The calculated distance (air line) between Heppenheim an der Bergstrasse and Bochum is approximately 142 miles respectively 228 kilometers.
By car or train, the actual journey to Bochum is certainly longer, as only the direct route (as the crow flies) between Heppenheim an der Bergstrasse and Bochum has been calculated here.
Air line (approximately)
228 kilometers
123 nautical miles