The calculated distance (air line) between Frankfurt am Main and Heidenheim an der Brenz is approximately 119 miles respectively 192 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 Frankfurt am Main and Heidenheim an der Brenz has been calculated here.
Air line (approximately)
192 kilometers
104 nautical miles