The calculated distance (air line) between Bouillon and Molenbeek-Saint-Jean is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Molenbeek-Saint-Jean is certainly longer, as only the direct route (as the crow flies) between Bouillon and Molenbeek-Saint-Jean has been calculated here.
Air line (approximately)
129 kilometers
70 nautical miles