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

Flying on TAP AIR PORTUGAL is currently your cheapest option to Washington, D.C., with prices starting at $656. Additional round-trip tickets that might be worth considering are offered by JetBlue and SWISS, with the lowest prices starting at $657 and $657, respectively. These flights start at 11% lower than the current average price 3 months from now.

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

One-way options have recently been found by users for as low as $297 on PLAY. Other airlines that offer cheap prices include JetBlue from $526 and TAP AIR PORTUGAL from $537 one-way.

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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

While some choose either London Heathrow - Baltimore/Washington or London Heathrow - Washington, D.C. Reagan-National, London Heathrow - Washington, D.C. Dulles Intl is the most popular route from London to Washington, D.C..

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

Looking at all options, your cheapest flight can be booked for $597. While the most popular route (London Heathrow - Washington, D.C. Dulles Intl) can be booked for $466 on average our data indicates $2,041 when flying from London to Washington, D.C..

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

Before booking your flight to Washington, D.C. from London, check out the most reliable airlines to get you to your destination on time: Air Canada (76%), Austrian Airlines (76%), Copa Airlines( 76%).

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

When booking a flight from London to Washington, D.C., you may want to consider flying on American Airlines, British Airways or Delta as they are the most popular for this route.

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

It’s generally more expensive to depart on a Monday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

Find a great deal and save up to 30% by booking at least 50 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from London to Washington, D.C. within the next two weeks, with the cheapest ticket starting at $748.

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

February is one of the best times of the year to fly to Washington, D.C. from London. Prices for February average $742 per person but you can even find prices for as low as $305. The most expensive prices can be found in the month of July. Opting for a February flight can save you 20% on your journey compared to booking in July

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

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

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

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

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

Yes. Cheapflights offers flight deals from London 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.

$273+ Flights from London to Washington, D.C.

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Cheapflights Tip: The best prices from London to Washington, D.C. are usually found in February or November, booked 84 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

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

Round-trip from	$656 (oojo)
One-way from	$273 (Norse)
Popular in	July
Cheapest in	February
Average price	$893
Good round-trip deal	$672 or less
Good one-way deal	$701 or less

From London (LON) to Washington, D.C. (WAS)

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One-way flight from London (LON) to Washington, D.C. (WAS)

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Highest demand for flights based on searches. 14% potential increase in price ($123 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Price to beat on a round-trip flight from London (LON) to Washington, D.C. (WAS).

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Price to beat on a one-way flight from London (LON) to Washington, D.C. (WAS).

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

Cheapest flights from London to Washington, D.C.
Explore the most affordable flight options available from London to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 3, 2025.

jue. 8/2110:35 amLGW - IAD

1 stop33h 45mTAP AIR PORTUGAL

dom. 8/245:45 pmIAD - LGW

1 stop16h 25mTAP AIR PORTUGAL

Deal found 7/3

$656

vie. 10/1012:10 pmLGW - DCA

1 stop13h 41mJetBlue

mar. 10/144:39 pmDCA - LGW

1 stop11h 56mJetBlue

Deal found 7/2

$657

sáb. 9/69:20 amLCY - IAD

1 stop11h 55mSWISS

sáb. 9/138:45 pmIAD - LCY

1 stop12h 00mSWISS

Deal found 7/1

$657

dom. 8/1712:40 pmLHR - IAD

2 stops25h 57mMultiple Airlines

mié. 9/175:47 pmIAD - LHR

1 stop13h 33mMultiple Airlines

Deal found 7/3

$658

dom. 8/103:40 pmLGW - IAD

1 stop32h 40mIcelandair

vie. 8/1511:15 pmIAD - LGW

1 stop31h 30mIcelandair

Deal found 7/3

$658

dom. 9/79:45 amLHR - DCA

1 stop18h 22mFinnair

sáb. 9/137:23 pmDCA - LHR

1 stop21h 17mFinnair

Deal found 7/2

$658

vie. 8/298:55 amLCY - IAD

1 stop11h 20mLufthansa

mié. 10/86:10 pmIAD - LCY

1 stop19h 25mLufthansa

Deal found 7/2

$658

jue. 9/1810:00 amLCY - IAD

1 stop10h 35mVirgin Atlantic

vie. 9/267:20 amIAD - LCY

2 stops19h 50mVirgin Atlantic

Deal found 7/1

$659

mié. 10/18:25 amLHR - DCA

1 stop14h 35mJetBlue

mié. 10/296:00 amDCA - LHR

1 stop10h 45mJetBlue

Deal found 7/1

$660

jue. 8/288:00 amLHR - IAD

1 stop12h 20mTAP AIR PORTUGAL

mié. 9/35:50 pmIAD - LHR

1 stop11h 30mTAP AIR PORTUGAL

Deal found 7/1

$661

jue. 8/288:45 amLCY - IAD

1 stop11h 30mMultiple Airlines

mié. 9/108:45 pmIAD - LCY

1 stop10h 45mMultiple Airlines

Deal found 7/3

$661

vie. 8/2210:00 amLGW - IAD

1 stop14h 24mMultiple Airlines

mar. 8/2611:15 pmIAD - LGW

1 stop10h 25mMultiple Airlines

Deal found 7/2

$662

Best flights from London to Washington, D.C.
Discover carefully curated flight deals from London to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated julio 3, 2025.

jue. 8/2110:35 amLGW - IAD

1 stop33h 45mTAP AIR PORTUGAL

dom. 8/245:45 pmIAD - LGW

1 stop16h 25mTAP AIR PORTUGAL

Deal found 7/3

$656

vie. 10/1012:10 pmLGW - DCA

1 stop13h 41mJetBlue

mar. 10/144:39 pmDCA - LGW

1 stop11h 56mJetBlue

Deal found 7/2

$657

sáb. 9/69:20 amLCY - IAD

1 stop11h 55mSWISS

sáb. 9/138:45 pmIAD - LCY

1 stop12h 00mSWISS

Deal found 7/1

$657

dom. 8/1712:40 pmLHR - IAD

2 stops25h 57mMultiple Airlines

mié. 9/175:47 pmIAD - LHR

1 stop13h 33mMultiple Airlines

Deal found 7/3

$658

dom. 8/103:40 pmLGW - IAD

1 stop32h 40mIcelandair

vie. 8/1511:15 pmIAD - LGW

1 stop31h 30mIcelandair

Deal found 7/3

$658

dom. 9/79:45 amLHR - DCA

1 stop18h 22mFinnair

sáb. 9/137:23 pmDCA - LHR

1 stop21h 17mFinnair

Deal found 7/2

$658

vie. 8/298:55 amLCY - IAD

1 stop11h 20mLufthansa

mié. 10/86:10 pmIAD - LCY

1 stop19h 25mLufthansa

Deal found 7/2

$658

jue. 9/1810:00 amLCY - IAD

1 stop10h 35mVirgin Atlantic

vie. 9/267:20 amIAD - LCY

2 stops19h 50mVirgin Atlantic

Deal found 7/1

$659

jue. 8/2811:45 amLHR - DCA

2 stops16h 56mKLM

mié. 9/104:45 pmDCA - LHR

2 stops13h 00mKLM

Deal found 7/3

$662

lun. 9/89:30 amLHR - DCA

1 stop11h 21mAir Canada

vie. 9/129:40 amDCA - LHR

1 stop15h 50mAir Canada

Deal found 7/1

$663

lun. 8/259:05 pmLHR - IAD

2 stops27h 54mScandinavian Airlines

dom. 8/3110:05 pmIAD - LHR

1 stop18h 35mScandinavian Airlines

Deal found 7/3

$666

jue. 8/286:00 amLHR - IAD

2 stops38h 25mAustrian Airlines

lun. 9/85:16 pmIAD - LHR

2 stops31h 39mAustrian Airlines

Deal found 7/1

$667

Last-minute flights from London to Washington, D.C.
Discover last-minute flight deals from London to Washington, D.C.. Data last updated julio 3, 2025 and is based on user searches.

mar. 7/84:25 pmLGW - IAD

1 stop27h 55mTAP AIR PORTUGAL

mar. 7/155:00 pmIAD - LGW

1 stop11h 45mTAP AIR PORTUGAL

Deal found 7/1

$685

mar. 7/86:45 pmLHR - IAD

1 stop25h 35mTAP AIR PORTUGAL

mar. 7/155:00 pmIAD - LHR

1 stop19h 45mTAP AIR PORTUGAL

Deal found 7/1

$689

mié. 7/910:00 amLGW - BWI

1 stop13h 47mMultiple Airlines

dom. 8/107:38 pmBWI - LGW

1 stop30h 17mMultiple Airlines

Deal found 7/1

$771

mié. 7/98:10 pmSTN - IAD

2 stops23h 25mMultiple Airlines

dom. 7/206:10 pmIAD - STN

2 stops24h 40mMultiple Airlines

Deal found 7/3

$776

mié. 7/98:40 amLHR - IAD

1 stop11h 55mKLM

mar. 7/225:50 pmIAD - LHR

Nonstop7h 30mKLM

Deal found 7/1

$783

jue. 7/106:00 amLHR - BWI

2 stops30h 30mMultiple Airlines

lun. 7/217:10 amBWI - LHR

2 stops21h 50mMultiple Airlines

Deal found 7/3

$756

jue. 7/109:30 amLHR - DCA

1 stop11h 18mAir Canada

mar. 7/229:40 amDCA - LHR

1 stop15h 50mAir Canada

Deal found 7/2

$766

jue. 7/106:00 amLHR - IAD

1 stop15h 15mMultiple Airlines

lun. 7/216:35 pmIAD - LHR

Nonstop7h 20mMultiple Airlines

Deal found 7/3

$786

jue. 7/108:30 amLHR - IAD

1 stop11h 45mLufthansa

lun. 7/215:13 pmIAD - LHR

1 stop13h 32mLufthansa

Deal found 7/3

$788

vie. 7/1110:05 amLHR - DCA

1 stop11h 52mAmerican Airlines

vie. 8/155:30 pmDCA - LHR

1 stop9h 20mAmerican Airlines

Deal found 7/3

$743

vie. 7/1112:10 pmLGW - DCA

1 stop12h 53mJetBlue

lun. 7/141:44 pmDCA - LGW

1 stop14h 51mJetBlue

Deal found 7/1

$754

vie. 7/116:10 amLHR - DCA

2 stops18h 45mBritish Airways

vie. 8/152:35 pmDCA - LHR

1 stop13h 35mBritish Airways

Deal found 7/3

$788

One-way flights from London to Washington, D.C.
Search for one-way flight options from London to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated julio 3, 2025.

mié. 9/102:00 pmLGW - BWI

1 stop28h 04mMultiple Airlines

Deal found 7/2

$273

jue. 9/1811:40 amSTN - BWI

1 stop11h 00mPLAY

Deal found 7/2

$297

mar. 10/75:25 pmSTN - BWI

2 stops29h 15mMultiple Airlines

Deal found 7/2

$344

mar. 10/215:30 pmLHR - BWI

2 stops29h 10mMultiple Airlines

Deal found 7/1

$354

mar. 9/210:00 amLTN - IAD

2 stops14h 20mMultiple Airlines

Deal found 7/1

$516

lun. 9/110:00 amLGW - IAD

2 stops19h 16mMultiple Airlines

Deal found 7/1

$516

vie. 8/88:25 amLHR - DCA

1 stop16h 38mJetBlue

Deal found 7/1

$526

dom. 8/246:50 pmSTN - IAD

2 stops25h 30mMultiple Airlines

Deal found 7/1

$528

lun. 9/2211:20 amLHR - IAD

2 stops32h 46mMultiple Airlines

Deal found 7/3

$529

lun. 11/177:05 amLGW - DCA

3 stops30h 50mMultiple Airlines

Deal found 7/1

$529

lun. 10/1310:35 amLGW - IAD

1 stop15h 15mTAP AIR PORTUGAL

Deal found 7/2

$537

mié. 8/206:00 amLHR - IAD

1 stop19h 50mTAP AIR PORTUGAL

Deal found 7/1

$541

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

jue. 8/21

10:35 am-3:20 pm

1 stop33h 45m

Washington, D.C. Dulles Intl

dom. 8/24

5:45 pm-3:10 pm

1 stop16h 25m

$656

LondonWashington, D.C.

LGW - DCA

LGWDCA

London Gatwick

vie. 10/10

12:10 pm-8:51 pm

1 stop13h 41m

Washington, D.C. Reagan-National

mar. 10/14

4:39 pm-9:35 am

1 stop11h 56m

$657

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

sáb. 9/6

9:20 am-4:15 pm

1 stop11h 55m

Washington, D.C. Dulles Intl

sáb. 9/13

8:45 pm-1:45 pm

1 stop12h 00m

$657

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

dom. 8/17

12:40 pm-9:37 am

2 stops25h 57m

Washington, D.C. Dulles Intl

mié. 9/17

5:47 pm-12:20 pm

1 stop13h 33m

$658

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

dom. 8/10

3:40 pm-7:20 pm

1 stop32h 40m

Washington, D.C. Dulles Intl

vie. 8/15

11:15 pm-11:45 am

1 stop31h 30m

$658

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

dom. 9/7

9:45 am-11:07 pm

1 stop18h 22m

Washington, D.C. Reagan-National

sáb. 9/13

7:23 pm-9:40 pm

1 stop21h 17m

$658

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

vie. 8/29

8:55 am-3:15 pm

1 stop11h 20m

Washington, D.C. Dulles Intl

mié. 10/8

6:10 pm-6:35 pm

1 stop19h 25m

$658

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

jue. 9/18

10:00 am-3:35 pm

1 stop10h 35m

Washington, D.C. Dulles Intl

vie. 9/26

7:20 am-8:10 am

2 stops19h 50m

$659

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

mié. 10/1

8:25 am-6:00 pm

1 stop14h 35m

Washington, D.C. Reagan-National

mié. 10/29

6:00 am-8:45 pm

1 stop10h 45m

$660

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

jue. 8/28

8:00 am-3:20 pm

1 stop12h 20m

Washington, D.C. Dulles Intl

mié. 9/3

5:50 pm-10:20 am

1 stop11h 30m

$661

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 57 results

...

The best insider tips for London to Washington, D.C. flights

Cheapflights partnered with top experts to bring you the best recommendations for your London to Washington, D.C. trip

Airlines

British Airways

BA's Club Suite offers private pods with doors for enhanced privacy on long-haul flights.

BA's World Traveller Plus provides extra seat width, legroom, and upgraded service on long-haul flights.

Read more about British Airwaysby Gabriel Leigh

United Airlines

United's Polaris Business Class features lie-flat seats, large screens, and Saks Fifth Avenue bedding.

United's Premium Plus offers bigger seats, extra legroom, and upgraded meals on international flights.

Read more about United Airlinesby Harriet Baskas

Airports

LHR

Heathrow's strict security can cause delays. Ensure all liquids are in a single bag and remove suspicious items to avoid long waits.

IAD

Use the Silver Line Metro for a cost-effective trip to Washington, D.C. It takes under 40 minutes and is five minutes from the terminal.

Our travel experts

Gabriel Leigh

Expert on British Airways

Harriet Baskas

Expert on United Airlines

Ramsey Qubein

Expert on LHR and IAD

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

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

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

To ensure you get the cheapest price possible for a flight from London to Washington, D.C., you should look to book at least 84 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from London to Washington, D.C. (average of $309). Flying from London to Washington, D.C. in July is currently the most expensive (average of $345). 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.

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

A simple way to save on the total cost of your ticket is to fly from London to Washington, D.C. in the evening. If you’re flexible enough to do this you can expect to save up to 15% on your trip compared to booking a flight in the morning.

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

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

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

The most flights from LON to WAS are scheduled on a Wednesday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

How much does it cost to fly round-trip from London to Washington, D.C.?

Reviews of airlines servicing Washington, D.C.

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

Delta

8.0

Very good

7,970 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,970 reviews

Delta

8.0

Very good

7,970 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,366 reviews

Delta

8.0

Very good

7,970 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Austrian Airlines

7.6

Good

809 reviews

Delta

8.0

Very good

7,970 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Finnair

7.6

Good

1,306 reviews

Delta

8.0

Very good

7,970 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

SWISS

7.5

Good

1,654 reviews

Delta

8.0

Very good

7,970 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines flying from London to Washington, D.C. round-trip?
Flying on TAP AIR PORTUGAL is currently your cheapest option to Washington, D.C., with prices starting at $656. Additional round-trip tickets that might be worth considering are offered by JetBlue and SWISS, with the lowest prices starting at $657 and $657, respectively. These flights start at 11% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from London to Washington, D.C. one-way?
One-way options have recently been found by users for as low as $297 on PLAY. Other airlines that offer cheap prices include JetBlue from $526 and TAP AIR PORTUGAL from $537 one-way.
What are the most popular routes from London to Washington, D.C.?
While some choose either London Heathrow - Baltimore/Washington or London Heathrow - Washington, D.C. Reagan-National, London Heathrow - Washington, D.C. Dulles Intl is the most popular route from London to Washington, D.C..
What are the most reliable airlines from London to Washington, D.C.?
Before booking your flight to Washington, D.C. from London, check out the most reliable airlines to get you to your destination on time: Air Canada (76%), Austrian Airlines (76%), Copa Airlines( 76%).
What are the cheapest flights from London to Washington, D.C.?
Looking at all options, your cheapest flight can be booked for $597. While the most popular route (London Heathrow - Washington, D.C. Dulles Intl) can be booked for $466 on average our data indicates $2,041 when flying from London to Washington, D.C..
Can I find deals for flights from London to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on London to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from London to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Washington, D.C..
Can I find deals for business class flights from London to Washington, D.C.?
Yes. Cheapflights offers flight deals from London 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.
What is the cheapest month to book a flight from London to Washington, D.C.?
Currently, August is the cheapest month in which you can book a flight from London to Washington, D.C. (average of $309). Flying from London to Washington, D.C. in July is currently the most expensive (average of $345). 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.

See more FAQs

Arlington

Woodbridge

Alexandria

Tysons

Silver Spring

Fredericksburg

Linthicum Heights

Gaithersburg

Fairfax

Easton

Towson

Waldorf

Laurel

Falls Church

Rockville

Springfield

National Harbor

Manassas

Dundalk

Bowie

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for London to Washington, D.C.

Complete your trip

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

Airline	Cheapest	Average	Flexibility	On-time
PLAY	Cheapest$304	Average$502	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$390	Average$833	FlexibilityNo cancel fee	On-time77%
Austrian Airlines	Cheapest$431	Average$985	FlexibilityNo cancel fee	On-time78%
TAP AIR PORTUGAL	Cheapest$473	Average$752	FlexibilityNo cancel fee	On-timeN/A
Icelandair	Cheapest$510	Average$986	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$595	Average$872	FlexibilityNo cancel fee	On-time70%
American Airlines	Cheapest$619	Average$787	FlexibilityNo cancel fee	On-time71%
Aer Lingus	Cheapest$652	Average$816	FlexibilityNo cancel fee	On-timeN/A
Delta	Cheapest$652	Average$999	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$682	Average$884	FlexibilityNo cancel fee	On-time69%

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$273+ Cheap flights from London (LON) to Washington, D.C. (WAS)

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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from London to Washington, D.C. are usually found in February or November, booked 84 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

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Cheapest flights from London to Washington, D.C.Explore the most affordable flight options available from London to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 3, 2025.

Explore the most affordable flight options available from London to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 3, 2025.

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

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

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

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

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

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

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

Find hourly flight availability from London 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 julio 3, 2025.

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

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

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

How much does it cost to fly round-trip from London to Washington, D.C.?

Reviews of airlines servicing Washington, D.C.

Read through reviews of airlines operating flights from London to Washington, D.C., such as Delta, KLM, and Austrian Airlines. 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 London 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 to Washington, D.C. round-trip?

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

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

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

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

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

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

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

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

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Alternative routes for London to Washington, D.C.

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

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Cheapest flights from London to Washington, D.C.
Explore the most affordable flight options available from London to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 3, 2025.