The calculated distance (air line) between Saint-Josse-ten-Noode and Mouscron is approximately 51 miles respectively 83 kilometers.
By car or train, the actual journey to Mouscron is certainly longer, as only the direct route (as the crow flies) between Saint-Josse-ten-Noode and Mouscron has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles