The calculated distance (air line) between Choisy-le-Roi and Champigny-sur-Marne is approximately 5 miles respectively 8 kilometers.
By car or train, the actual journey to Champigny-sur-Marne is certainly longer, as only the direct route (as the crow flies) between Choisy-le-Roi and Champigny-sur-Marne has been calculated here.
Air line (approximately)
8 kilometers
4 nautical miles