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

TAP AIR PORTUGAL, at £400, was found to be the cheapest airline from Washington, D.C. to London.Alternate airlines flying return to your destination include Delta and SWISS. These flights start at 26% lower than the current average price 3 months from now.

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

The cheapest airline one-way is PLAY, with whom users have recently found tickets for as low as £140. However, be on the lookout for offers from Icelandair and JetBlue, as they are both options that can get you from Washington, D.C. to London for a low price.

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

Travellers seeking maximum savings on their Washington, D.C. to London 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.

In terms of precipitation, rainfall in London 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 when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, 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).

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

The most popular route from Washington, D.C. to London is Washington, D.C. Dulles Intl - London Heathrow. You may also consider Baltimore/Washington - London Heathrow or Washington, D.C. Dulles Intl - London Gatwick.

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

Looking at all options, your cheapest flight can be booked for £263. While the most popular route (Washington, D.C. Dulles Intl - London Heathrow) can be booked for £310 on average our data indicates £1,102 when flying from Washington, D.C. to London.

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

Before booking your flight to London from Washington, D.C., check out the most reliable airlines to get you to your destination on time: KLM (68%), Air France (68%), Delta( 68%).

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

Before booking your flight from Washington, D.C. to London check out the most popular airlines for this route: Air France, British Airways or Icelandair.

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

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 16% on the overall cost on flights from Washington, D.C. to London.

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

Find a great deal and save up to 37% by booking at least 48 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 Washington, D.C. to London within the next two weeks, with the cheapest ticket starting at £590.

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

January is one of the best times of the year to fly to London from Washington, D.C.. Prices for January average £545 per person but you can even find prices for as low as £283. 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

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

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

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

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 London.

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

Yes. Cheapflights offers flight deals from Washington, D.C. to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£130+ Flights from Washington, D.C. to London

Cheapflights Tip: The best prices from Washington, D.C. to London are usually found in January or October, booked 70 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

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

Round-trip from	£400
One-way from	£130
Popular in	June
Cheapest in	January
Average price	£624
Good round-trip deal	£451 or less
Good one-way deal	£299 or less

TAP AIR PORTUGAL
18/8-26/8
3 total stops
32h 20m total
Washington, D.C. to London

Search Deals

10/8
1 total stop
30h 17m total
Washington, D.C. to London

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£59 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

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

Search Deals

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

Search Deals

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

Cheapest flights from Washington, D.C. to London
Explore the most affordable flight options available from Washington, D.C. to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 July 2025.

Mon 18/822:20IAD - LGW

2 stops17h 05mTAP AIR PORTUGAL

Tue 26/810:35LGW - IAD

1 stop15h 15mTAP AIR PORTUGAL

Deal found 11/7£400

Sun 31/817:50IAD - LHR

Nonstop7h 30mDelta

Tue 21/1008:40LHR - IAD

1 stop11h 55mDelta

Deal found 10/7£400

Mon 25/822:20IAD - LTN

2 stops18h 05mMultiple Airlines

Mon 1/909:00LTN - IAD

2 stops35h 20mMultiple Airlines

Deal found 10/7£400

Tue 2/917:00IAD - STN

2 stops16h 20mMultiple Airlines

Tue 9/910:45STN - IAD

2 stops33h 35mMultiple Airlines

Deal found 11/7£401

Tue 2/917:00IAD - LGW

2 stops23h 15mMultiple Airlines

Tue 9/908:50LGW - IAD

2 stops35h 30mMultiple Airlines

Deal found 11/7£401

Mon 22/920:45IAD - LCY

1 stop10h 45mSWISS

Tue 30/909:25LCY - IAD

1 stop11h 50mSWISS

Deal found 10/7£401

Sun 31/817:46DCA - LHR

1 stop9h 04mIberia

Thu 11/909:15LHR - DCA

2 stops18h 52mIberia

Deal found 10/7£401

Wed 8/1019:25IAD - LHR

Nonstop7h 20mBritish Airways

Mon 13/1014:30LHR - IAD

Nonstop8h 05mBritish Airways

Deal found 10/7£401

Wed 3/912:20DCA - LGW

2 stops16h 40mVirgin Atlantic

Mon 8/912:00LGW - DCA

1 stop16h 41mVirgin Atlantic

Deal found 10/7£401

Sun 31/818:04IAD - LHR

1 stop13h 41mIberia

Wed 15/1020:00LHR - IAD

1 stop24h 00mIberia

Deal found 10/7£402

Tue 16/918:45DCA - LHR

1 stop10h 15mAir Canada

Tue 30/906:50LHR - DCA

2 stops14h 01mAir Canada

Deal found 9/7£403

Tue 16/912:55DCA - LGW

3 stops17h 50mMultiple Airlines

Tue 23/906:00LGW - DCA

2 stops20h 51mMultiple Airlines

Deal found 9/7£403

Best flights from Washington, D.C. to London
Discover carefully curated flight deals from Washington, D.C. to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 11 July 2025.

Mon 18/822:20IAD - LGW

2 stops17h 05mTAP AIR PORTUGAL

Tue 26/810:35LGW - IAD

1 stop15h 15mTAP AIR PORTUGAL

Deal found 11/7£400

Wed 17/917:50IAD - LHR

Nonstop7h 30mDelta

Tue 23/908:40LHR - IAD

1 stop11h 55mDelta

Deal found 10/7£400

Mon 25/822:20IAD - LTN

2 stops18h 05mMultiple Airlines

Mon 1/909:00LTN - IAD

2 stops35h 20mMultiple Airlines

Deal found 10/7£400

Mon 22/920:45IAD - LCY

1 stop10h 45mSWISS

Tue 30/909:25LCY - IAD

1 stop11h 50mSWISS

Deal found 10/7£401

Sun 31/817:46DCA - LHR

1 stop9h 04mIberia

Thu 11/909:15LHR - DCA

2 stops18h 52mIberia

Deal found 10/7£401

Wed 8/1017:50IAD - LHR

Nonstop7h 25mBritish Airways

Mon 13/1017:00LHR - IAD

Nonstop8h 15mBritish Airways

Deal found 11/7£401

Wed 3/913:40DCA - LGW

2 stops15h 20mVirgin Atlantic

Mon 8/912:00LGW - DCA

2 stops16h 46mVirgin Atlantic

Deal found 10/7£401

Tue 16/918:45DCA - LHR

1 stop10h 15mAir Canada

Tue 30/906:50LHR - DCA

2 stops14h 01mAir Canada

Deal found 9/7£403

Fri 19/909:35IAD - LHR

1 stop15h 55mUnited Airlines

Tue 23/908:45LHR - IAD

1 stop12h 30mUnited Airlines

Deal found 10/7£405

Sun 10/814:54DCA - LGW

1 stop11h 56mAmerican Airlines

Wed 20/815:05LGW - DCA

1 stop13h 13mAmerican Airlines

Deal found 9/7£409

Sat 23/820:30IAD - LGW

1 stop10h 15mIcelandair

Sat 30/813:00LGW - IAD

1 stop14h 10mIcelandair

Deal found 9/7£411

Tue 19/817:25IAD - LCY

1 stop10h 25mKLM

Tue 26/808:40LCY - IAD

1 stop11h 55mKLM

Deal found 9/7£414

Direct flights from Washington, D.C. to London
Explore direct flight options from Washington, D.C. to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 11 July 2025.

Wed 17/922:40IAD - LHR

Nonstop7h 25mBritish Airways

Wed 24/912:45LHR - IAD

Nonstop8h 15mBritish Airways

Deal found 10/7£400

Fri 26/917:50IAD - LHR

Nonstop7h 30mVirgin Atlantic

Tue 30/912:35LHR - IAD

Nonstop8h 25mVirgin Atlantic

Deal found 10/7£405

Sun 31/818:35IAD - LHR

Nonstop7h 20mUnited Airlines

Fri 12/912:15LHR - IAD

Nonstop8h 15mUnited Airlines

Deal found 10/7£405

Mon 1/1218:20IAD - LHR

Nonstop7h 10mIberia

Sun 14/1212:10LHR - IAD

Nonstop8h 25mIberia

Deal found 9/7£415

Sun 10/817:50IAD - LHR

Nonstop7h 30mMultiple Airlines

Tue 19/812:35LHR - IAD

Nonstop8h 25mMultiple Airlines

Deal found 10/7£416

Fri 26/917:50IAD - LHR

Nonstop7h 30mDelta

Fri 3/1012:35LHR - IAD

Nonstop8h 25mDelta

Deal found 10/7£417

Fri 8/822:20IAD - LHR

Nonstop7h 20mLufthansa

Sun 31/812:15LHR - IAD

Nonstop8h 20mLufthansa

Deal found 9/7£422

Sun 21/921:20BWI - LHR

Nonstop7h 30mBritish Airways

Tue 30/916:35LHR - BWI

Nonstop8h 00mBritish Airways

Deal found 9/7£451

Tue 19/821:20BWI - LHR

Nonstop7h 15mAmerican Airlines

Tue 26/816:35LHR - BWI

Nonstop8h 00mAmerican Airlines

Deal found 9/7£472

Last-minute flights from Washington, D.C. to London
Discover last-minute flight deals from Washington, D.C. to London. Data last updated 11 July 2025 and is based on user searches.

Wed 16/720:33IAD - LHR

1 stop9h 52mDelta

Fri 22/806:15LHR - IAD

1 stop15h 05mDelta

Deal found 9/7£403

Wed 16/709:40DCA - LHR

1 stop19h 20mUnited Airlines

Tue 22/709:30LHR - DCA

1 stop29h 48mUnited Airlines

Deal found 9/7£430

Sat 19/720:06IAD - LHR

1 stop30h 34mBritish Airways

Thu 31/717:00LHR - IAD

Nonstop8h 10mBritish Airways

Deal found 8/7£414

Sun 20/716:30DCA - LHR

1 stop12h 30mAir Canada

Thu 31/709:30LHR - DCA

1 stop17h 18mAir Canada

Deal found 9/7£405

Sun 20/708:18IAD - LHR

2 stops17h 12mAir Canada

Tue 29/712:40LHR - IAD

2 stops25h 57mAir Canada

Deal found 10/7£411

Sun 20/718:44IAD - LHR

1 stop14h 41mIberia

Fri 8/816:25LHR - IAD

1 stop23h 36mIberia

Deal found 8/7£417

Sun 20/717:25IAD - LCY

1 stop11h 05mDelta

Thu 21/807:45LCY - IAD

1 stop12h 50mDelta

Deal found 9/7£419

Sun 20/714:54DCA - LHR

1 stop11h 51mIberia

Sat 23/817:00LHR - DCA

1 stop11h 18mIberia

Deal found 9/7£429

Mon 21/717:31IAD - LHR

1 stop31h 59mUnited Airlines

Tue 12/812:15LHR - IAD

Nonstop8h 20mUnited Airlines

Deal found 9/7£405

Mon 21/706:00DCA - LHR

1 stop10h 40mBritish Airways

Mon 28/721:35LHR - DCA

2 stops27h 20mBritish Airways

Deal found 9/7£408

Mon 21/713:27IAD - LGW

1 stop15h 33mMultiple Airlines

Sat 23/810:00LGW - IAD

1 stop14h 24mMultiple Airlines

Deal found 9/7£416

Mon 21/714:55DCA - LHR

1 stop10h 50mDelta

Tue 12/809:40LHR - DCA

1 stop11h 20mDelta

Deal found 9/7£416

One-way flights from Washington, D.C. to London
Search for one-way flight options from Washington, D.C. to London. Find affordable one-way fares based on user searches. Data last updated 11 July 2025.

Sun 10/819:38BWI - LGW

1 stop30h 17mMultiple Airlines

Deal found 9/7£130

Sat 26/718:50BWI - STN

1 stop10h 50mPLAY

Deal found 9/7£140

Sat 11/1020:30BWI - LHR

1 stop10h 25mIcelandair

Deal found 9/7£155

Wed 15/1020:30BWI - LGW

1 stop13h 10mIcelandair

Deal found 10/7£164

Sun 17/819:38BWI - LHR

2 stops33h 42mMultiple Airlines

Deal found 9/7£169

Tue 5/818:50BWI - STN

2 stops16h 45mMultiple Airlines

Deal found 8/7£191

Mon 18/822:20IAD - LGW

2 stops29h 55mMultiple Airlines

Deal found 9/7£196

Sun 20/716:30IAD - STN

1 stop34h 10mMultiple Airlines

Deal found 10/7£196

Wed 23/711:00DCA - LGW

2 stops28h 40mMultiple Airlines

Deal found 10/7£196

Sat 11/1023:15IAD - LHR

1 stop31h 40mIcelandair

Deal found 9/7£197

Sat 2/821:43IAD - LHR

2 stops41h 37mMultiple Airlines

Deal found 10/7£198

Fri 8/806:30DCA - LHR

1 stop22h 00mJetBlue

Deal found 9/7£200

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 18/8

22:20-20:25

2 stops17h 05m

London Gatwick

Tue 26/8

10:35-20:50

1 stop15h 15m

£400

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 17/9

17:50-06:20

Nonstop7h 30m

London Heathrow

Tue 23/9

08:40-15:35

1 stop11h 55m

£400

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Mon 25/8

22:20-21:25

2 stops18h 05m

London Luton

Mon 1/9

09:00-15:20

2 stops35h 20m

£400

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Mon 22/9

20:45-12:30

1 stop10h 45m

London City

Wed 1/10

09:25-16:15

1 stop11h 50m

£401

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Sun 31/8

17:46-07:50

1 stop9h 04m

London Heathrow

Thu 11/9

09:15-23:07

2 stops18h 52m

£401

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/10

17:50-06:15

Nonstop7h 25m

London Heathrow

Mon 13/10

17:00-20:15

Nonstop8h 15m

£401

Washington, D.C.London

DCA - LGW

DCALGW

Washington, D.C. Reagan-National

Wed 3/9

13:40-10:00

2 stops15h 20m

London Gatwick

Mon 8/9

12:00-23:46

2 stops16h 46m

£401

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Tue 2/9

17:00-14:20

2 stops16h 20m

London Stansted

Tue 9/9

10:45-15:20

2 stops33h 35m

£401

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 31/8

18:04-12:45

1 stop13h 41m

London Heathrow

Wed 15/10

20:00-15:00

1 stop24h 00m

£402

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Tue 16/9

18:45-10:00

1 stop10h 15m

London Heathrow

Tue 30/9

06:50-15:51

2 stops14h 01m

£403

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 60 results

...

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

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

Estimated return 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 Washington, D.C. to London

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

The best time to book flights from Washington, D.C. to London is 70 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.

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

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

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

It’s optimal to fly from Washington, D.C. to London in the afternoon. By choosing this option you can save up to 61% on the cost of your flight, compared to a flight in the morning.

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

The most flights from WAS to LON are scheduled on a Wednesday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).

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

Reviews of airlines servicing London

Read reviews from past customers who have flown with Delta, KLM, andFinnair from Washington, D.C. to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,951 reviews

Check prices

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

7,951 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

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

1,372 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

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

1,312 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

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

1,655 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

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!

United Airlines

7.4

Good

8,846 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

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 Washington, D.C. to London round-trip?
TAP AIR PORTUGAL, at £400, was found to be the cheapest airline from Washington, D.C. to London.Alternate airlines flying return to your destination include Delta and SWISS. These flights start at 26% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. to London one-way?
The cheapest airline one-way is PLAY, with whom users have recently found tickets for as low as £140. However, be on the lookout for offers from Icelandair and JetBlue, as they are both options that can get you from Washington, D.C. to London for a low price.
What are the most popular routes from Washington, D.C. to London?
The most popular route from Washington, D.C. to London is Washington, D.C. Dulles Intl - London Heathrow. You may also consider Baltimore/Washington - London Heathrow or Washington, D.C. Dulles Intl - London Gatwick.
What are the most reliable airlines from Washington, D.C. to London?
Before booking your flight to London from Washington, D.C., check out the most reliable airlines to get you to your destination on time: KLM (68%), Air France (68%), Delta( 68%).
What are the cheapest flights from Washington, D.C. to London?
Looking at all options, your cheapest flight can be booked for £263. While the most popular route (Washington, D.C. Dulles Intl - London Heathrow) can be booked for £310 on average our data indicates £1,102 when flying from Washington, D.C. to London.
Can I find deals for flights from Washington, D.C. to London that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to London?
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 London.
Can I find deals for business class flights from Washington, D.C. to London?
Yes. Cheapflights offers flight deals from Washington, D.C. to London 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 Washington, D.C. to London?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to London (average of £112). Flying from Washington, D.C. to London 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.

See more FAQs

Hounslow

Croydon

Milton Keynes

Deal

Gatwick

Slough

Luton

Wembley

Crawley

Eastbourne

Ilford

Hayes

Ipswich

Folkestone

Southend-on-Sea

Watford

Winchester

Maidstone

Guildford

Chichester

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Washington, D.C. to London

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

Airline	Cheapest	Average	Flexibility	On-time
PLAY	Cheapest£302	Average£606	FlexibilityNo cancel fee	On-timeN/A	Search PLAY flights
Icelandair	Cheapest£337	Average£654	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£392	Average£534	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£399	Average£745	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Iberia	Cheapest£410	Average£539	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Virgin Atlantic	Cheapest£429	Average£634	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£442	Average£561	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£454	Average£544	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£481	Average£618	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
American Airlines	Cheapest£488	Average£710	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

Fly with Cheapflights

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington, D.C. to London. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Washington, D.C. to London.

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

Certainly. Search results for flights to London from Washington, D.C. shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to London from Washington, D.C. today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Washington, D.C. to London from £130

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 10/8. 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 are usually found in January or October, booked 70 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

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

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 London

Cheapest flights from Washington, D.C. to LondonExplore the most affordable flight options available from Washington, D.C. to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 July 2025.

Explore the most affordable flight options available from Washington, D.C. to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 July 2025.

Cheapflights Fare Finder

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

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

Have a flexible travel schedule? Discover the best time to fly to London 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

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

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

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

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

Find hourly flight availability from Washington, D.C. to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 July 2025.

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

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

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 11 July 2025.

Read reviews from past customers who have flown with Delta, KLM, andFinnair from Washington, D.C. to London. Users can see the overall rating for each airline as well as how each is rated 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 London. 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 round-trip?

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

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

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

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

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

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

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

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

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 London

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

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

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 London?

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

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

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

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Washington, D.C. to London
Explore the most affordable flight options available from Washington, D.C. to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 July 2025.