The flight distance from Seattle-Tacoma International Airport to London Heathrow Airport is:

4,800 miles / 7 726 km

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Flight path from SEA to LHR

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Distance from SEA to LHR

The total distance from SEA to LHR is 4,800 miles.

This is equivalent to 7 726 kilometers or 4,171 nautical miles.

Your trip begins at Seattle-Tacoma International Airport in Seattle, Washington.
It ends at London Heathrow Airport in London, United Kingdom.

Your flight direction from SEA to LHR is Northeast (34 degrees from North).

The distance calculator helps you figure out how far it is to fly from SEA to LHR. It does this by computing the straight line flying distance ("as the crow flies"). It uses the great circle formula to compute the total travel mileage.

Seattle-Tacoma International Airport

IATA: SEA
ICAO: KSEA
FAA: SEA
City: Seattle
State: Washington
Zip code: 98168
Country: United States
Category: airports

London Heathrow Airport

IATA: LHR
ICAO: EGLL
City: London
Country: United Kingdom
Category: airports

Flight distance calculator

Travelmath provides an online flight distance calculator to get the distance between cities. You can also compare all types of locations including airports, cities, states, countries, or zip codes to find the distance between any two points. The database uses the latitude and longitude of each location to calculate distance using the great circle distance formula. The calculation is done using the Vincenty algorithm and the WGS84 ellipsoid model of the Earth, which is the same one used by most GPS receivers. This gives you the flying distance "as the crow flies." Find your flight distances quickly to estimate the number of frequent flyer miles you'll accumulate. Or ask how far is it between cities to solve your homework problems. You can lookup U.S. cities, or expand your search to get the world distance for international trips.