The calculated distance (air line) between Bochum-Hordel and Halsteren is approximately 125 miles respectively 201 kilometers.
By car or train, the actual journey to Halsteren is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Halsteren has been calculated here.
Air line (approximately)
201 kilometers
109 nautical miles