The calculated distance (air line) between Mondelange and Pont-à-Mousson is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Pont-à-Mousson is certainly longer, as only the direct route (as the crow flies) between Mondelange and Pont-à-Mousson has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles