How does KAYAK find such low prices on flights from Washington to London Heathrow Airport?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to London Heathrow Airport. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London Heathrow Airport?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Washington is likely to change within 7 days, so travellers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Washington to London Heathrow Airport?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Washington with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to London Heathrow Airport?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

£206 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

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Cheap Flights from Washington to Heathrow

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent return flight deals from Washington to Heathrow

Wed, 9 Sep - Wed, 7 Oct

17:21 - 15:05

GEG

LHR

13h 44m

1 stop

17:00 - 13:07

LHR

GEG

28h 07m

1 stop

£629Alaska Airlines

Wed, 9 Sep - Wed, 7 Oct

08:31 - 15:05

GEG

LHR

22h 34m

1 stop

17:00 - 13:07

LHR

GEG

28h 07m

1 stop

£629Alaska Airlines

Wed, 9 Sep - Wed, 7 Oct

13:37 - 12:35

GEG

LHR

14h 58m

1 stop

08:40 - 22:16

LHR

GEG

21h 36m

2 stops

£645United Airlines

Wed, 9 Sep - Wed, 7 Oct

13:37 - 12:35

GEG

LHR

14h 58m

1 stop

08:40 - 22:16

LHR

GEG

21h 36m

2 stops

£648United Airlines

Thu, 20 Aug - Thu, 27 Aug

14:50 - 17:40

SEA

LHR

18h 50m

2 stops

19:30 - 13:45

LHR

SEA

26h 15m

1 stop

£651Scandinavian Airlines

Wed, 14 Oct - Wed, 28 Oct

06:00 - 06:20

GEG

LHR

16h 20m

1 stop

19:40 - 11:58

LHR

GEG

23h 18m

2 stops

£652Iberia

Sun, 19 Jul - Tue, 21 Jul

15:00 - 15:40

SEA

LHR

16h 40m

2 stops

06:30 - 14:22

LHR

SEA

15h 52m

2 stops

£652Lufthansa

Wed, 14 Oct - Wed, 28 Oct

12:45 - 12:50

GEG

LHR

16h 05m

1 stop

19:05 - 11:58

LHR

GEG

23h 53m

2 stops

£653Iberia

Tue, 14 Jul - Mon, 27 Jul

15:40 - 11:55

SEA

LHR

12h 15m

1 stop

21:25 - 11:45

LHR

SEA

22h 20m

1 stop

£653Icelandair

Tue, 11 Aug - Tue, 18 Aug

15:55 - 16:25

SEA

LHR

16h 30m

2 stops

07:05 - 13:45

LHR

SEA

14h 40m

2 stops

£653Scandinavian Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	£206

Best time to beat the crowds (20% less expensive on average)

Most popular time to fly (15% more expensive on average)

Flight from Portland to London Heathrow Airport

MichaelFlew with Delta

SEA

LHR

May 2026

We like Delta, Alaska and American. Be prepared for a bit of a trek from your arrival gate to Customs and outside services. Heathrow doesn't rank high on my list of major airports.

Verified travelerFlew with American Airlines

SEA

LHR

Apr 2026

Heathrow is too gigantic to have less than 2 hours of layover time.

Verified travelerFlew with British Airways

SEA

LHR

Apr 2025

Make sure you have plenty of time between flights if you are delayed.

Verified travelerFlew with British Airways

SEA

LHR

Feb 2025

Don’t take a flight if you sick, or if you have no choice prepare to stay covered with mask throughout the flight

Verified travelerFlew with British Airways

SEA

LHR

Apr 2024

Bring a sack lunch -- airport food was very expensive.

How does KAYAK find such low prices on flights from Washington to London Heathrow Airport?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to London Heathrow Airport.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London Heathrow Airport?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Washington is likely to change within 7 days, so travellers know whether to wait or book now.
What is the Hacker Fare option on flights from Washington to London Heathrow Airport?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Washington with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to London Heathrow Airport?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Gatwick

Milton Keynes

Eastbourne

Hounslow

Luton

Southend-on-Sea

Northampton

Swindon

Slough

Winchester

Stansted

Croydon

Folkestone

Poole

Chichester

Colchester

Maidstone

Salisbury

Chelmsford

Crawley

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London Heathrow Airport (LHR)

£206 Find Cheap Flights from Washington to London Heathrow Airport

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

Cheap Flights from Washington to Heathrow

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Good to know - Cheap tickets from Washington to London Heathrow Airport

Flights from Washington to Heathrow: the best tips from KAYAK users

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