
IAD
-
LHR
16h 30m
1 stop
$538Multiple Airlines
jeu., avr. 23 - jeu., avr. 30
Multiple Airlines Logo
6:00 am - 2:35 pm
LHR
-
IAD
13h 35m
1 stop
Multiple Airlines Logo
10:20 pm - 10:40 pm
IAD
-
LHR
19h 20m
1 stop
$540Multiple Airlines
ven., avr. 17 - mer., avr. 22
British Airways Logo
5:05 pm - 8:10 pm
LHR
-
IAD
8h 05mnonstop
British Airways Logo
7:05 pm - 7:45 am
IAD
-
LHR
7h 40mnonstop
$542British Airways
sam., avr. 11 - sam., sept. 19
British Airways Logo
4:25 pm - 7:40 pm
LHR
-
BWI
8h 15mnonstop
British Airways Logo
7:25 pm - 7:45 am
BWI
-
LHR
7h 20mnonstop
$542British Airways
dim., avr. 19 - dim., mai 3
Icelandair Logo
9:25 pm - 7:20 pm
LHR
-
IAD
26h 55m
1 stop
Icelandair Logo
8:30 pm - 11:55 am
IAD
-
LHR
10h 25m
1 stop
$543Icelandair
sam., avr. 25 - dim., avr. 26
United Airlines Logo
8:45 am - 4:45 pm
LHR
-
IAD
13h 00m
1 stop
United Airlines Logo
10:10 pm - 10:40 am
IAD
-
LHR
7h 30mnonstop
$544United Airlines
jeu., avr. 30 - mer., mai 6
Icelandair Logo
1:05 pm - 7:20 pm
LHR
-
IAD
11h 15m
1 stop
Icelandair Logo
8:30 pm - 11:55 am
IAD
-
LHR
10h 25m
1 stop
$545Icelandair
ven., avr. 24 - dim., avr. 26
United Airlines Logo
8:40 am - 4:45 pm
LHR
-
IAD
13h 05m
1 stop
United Airlines Logo
10:10 pm - 10:40 am
IAD
-
LHR
7h 30mnonstop
$546United Airlines
ven., avr. 17 - mar., avr. 21
Austrian Airlines Logo
6:00 am - 2:35 pm
LHR
-
IAD
13h 35m
1 stop
Austrian Airlines Logo
6:25 pm - 6:55 am
IAD
-
LHR
7h 30mnonstop
$547Austrian Airlines
Booking Insights

KAYAK's insights & trends for Heathrow to Washington, D.C. flights

Get data-powered insights and trends into flights from Heathrow to Washington, D.C. to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from London Heathrow Airport to Washington, D.C.?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from London Heathrow Airport to Washington, D.C. departing in April.

What is the cheapest London Heathrow Airport to Washington, D.C. flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from London Heathrow Airport to Washington, D.C. costs $580 on the route between London Heathrow Airport (LHR) and Washington, D.C. Dulles Intl Airport (IAD). Over the past month, this route was, on average, 15% cheaper than other London Heathrow Airport-Washington, D.C. routes. It is also the most popular route.

What’s the cheapest day of the week to fly from London Heathrow Airport to Washington, D.C.?

The average price of all round-trip flights from London Heathrow Airport to Washington, D.C. clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from London Heathrow Airport to Washington, D.C., look for departures on Thursdays and avoid leaving on a Tuesday, as it's usually the priciest day. When flying back from Washington, D.C., Wednesday is the cheapest day to fly and Saturday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to Washington, D.C., removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London Heathrow Airport to Washington, D.C. is January, where tickets cost $613 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is $876 and $798 respectively.

Can I save money by flying with a layover from London Heathrow Airport to Washington, D.C.?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $797 on average.

How far in advance should I book a flight from London Heathrow Airport to Washington, D.C.?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to Washington, D.C., removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from London Heathrow Airport to Washington, D.C., you should book around 5 weeks before departure, which saves you about 29% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Expert advice

Expert advice for your flight from Heathrow to Washington, D.C.

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Duncan Madden

Duncan Madden

Expert on British Airways and LHR

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Stefanie Waldek

Stefanie Waldek

Expert on United Airlines, Delta and IAD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Laura Ratliff

Laura Ratliff

Expert on Virgin Atlantic

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Good to know

Low seasonFebruary
Cheapest flight$369
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from London Heathrow Airport to Baltimore

When to book flights from Heathrow to Washington, D.C.

Are your dates flexible? Find out the best times to travel from Heathrow to Washington, D.C. based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking London Heathrow Airport to Washington, D.C. flights

  • What is the cheapest flight from London Heathrow Airport to Washington, D.C.?

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to Washington, D.C. was $369 for a one-way ticket and $537 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and Washington, D.C.?

    A passport is required to fly from London Heathrow Airport to Washington, D.C..

  • Which airports will I be using when flying from London Heathrow Airport to Washington, D.C.?

    On your way to Washington, D.C., you’ll fly out from London Heathrow. You’ll be landing in one of Washington, D.C.’s 2 airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl.

  • Which airlines offer Wi-Fi service onboard planes from London Heathrow Airport to Washington, D.C.?

    Only KLM offers inflight Wi-Fi service on the London Heathrow Airport to Washington, D.C. flight route.

  • Which aircraft models fly most regularly from London Heathrow Airport to Washington, D.C.?

    The Boeing 777 is the aircraft model that flies most regularly on the London Heathrow Airport to Washington, D.C. flight route.

  • Which airline alliances offer flights from London Heathrow Airport to Washington, D.C.?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between London Heathrow Airport and Washington, D.C., with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from London Heathrow Airport to Washington, D.C.?

    There are nonstop flights from London Heathrow Airport to Washington, D.C. on a daily basis.

  • Which is the best airline for flights from London to Washington, D.C., Delta or Austrian Airlines?

    The two airlines most popular with KAYAK users for flights from London to Washington, D.C. are Delta and Austrian Airlines. With an average price for the route of $867 and an overall rating of 7.9, Delta is the most popular choice. Austrian Airlines is also a great choice for the route, with an average price of $871 and an overall rating of 7.6.

  • How does KAYAK find such low prices on flights from London Heathrow Airport to Washington, D.C.?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London Heathrow Airport to Washington, D.C..

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London Heathrow Airport to Washington, D.C.?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington, D.C. from London Heathrow Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London Heathrow Airport to Washington, D.C.?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington, D.C. with an airline and back to London Heathrow Airport with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London Heathrow Airport to Washington, D.C.?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington, D.C. from London Heathrow Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from London Heathrow Airport to Washington, D.C.

  • Looking for a cheap flight? 25% of our users found flights on this route for $674 or less one-way and $724 or less round-trip.

Prefer to fly direct from London Heathrow Airport to Washington, D.C.?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from London Heathrow to Washington, D.C..
Find which airlines fly direct from London Heathrow Airport to Washington, D.C., which days they fly and book direct flights.

Direct departures

London Heathrow to Washington, D.C.

Monday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Tuesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Wednesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Thursday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Friday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Saturday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Sunday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

See more direct flights

Direct returns

Washington, D.C. to London Heathrow

Monday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Tuesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Wednesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Thursday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Friday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Saturday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Sunday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

See more direct flights

Reviews of the top 5 airlines serving from Heathrow to Washington, D.C.

 
See real verified KAYAK customer reviews for airlines flying from London to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Heathrow to Washington, D.C.? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8291 reviews
8.5Crew
7.9Comfort
7.2Food
7.8Entertainment
8.1Boarding
Airline reviews

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

2.0 MediocreSusan, Mar 2026
JAX - ATL
Read more Delta reviews

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

The WiFi was not working. That made for a long flight.

Absolutely no communication on why there's a delay and multiple flight time reschedules. I would have canceled the flight and drove back home if I known it was going to be rescheduled 3 or 4 times.

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was flying with 30% capacity. The flight my seat from preferred seating to back of the seat. Even though i can understand that this was to balance the flight weight. The flight attendance decided to do the serving near my seat and in the middle , their noices woke me up from sleep , when i realized that the service has ended and when they were going back asked for a coffee, for which they answered they have completed teh service in my location. That really upset me as they woke me up and also rejected the coffee i asked. I ended up landing with a headache, thanks to the crew that screwed up my travel

My seat 3G did not go down fully and the buttons were not working properly

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

Great crew - old style upper class seats on the older fleet now feels dated

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

When I went to check in at the United counter in Barcelona, Spain I had 2 different menat 2 different times in United uniforms (standing around with a couple other employees) ask me if I was traveling alone. The one man asked me 3 different ways if I was traveling alone. I am, 68 yeaers old and have all my faculties. I thought it was weird and it made me feel very uncomfortable. What difference does it make if I was traveling alone or with someone? What if I was a recent widow? That would have been horrible. They never gave me a reason why they needed to know who I was traveling with. I was hesitant to question them because I needed to be on that flight.

We were delayed for about an hour from taking off due to traffic control procedures at the destination airport. But once in the air, the flight went well. The crew members were great and provided cabin service despite moderate turbulence during much of the flight.

Crew was great. 2 1/2 hour delay was due to staff needing "rest" was avoidable and self inflicted as United not willing to hire enough crew to keep flight on time.. Ridiculous. The crew and the passengers both suffered due to this.

Fine not above and beyond as I had a connection that was delayed due to maintenance

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

Great other than a couple very drunk guys that for a while kept bumping my seat from behind. The staff did their best to control them. Even refused serving them alcohol and allowed the gal sitting next to them to move.

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

Older airplane with worn out seats. No entertainment system at all. Connecting to Wi-Fi was problematic and hit and miss.

Flight has been delayed every time I've ever taken it. Seats uncomfortable. Children behind me yelling the entire flight. Some of this is out of their control but overall just consistently not a great experience.

Poor communication ahead of time about flight delays and old planes/other equipment.

Never going to fly your airline again if it can be avoided.

An delay of almost 3 hours while passengers were already in the plane kept us very uncomfortable. The food was also very limited. A bad experience overall.

I understand that there is a catering issue - water should be the minimum stock. During the flight, not once that the attendants came through with water. The conversations in the kitchen were very loud and they were swearing. I do not expect any white glove service, at the minimum, we should be cordial. It was almost an inconveniece that we were on the flight. And it made us feel if you even dare question us, we'll make you deplane.

Not to have gotten delayed by 2+ hours for the fourth straight American flight. They're the worst.

The flight attendant use 1.5 hours to answer my call. My dirty food tray was unattended.

The flight was completely full. Crew was not happy. Everyone was rude and brusque. Travelling with an arm in a cast and seating in the first row of economy cabin (in front of the separation) I needed help retrieving my tray for the meal. A staff member literally threw the tray on my lap, without helping to take out the tray. Boarding was messy, with 300 people waiting in an encloses space with low ceiling. I will try to avoid AA next time I have a long flight.

The business class seats are dated and uncomfortable. The space is bare minimum and there is absolutely no privacy. For $4K, this is not what I expect.

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything you need to know for your flight from Heathrow to Washington, D.C.

Information on your arrival and departure airports