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Seattle-Tacoma International Airport to Heathrow Airport flight

Explore the cheapest one-way and round-trip flights from Seattle-Tacoma International Airport to Heathrow Airport over the next 90 days, with one-way fares from DKK 1,738 and round-trip from DKK 3,516. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        SEA 14:30
        9h 30m
        Direct
        LHR 07:00
        Seattle - London | Thu, Nov 12 | British Airways
        LHR 14:55
        9h 55m
        Direct
        SEA 16:50
        London - Seattle | Thu, Nov 19 | British Airways
        DKK 4,839 DKK 6,285
        23% off
        23% off
        DKK 6,285 DKK 4,839
      • SEA 18:45
        9h 25m
        Direct
        LHR 12:10
        Seattle - London | Thu, Nov 19 | British Airways
        LHR 09:25
        10h
        Direct
        SEA 11:25
        London - Seattle | Thu, Nov 26 | British Airways
        DKK 4,839 DKK 6,285
        23% off
        23% off
        DKK 6,285 DKK 4,839
      • SEA 15:55
        18h 35m
        1 stop
        LHR 18:30
        Seattle - London | Mon, Oct 19 | Scandinavian Airlines
        LHR 06:40
        15h 5m
        1 stop
        SEA 13:45
        London - Seattle | Mon, Oct 26 | Scandinavian Airlines
        DKK 3,516 DKK 6,285
        44% off
        44% off
        DKK 6,285 DKK 3,516
      • SEA 15:55
        16h 5m
        1 stop
        LHR 16:00
        Seattle - London | Mon, Oct 12 | Scandinavian Airlines
        LHR 19:30
        26h 15m
        1 stop
        SEA 13:45
        London - Seattle | Sat, Oct 17 | Scandinavian Airlines
        DKK 3,516
        44% off
        DKK 6,285 DKK 3,516
      • SEA 15:55
        16h 5m
        1 stop
        LHR 16:00
        Seattle - London | Thu, Oct 8 | Scandinavian Airlines
        LHR 06:40
        15h 5m
        1 stop
        SEA 13:45
        London - Seattle | Sun, Oct 11 | Scandinavian Airlines
        DKK 3,516
        44% off
        DKK 6,285 DKK 3,516
      • SEA 15:55
        17h 45m
        1 stop
        LHR 17:40
        Seattle - London | Thu, Oct 22 | Scandinavian Airlines
        LHR 06:40
        15h 5m
        1 stop
        SEA 13:45
        London - Seattle | Mon, Oct 26 | Scandinavian Airlines
        DKK 3,570
        43% off
        DKK 6,285 DKK 3,570
      • SEA 15:55
        16h 5m
        1 stop
        LHR 16:00
        Seattle - London | Tue, Oct 20 | Scandinavian Airlines
        LHR 06:40
        15h 5m
        1 stop
        SEA 13:45
        London - Seattle | Mon, Oct 26 | Scandinavian Airlines
        DKK 3,570
        43% off
        DKK 6,285 DKK 3,570
      • SEA 15:55
        13h 40m
        1 stop
        LHR 13:35
        Seattle - London | Sun, Oct 18 | Scandinavian Airlines
        LHR 19:30
        26h 15m
        1 stop
        SEA 13:45
        London - Seattle | Sat, Oct 24 | Scandinavian Airlines
        DKK 3,570
        43% off
        DKK 6,285 DKK 3,570
      • SEA 15:55
        21h 45m
        1 stop
        LHR 21:40
        Seattle - London | Tue, Oct 13 | Scandinavian Airlines
        LHR 18:40
        27h 5m
        1 stop
        SEA 13:45
        London - Seattle | Sat, Oct 17 | Scandinavian Airlines
        DKK 3,570
        43% off
        DKK 6,285 DKK 3,570
      • SEA 15:55
        13h 40m
        1 stop
        LHR 13:35
        Seattle - London | Sun, Oct 11 | Scandinavian Airlines
        LHR 19:30
        26h 15m
        1 stop
        SEA 13:45
        London - Seattle | Sat, Oct 17 | Scandinavian Airlines
        DKK 3,570
        43% off
        DKK 6,285 DKK 3,570
      • SEA 15:55
        21h 45m
        1 stop
        LHR 21:40
        Seattle - London | Tue, Oct 6 | Scandinavian Airlines
        LHR 19:30
        26h 15m
        1 stop
        SEA 13:45
        London - Seattle | Sat, Oct 10 | Scandinavian Airlines
        DKK 3,570
        43% off
        DKK 6,285 DKK 3,570
      • SEA 15:55
        16h 5m
        1 stop
        LHR 16:00
        Seattle - London | Thu, Oct 15 | Scandinavian Airlines
        LHR 06:40
        15h 5m
        1 stop
        SEA 13:45
        London - Seattle | Mon, Oct 19 | Scandinavian Airlines
        DKK 3,570
        43% off
        DKK 6,285 DKK 3,570
      • SEA 19:10
        12h 50m
        1 stop
        LHR 16:00
        Seattle - London | Thu, Oct 8 | Aer Lingus
        LHR 08:50
        16h 20m
        1 stop
        SEA 17:10
        London - Seattle | Sun, Oct 11 | Aer Lingus
        DKK 4,685
        25% off
        DKK 6,285 DKK 4,685
      • SEA 19:10
        14h 10m
        1 stop
        LHR 17:20
        Seattle - London | Thu, Oct 22 | Aer Lingus
        LHR 08:50
        16h 20m
        1 stop
        SEA 17:10
        London - Seattle | Sun, Oct 25 | Aer Lingus
        DKK 4,756
        24% off
        DKK 6,285 DKK 4,756
      • SEA 13:00
        17h 25m
        1 stop
        LON 14:00
        Seattle - London | Sun, Sep 27 | Normal Airline
        LON 15:00
        6h
        Direct
        SEA 16:00
        London - Seattle | Tue, Sep 29 | Normal Airline
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      • Cheapest nonstop
        SEA 17:40
        9h 50m
        Direct
        LHR 10:30
        Seattle - London | Wed, Nov 11 | Virgin Atlantic
        DKK 2,115 DKK 2,799
        24% off
        24% off
        DKK 2,799 DKK 2,115
      • SEA 19:55
        9h 25m
        Direct
        LHR 12:20
        Seattle - London | Wed, Nov 11 | Alaska Airlines
        DKK 2,155 DKK 2,799
        23% off
        23% off
        DKK 2,799 DKK 2,155
      • SEA 15:40
        12h 10m
        1 stop
        LHR 10:50
        Seattle - London | Thu, Nov 5 | Icelandair
        DKK 1,738 DKK 2,799
        38% off
        38% off
        DKK 2,799 DKK 1,738
      • SEA 15:35
        12h 15m
        1 stop
        LHR 10:50
        Seattle - London | Sat, Nov 7 | Icelandair
        DKK 1,763
        37% off
        DKK 2,799 DKK 1,763
      • SEA 15:40
        20h 40m
        1 stop
        LHR 20:20
        Seattle - London | Wed, Oct 21 | Icelandair
        DKK 1,807
        35% off
        DKK 2,799 DKK 1,807
      • SEA 14:30
        14h 20m
        1 stop
        LHR 12:50
        Seattle - London | Fri, Nov 20 | WestJet
        DKK 1,903
        32% off
        DKK 2,799 DKK 1,903
      • SEA 14:35
        12h 15m
        1 stop
        LHR 10:50
        Seattle - London | Tue, Nov 17 | Icelandair
        DKK 1,915
        32% off
        DKK 2,799 DKK 1,915
      • SEA 14:35
        20h 55m
        1 stop
        LHR 19:30
        Seattle - London | Thu, Nov 19 | Icelandair
        DKK 1,916
        32% off
        DKK 2,799 DKK 1,916
      • SEA 15:40
        12h 15m
        1 stop
        LHR 11:55
        Seattle - London | Thu, Oct 15 | Icelandair
        DKK 1,957
        30% off
        DKK 2,799 DKK 1,957
      • SEA 19:00
        32h 55m
        1 stop
        LHR 11:55
        Seattle - London | Fri, Oct 16 | Icelandair
        DKK 1,972
        30% off
        DKK 2,799 DKK 1,972
      • SEA 19:05
        32h 45m
        1 stop
        LHR 11:50
        Seattle - London | Thu, Nov 19 | Air Canada
        DKK 1,976
        28% off
        DKK 2,799 DKK 1,976
      • SEA 19:05
        32h 45m
        1 stop
        LHR 11:50
        Seattle - London | Thu, Nov 19 | United Airlines
        DKK 1,982
        28% off
        DKK 2,799 DKK 1,982
      • SEA 19:00
        17h 20m
        1 stop
        LHR 20:20
        Seattle - London | Sun, Oct 25 | Icelandair
        DKK 1,988
        28% off
        DKK 2,799 DKK 1,988
      • SEA 08:05
        20h
        1 stop
        LHR 11:05
        Seattle - London | Thu, Nov 5 | Alaska Airlines
        DKK 1,996
        28% off
        DKK 2,799 DKK 1,996
      • SEA 13:00
        17h 25m
        1 stop
        LON 14:00
        Seattle - London | Sun, Sep 27 | Normal Airline
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Displayed flight fares from Seattle-Tacoma International Airport to Heathrow Airport are based on average prices across airlines for the next 3 months according to the latest Trip.com data.

Trip.com Price Insights: Flights from Seattle-Tacoma International Airport to Heathrow Airport

What is the cheapest month to fly from Seattle-Tacoma International Airport to Heathrow Airport?

The data is based on the past 12 months and shows the average one-way ticket prices from Seattle-Tacoma International Airport to Heathrow Airport for each month in the Trip.com database.

Based on Trip.com's data from the past 12 months, the cheapest one-way flights from Seattle-Tacoma International Airport to Heathrow Airport are usually in August, with an average price of DKK 3,257. It is best to avoid June, when the average price can reach DKK 5,068.

DKK 5,068
DKK 4,163
DKK 3,257
DKK 2,352
    Cheapest
  • DKK 3,923
    Sep
  • DKK 3,402
    Oct
  • DKK 3,986
    Nov
  • DKK 3,960
    Dec
  • DKK 3,620
    Jan
  • DKK 3,334
    Feb
  • DKK 4,299
    Mar
  • DKK 4,666
    Apr
  • DKK 4,249
    May
  • DKK 5,068
    Jun
  • DKK 3,534
    Jul
  • DKK 3,257
    Aug

What is the cheapest day of the week to fly from Seattle-Tacoma International Airport to Heathrow Airport?

The data is based on the past 12 months and shows the average ticket prices from Seattle-Tacoma International Airport to Heathrow Airport for each day of the week in the Trip.com database.

Based on Trip.com's data from the past 12 months, the cheapest departure day from Seattle-Tacoma International Airport to Heathrow Airport is Monday, with average prices usually lower than other days. Avoid departing on Friday as prices are typically highest on that day.

DKK 4,088
DKK 3,482
DKK 2,876
DKK 2,270
  • DKK 2,876
    Mon
  • DKK 3,777
    Tue
  • DKK 3,874
    Wed
  • DKK 4,023
    Thu
  • DKK 4,088
    Fri
  • DKK 4,079
    Sat
  • DKK 3,843
    Sun

Which airline offers the cheapest flights from Seattle-Tacoma International Airport to Heathrow Airport?

The cheapest airline flying from Seattle-Tacoma International Airport to Heathrow Airport is Icelandair (from DKK 1,738) among 10 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Icelandair
From DKK 1,738
WestJet
From DKK 1,903
Air Canada
From DKK 1,909
United Airlines
From DKK 1,982
Alaska Airlines
From DKK 1,996
Virgin Atlantic
From DKK 2,045
Jetblue Airways
From DKK 2,067
Lufthansa
From DKK 2,108
Delta Air Lines
From DKK 2,112
American Airlines
From DKK 2,171

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What is the flight schedule from Seattle-Tacoma International Airport to Heathrow Airport?

Check the schedule for flights from Seattle to London and find the flight that best matches your travel plans.

Flight info.
Departure
Arrival
Weekly Schedule

  1. FI680

    Seattle-Tacoma International Airport

    15:40

    SEA

    7h 35m

    Direct

    06:15

    KEF

    S - T - T F S
    Search

  2. FI450

    Keflavík International Airport

    07:40

    KEF

    3h 15m

    Direct

    11:55

    LHR

    S M T W T F S

  3. WS1553

    Seattle-Tacoma International Airport

    10:30

    SEA

    1h 40m

    Direct

    13:10

    YYC

    S M T W T F S
    Search

  4. WS002

    Calgary International Airport

    20:35

    YYC

    8h 30m

    Direct

    12:05

    LHR

    S M T W T F S

  5. FI682

    Seattle-Tacoma International Airport

    19:00

    SEA

    7h 25m

    Direct

    09:25

    KEF

    S M T W T F S
    Search

  6. FI454

    Keflavík International Airport

    16:10

    KEF

    3h 10m

    Direct

    20:20

    LHR

    S M T W T F S

  7. FI682

    Seattle-Tacoma International Airport

    19:00

    SEA

    7h 25m

    Direct

    09:25

    KEF

    S M T W T F S
    Search

  8. FI208

    Keflavík International Airport

    11:00

    KEF

    3h 10m

    Direct

    16:10

    CPH

    S M T W T F S

  9. SK1501

    Copenhagen Airport

    20:40

    CPH

    2h

    Direct

    21:40

    LHR

    S M T W T - S

  10. FI680

    Seattle-Tacoma International Airport

    15:40

    SEA

    7h 35m

    Direct

    06:15

    KEF

    S - T - T F S
    Search

  11. FI454

    Keflavík International Airport

    16:10

    KEF

    3h 10m

    Direct

    20:20

    LHR

    S M T W T F S

  12. UA8250

    Seattle-Tacoma International Airport

    19:15

    SEA

    1h 7m

    Direct

    20:22

    YVR

    S M T W T F S
    Search

  13. UA8582

    Vancouver International Airport

    20:10

    YVR

    9h 10m

    Direct

    13:20

    LHR

    S M T W T F S

  14. FI682

    Seattle-Tacoma International Airport

    19:00

    SEA

    7h 25m

    Direct

    09:25

    KEF

    S M T W T F S
    Search

  15. FI450

    Keflavík International Airport

    07:40

    KEF

    3h 15m

    Direct

    11:55

    LHR

    S M T W T F S
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About Seattle-Tacoma International Airport and Heathrow Airport

Learn about Seattle-Tacoma International Airport (SEA) and Heathrow Airport (LHR) — including location, terminals, transportation, and travel tips.

Flight distance 7,711.31km
Cheapest one-way ticket price DKK 1,738
Cheapest return ticket price DKK 3,516

FAQs for Seattle-Tacoma International Airport to Heathrow Airport Flights

  • How long is the flight from Seattle-Tacoma International Airport to Heathrow Airport?

    Seattle-Tacoma International Airport to Heathrow Airport takes about 8 hours 48 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 8 daily flights from Seattle-Tacoma International Airport (SEA) to Heathrow Airport (LHR).
  • The earliest flight from Seattle-Tacoma International Airport to Heathrow Airport departs at 13:30, and the last departs at 21:50, with about 5 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from Seattle-Tacoma International Airport (SEA) to Heathrow Airport (LHR) is quite popular. Without considering departure times or holidays, tickets cost around DKK 5,733 in December, the most expensive month to book this route.
    • The distance from London Gatwick Airport to downtown is about 39km, by taxi about 50 minutes.
    • The distance from Heathrow Airport to downtown is about 23km, by taxi about 40 minutes.
    • The distance from London Luton Airport to downtown is about 44km, by taxi about 1 hour.
  • British Airways is a very popular airline operating an average of 2873 flights per month.
  • One-way flights from Seattle-Tacoma International Airport to Heathrow Airport currently start from DKK 1,738, and round-trip fares start from DKK 3,516. The current lowest fare is a Icelandair flight departing on Thu, Nov 5; prices may vary depending on availability.
  • Yes. British Airways, Alaska Airlines, Delta Air Lines and Virgin Atlantic operate direct flights from Seattle-Tacoma International Airport to Heathrow Airport, with an average flight time of 8 hours 41 minutes, and around 35 weekly flights. Actual flight frequency may vary by season.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from Seattle-Tacoma International Airport to Heathrow Airport is DKK 3,511. Prices may vary depending on the departure date, airline, and availability.
  • Seattle-Tacoma International Airport to Heathrow Airport operates around 34 weekly flights, mainly by British Airways, Alaska Airlines and Delta Air Lines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter Seattle-Tacoma International Airport and Heathrow Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

Find Cheap Flights with Trip.com

Note: Prices shown on this page are the estimated lowest prices and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed on this page are all-inclusive (including taxes, fuel surcharges, civil aviation development fund, etc.), with all fees confirmed before payment. Fees for luggage, meals, Wi-Fi, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours—sometimes even in real time. The more popular the route, the more accurate the data.

Change & Cancellation Policy

Trip.com shows the cancellation and change policies for each flight ticket during the booking process, including any fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply according to the airline's ticket policy.
Cancellation/change due to a flight schedule change:
If the flight schedule has changed and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please visit the customer support pages.