The calculated distance (air line) between Monceau-sur-Sambre and Mouscron is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Mouscron is certainly longer, as only the direct route (as the crow flies) between Monceau-sur-Sambre and Mouscron has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles