The calculated distance (air line) between Bastogne and Molenbeek-Saint-Jean is approximately 85 miles respectively 137 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 Bastogne and Molenbeek-Saint-Jean has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles