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 travelers 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 round-trip 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>

$262 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

LHR

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

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Cheapest round-trip

$542

Typical prices: $648-$832

Icelandair

Wed 4/15Fri 4/24

SEA - LHR • 1 stop

Cheapest non-stop

$634

Typical prices: $618-$814

British Airways

Fri 2/27Tue 3/10

SEA - LHR • Non-stop

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Flight Deals

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 round-trip flight deals from Washington to Heathrow

Wed, Apr 15 - Fri, Apr 24

3:40 pm - 11:55 am

SEA

LHR

12h 15m

1 stop

1:05 pm - 5:55 pm

LHR

SEA

12h 50m

1 stop

$542Icelandair

Mon, Mar 16 - Sun, Mar 29

3:35 pm - 9:20 pm

SEA

LHR

22h 45m

2 stops

6:40 am - 5:55 pm

LHR

SEA

43h 15m

2 stops

$543Multiple Airlines

Wed, Feb 25 - Wed, Mar 4

9:50 am - 11:50 am

PDX

LHR

18h 00m

1 stop

11:10 am - 12:34 am

LHR

PDX

21h 24m

2 stops

$596Lufthansa

Mon, Mar 2 - Wed, Mar 18

9:50 am - 10:10 am

PDX

LHR

16h 20m

2 stops

11:10 am - 12:35 am

LHR

PDX

20h 25m

2 stops

$599Lufthansa

Wed, Feb 25 - Wed, Mar 4

6:45 am - 7:05 am

PSC

LHR

16h 20m

1 stop

6:30 am - 8:04 pm

LHR

PSC

21h 34m

2 stops

$631KLM

Wed, Mar 4 - Mon, Mar 9

6:05 am - 10:30 am

GEG

LHR

20h 25m

1 stop

6:30 am - 9:05 pm

LHR

GEG

21h 35m

2 stops

$631Delta

Wed, Mar 11 - Wed, Mar 18

3:05 pm - 12:00 pm

PSC

LHR

13h 55m

1 stop

6:35 am - 8:54 pm

LHR

PSC

21h 19m

2 stops

$633United Airlines

Wed, Mar 11 - Thu, Mar 19

7:02 am - 12:00 pm

GEG

LHR

21h 58m

1 stop

6:35 am - 9:18 pm

LHR

GEG

21h 43m

2 stops

$633United Airlines

Wed, Feb 25 - Wed, Mar 4

5:05 am - 10:30 am

PSC

LHR

21h 25m

1 stop

6:30 am - 8:04 pm

LHR

PSC

21h 34m

2 stops

$634KLM

Tue, Feb 24 - Tue, Mar 10

11:22 am - 11:55 am

GEG

LHR

16h 33m

1 stop

6:30 am - 9:29 pm

LHR

GEG

21h 59m

2 stops

$634Delta

Useful Info

Low season	January
High season	July
Cheapest flight	$262

Best time to beat the crowds with an average 10% drop in price.

Most popular time to fly with an average 18% increase in price.

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 travelers 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 round-trip 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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Salisbury

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Ipswich

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London Heathrow Airport (LHR)

LHR

$262 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 round-trip flight deals from Washington to Heathrow

Recent one-way flight deals from Washington to Heathrow

Recent last minute flight deals from Washington to Heathrow

Recent direct flight deals from Washington to Heathrow

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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 travelers 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 round-trip 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.

Traveling to a place near Heathrow?

Everything you need to know for your flight to Heathrow

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Complete your trip to Heathrow with a hotel stay or car rental

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