Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Washington from £388

LHR — SEA
7 Dec — 14 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

Sat 5/1209:25 -
Nonstop10h 00m
Mon 7/1214:07 -
1 stop14h 03m
Deal found 3/11£407
Thu 3/1217:05 -
1 stop26h 45m
Thu 24/1216:50 -
Nonstop9h 50m
Deal found 3/11£408
Thu 10/1214:55 -
Nonstop9h 55m
Thu 24/1218:45 -
Nonstop9h 25m
Deal found 2/11£409
Mon 14/1212:20 -
Nonstop10h 30m
Thu 7/107:20 -
1 stop15h 30m
Deal found 2/11£410
Mon 7/1212:20 -
Nonstop10h 30m
Mon 14/1208:25 -
1 stop14h 40m
Deal found 3/11£410
Wed 2/1209:00 -
2 stops19h 59m
Wed 9/1215:15 -
1 stop12h 35m
Deal found 2/11£411
Sat 26/1212:20 -
Nonstop10h 30m
Fri 8/108:25 -
1 stop14h 40m
Deal found 3/11£413
Mon 23/1108:55 -
1 stop14h 19m
Sun 6/1216:50 -
Nonstop9h 50m
Deal found 4/11£413
Sun 13/1211:20 -
1 stop15h 23m
Thu 7/107:20 -
1 stop15h 30m
Deal found 2/11£414
Sat 5/1206:30 -
1 stop13h 30m
Sun 6/1214:50 -
1 stop14h 10m
Deal found 3/11£415
Fri 20/1106:30 -
1 stop13h 17m
Thu 3/1216:50 -
Nonstop9h 50m
Deal found 4/11£416
Sat 21/1114:45 -
1 stop17h 05m
Wed 25/1119:24 -
1 stop32h 56m
Deal found 6/11£599

Find flight deals from Heathrow to Washington

Round-trip from

£407

One-way from

£388

Popular in

August

Cheapest in

February

Average price

£493

Good round-trip deal

£425 or less

Good one-way deal

£393 or less
British Airways
  • British Airways
  • 5/12-7/12
  • 1 total stop
  • 24h 03m total
  • London to Washington
Search Deals
Icelandair
  • Icelandair
  • 1/12-31/12
  • 1 total stop
  • 28h 25m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£38 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Washington.
Search Deals
Price to beat on a one-way flight from London Heathrow to Washington.
Search Deals

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

Fri 22/1

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£395
Fastest return journey

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 11/1

14:45-16:50

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£397

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Wed 3/3

15:15-08:47

3 stops49h 32m

Spokane

Wed 31/12

00:00-09:00

Nonstop0h 00m

£402

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 7/4

17:00-19:10

Nonstop10h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£402

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 3/3

07:30-21:17

2 stops21h 47m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£404

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 22/2

17:30-20:55

3 stops35h 25m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£407

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 16/1

06:20-22:21

2 stops24h 01m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£407

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 7/4

17:45-20:03

Nonstop10h 18m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£417

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Thu 3/12

14:50-18:42

3 stops35h 52m

Spokane

Wed 31/12

00:00-09:00

Nonstop0h 00m

£424

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 10/12

09:25-11:25

Nonstop10h 00m

Seattle/Tacoma Intl

Mon 14/12

09:15-07:50

1 stop14h 35m

£428

Flights are sorted by cheapest return flights first.

Deals found on 6/11

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 £671). 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.

Weekly flight availability from London Heathrow Airport to State of Washington

The most flights from LHR to USWA are scheduled on a Friday (13 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (9 on average).

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 £430 and £621 in December.
The cheapest return price found within the last 5 days was £407 on British Airways (5 Dec–7 Dec).

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.
Alaska Airlines
7.9
Good
13,152 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

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.
Alaska Airlines
7.9
Good
13,152 reviews
Alaska Airlines
7.9
Good
13,152 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

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.
KLM
7.8
Good
1,594 reviews
Alaska Airlines
7.9
Good
13,152 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

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.
Virgin Atlantic
7.5
Good
698 reviews
Alaska Airlines
7.9
Good
13,152 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

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.
Icelandair
6.9
Okay
767 reviews
Alaska Airlines
7.9
Good
13,152 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

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.
British Airways
6.7
Okay
8,285 reviews
Alaska Airlines
7.9
Good
13,152 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

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?

    British Airways, KLM, and Alaska Airlines can get you from London Heathrow Airport to State of Washington in just under 10h. Your travel time can differ by up to 21h 19m. 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 cheapest airlines to fly from London Heathrow Airport to State of Washington one-way?

    One-way options have recently been found by users for as low as £337 on British Airways. Other airlines that offer cheap prices include Icelandair from £341 and Virgin Atlantic from £364 one-way.

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

    When deciding which route to take from London Heathrow Airport to State of Washington consider London Heathrow - Seattle/Tacoma Intl, London Heathrow - Portland or London Heathrow - Spokane as they are the most popular.

  • 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 (85%), 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 £1,877, our data indicates the cheapest price to be £349. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £258.

  • 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 £671). 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

Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Heathrow to LaGuardia flights
Gatwick to John F Kennedy Intl flights
Gatwick to Newark flights
Stansted to John F Kennedy Intl flights
Heathrow to Miami flights
Luton to John F Kennedy Intl flights
London City to John F Kennedy Intl flights
Luton to Newark flights
Stansted to Newark flights
Heathrow to Los Angeles flights
Gatwick to LaGuardia flights
London City to Newark flights
Heathrow to Orlando flights
Heathrow to Boston flights
Heathrow to Dallas/Fort Worth flights
Heathrow to San Francisco flights
Heathrow to Las Vegas flights
Gatwick to Miami flights
Heathrow to Dulles Intl flights
Stansted to Miami flights
London City to Miami flights
Gatwick to Orlando flights
Heathrow to Seattle flights
Heathrow to Baltimore flights
Heathrow to O'Hare Intl flights
Luton to Miami flights
Heathrow to Hobby flights
Gatwick to Los Angeles flights
Heathrow to Atlanta flights
London City to Los Angeles flights
Stansted to Los Angeles flights
Heathrow to Ontario flights
Heathrow to George Bush Intcntl flights
Heathrow to Tampa flights
London City to Boston flights
Gatwick to Boston flights
Stansted to Orlando flights
London City to Orlando flights
Luton to Los Angeles flights
Stansted to Boston flights
Gatwick to San Francisco flights
London City to San Francisco flights
Heathrow to Denver flights
Gatwick to Dulles Intl flights
Gatwick to Fort Lauderdale flights
Stansted to San Francisco flights
Heathrow to Fort Lauderdale flights
Stansted to Dulles Intl flights

Top 10 airlines flying from Heathrow to Washington

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£329Average£480FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£336Average£530FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£372Average£492FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£393Average£649FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£395Average£661FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£408Average£725FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£411Average£606FlexibilityNo cancel feeOn-time77%
Search Air France flights
Alaska AirlinesCheapest£423Average£726FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
KLMCheapest£429Average£625FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£438Average£639FlexibilityNo 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.