Question 1

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

Accepted Answer

Currently priced at £410, British Airways will fly you from Washington, D.C. to London Heathrow Airport and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and Delta - these airlines can fly you to your destination from £411 and £412, respectively. You may be able to fly from Washington, D.C. to London Heathrow Airport for 27% less than the average price by searching for these airlines.

Question 2

What are the cheapest airlines to fly from Washington, D.C. to London Heathrow Airport one-way?

Accepted Answer

One-way options have recently been found by users for as low as £154 on Icelandair. Other airlines that offer cheap prices include TAP AIR PORTUGAL from £194 and Iberia from £209 one-way.

Question 3

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

Accepted Answer

Booking 74 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Question 4

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to London Heathrow Airport (average of £112). Flying from Washington, D.C. 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.

Question 5

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

Accepted Answer

Travellers seeking maximum savings on their Washington, D.C. to London Heathrow Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Question 6

Weekly flight availability from Washington, D.C. to London Heathrow Airport

Accepted Answer

The most flights from WAS to LHR are scheduled on a Tuesday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).

Question 7

E

Accepted Answer

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Question 8

E

Accepted Answer

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Question 9

What are the most popular routes from Washington, D.C. to London Heathrow Airport?

Accepted Answer

Most travelers choose Washington, D.C. Dulles Intl - London Heathrow, Baltimore/Washington - London Heathrow or Washington, D.C. Reagan-National - London Heathrow when deciding on the best route from Washington, D.C. to London Heathrow Airport.

Question 10

What are the cheapest flights from Washington, D.C. to London Heathrow Airport?

Accepted Answer

While on average a flight from Washington, D.C. to London Heathrow Airport is generally £1,132, our data shows the cheapest flight currently is £259. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay £292 for that flight.

Question 11

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

Accepted Answer

No one likes to see their flight delayed. When booking a flight from Washington, D.C. to London Heathrow Airport consider choosing KLM (68%), Air France (68%) or Delta (68%) as they are the most reliable in getting you off to your destination on time.

Question 12

What are the most popular airlines that fly from Washington, D.C. to London Heathrow Airport?

Accepted Answer

Air France, British Airways and Icelandair are the most popular airlines when flying from Washington, D.C. to London Heathrow Airport.

Question 13

What is the cheapest day to fly round-trip from Washington, D.C. to London Heathrow Airport?

Accepted Answer

Departing on a Monday is a good option for securing a great price. You can expect to save up to 15% when planning your travel around this day of the week.

Question 14

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

Accepted Answer

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 48 days in advance, which can save you up to 37% on flights from Washington, D.C. to London Heathrow Airport compared to booking the week you need them. Waiting 48 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at £584. For sooner than that we have options available in the next 3 days from £679.

Question 15

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

Accepted Answer

January is one of the best times of the year to fly to London Heathrow Airport from Washington, D.C.. Prices for January average £539 per person but you can even find prices for as low as £280. The most expensive prices can be found in the month of June. Opting for a January flight can save you 30% on your journey compared to booking in June

Question 16

What is the cheapest time of day to fly from WAS to LHR?

Accepted Answer

It’s typically best to fly out from Washington, D.C. to London Heathrow Airport at midday. Doing so could potentially save you 6% on the flight price compared to flying in the morning, which is usually more expensive.

Question 17

Can I find deals for flights from Washington, D.C. to Heathrow that include hotel bookings?

Accepted Answer

Yes. In addition to deals on Washington, D.C. to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

Question 18

How can I find direct flights from Washington, D.C. to Heathrow?

Accepted Answer

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Heathrow.

Question 19

Can I find deals for business class flights from Washington, D.C. to Heathrow?

Accepted Answer

Yes. Cheapflights offers flight deals from Washington, D.C. 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.

Question 20

How does Cheapflights help users find flights from Washington, D.C. to Heathrow?

Accepted Answer

When you search for this flight from Washington, D.C. to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Question 21

Why should you use Cheapflights to find cheap flight tickets from Washington, D.C. to Heathrow?

Accepted Answer

Cheapflights helps you find that perfect flight to Heathrow from Washington, D.C. by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Question 22

Can Cheapflights find flights from Washington, D.C. to Heathrow with no change fees?

Accepted Answer

Users can book flights with no change fees policies with our dedicated filters. Book flights from Washington, D.C. to Heathrow flexibly with Cheapflights today.

Question 23

Can Cheapflights notify me if prices for flights from Washington, D.C. to Heathrow become cheaper?

Accepted Answer

Not ready to book yet? You can track prices for flights from Washington, D.C. to Heathrow on Cheapflights with our Price Alert feature and get notified when better prices are available.

Round-trip from	£410
One-way from	£154
Popular in	June
Cheapest in	February
Average price	£661
Good round-trip deal	£481 or less
Good one-way deal	£296 or less

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£349	Average£535	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Iberia	Cheapest£405	Average£552	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Lufthansa	Cheapest£409	Average£737	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Air France	Cheapest£415	Average£538	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Virgin Atlantic	Cheapest£424	Average£648	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£443	Average£557	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£449	Average£538	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£475	Average£611	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
American Airlines	Cheapest£482	Average£702	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

Cheap flights from Washington, D.C. to London Heathrow Airport from £154

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 12/10. 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. to London Heathrow are usually found in February or October, booked 74 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Washington, D.C. to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Washington, D.C. to Heathrow

Cheapest flights from Washington, D.C. to HeathrowExplore the most affordable flight options available from Washington, D.C. to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 July 2025.

Explore the most affordable flight options available from Washington, D.C. to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to London Heathrow Airport that are best for you.

Best time to book a flight from Washington, D.C. to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Washington, D.C. with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to London Heathrow Airport

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

Use this chart to determine the optimal time to book a return flight from Washington, D.C. to Heathrow. Price data was last updated on 27 June 2025.

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

What is the cheapest time of day to fly from WAS to LHR?

Find hourly flight availability from Washington, D.C. 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 2 July 2025.

Weekly flight availability from Washington, D.C. to London Heathrow Airport

How much does it cost for a return flight from Washington, D.C. to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Delta, KLM, andFinnair from Washington, D.C. to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. 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. to London Heathrow Airport round-trip?

What are the cheapest airlines to fly from Washington, D.C. to London Heathrow Airport one-way?

What are the most popular routes from Washington, D.C. to London Heathrow Airport?

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

What are the cheapest flights from Washington, D.C. to London Heathrow Airport?

Can I find deals for flights from Washington, D.C. to Heathrow that include hotel bookings?

How can I find direct flights from Washington, D.C. to Heathrow?

Can I find deals for business class flights from Washington, D.C. to Heathrow?

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

Travelling to a place near Washington, D.C.?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington, D.C. to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Top 9 airlines flying from Washington, D.C. to Heathrow

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Washington, D.C. to Heathrow?

Why should you use Cheapflights to find cheap flight tickets from Washington, D.C. to Heathrow?

Can Cheapflights find flights from Washington, D.C. to Heathrow with no change fees?

Can Cheapflights notify me if prices for flights from Washington, D.C. to Heathrow become cheaper?

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Washington, D.C. to Heathrow
Explore the most affordable flight options available from Washington, D.C. to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 July 2025.