The calculated distance (air line) between Montignies-sur-Sambre and Borgerhout is approximately 55 miles respectively 89 kilometers.
By car or train, the actual journey to Borgerhout is certainly longer, as only the direct route (as the crow flies) between Montignies-sur-Sambre and Borgerhout has been calculated here.
Air line (approximately)
89 kilometers
48 nautical miles