The opposite side of the world from Na Thon (Ko Samui Island) (USM)
Samui International Airport — 9.55°N, 100.06°E
Exact antipodal point
9.55°S, 79.94°W
Nearest airport to that point
Chimbote, Peru CHM
FAP Lieutenant Jaime Andres de Montreuil Morales Airport
This is a genuinely close pairing — the airport sits just 161 km from the exact antipodal point.
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Of the maximum possible
99.2%
No two points on Earth can be more than about 20,015 km apart.
The antipode is found by negating the latitude and shifting the longitude by 180°. Distances use the haversine formula on a sphere of mean radius 6,371.0088 km. Airport coordinates come from the public-domain OurAirports dataset.