The opposite side of the world from San Juan (SJU)
Luis Munoz Marin International Airport — 18.44°N, 66.00°W
Exact antipodal point
18.44°S, 114.00°E
Nearest airport to that point
Karratha, Australia KTA
Karratha Airport
This is a genuinely close pairing — the airport sits just 385 km from the exact antipodal point.
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Of the maximum possible
98.1%
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.