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>

$297 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

$551

Typical prices: $612-$790

Lufthansa

Sun 3/8Sun 3/15

SEA - LHR • 1 stop

Cheapest non-stop

$585

Typical prices: $623-$840

British Airways

Wed 2/18Fri 2/27

SEA - LHR • Non-stop

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KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Heathrow!

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

Sun, Mar 8 - Sun, Mar 15

10:05 am - 11:50 am

SEA

LHR

18h 45m

1 stop

7:40 am - 2:20 pm

LHR

SEA

13h 40m

1 stop

$551Lufthansa

Sun, Feb 8 - Tue, Feb 24

3:40 pm - 11:50 am

SEA

LHR

12h 10m

1 stop

8:15 pm - 1:20 pm

LHR

SEA

25h 05m

1 stop

$552Lufthansa

Sun, Feb 8 - Tue, Feb 24

5:50 am - 7:10 am

SEA

LHR

17h 20m

2 stops

3:00 pm - 10:57 pm

LHR

SEA

15h 57m

2 stops

$556Air Canada

Mon, Feb 16 - Wed, Mar 4

6:50 pm - 12:20 pm

SEA

LHR

9h 30mnonstop

12:10 pm - 6:20 pm

LHR

SEA

14h 10m

1 stop

$562British Airways

Sun, Feb 8 - Tue, Feb 24

5:50 am - 7:10 am

SEA

LHR

17h 20m

2 stops

2:30 pm - 7:22 pm

LHR

SEA

12h 52m

1 stop

$563Air Canada

Tue, Feb 24 - Tue, Mar 10

6:00 am - 6:50 am

GEG

LHR

16h 50m

1 stop

8:50 pm - 9:12 pm

LHR

GEG

31h 22m

2 stops

$578Iberia

Tue, Feb 17 - Wed, Mar 4

6:00 am - 6:50 am

GEG

LHR

16h 50m

1 stop

7:35 am - 9:12 pm

LHR

GEG

21h 37m

2 stops

$581Iberia

Mon, Feb 9 - Wed, Feb 25

5:45 pm - 11:20 am

PDX

LHR

9h 35mnonstop

1:45 pm - 3:55 pm

LHR

PDX

10h 10mnonstop

$595American Airlines

Tue, Feb 10 - Wed, Feb 25

6:00 am - 6:55 am

PDX

LHR

16h 55m

1 stop

1:45 pm - 3:55 pm

LHR

PDX

10h 10mnonstop

$596British Airways

Wed, Mar 4 - Wed, Mar 11

12:25 pm - 11:35 am

GEG

LHR

15h 10m

1 stop

10:15 am - 9:12 pm

LHR

GEG

17h 57m

1 stop

$608American Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$297

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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Eastbourne

Guildford

Kingston upon Thames

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Ipswich

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London Heathrow Airport (LHR)

LHR

$317 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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Cabin class types available on flights to Heathrow

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

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Flights from domestic origins to Washington

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