The calculated distance (air line) between Jettingen-Scheppach and Gersthofen is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Gersthofen is certainly longer, as only the direct route (as the crow flies) between Jettingen-Scheppach and Gersthofen has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles