The calculated distance (air line) between Wezembeek-Oppem and Mouscron is approximately 57 miles respectively 91 kilometers.
By car or train, the actual journey to Mouscron is certainly longer, as only the direct route (as the crow flies) between Wezembeek-Oppem and Mouscron has been calculated here.
Air line (approximately)
91 kilometers
49 nautical miles