$168 Find Cheap Flights from Washington to the United Kingdom

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Useful Info

Good to know

Low seasonJanuary
High seasonJuly
Cheapest flight$168
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 19% increase in price.
Flight from Seattle to London Heathrow Airport

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

Insights shared by verified travelers 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 travelers 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 round-trip 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 $537.

  • 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 where round-trip tickets can be as cheap as $822. On the other hand, the most expensive day to fly is Saturday, where round-trip prices are $955 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 at night, when round-trip flights cost $872 on average. Morning departures are around 10% 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 $980.

  • 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 $528 round-trip. The most popular route is Seattle (SEA) to London Heathrow Airport (LHR) and the cheapest round-trip airline ticket found on this route in the last 72 hours was $528.

  • 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 $582 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of round-trip tickets is $997 and $978 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 nonstop flight from Washington to the United Kingdom takes 15h 27m, covering a distance of 4653 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 (92% of total searches to the United Kingdom). The next most popular destinations are Edinburgh (5%) and Manchester (1%). Searches for flights to Inverness (0%), to Belfast (0%) and to Bristol (0%) are also popular.

Book cheap flights from Washington to the United Kingdom

Recent round-trip flight deals

8/11Mon
2 stops
30h 05mSEA-LTN
8/20Wed
2 stops
33h 21mLTN-SEA
$421
8/11Mon
3 stops
21h 20mSEA-STN
8/20Wed
3 stops
32h 16mSTN-SEA
$422
10/17Fri
1 stopScandinavian Airlines
13h 15mSEA-LHR
10/22Wed
1 stopScandinavian Airlines
15h 20mLHR-SEA
$457
10/12Sun
1 stopScandinavian Airlines
21h 20mSEA-LHR
10/21Tue
1 stopScandinavian Airlines
35h 40mLHR-SEA
$463
10/4Sat
1 stopIcelandair
14h 55mSEA-LGW
10/15Wed
1 stopIcelandair
13h 00mLGW-SEA
$484
11/19Wed
1 stopIcelandair
12h 15mSEA-LHR
12/3Wed
1 stopIcelandair
12h 45mLHR-SEA
$487
8/19Tue
nonstopBritish Airways
9h 20mSEA-LHR
9/19Fri
nonstopBritish Airways
9h 45mLHR-SEA
$525
10/1Wed
1 stopAir Canada
15h 15mSEA-LHR
10/15Wed
2 stopsAir Canada
17h 56mLHR-SEA
$528
9/3Wed
2 stopsAir Canada
17h 50mSEA-LHR
10/1Wed
2 stopsAir Canada
18h 51mLHR-SEA
$535
8/25Mon
nonstopBritish Airways
9h 20mSEA-LHR
9/9Tue
nonstopBritish Airways
9h 45mLHR-SEA
$546

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Recent one-way flight deals

10/15Wed
1 stopIcelandair
12h 10mSEA-LHR
$168
10/17Fri
1 stopIcelandair
12h 10mSEA-LHR
$172
7/19Sat
1 stop
16h 08mSEA-LGW
$222
7/22Tue
2 stops
15h 25mSEA-LGW
$242
10/28Tue
1 stopWestJet
14h 30mSEA-LHR
$361
7/26Sat
1 stopJetBlue
22h 50mPDX-LHR
$364
7/23Wed
1 stopJetBlue
13h 52mSEA-LGW
$369
11/5Wed
1 stopAer Lingus
11h 30mSEA-LHR
$372
9/16Tue
3 stopsWestJet
18h 20mSEA-LGW
$412
12/8Mon
1 stopAer Lingus
15h 45mSEA-EDI
$451

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Last minute flights from Washington to the United Kingdom

Last minute flight, train and bus deals

6/22Sun
multi-stopIcelandair
31h 05mSEA-LGW
8/7Thu
multi-stopIcelandair
12h 50mLGW-SEA
$863
6/22Sun
multi-stopIcelandair
31h 05mSEA-LGW
8/6Wed
multi-stopIcelandair
34h 10mLGW-SEA
$865
6/18Wed
multi-stop
20h 35mSEA-EDI
6/20Fri
multi-stop
31h 41mEDI-SEA
$950
6/22Sun
multi-stopScandinavian Airlines
21h 40mSEA-LHR
7/23Wed
multi-stopScandinavian Airlines
15h 10mLHR-SEA
$959
6/22Sun
multi-stopJetBlue
14h 40mSEA-EDI
7/15Tue
multi-stopJetBlue
17h 54mEDI-SEA
$966
6/18Wed
multi-stop
20h 35mSEA-EDI
6/20Fri
multi-stop
31h 41mEDI-SEA
$973
6/20Fri
multi-stopScandinavian Airlines
36h 55mSEA-LHR
8/6Wed
multi-stopScandinavian Airlines
15h 10mLHR-SEA
$1,010
6/22Sun
multi-stopJetBlue
14h 40mSEA-EDI
7/15Tue
multi-stopJetBlue
16h 28mEDI-SEA
$1,013
6/22Sun
multi-stopLufthansa
34h 36mSEA-EDI
7/15Tue
multi-stopLufthansa
37h 16mEDI-SEA
$1,097
6/22Sun
multi-stopLufthansa
28h 05mSEA-EDI
7/15Tue
multi-stopLufthansa
37h 16mEDI-SEA
$1,143

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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 $4,821
Business Class flights to the United Kingdomfrom $2,368
Prem Econ Class flights to the United Kingdomfrom $1,530
Economy Class flights to the United Kingdomfrom $528

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