The calculated distance (air line) between Sint-Martens-Lennik and Borgerhout is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Borgerhout is certainly longer, as only the direct route (as the crow flies) between Sint-Martens-Lennik and Borgerhout has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles