The opposite side of the world from Chicago (ORD)
Chicago O'Hare International Airport — 41.98°N, 87.90°W
Exact antipodal point
41.98°S, 92.10°E
Nearest airport to that point
Albany, Australia ALH
Albany Airport
The exact point falls in open water or empty terrain: the nearest airport is 2,361 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
88.2%
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.