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
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 · 7 of 7
fromto
dep.arr.
durationstopovers
  1. September 20 – 26, 2026
  2. Sep 27 – Oct 3, 2026
  3. October 4 – 10, 2026
    1. SEALHR
      nonstop
      1. British Airways
    2. SEALHR
      nonstop
      1. Virgin Atlantic Airways
    3. SEALHR
      nonstop
      1. Virgin Atlantic Airways
    4. SEALHR
      nonstop
      1. British Airways
    5. SEALHR
      nonstop
      1. Alaska Airlines
    6. SEALHR
      nonstop
      1. Alaska Airlines
    7. SEALHR
      nonstop
      1. Delta Air Lines

      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
      US$601
      US$463
      US$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 US$463
      54 %
      Direct flights
      09h 20min, from US$601
      22 %
      1 stopover Dublin
      13h 45min, from US$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 flights to London Heathrow
      Flight destinations with a similar price