Map of flight path from London to Seattle.
Shortest flight path between London Heathrow Airport (LHR) and Seattle–Tacoma International Airport (SEA).
How far is Seattle from London?
There are several ways to calculate distances between London and Seattle. Here are two common methods:Vincenty's formula (applied above)
- 4800.220 miles
- 7725.205 kilometers
- 4171.277 nautical miles
Vincenty's formula calculates the distance between latitude/longitude points on the earth’s surface, using an ellipsoidal model of the earth.Haversine formula
- 4785.859 miles
- 7702.094 kilometers
- 4158.798 nautical miles
The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance – the shortest distance between two points).
Time difference and current local times
The time difference between London and Seattle is 8 hours. Seattle is 8 hours behind London.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 558 kg (1 230 pounds).
Frequent Flyer Miles Calculator
London (LHR) → Seattle (SEA).