The calculated distance (air line) between Stuttgart and Heidenheim an der Brenz is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Heidenheim an der Brenz is certainly longer, as only the direct route (as the crow flies) between Stuttgart and Heidenheim an der Brenz has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles