The opposite side of the world from Köln (Cologne) (CGN)
Cologne Bonn Airport — 50.87°N, 7.14°E
Exact antipodal point
50.87°S, 172.86°W
Nearest airport to that point
Te One, New Zealand CHT
Inia William Tuuta Memorial Airport
The exact point falls in open water or empty terrain: the nearest airport is 830 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
95.9%
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.