Cheap Flights from IAD to LHR in 2019

Top last minute flight deals

Feeling spontaneous? It’s never too late to book a trip. Here’s our pick of the best last minute flights to London...
Estimated lowest prices only. Found in the last 14 days.

Flight information Washington Dulles to London Heathrow

Cheapest roundtrip price last month


Non-stop airlines


Flights per week


Average flight time, total distance 3671 miles

7h 0min

Most popular airline last month


London Heathrow

1 airport

Frequently asked questions

There's one airport in London Heathrow: London Heathrow.
The best price found on Skyscanner for a flight from Washington Dulles to London Heathrow is $58. This was found by aggregating across different carriers and is the cheapest price for the whole month.
7h 0min is the average flight time from Washington Dulles to London Heathrow.
There are 9 airlines who fly non-stop from Washington Dulles to London Heathrow.
There are 46 flights per week flying from Washington Dulles to London Heathrow, as of October.

How do I find cheap flight deals from IAD to London?

The secret lies in the flexibility of the dates! Traveling during periods of low season guarantees savings not only in flights, but also in hotels, car rentals and other travel services.

With flexible dates, just follow these three steps to find cheap flights from IAD to London:

  1. Do a search for the cheapest month on our site. In this way, you discover the best time to travel to London
  2. Create a price alert to monitor prices. By saving a search on our website and / or travel app, you'll receive emails or push notifications every time the price changes so you can book at the best time.
  3. Search for last minute flight deals from IAD to London. Airlines frequently lower prices at the last minute to fill any remaining seats, so if you're flexible and willing to take a chance, searching last minute might be the way to go!

That's the best way to buy cheap airline tickets! Start your search today:

Are there non-stop flights from IAD to London?

Yes! The IAD to London route is popular among international travelers who are flying out on business and vacation. Skyscanner can help you find the fastest non-stop flights for the cheapest possible prices. We scour the web looking for the best flight deals so you don't have to. Look at these amazing cheap flight deals:

Direct Flights from IAD to London
Airline Airports (From/To) Price*
Finnair Washington D.C (IAD)/London (Any) $546
Lufthansa Washington D.C (IAD)/London (Any) $555
Austrian Airlines Washington D.C (IAD)/London (Any) $560
British Airways Washington D.C (IAD)/London (Any) $571

*Average lowest prices found in the last 15 days on our site, considering rate estimates and return flights for an adult in the cheapest month. Values subject to availability. Prices change according to the airport of origin and selected date.

Which airlines fly from IAD to London?

What documents do I need to travel from IAD to London?

As long as you carry the appropriate documents, flying to London is easy to do. In order to gain entry into London, you need to have a passport that has an expiration date beyond the length of your stay. U.S. travelers are permitted to stay in London and the entire United Kingdom for up to six months without obtaining a travel visa. If you lose your ID while traveling, don't panic, just follow these simple steps. Also keep in mind that the Real ID laws go into effect in 2020; read all about it here.

What airport should I fly into from IAD to London?

Serving over 75 million passengers each year, London Heathrow (LHR) is the main international airport of London. London Heathrow Airport is located approximately 15 miles away from the downtown city center and is a four-terminal airport

London Gatwick Airport (LGW) is the second largest airport serving London and it transports over 46 million passengers annually. London Gatwick Airport is located approximately 26 miles south out downtown London.

When is the best time to book flights from IAD to London?

Historically, the cheapest time of year to fly the IAD to London route is in January. When you book your flight during the month of January, you can find cheap flights for around $500. For even more savings, book your flight on a Tuesday or Wednesday as these are the cheapest days of the week to fly to any destination. Find more information on the best time to book flights.

What are the baggage fees & size restrictions for flights from IAD to London?

Luggage size restrictions and fees may apply depending on what airline you fly to London with. Some airlines still charge up to $30 per piece of checked luggage for an international flight and only allow bags up to 45" tall. Check out this chart to see what the baggage rules are for your airline.

What are some tips to surviving the long flight from IAD to London

The flight from IAD to London takes just under eight hours on average depending on the route and current weather conditions at the time of your flight. To some, this can be an unbearably long time in the air. Prepare for your long flight ahead of time and ensure you pack plenty of healthy snacks, portable games, books, hobby materials, etc. For fun, create a flight kit for yourself that is filled with new and interesting things, much like what you would pack for kids. If you are able to, spend a little extra money to get a seat upgrade. Read this article for even more long flight survival tips.

What is the exchange rate from traveling from IAD to London?

The official currency of London is the pound and US travelers will lose a little value for every dollar that is exchanged for a pound. At present, every pound purchased will cost $1.27. You can exchange your money at the airport, at any large bank in London, or even at a currency exchange market.

How many estimated miles can you collect from IAD to London?

The distance from IAD to London is approximately 3,677 miles. Depending on what airline you fly with, you could earn thousands of airline miles in a single flight. Also be sure to check to see if your current airline miles membership offers partnerships with other airlines. For example, British Airways is a member of the One World program which means you can use the points earned on a flight with them on a future American Airlines flight if you choose. Check with your specific airline for the exact airline miles calculation.

What are the top things to do in London?

Looking for something fun and interesting to do while you visit London? Here are some of the top attractions to check out while you are in town:

  • Buckingham Palace - Historic castle that is home to the British Royal family and where royal business is conducted.
  • Big Ben - The iconic clock tower in downtown London.
  • Warner Bros. Studio Tour London- The Making of Harry Potter - An adventurous tour where you can check out the film set and props used in the movies.
  • Tower of London - Fascinating 900-year old building that is home to some of the crown jewels and has also served as an official palace, prison, arsenal, and more.

How Can I Rent a Car When I get to London?

To ensure you get to see all of the sights you want to check out, rent a car and have the freedom to explore London on your own terms. Skyscanner makes renting a car easy! Click here to get the best rates on car rentals in London. Rental cars can be picked up from the airport or car rental shops located throughout the city.

What are the best hotels to stay at in London?

Skyscanner can help you out with finding a cheap hotel room too! Check out our hotels page where you can plug in all of your desired lodging information and find amazing deals on a room. Here are some of the best hotels the city has to offer:

When you fly from Washington, D.C. to London, you are leaving a relatively small city for a major metropolitan area. London’s nearly 9 million people make it a bustling, busy place. You will also experience some sticker shock when paying for things.

Perhaps most importantly, you should get some details about each of the airports you will be using. Learn about Dulles Airport and Heathrow Airport, so your flight can go as smoothly as possible.

Departing Airport

Be prepared for the sheer size of the Dulles terminal. Concourse A has 35 commuter gates and 12 mainline gates, Concourse B has 29 mainline gates, Concourse C has 22 mainline gates, Concourse D has 22 mainline gates and Concourse Z has 4 mainline gates.

Passengers navigate the Terminal on the AeroTrain. There are also transports between Concourses C and D. A moving sidewalk transports passengers from the terminal to Concourse B.

Dulles Airport has parking rates that average $6.00 per hour. Day rates range from $10 to $30, depending on the lot you choose.

Arrive two-and-one-half hours before your flight departure time to allow for navigating the airport and going through security check.


You can search for flight deals using Skyscanner’s Flights Search.

Dulles offers non-stop flights to London. Carriers that fly non-stop include American, Finnair, Iberia, British Airways, Austrian, United, Lufthansa, Delta and Virgin Atlantic.

Iceland Air and Aer Lingus offer connecting flights to London.

Find the best time to fly by using the Skyscanner price alerts function. You will be notified any time one of your flight prices go up or down.

Arrival Airport

Heathrow Terminals 2, 3, and 5 are the destinations for your flight from Washington, D.C., depending on which airline you choose. Because you will be arriving from a non-EU destination, you will go to the red customs point to declare anything.

Note that baggage trolleys are available, as well as assistance for the disabled and cellphone rental.

When you arrive, be sure to go to Café Nero, where you will hear live music. You may also visit the numerous lounges throughout the terminal.

Note that going through customs can add time to your arrival, so allow for it. Also, you will need time to travel through the terminal to your exit, which can be quite far away from your arrival gate.

Comparison of Washington, D.C. vs. London

London time is 5 hours ahead of Washington, D.C.

Meals are 28% more expensive in London, but general consumer prices are nearly 8% lower. You will find taxis 200% more expensive in London.

Despite London’s reputation for being foggy, it has fewer rainy days than Washington, D.C. It averages 106 rainy days vs. Washington’s 114.

London has a population of 8.6 million as opposed to the .62 million in Washington. In addition, London has 240 museums, while Washington has 73.

Heathrow handles nearly 1300 flights per day, compared to Dulles, which has 1,800 to 2,000 per day.

Skyscanner App Reviews & Ratings:

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Prices shown on this page are estimated lowest prices only. Found in the last 45 days.