Air Miles Calculator

Distance between London (LHR) and Seattle, WA (SEA)

Flight distance from London to Seattle (London Heathrow Airport – Seattle–Tacoma International Airport) is 4800 miles / 7725 kilometers / 4171 nautical miles. Estimated flight time is 9 hours 35 minutes.

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).

Airport information


A London Heathrow Airport
City: London
Country: United Kingdom Flag of United Kingdom
IATA Code: LHR
ICAO Code: EGLL
Coordinates: 51°28′14″N, 0°27′42″W

B Seattle–Tacoma International Airport
City: Seattle, WA
Country: United States Flag of United States
IATA Code: SEA
ICAO Code: KSEA
Coordinates: 47°26′56″N, 122°18′32″W

Time difference and current local times

The time difference between London and Seattle is 8 hours. Seattle is 8 hours behind London.

Time Difference

London

 GMT

Seattle, WA

 PST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 558 kg (1 230 pounds).

Frequent Flyer Miles Calculator

London (LHR) → Seattle (SEA).

Distance:
4800
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
4800

Round trip?