The opposite side of the world from Chiang Mai (CNX)
Chiang Mai International Airport — 18.77°N, 98.96°E
Exact antipodal point
18.77°S, 81.04°W
Nearest airport to that point
Nazca, Peru NZC
Maria Reiche Neuman Airport
The exact point falls in open water or empty terrain: the nearest airport is 779 km away from it. Roughly 71% of the Earth is ocean, so most antipodes land at sea.
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Of the maximum possible
96.1%
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.