The calculated distance (air line) between Heppenheim an der Bergstrasse and Münster is approximately 166 miles respectively 268 kilometers.
By car or train, the actual journey to Münster is certainly longer, as only the direct route (as the crow flies) between Heppenheim an der Bergstrasse and Münster has been calculated here.
Air line (approximately)
268 kilometers
144 nautical miles