£122 Find Cheap Flights from Washington to the United Kingdom

1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to the United Kingdom

Travellers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 26% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Free to useThere are no hidden charges or fees.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Useful Info

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

Low seasonJanuary
High seasonSeptember
Cheapest flight£122
Best time to beat the crowds (3% less expensive on average)
Most popular time to fly and prices are also 9% lower on average.
Flight from Seattle 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 
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 £393.

  • 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 £512. On the other hand, the most expensive day to fly is Thursday, when return prices are £732 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 afternoon, when round-trip flights cost £826 on average. Morning departures are around 64% 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 £561 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 £561.

  • 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 £733 and £719 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 5 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 15h 42m, 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 (90% of total searches to the United Kingdom). The next most popular destinations are Edinburgh (5%) and Manchester (1%). Searches for flights to Belfast (1%), to Inverness (0%), and to Bristol (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

3/8Sun
1 stop
14h 25mSEA-STN
19/8Tue
1 stop
17h 35mSTN-SEA
£296
3/8Sun
1 stop
17h 50mSEA-GLA
19/8Tue
1 stop
18h 15mGLA-SEA
£299
8/10Wed
1 stopScandinavian Airlines
18h 10mSEA-LHR
16/10Thu
2 stopsScandinavian Airlines
35h 25mLHR-SEA
£307
3/10Fri
1 stopScandinavian Airlines
33h 00mSEA-LHR
9/10Thu
2 stopsScandinavian Airlines
26h 10mLHR-SEA
£309
3/8Sun
1 stopAer Lingus
12h 20mSEA-LHR
19/8Tue
1 stopAer Lingus
12h 25mLHR-SEA
£346
20/8Wed
1 stopAer Lingus
15h 20mSEA-LHR
27/8Wed
1 stopAer Lingus
16h 00mLHR-SEA
£348
3/8Sun
directVirgin Atlantic
9h 50mSEA-LHR
19/8Tue
1 stopVirgin Atlantic
16h 44mLHR-SEA
£351
3/8Sun
directBritish Airways
9h 20mSEA-LHR
19/8Tue
directBritish Airways
9h 50mLHR-SEA
£353
12/8Tue
1 stopVirgin Atlantic
18h 42mSEA-LGW
26/8Tue
1 stopVirgin Atlantic
19h 15mLGW-SEA
£361
19/8Tue
directBritish Airways
9h 20mSEA-LHR
3/9Wed
directBritish Airways
9h 50mLHR-SEA
£370

Search by stops

Search by airline

Search by price

Recent one-way flight deals

6/10Mon
1 stopIcelandair
12h 10mSEA-LHR
£122
30/9Tue
1 stopIcelandair
17h 20mSEA-LHR
£125
30/9Tue
2 stops
23h 45mSEA-STN
£174
28/10Tue
2 stops
25h 15mSEA-STN
£174
12/10Sun
1 stopWestJet
14h 20mPDX-LHR
£222
12/10Sun
1 stopWestJet
14h 20mPDX-LHR
£226
21/7Mon
1 stopSWISS
16h 50mSEA-LCY
£287
11/11Tue
2 stopsSWISS
17h 28mSEA-LCY
£291
8/9Mon
1 stopBritish Airways
14h 15mSEA-EDI
£316
1/9Mon
1 stopBritish Airways
12h 35mSEA-GLA
£318

Search by stops

Search by airline

Search by price

Last minute flights from Washington to the United Kingdom

Last minute flight, train and bus deals

13/7Sun
direct
9h 50mSEA-LHR
30/9Tue
multi-stop
17h 35mLHR-SEA
£423
13/7Sun
multi-stopDelta
23h 10mSEA-LHR
30/9Tue
multi-stopDelta
14h 10mLHR-SEA
£426
13/7Sun
directAir France
9h 50mSEA-LHR
30/9Tue
directAir France
10h 25mLHR-SEA
£428
13/7Sun
multi-stopAir Canada
39h 10mSEA-LHR
20/7Sun
multi-stopAir Canada
26h 50mLHR-SEA
£473
13/7Sun
multi-stop
30h 45mSEA-LHR
20/7Sun
multi-stop
26h 50mLHR-SEA
£483
13/7Sun
directVirgin Atlantic
9h 45mSEA-LHR
20/7Sun
multi-stopVirgin Atlantic
25h 40mLHR-SEA
£486
13/7Sun
multi-stopAir Canada
16h 00mSEA-LHR
30/9Tue
multi-stopAir Canada
12h 26mLHR-SEA
£525
12/7Sat
multi-stopSWISS
12h 51mSEA-LHR
26/7Sat
multi-stopSWISS
16h 50mLHR-SEA
£575
9/7Wed
multi-stopVirgin Atlantic
19h 00mPDX-LGW
23/7Wed
multi-stopVirgin Atlantic
19h 35mLGW-PDX
£753
12/7Sat
multi-stopSWISS
17h 30mSEA-LGW
20/7Sun
multi-stopSWISS
31h 56mLGW-SEA
£843

Search by stops

Search by airline

Search by price

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.

Not what you’re looking for? Find thousands of other hotels, flights, car hires and package deals with KAYAK.