The calculated distance (air line) between Dülmen and Bochum-Hordel is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Bochum-Hordel is certainly longer, as only the direct route (as the crow flies) between Dülmen and Bochum-Hordel has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles