The calculated distance (air line) between Neustadt an der Donau and Nürnberg is approximately 55 miles respectively 88 kilometers.
By car or train, the actual journey to Nürnberg is certainly longer, as only the direct route (as the crow flies) between Neustadt an der Donau and Nürnberg has been calculated here.
Air line (approximately)
88 kilometers
47 nautical miles