The calculated distance (air line) between Bochum and Marburg an der Lahn is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Marburg an der Lahn is certainly longer, as only the direct route (as the crow flies) between Bochum and Marburg an der Lahn has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles