$165 Find Cheap Flights from Washington to the United Kingdom

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Useful Info

Good to know

Low seasonFebruary
High seasonJuly
Cheapest flight$165
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 18% 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 $479.

  • 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 $815. On the other hand, the most expensive day to fly is Saturday, where round-trip prices are $944 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 $857 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 $521 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 $521.

  • 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 $580 (return) on average. On the other hand, the most expensive months are December and June, when the average cost of round-trip tickets is $1,099 and $964 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 8 weeks before departure.

  • How long is the flight to the United Kingdom?

    An average nonstop flight from Washington to the United Kingdom takes 16h 11m, 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 (91% of total searches to the United Kingdom). The next most popular destinations are Edinburgh (5%) and Manchester (2%). Searches for flights to Inverness (1%), to Belfast (0%) and to Southampton (0%) are also popular.

Book cheap flights from Washington to the United Kingdom

Recent round-trip flight deals

8/11Mon
2 stops
24h 45mSEA-STN
8/20Wed
2 stops
30h 45mSTN-SEA
$413
8/11Mon
3 stops
19h 30mSEA-STN
8/20Wed
2 stops
30h 45mSTN-SEA
$420
10/12Sun
1 stopScandinavian Airlines
21h 20mSEA-LHR
10/17Fri
1 stopScandinavian Airlines
15h 20mLHR-SEA
$427
10/5Sun
1 stopScandinavian Airlines
17h 20mSEA-LHR
10/18Sat
2 stopsScandinavian Airlines
30h 25mLHR-SEA
$431
7/30Wed
1 stopAer Lingus
15h 20mSEA-LHR
9/11Thu
1 stopAer Lingus
12h 25mLHR-SEA
$471
12/1Mon
1 stopIcelandair
20h 55mSEA-LHR
2/28Sat
1 stopIcelandair
28h 25mLHR-SEA
$472
10/1Wed
1 stopAer Lingus
15h 20mSEA-LHR
10/15Wed
1 stopAer Lingus
17h 00mLHR-SEA
$474
10/5Sun
1 stopIcelandair
14h 55mSEA-LGW
10/21Tue
1 stopIcelandair
34h 10mLGW-SEA
$475
8/26Tue
2 stopsAir Canada
27h 15mSEA-LHR
9/2Tue
1 stopAir Canada
18h 01mLHR-SEA
$479
8/26Tue
2 stopsAir Canada
27h 15mSEA-LHR
9/2Tue
1 stopAir Canada
18h 01mLHR-SEA
$485

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Recent one-way flight deals

10/11Sat
1 stopIcelandair
12h 10mSEA-LHR
$165
10/1Wed
1 stopIcelandair
12h 35mPDX-LHR
$166
10/14Tue
2 stops
20h 30mSEA-STN
$237
10/14Tue
2 stops
20h 30mSEA-STN
$238
11/12Wed
1 stopWestJet
13h 30mSEA-LHR
$288
10/5Sun
1 stopWestJet
14h 20mPDX-LHR
$290
8/11Mon
1 stopJetBlue
22h 50mPDX-LHR
$351
8/13Wed
1 stopJetBlue
22h 50mPDX-LHR
$378
10/9Thu
nonstopBritish Airways
9h 35mPDX-LHR
$389
9/9Tue
2 stopsBritish Airways
17h 38mSEA-GLA
$444

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Last minute flights from Washington to the United Kingdom

Last minute flight, train and bus deals

7/18Fri
multi-stopAer Lingus
15h 50mSEA-LHR
8/28Thu
multi-stopAer Lingus
17h 00mLHR-SEA
$677
7/18Fri
multi-stopBritish Airways
13h 02mSEA-LHR
7/28Mon
multi-stopBritish Airways
33h 08mLHR-SEA
$698
7/18Fri
nonstopDelta
9h 45mSEA-LHR
7/28Mon
multi-stopDelta
17h 20mLHR-SEA
$728
7/18Fri
multi-stopDelta
12h 20mSEA-LHR
7/28Mon
multi-stopDelta
17h 20mLHR-SEA
$733
7/19Sat
multi-stopUnited Airlines
19h 20mSEA-LHR
7/26Sat
multi-stopUnited Airlines
22h 12mLHR-SEA
$745
7/18Fri
multi-stopJetBlue
13h 52mSEA-LGW
8/28Thu
multi-stopJetBlue
17h 55mLGW-SEA
$760
7/19Sat
multi-stop
27h 15mSEA-LHR
7/26Sat
multi-stop
29h 49mLHR-SEA
$814
7/18Fri
multi-stop
54h 54mSEA-LGW
8/28Thu
multi-stop
20h 05mLGW-SEA
$826
7/16Wed
multi-stopJetBlue
13h 52mSEA-LGW
7/30Wed
multi-stopJetBlue
17h 54mLGW-SEA
$840
7/15Tue
multi-stopUnited Airlines
18h 35mSEA-LHR
8/1Fri
multi-stopUnited Airlines
15h 59mLHR-SEA
$998

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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 $2,341
Business Class flights to the United Kingdomfrom $3,166
Prem Econ Class flights to the United Kingdomfrom $1,639
Economy Class flights to the United Kingdomfrom $539

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