The calculated distance (air line) between Choisy-le-Roi and Athis-Mons is approximately 5 miles respectively 7 kilometers.
By car or train, the actual journey to Athis-Mons is certainly longer, as only the direct route (as the crow flies) between Choisy-le-Roi and Athis-Mons has been calculated here.
Air line (approximately)
7 kilometers
4 nautical miles