The calculated distance (air line) between Niel and Molenbeek-Saint-Jean is approximately 18 miles respectively 29 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 Niel and Molenbeek-Saint-Jean has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles