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>

£210 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

Mon, 28 Sep - Thu, 1 Oct

15:54 - 09:40

GEG

LHR

33h 46m

1 stop

08:45 - 10:30

LHR

GEG

33h 45m

2 stops

£569United Airlines

Mon, 28 Sep - Thu, 1 Oct

15:54 - 10:00

GEG

LHR

34h 06m

2 stops

08:45 - 10:30

LHR

GEG

33h 45m

2 stops

£571United Airlines

Mon, 28 Sep - Thu, 1 Oct

15:54 - 10:00

GEG

LHR

34h 06m

2 stops

08:45 - 10:30

LHR

GEG

33h 45m

2 stops

£572United Airlines

Wed, 9 Sep - Wed, 7 Oct

13:36 - 15:05

GEG

LHR

17h 29m

1 stop

17:00 - 13:07

LHR

GEG

28h 07m

1 stop

£628Alaska Airlines

Wed, 9 Sep - Wed, 7 Oct

07:03 - 15:05

GEG

LHR

24h 02m

1 stop

17:00 - 11:39

LHR

GEG

26h 39m

1 stop

£629Alaska Airlines

Fri, 18 Sep - Sat, 26 Sep

11:10 - 13:35

GEG

LHR

18h 25m

2 stops

17:00 - 17:00

LHR

GEG

32h 00m

2 stops

£631Scandinavian Airlines

Tue, 8 Sep - Tue, 15 Sep

12:35 - 16:00

PSC

LHR

19h 25m

2 stops

06:40 - 23:54

LHR

PSC

25h 14m

2 stops

£651Scandinavian Airlines

Mon, 5 Oct - Tue, 13 Oct

15:24 - 15:35

PSC

LHR

16h 11m

1 stop

06:30 - 16:18

LHR

PSC

17h 48m

2 stops

£652KLM

Mon, 5 Oct - Tue, 13 Oct

12:30 - 12:10

PSC

LHR

15h 40m

1 stop

06:30 - 19:52

LHR

PSC

21h 22m

2 stops

£653Delta

Mon, 5 Oct - Tue, 13 Oct

06:05 - 07:10

PSC

LHR

17h 05m

2 stops

06:30 - 19:52

LHR

PSC

21h 22m

2 stops

£656Delta

Useful Info

Low season	January
High season	July
Cheapest flight	£210

Best time to beat the crowds (16% less expensive on average)

Most popular time to fly (5% 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

Recent return flight deals from Washington to Heathrow

Recent one-way flight deals from Washington to Heathrow

Recent last minute flight deals 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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Everything you need to know for your flight to Heathrow

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