The calculated distance (air line) between Dießen am Ammersee and Nürnberg is approximately 104 miles respectively 167 kilometers.
By car or train, the actual journey to Nürnberg is certainly longer, as only the direct route (as the crow flies) between Dießen am Ammersee and Nürnberg has been calculated here.
Air line (approximately)
167 kilometers
90 nautical miles