£146 Find Cheap Flights from Washington to the United Kingdom

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Good to know - Cheap tickets from Washington to the United Kingdom

Low seasonJanuary
High seasonSeptember
Cheapest flight£146
Best time to beat the crowds (3% less expensive on average)
Most popular time to fly and prices are also 10% lower on average.
Flight from Portland to London Heathrow Airport

Flights from Washington to the United Kingdom: the best tips from KAYAK users

Insights shared by verified travellers who flew the route from Washington to the United Kingdom 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with British AirwaysSEA-LHRApr 2025
Make sure you have plenty of time between flights if you are delayed.
Verified travelerFlew with British AirwaysSEA-LHRApr 2024
Bring a sack lunch -- airport food was very expensive.

FAQs for booking flights from Washington to the United Kingdom

  • How does KAYAK find such low prices on flights from Washington to the United Kingdom?

    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 the United Kingdom.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to the United Kingdom?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Washington to the United Kingdom is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington to the United Kingdom?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from Washington to the United Kingdom with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to the United Kingdom?

    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 from Washington to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which is the cheapest airport to fly into in the United Kingdom?

    Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in the United Kingdom is London Heathrow Airport (LHR), with an average flight price of £367.

  • What is the cheapest day to fly to the United Kingdom?

    Based on KAYAK data, the cheapest day to fly to the United Kingdom is Tuesday when return tickets can be as cheap as £566. On the other hand, the most expensive day to fly is Thursday, when return prices are £778 on average.

  • What is the cheapest time of day to fly to the United Kingdom?

    The cheapest time of day to fly to the United Kingdom is generally in the evening, when round-trip flights cost £857 on average. Morning departures are around 60% more expensive than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally in the morning, which is peak travel time and where the average cost of a ticket is £1,369.

  • What is the cheapest flight to the United Kingdom?

    The cheapest ticket to the United Kingdom from Washington found in the last 72 hours was to London Heathrow Airport, at £618 return. The most popular route is Seattle (SEA) to London Heathrow Airport (LHR) and the cheapest return airline ticket found on this route in the last 72 hours was £618.

  • What is the cheapest month to fly from Washington to the United Kingdom?

    The cheapest month for flights from Washington to the United Kingdom is November, when tickets cost £428 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of round-trip tickets is £734 and £718 respectively.

  • How far in advance should I book a flight from Washington to the United Kingdom?

    To get a below-average price on the flight from Washington to the United Kingdom, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

  • How long is the flight to the United Kingdom?

    An average direct flight from Washington to the United Kingdom takes 14h 58m, covering a distance of 4655 miles. The shortest route is Seattle (SEA) to London Heathrow Airport (LHR) with an average flight time of 9h 20m.

  • What are the most popular destinations in the United Kingdom?

    Based on KAYAK flight searches, the most popular destination is London (93% of total searches to the United Kingdom). The next most popular destinations are Edinburgh (4%) and Manchester (1%). Searches for flights to Inverness (0%), to Belfast (0%), and to Birmingham (0%) are also popular.

Book cheap flights from Washington to the United Kingdom

Cheapest flights to the United Kingdom from Washington found in 2025

Recent return flight deals

1/10Wed
1 stopScandinavian Airlines
15h 40mSEA-LHR
14/10Tue
2 stopsScandinavian Airlines
26h 10mLHR-SEA
£320
15/10Wed
1 stopScandinavian Airlines
17h 20mSEA-LHR
20/10Mon
2 stopsScandinavian Airlines
50h 10mLHR-SEA
£322
6/10Mon
1 stopUnited Airlines
33h 40mPDX-LHR
9/10Thu
2 stopsUnited Airlines
20h 16mLHR-PDX
£375
17/11Mon
1 stop
12h 25mPDX-LHR
19/11Wed
2 stops
21h 38mLHR-PDX
£381
1/10Wed
directBritish Airways
9h 20mSEA-LHR
14/10Tue
directBritish Airways
9h 45mLHR-SEA
£386
8/10Wed
1 stopIcelandair
15h 20mPDX-LGW
29/10Wed
1 stopIcelandair
13h 05mLGW-PDX
£403
1/10Wed
1 stopIcelandair
15h 20mPDX-LGW
6/10Mon
1 stopIcelandair
34h 15mLGW-PDX
£404
15/8Fri
1 stop
16h 25mPDX-LGW
1/9Mon
1 stop
31h 00mLGW-PDX
£408
27/8Wed
1 stopBritish Airways
14h 41mSEA-LHR
12/9Fri
directBritish Airways
9h 45mLHR-SEA
£415
17/9Wed
1 stopUnited Airlines
15h 15mSEA-LHR
8/10Wed
1 stopUnited Airlines
15h 59mLHR-SEA
£460

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Recent one-way flight deals

1/10Wed
1 stopIcelandair
12h 35mPDX-LHR
£146
6/10Mon
1 stopIcelandair
21h 00mPDX-LHR
£151
30/7Wed
2 stops
35h 45mPDX-LGW
£177
30/7Wed
1 stop
31h 43mSEA-LGW
£183
30/11Sun
2 stopsWestJet
17h 20mSEA-LHR
£238
1/12Mon
2 stopsWestJet
17h 20mSEA-LHR
£239
8/11Sat
1 stopJetBlue
23h 26mSEA-LHR
£251
1/9Mon
1 stopJetBlue
13h 14mPDX-LGW
£269
2/8Sat
2 stopsAir Canada
32h 10mPDX-LHR
£281
27/7Sun
2 stopsAir Canada
17h 00mSEA-LHR
£285

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Last minute flights from Washington to the United Kingdom

Last minute flight, train and bus deals

17/6Tue
multi-stop
31h 35mSEA-STN
24/6Tue
multi-stop
42h 01mSTN-SEA
£650
17/6Tue
multi-stop
30h 50mSEA-LTN
24/6Tue
multi-stop
32h 26mLTN-SEA
£650
15/6Sun
multi-stopIcelandair
11h 40mSEA-LGW
24/9Wed
multi-stopIcelandair
13h 00mLGW-SEA
£686
15/6Sun
multi-stopIcelandair
12h 50mSEA-LHR
24/9Wed
multi-stopIcelandair
12h 45mLHR-SEA
£689
14/6Sat
multi-stopJetBlue
14h 05mSEA-LGW
28/6Sat
multi-stopJetBlue
17h 43mLGW-SEA
£739
17/6Tue
multi-stopAir Canada
22h 20mSEA-LHR
24/6Tue
multi-stopAir Canada
31h 06mLHR-SEA
£748
15/6Sun
multi-stopAir Canada
18h 15mSEA-LHR
24/6Tue
multi-stopAir Canada
19h 11mLHR-SEA
£768
15/6Sun
multi-stopJetBlue
14h 05mSEA-LGW
9/7Wed
multi-stopJetBlue
17h 54mLGW-SEA
£798
13/6Fri
multi-stopScandinavian Airlines
33h 20mSEA-LHR
13/7Sun
multi-stopScandinavian Airlines
30h 15mLHR-SEA
£823
13/6Fri
multi-stopScandinavian Airlines
33h 35mSEA-LHR
13/7Sun
multi-stopScandinavian Airlines
30h 15mLHR-SEA
£826

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Everything you need to know for your flight to the United Kingdom

Cabin class types available on flights to Washington

Cabin classes available on flights to Washington. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
First Class flights to the United Kingdomfrom £4,655
Business Class flights to the United Kingdomfrom £2,197
Prem Econ Class flights to the United Kingdomfrom £1,701
Economy class flights to the United Kingdomfrom £455

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