Flight Routes from Seattle Tacoma to London Heathrow

Compare cheap outbound and return flights from Seattle-Tacoma (SEA) to London Heathrow (LHR) and find the best offer from numerous airlines and travel agencies.

Trip type
Cheapest roundtrip flight
from€578
Fastest flight
non-stop flights
19x / week
Flight distance
7,710 km
Time difference

Flight schedule from Seattle-Tacoma (SEA) to London Heathrow (LHR)

Select a travel date in the flight schedule for the route from Seattle-Tacoma (SEA) to London Heathrow (LHR) and compare affordable flight deals.

offers
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Matching outbound flightsSEA–LHR · 15 of 15
fromto
dep.arr.
durationstopovers
  1. November 1 – 7, 2026
  2. November 8 – 14, 2026
  3. November 15 – 21, 2026
    1. SEALHR
      1 stopover
      1. Air Canada
    2. SEALHR
      1 stopover
      1. United Airlines
    3. SEALHR
      nonstop
      1. American Airlines
    4. SEALHR
      nonstop
      1. Finnair
    5. SEALHR
      nonstop
      1. British Airways
    6. SEALHR
      nonstop
      1. British Airways
    7. SEALHR
      nonstop
      1. American Airlines
    8. SEALHR
      nonstop
      1. Finnair
    9. SEALHR
      nonstop
      1. British Airways
    10. SEALHR
      nonstop
      1. British Airways
    11. SEALHR
      nonstop
      1. Virgin Atlantic Airways
    12. SEALHR
      1 stopover
      1. Icelandair
    13. SEALHR
      nonstop
      1. Delta Air Lines
    14. SEALHR
      nonstop
      1. British Airways
    15. SEALHR
      nonstop
      1. Alaska Airlines

      Tips and tricks to help you find cheap flights from Seattle Tacoma to London Heathrow

      Favorite airline: Icelandair
      The majority of passengers on the route Seattle-Tacoma – London Heathrow prefer to fly with Icelandair.
      Icelandair
      39 %
      Virgin Atlantic
      23 %
      Air Canada
      14 %
      Direct flights are more expensive
      Flights with a stopover are on average $138.00 cheaper than direct flights.
      non stop flight
      1 stop
      2 stops
      09h 20min
      19h 55min
      20h 00min
      $601
      $463
      $1,060
      Favourite connection: via Reykjavik-Keflavik
      54 % of booked tickets on this route are for flights with a transfer in Reykjavik-Keflavik.
      Route
      bookings
      1 stopover Reykjavik-Keflavik International
      19h 55min, from $463
      54 %
      Direct flights
      09h 20min, from $601
      22 %
      1 stopover Dublin
      13h 45min, from $600
      10 %

      Important flight information

      Discover more flights around Seattle-Tacoma and London Heathrow

      Departure airport Airport Seattle-Tacoma International Airport, WA (SEA)
      Arrival airport Airport London Heathrow (LHR)
      Destination country Flights to United Kingdom
      Departure airport - Destination country Seattle-Tacoma International Airport, WA - United Kingdom
      Departure airport - City-Code Seattle-Tacoma International Airport, WA - London
      Alternative routes to United Kingdom
      Alternative flights to London Heathrow
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