The calculated distance (air line) between Jettingen-Scheppach and Diedorf is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Diedorf is certainly longer, as only the direct route (as the crow flies) between Jettingen-Scheppach and Diedorf has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles