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Cheap flights from London Heathrow Airport to Washington from $434

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Washington departing on 3/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London Heathrow Airport to Washington

Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
8:35 pm - 5:00 pm
LHR
-
SEA
28h 25m
1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m
1 stop
$482Icelandair
Tue, Feb 24 - Tue, Mar 3
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m
1 stop
Icelandair Logo
3:35 pm - 7:30 pm
SEA
-
LHR
20h 55m
1 stop
$485Icelandair
Wed, Feb 25 - Wed, Mar 11
Delta Logo
10:55 am - 6:29 pm
LHR
-
SEA
15h 34m
1 stop
Delta Logo
9:45 pm - 3:35 pm
SEA
-
LHR
9h 50mnonstop
$486Delta
Tue, May 12 - Sun, May 31
Icelandair Logo
8:35 pm - 5:00 pm
LHR
-
SEA
28h 25m
1 stop
Icelandair Logo
3:40 pm - 11:55 am
SEA
-
LHR
12h 15m
1 stop
$487Icelandair
Sun, Mar 1 - Sun, Mar 29
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m
1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m
1 stop
$491Icelandair
Tue, Feb 10 - Wed, Feb 25
Icelandair Logo
8:35 pm - 5:00 pm
LHR
-
SEA
28h 25m
1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m
1 stop
$492Icelandair
Sun, Mar 1 - Thu, Mar 5
Multiple Airlines Logo
6:35 am - 2:20 pm
LHR
-
SEA
14h 45m
1 stop
Multiple Airlines Logo
7:00 am - 5:55 am
SEA
-
LHR
15h 55m
1 stop
$494Multiple Airlines
Wed, Mar 11 - Wed, Mar 18
SWISS Logo
9:00 am - 11:30 pm
LHR
-
SEA
22h 30m
2 stops
SWISS Logo
12:36 pm - 12:00 pm
SEA
-
LHR
16h 24m
1 stop
$496SWISS
Wed, Feb 25 - Mon, Mar 9
Multiple Airlines Logo
8:55 am - 8:33 pm
LHR
-
PDX
19h 38m
1 stop
Multiple Airlines Logo
7:05 am - 6:55 am
PDX
-
LHR
16h 50m
1 stop
$707Multiple Airlines
Wed, Feb 25 - Wed, Mar 11
Virgin Atlantic Logo
11:05 am - 5:33 pm
LHR
-
PDX
14h 28m
1 stop
Virgin Atlantic Logo
7:35 pm - 10:30 am
PDX
-
LHR
30h 55m
1 stop
$727Virgin Atlantic
Mon, Feb 16 - Sun, Feb 22

Air Canada flights from London Heathrow Airport to State of Washington

Our best Air Canada deals on London Heathrow Airport to State of Washington flight tickets
Air Canada
Feb 23
LHR2:30 pmLondon Heathrow
16h 27m
1 stop
SEA10:57 pmSeattle/Tacoma Intl
Mar 7
SEA5:50 amSeattle/Tacoma Intl
44h 20m
2 stops
LHR10:10 amLondon Heathrow
$530
Air Canada
Feb 16
LHR1:25 pmLondon Heathrow
27h 50m
2 stops
SEA9:15 amSeattle/Tacoma Intl
Feb 23
SEA5:45 amSeattle/Tacoma Intl
17h 25m
2 stops
LHR7:10 amLondon Heathrow
$536
Air Canada
Feb 24
LHR2:30 pmLondon Heathrow
32h 01m
1 stop
SEA2:31 pmSeattle/Tacoma Intl
Mar 10
SEA5:40 amSeattle/Tacoma Intl
21h 30m
2 stops
LHR10:10 amLondon Heathrow
$537

KLM flights from London Heathrow Airport to State of Washington

Our best KLM deals on London Heathrow Airport to State of Washington flight tickets
KLM
Feb 4
LHR6:30 amLondon Heathrow
13h 10m
1 stop
SEA11:40 amSeattle/Tacoma Intl
Feb 9
SEA4:55 pmSeattle/Tacoma Intl
9h 35m
LHR10:30 amLondon Heathrow
$528
KLM
Feb 23
LHR2:30 pmLondon Heathrow
10h 05m
SEA4:35 pmSeattle/Tacoma Intl
Mar 10
SEA5:40 pmSeattle/Tacoma Intl
9h 50m
LHR10:30 amLondon Heathrow
$535
KLM
Feb 4
LHR12:20 pmLondon Heathrow
10h 25m
SEA2:45 pmSeattle/Tacoma Intl
Feb 9
SEA4:55 pmSeattle/Tacoma Intl
9h 35m
LHR10:30 amLondon Heathrow
$545

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport to State of Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 2/24

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Tue 3/3

2:35 pm-10:50 am

1 stop12h 15m

$482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 2/25

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Wed 3/11

3:35 pm-7:30 pm

1 stop20h 55m

$485

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 5/12

10:55 am-6:29 pm

1 stop15h 34m

Seattle/Tacoma Intl

Sun 5/31

9:45 pm-3:35 pm

Nonstop9h 50m

$486

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 3/1

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Sun 3/29

3:40 pm-11:55 am

1 stop12h 15m

$487

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 2/10

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Wed 2/25

2:35 pm-10:50 am

1 stop12h 15m

$491

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 3/1

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Thu 3/5

2:35 pm-10:50 am

1 stop12h 15m

$492

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 3/11

6:35 am-2:20 pm

1 stop14h 45m

Seattle/Tacoma Intl

Wed 3/18

7:00 am-5:55 am

1 stop15h 55m

$494

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 2/25

9:00 am-11:30 pm

2 stops22h 30m

Seattle/Tacoma Intl

Mon 3/9

12:36 pm-12:00 pm

1 stop16h 24m

$496

LondonPortland

LHR - PDX

LHRPDX

London Heathrow

Wed 2/25

8:55 am-8:33 pm

1 stop19h 38m

Portland

Wed 3/11

7:05 am-6:55 am

1 stop16h 50m

$707

LondonPortland

LHR - PDX

LHRPDX

London Heathrow

Mon 2/16

11:05 am-5:33 pm

1 stop14h 28m

Portland

Sun 2/22

7:35 pm-10:30 am

1 stop30h 55m

$727

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington from

How to get the cheapest flight ticket from London Heathrow Airport to State of Washington

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to State of Washington?

The month of February is, on average, the cheapest month to fly to State of Washington from London Heathrow Airport, with most prices found around $609. If you aren’t able to travel to State of Washington during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $681.

What is the cheapest day to depart on your flight to State of Washington?

The cheapest day to depart from London Heathrow Airport to State of Washington is on a Wednesday. Travelers who choose to depart for State of Washington on a Wednesday will often find tickets for as low as $761. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to State of Washington for around $1,012.

What is the cheapest time of day to depart on your flight to State of Washington?

The cheapest time of day to fly to State of Washington is in the afternoon when flights can be purchased for as low as $816. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $856 on average. Flights to State of Washington from London Heathrow Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest London Heathrow to Washington flight route?

Fly from London Heathrow to Seattle/Tacoma Intl for the best London Heathrow - Washington flight prices

How far in advance should I book a flight to State of Washington?

You are more likely to see cheaper flights to State of Washington from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around $752 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from London Heathrow Airport for as low as $702 on momondo.

What cabin class options are available on London Heathrow to Washington flights?

There are 4 cabin classes available to choose from on London Heathrow to Washington flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London Heathrow Airport to State of Washington flights?

You could potentially save up to 3% on your flight if you consider stops on a London Heathrow Airport to State of Washington flight.

Cheap London Heathrow Airport to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to State of Washington

Best Price Found

$609

Fastest flight time

9h 45m

Direct flights

Every day

Airports in State of Washington

96 airports
The best one-way flight to State of Washington from London Heathrow Airport in the past 72 hours is $609. The best round-trip flight deal from London Heathrow Airport to State of Washington found on momondo in the last 72 hours is $593.
The fastest flight from London Heathrow Airport to State of Washington takes 9h 45m
Direct flights go from London Heathrow Airport to State of Washington every day.
There are 96 airports in State of Washington. From London Heathrow Airport there are direct flights to Portland (PDX), Seattle/Tacoma Intl (SEA).
Search flight deals

  • When did momondo last update prices for flights from London Heathrow Airport to Washington?

    Prices for flights from London Heathrow Airport to Washington refresh daily.

  • How many operators does momondo search for flights from London Heathrow Airport to Washington?

  • How old do you have to be to fly from London Heathrow Airport to Washington?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Washington.

  • What documentation or ID do you need to fly to Washington?

    The required travel and health documents for your Washington trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from London Heathrow Airport to State of Washington?

Best airlines flying from London Heathrow Airport to State of Washington

Compare and see reviews for airlines that fly from London Heathrow Airport to State of Washington with momondo
Airline
Rating
Free Cancellation
Price
Virgin AtlanticPriceFrom $574Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
DeltaPriceFrom $575Free CancellationRating
7.9
8,125 reviews
Search Delta flights
American AirlinesPriceFrom $589Free CancellationRating
7.2
11,199 reviews
Search American Airlines flights
British AirwaysPriceFrom $625Free CancellationRating
6.7
7,705 reviews
Search British Airways flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Washington?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Washington for you.

Can I find flights from London to Washington with flexible booking policies on momondo?

Flights from London to Washington with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Washington?

momondo provides multiple filters to help you find the best flight to Washington from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Washington right now. Can momondo alert me if prices change?

If you are not ready to book a flight from London to Washington now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington and let you know when they change.

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