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>

£190 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

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

...and more

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Cheapest return fare

£393

Typical prices: £470-£603

Icelandair

Wed 15/4Fri 24/4

SEA - LHR • 1 stop

Cheapest direct flights

£460

Typical prices: £448-£590

British Airways

Fri 27/2Tue 10/3

SEA - LHR • Direct

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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, 15 Apr - Fri, 24 Apr

15:40 - 11:55

SEA

LHR

12h 15m

1 stop

13:05 - 17:55

LHR

SEA

12h 50m

1 stop

£393Icelandair

Mon, 16 Mar - Sun, 29 Mar

15:35 - 21:20

SEA

LHR

22h 45m

2 stops

06:40 - 17:55

LHR

SEA

43h 15m

2 stops

£394Multiple Airlines

Wed, 1 Apr - Sun, 12 Apr

15:40 - 11:55

SEA

LHR

12h 15m

1 stop

21:25 - 20:40

LHR

SEA

31h 15m

1 stop

£394Icelandair

Wed, 25 Feb - Wed, 4 Mar

09:50 - 11:50

PDX

LHR

18h 00m

1 stop

11:10 - 00:34

LHR

PDX

21h 24m

2 stops

£432Lufthansa

Mon, 2 Mar - Wed, 18 Mar

09:50 - 10:10

PDX

LHR

16h 20m

2 stops

11:10 - 00:35

LHR

PDX

20h 25m

2 stops

£434Lufthansa

Tue, 24 Feb - Tue, 3 Mar

09:50 - 11:50

PDX

LHR

18h 00m

1 stop

06:30 - 18:55

LHR

PDX

20h 25m

2 stops

£441Lufthansa

Wed, 4 Mar - Mon, 9 Mar

06:05 - 10:30

GEG

LHR

20h 25m

1 stop

06:30 - 21:05

LHR

GEG

21h 35m

2 stops

£457Delta

Wed, 11 Mar - Wed, 18 Mar

15:05 - 12:00

PSC

LHR

13h 55m

1 stop

06:35 - 20:54

LHR

PSC

21h 19m

2 stops

£459United Airlines

Wed, 11 Mar - Wed, 18 Mar

06:00 - 05:55

GEG

LHR

16h 55m

1 stop

06:35 - 21:18

LHR

GEG

21h 43m

2 stops

£459United Airlines

Tue, 24 Feb - Tue, 10 Mar

11:22 - 11:55

GEG

LHR

16h 33m

1 stop

06:30 - 21:29

LHR

GEG

21h 59m

2 stops

£460Delta

Useful Info

Low season	January
High season	July
Cheapest flight	£190

Best time to beat the crowds (6% less expensive on average)

Most popular time to fly (8% more expensive on average)

Flight from Portland to London Heathrow Airport

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.

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London Heathrow Airport (LHR)

£190 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

Everything you should know

Cheap Flights from Washington to Heathrow

Recent return flight deals from Washington to Heathrow

Recent one-way flight deals from Washington to Heathrow

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Recent direct flight deals from Washington to Heathrow

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

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

FAQs for booking Washington to London Heathrow Airport flights

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.

Travelling to a place near Heathrow?

Everything you need to know for your flight to Heathrow

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