The calculated distance (air line) between Dieburg and Bochum-Hordel is approximately 133 miles respectively 214 kilometers.
By car or train, the actual journey to Bochum-Hordel is certainly longer, as only the direct route (as the crow flies) between Dieburg and Bochum-Hordel has been calculated here.
Air line (approximately)
214 kilometers
115 nautical miles