Question 1

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

Accepted Answer

According to our current data, Finnair (£482), JetBlue (£483), and TAP AIR PORTUGAL (£483) offers the cheapest pricing from London Heathrow Airport to Washington, D.C.. Finnair is currently priced 17% below the average price you’ll pay for this route.

Question 2

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

Accepted Answer

The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as £370. However, be on the lookout for offers from JetBlue and Aer Lingus, as they are both options that can get you from London Heathrow Airport to Washington, D.C. for a low price.

Question 3

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

Accepted Answer

The best time to book flights from London Heathrow Airport to Washington, D.C. is 79 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Question 4

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. (average of £599). Flying from London Heathrow Airport to Washington, D.C. in July is currently the most expensive (average of £947). 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 London Heathrow Airport to Washington, D.C.?

Accepted Answer

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

Question 6

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

Accepted Answer

The most flights from LHR to WAS 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 (16 on average).

Question 7

E

Accepted Answer

In terms of precipitation, rainfall in Washington, D.C. ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. when rainfall is around 66.0 mm.

Question 8

E

Accepted Answer

If weather is an important factor for your trip to Washington, D.C., 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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

Question 9

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

Accepted Answer

When deciding which route to take from London Heathrow Airport to Washington, D.C. consider London Heathrow - Washington, D.C. Dulles Intl, London Heathrow - Baltimore/Washington or London Heathrow - Washington, D.C. Reagan-National as they are the most popular.

Question 10

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

Accepted Answer

Looking for the cheapest flight from London Heathrow Airport to Washington, D.C.? While on average our users pay £1,637, our data indicates the cheapest price to be £433. The most popular route (London Heathrow - Washington, D.C. Dulles Intl), is priced around £341.

Question 11

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

Accepted Answer

Consider Air Canada (76%), Austrian Airlines (76%) or Copa Airlines (76%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Washington, D.C..

Question 12

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

Accepted Answer

When booking a flight from London Heathrow Airport to Washington, D.C., you may want to consider flying on Air France, Finnair or British Airways as they are the most popular for this route.

Question 13

Where are the most common stopover locations when flying from London Heathrow Airport to Washington, D.C.?

Accepted Answer

The most popular stopover on flights from London Heathrow Airport to Washington, D.C. is Dublin.

Question 14

Where are the least popular stopover locations for London Heathrow Airport to Washington, D.C. flights?

Accepted Answer

London Heathrow Airport to Washington, D.C. flights have a stopover in Reykjavik the least frequently.

Question 15

What are some popular things to do or see while on a stopover in Dublin?

Accepted Answer

Bord Gáis Energy Theatre, 3Olympia Theatre, and Vicar Street are currently the most popular points of interest in Dublin at the moment. Those on a stopover in Dublin interested in visiting Bord Gáis Energy Theatre, 3Olympia Theatre, or Vicar Street can do so by traveling 5.7 mi, 5.7 mi, and 5.9 mi, respectively from Dublin. Those looking to explore during their stopover in Dublin can hire a car from Dublin for about £20 per day.

Question 16

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

Accepted Answer

Flights from London Heathrow Airport to Washington, D.C. are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Washington, D.C..

Question 17

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

Accepted Answer

Travelers have found it’s best to book a flight 50 days in advance to save up to 30% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 50 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London Heathrow Airport to Washington, D.C. 1-2 weeks in advance for as low as £547, or £757 for flights within the next 24 hours.

Question 18

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

Accepted Answer

Due to multiple factors, expect to potentially pay more when booking in July. For low rates, February can be a great choice for travel to Washington, D.C.. Flights to Washington, D.C. from London Heathrow Airport in February are about £543 on average during February, but can be found for as low as £223.

Question 19

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

Accepted Answer

When flying from London Heathrow Airport to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 21% versus a flight in the afternoon.

Question 20

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

Accepted Answer

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

Question 21

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

Accepted Answer

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

Question 22

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

Accepted Answer

Yes. Cheapflights offers flight deals from Heathrow to Washington, D.C. 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 23

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

Accepted Answer

Cheapflights makes it easy to find Heathrow to Washington, D.C. flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Question 24

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

Accepted Answer

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Washington, D.C. from Heathrow.

Question 25

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

Accepted Answer

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

Question 26

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

Accepted Answer

Yes, Cheapflights offers price alerts on Heathrow to Washington, D.C. flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

Round-trip from	£482
One-way from	£300
Popular in	August
Cheapest in	February
Average price	£700
Good round-trip deal	£500 or less
Good one-way deal	£586 or less

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest£185	Average£493	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
PLAY	Cheapest£269	Average£427	FlexibilityNo cancel fee	On-timeN/A	Search PLAY flights
Air France	Cheapest£288	Average£657	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Icelandair	Cheapest£357	Average£516	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
TAP AIR PORTUGAL	Cheapest£361	Average£537	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
JetBlue	Cheapest£368	Average£558	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
Brussels Airlines	Cheapest£374	Average£954	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Finnair	Cheapest£430	Average£620	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Scandinavian Airlines	Cheapest£430	Average£569	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Lufthansa	Cheapest£442	Average£624	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

Cheap flights from London Heathrow Airport to Washington, D.C. from £259

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 21/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. are usually found in February or March, booked 79 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

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

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

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

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

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

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

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

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

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

Find hourly flight availability from Heathrow to Washington, D.C.. 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.

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

Use this chart to determine the cheapest time to fly return from Heathrow to Washington, D.C.. Price data was last updated on 16 December 2024.

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

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

Reviews of airlines servicing Washington, D.C.

Read through reviews of airlines operating flights from London Heathrow Airport to Washington, D.C., such as Delta, Austrian Airlines, andFinnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

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

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

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

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

Where are the most common stopover locations when flying from London Heathrow Airport to Washington, D.C.?

What are some popular things to do or see while on a stopover in Dublin?

Where are the least popular stopover locations for London Heathrow Airport to Washington, D.C. flights?

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

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

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

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

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Fly from Heathrow to Washington, D.C. on these airlines

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Top 10 airlines flying from Heathrow to Washington, D.C.

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

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

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