The calculated distance (air line) between Heppenheim an der Bergstrasse and Mönchengladbach is approximately 144 miles respectively 231 kilometers.
By car or train, the actual journey to Mönchengladbach is certainly longer, as only the direct route (as the crow flies) between Heppenheim an der Bergstrasse and Mönchengladbach has been calculated here.
Air line (approximately)
231 kilometers
125 nautical miles