The opposite side of the world from Colombo (CMB)
Bandaranaike International Colombo Airport — 7.18°N, 79.88°E
Exact antipodal point
7.18°S, 100.12°W
Nearest airport to that point
Isla Baltra, Ecuador GPS
Seymour Galapagos Ecological Airport
The exact point falls in open water or empty terrain: the nearest airport is 1,324 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
93.4%
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.