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LHR → ICN

London to Seoul: distance, flight time and the route it really takes

London Heathrow to Incheon is 8,861 km of great circle — 5,506 mi — and an estimated 11h 31m in the air. It crosses from Europe to Asia.

Great circle
8,861 km
5,506 mi
Estimated in the air
11h 31m
block time
Furthest from equator
66.3°N
at 39% along
One lap of Earth
22.1%
of 40,075 km
The London to Seoul route drawn as a great circle arc on a globe

What the aircraft actually flies over

From London the path crosses United Kingdom, then 642 km of open water, then Sweden, then Finland, then Russia, then Mongolia, then China, then North Korea.

The furthest the great circle gets from the equator is 66.3°N, 39% of the way along.

Flying the line that looks straight on a Mercator map — one constant compass bearing — would cover 10,117 km. That is 1,256 km further, about 14% more, and roughly 1h 34m of extra flying.

From

LHR

London Heathrow

London, United Kingdom · Europe

51.5°N, 0.5°W

Flights to London
To

ICN

Incheon

Seoul, South Korea · Asia

37.5°N, 126.5°E

Flights to Seoul

How these numbers are worked out

The distance is the great circle between the two airports’ real coordinates — the shortest path over a sphere, and the measure airlines and loyalty programmes use. It is computed, not looked up from a table of published routes.

The time is an estimate derived from that distance, using the same arithmetic Orbit uses when you log a flight without timestamps: a typical airliner block speed of 500 mph plus thirty minutes for taxi, climb and descent. Real schedules run longer or shorter depending on winds, air traffic control routing and how far the gate is from the runway. Aircraft also do not fly perfect great circles — jet streams, airspace closures and ETOPS limits all bend the path, usually by a few percent.

Why the shortest path is a curve →

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