The opposite side of the world from Adelaide (ADL)
Adelaide International Airport — 34.95°S, 138.53°E
Exact antipodal point
34.95°N, 41.47°W
Nearest airport to that point
Santa Cruz das Flores, Portugal FLW
Flores Airport
The exact point falls in open water or empty terrain: the nearest airport is 1,043 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
94.8%
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.