The opposite side of the world from Boston (BOS)
Boston Logan International Airport — 42.36°N, 71.01°W
Exact antipodal point
42.36°S, 108.99°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 1,124 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
94.4%
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.