Cheap flights from London Heathrow Airport to Washington from £387

LHR — SEA
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Washington

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Washington

Tue 10/1106:20 -
1 stop15h 30m
Wed 25/1115:25 -
1 stop14h 20m
Deal found 28/10£404
Fri 13/1106:35 -
1 stop14h 25m
Sun 29/1114:50 -
1 stop17h 00m
Deal found 29/10£405
Mon 14/1212:20 -
Nonstop10h 30m
Sat 9/107:20 -
1 stop15h 30m
Deal found 29/10£406
Mon 14/1212:20 -
Nonstop10h 30m
Fri 8/116:55 -
Nonstop9h 45m
Deal found 28/10£407
Thu 10/1212:20 -
Nonstop10h 30m
Mon 18/116:55 -
Nonstop9h 45m
Deal found 30/10£407
Tue 17/1114:30 -
1 stop32h 07m
Tue 24/1115:15 -
1 stop12h 35m
Deal found 27/10£408
Thu 10/1208:40 -
1 stop35h 10m
Wed 6/106:00 -
1 stop17h 05m
Deal found 28/10£409
Sat 12/1209:50 -
1 stop15h 40m
Thu 7/107:20 -
1 stop15h 30m
Deal found 29/10£410
Sat 12/1209:50 -
1 stop15h 40m
Mon 18/116:55 -
Nonstop9h 45m
Deal found 30/10£411
Mon 16/1111:20 -
1 stop15h 17m
Sat 21/1123:07 -
1 stop26h 48m
Deal found 27/10£412
Wed 16/1206:30 -
2 stops18h 40m
Sat 9/111:00 -
1 stop15h 00m
Deal found 29/10£413
Thu 10/1214:45 -
1 stop14h 20m
Thu 24/1213:29 -
1 stop14h 51m
Deal found 29/10£622

Find flight deals from Heathrow to Washington

Round-trip from

£404

One-way from

£387

Popular in

August

Cheapest in

February

Average price

£531

Good round-trip deal

£423 or less

Good one-way deal

£390 or less
British Airways
  • British Airways
  • 12/4-21/4
  • 1 total stop
  • 22h 35m total
  • London to Washington
8/12-31/12
  • 8/12-31/12
  • 3 total stops
  • 50h 05m total
  • London to Washington
Highest demand for flights based on searches. 7% potential increase in price (£35 potential increase over avg. return price).
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Average for round-trip flights in October 2026
Price to beat on a round-trip flight from London Heathrow to Washington.
Price to beat on a one-way flight from London Heathrow to Washington.

Cheapflights Fare Finder

 
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

Cheapest return flight

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 16/12

09:50-17:10

1 stop15h 20m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£396

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 8/12

07:40-23:44

3 stops24h 04m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£404

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 13/11

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Thu 3/12

16:50-10:40

Nonstop9h 50m

£406

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 5/11

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Thu 19/11

08:30-07:05

1 stop14h 35m

£407

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 27/11

06:30-11:47

1 stop13h 17m

Seattle/Tacoma Intl

Fri 4/12

08:30-11:40

1 stop19h 10m

£410

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 5/1

18:00-13:13

2 stops27h 13m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£415

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 5/11

06:30-11:47

1 stop13h 17m

Seattle/Tacoma Intl

Sat 21/11

23:47-07:05

1 stop23h 18m

£415

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 1/12

06:20-13:50

1 stop15h 30m

Seattle/Tacoma Intl

Wed 2/6

07:20-06:45

1 stop15h 25m

£418

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 15/1

06:30-11:49

1 stop13h 19m

Seattle/Tacoma Intl

Fri 22/1

16:55-10:40

Nonstop9h 45m

£419

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 5/11

09:25-11:25

Nonstop10h 00m

Seattle/Tacoma Intl

Sat 21/11

18:45-12:10

Nonstop9h 25m

£425

Flights are sorted by cheapest return flights first.

Deals found on 27/10

Showing 1-10 of 45 resultsSorted by cheapest first
1
2
3
...
5

Best time to book a flight from Heathrow to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Heathrow with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Washington

What is the cheapest month to book a flight from London Heathrow Airport to State of Washington?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £478). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £669). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LHR to WA?

When flying from London Heathrow Airport to State of Washington, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from London Heathrow Airport to State of Washington?

Airfare is below average for this route at the moment.
London Heathrow Airport to State of Washington flights typically cost between £435 and £624 in April.
The cheapest return price found within the last 5 days was £404 on British Airways (12 Apr–21 Apr).

How far ahead should I book a flight from London Heathrow Airport to State of Washington?

The price you pay for your flight from London Heathrow Airport to State of Washington may vary depending on when you book. For the best chance of a lower fare, look to book 56 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing Washington

Get a feel of what it's like to fly with Alaska Airlines,KLM, andVirgin Atlantic from London Heathrow Airport to Washington by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.5

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Crew

8.5

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Crew

8.5

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Crew

8.5

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Crew

8.5

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Crew

8.5

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Related info for your journey

  • How long is the flight from London Heathrow Airport to State of Washington?

    KLM, Delta, and Alaska Airlines can get you from London Heathrow Airport to State of Washington in just under 10h 30m. Your travel time can differ by up to 6h 35m. The distance from London Heathrow Airport to State of Washington is about 4783 mi. This flight may include one or multiple stops.

  • What are the most popular routes from London Heathrow Airport to State of Washington?

  • What are the most reliable airlines from London Heathrow Airport to State of Washington?

    The top 3 most reliable airlines when flying from London Heathrow Airport to State of Washington are Scandinavian Airlines (87%), KLM (84%) and SAUDIA (84%).

  • What are the cheapest flights from London Heathrow Airport to State of Washington?

    Looking for the cheapest flight from London Heathrow Airport to State of Washington? While on average our users pay £1,875, our data indicates the cheapest price to be £346. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £321.

  • Can I find deals for flights from Heathrow to Washington that include hotel bookings?

    Yes. In addition to deals on Heathrow to Washington flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Washington.

  • Can I find deals for business class flights from Heathrow to Washington?

    Yes. Cheapflights offers flight deals from Heathrow to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to State of Washington?

    Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £478). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £669). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Heathrow to Washington

Top 10 airlines flying from Heathrow to Washington

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£328Average£479FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£335Average£522FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£370Average£490FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£392Average£654FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£399Average£639FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£406Average£723FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£410Average£607FlexibilityNo cancel feeOn-time77%
Search Air France flights
Alaska AirlinesCheapest£422Average£556FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
KLMCheapest£428Average£626FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£438Average£638FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

How does Cheapflights help users find flights from Heathrow to Washington?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Washington from Heathrow today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Washington?

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Washington for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Heathrow to Washington with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Heathrow to Washington flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Heathrow to Washington become cheaper?

Not ready to book yet? You can track prices for flights from Heathrow to Washington on Cheapflights with our Price Alert feature and get notified when better prices are available.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.