$245 Find Cheap Flights from Washington to the United Kingdom

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Useful Info
Useful Info

Good to know

Low seasonFebruary
High seasonAugust
Cheapest flight$245
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from Portland to London Gatwick 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.
GaryFlew with British AirwaysSEA-LHRAug 2024
I have always used British Airways for trips to London and have been happy with their service.
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 $592.

  • 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 $833. On the other hand, the most expensive day to fly is Saturday, where round-trip prices are $979 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 $895 on average. Morning departures are around 9% 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 $609 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 $609.

  • 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 $999 and $922 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 30m, covering a distance of 4649 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 (4%) and Manchester (2%). Searches for flights to Inverness (1%), to Belfast (1%) and to Aberdeen (0%) are also popular.

Book cheap flights from Washington to the United Kingdom

Recent round-trip flight deals

8/25Mon
1 stopScandinavian Airlines
21h 40mSEA-LHR
9/8Mon
1 stopScandinavian Airlines
15h 10mLHR-SEA
$437
8/25Mon
1 stopScandinavian Airlines
21h 40mSEA-LHR
9/8Mon
1 stopScandinavian Airlines
15h 10mLHR-SEA
$467
9/21Sun
1 stopIcelandair
15h 20mPDX-LGW
10/4Sat
1 stopIcelandair
34h 15mLGW-PDX
$539
10/20Mon
1 stopIcelandair
12h 35mPDX-LHR
10/30Thu
1 stopIcelandair
28h 20mLHR-PDX
$540
8/17Sun
1 stopAer Lingus
15h 50mSEA-LHR
8/29Fri
1 stopAer Lingus
17h 00mLHR-SEA
$588
7/27Sun
1 stopDelta
14h 26mSEA-LGW
8/28Thu
1 stopDelta
18h 53mLGW-SEA
$596
10/22Wed
nonstopIberia
9h 35mPDX-LHR
10/31Fri
nonstopIberia
10h 15mLHR-PDX
$598
8/19Tue
nonstopIberia
9h 20mSEA-LHR
9/3Wed
nonstopIberia
9h 50mLHR-SEA
$598
8/17Sun
nonstopDelta
9h 45mSEA-LHR
8/29Fri
1 stopDelta
13h 00mLHR-SEA
$615
6/10Tue
1 stopAer Lingus
15h 30mSEA-EDI
6/17Tue
1 stopAer Lingus
12h 30mEDI-SEA
$862

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Recent one-way flight deals

7/19Sat
1 stop
37h 36mPDX-LGW
$245
7/27Sun
1 stopIcelandair
11h 40mSEA-LGW
$248
6/11Wed
1 stopWestJet
19h 00mSEA-EDI
$336
6/1Sun
3 stopsWestJet
39h 55mSEA-EDI
$364
9/24Wed
1 stopJetBlue
14h 05mSEA-LGW
$364
8/6Wed
nonstopBritish Airways
9h 20mSEA-LHR
$377
7/28Mon
nonstopDelta
9h 50mSEA-LHR
$378
7/13Sun
2 stopsDelta
24h 15mSEA-EDI
$384
5/24Sat
1 stopJetBlue
14h 32mSEA-EDI
$404
8/4Mon
nonstopBritish Airways
9h 20mSEA-LHR
$415

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Last minute flights from Washington to the United Kingdom

Last minute flight, train and bus deals

5/4Sun
multi-stopIcelandair
32h 45mSEA-LGW
5/20Tue
multi-stopIcelandair
13h 00mLGW-SEA
$579
5/4Sun
multi-stopIcelandair
32h 55mSEA-LHR
5/20Tue
multi-stopIcelandair
31h 15mLHR-SEA
$634
5/5Mon
multi-stop
17h 50mSEA-STN
5/20Tue
multi-stop
33h 00mSTN-SEA
$717
5/5Mon
multi-stop
11h 35mSEA-LGW
5/15Thu
multi-stop
35h 10mLGW-SEA
$717
5/4Sun
multi-stopIberia
14h 53mPDX-LHR
5/21Wed
nonstopIberia
9h 55mLHR-PDX
$738
5/4Sun
multi-stopDelta
15h 25mPDX-LHR
5/21Wed
multi-stopDelta
17h 39mLHR-PDX
$739
5/4Sun
multi-stopDelta
18h 08mPDX-LHR
5/21Wed
multi-stopDelta
13h 55mLHR-PDX
$748
5/4Sun
multi-stopJetBlue
15h 22mSEA-LHR
5/20Tue
multi-stopJetBlue
34h 03mLHR-SEA
$767
5/4Sun
multi-stopJetBlue
15h 22mSEA-LHR
5/8Thu
multi-stopJetBlue
20h 39mLHR-SEA
$774
5/1Thu
multi-stopIberia
17h 25mPDX-LHR
5/15Thu
nonstopIberia
9h 55mLHR-PDX
$788

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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 $4,218
Business Class flights to the United Kingdomfrom $1,907
Prem Econ Class flights to the United Kingdomfrom $1,647
Economy Class flights to the United Kingdomfrom $609

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