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LHR → BKK

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

London Heathrow to Suvarnabhumi is 9,578 km of great circle — 5,951 mi — and an estimated 12h 24m in the air. It crosses from Europe to Asia.

Great circle
9,578 km
5,951 mi
Estimated in the air
12h 24m
block time
Furthest from equator
53.5°N
at 15% along
One lap of Earth
23.9%
of 40,075 km
The London to Bangkok route drawn as a great circle arc on a globe

What the aircraft actually flies over

From London the path crosses Netherlands, then Germany, then Poland, then Belarus, then Russia, then Kazakhstan, then Uzbekistan, then Kyrgyzstan, then China, then India, then Myanmar, then Thailand.

The furthest the great circle gets from the equator is 53.5°N, 15% of the way along.

Flying the line that looks straight on a Mercator map — one constant compass bearing — would cover 10,079 km. That is 501 km further, about 5% more, and roughly 37m of extra flying.

From

LHR

London Heathrow

London, United Kingdom · Europe

51.5°N, 0.5°W

Flights to London
To

BKK

Suvarnabhumi

Bangkok, Thailand · Asia

13.7°N, 100.7°E

Flights to Bangkok

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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