The opposite side of the world from Porto (OPO)
Francisco de Sá Carneiro Airport — 41.25°N, 8.68°W
Exact antipodal point
41.25°S, 171.32°E
Nearest airport to that point
Westport, New Zealand WSZ
Westport Airport
This is a genuinely close pairing — the airport sits just 59 km from the exact antipodal point.
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Of the maximum possible
99.7%
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.