The opposite side of the world from London (LGW)
London Gatwick Airport — 51.15°N, 0.19°W
Exact antipodal point
51.15°S, 179.81°E
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 862 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
95.7%
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.