The calculated distance (air line) between Bochum-Hordel and Diepenbeek is approximately 86 miles respectively 139 kilometers.
By car or train, the actual journey to Diepenbeek is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Diepenbeek has been calculated here.
Air line (approximately)
139 kilometers
75 nautical miles