The calculated distance (air line) between Höchstadt an der Aisch and Nürnberg is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Nürnberg is certainly longer, as only the direct route (as the crow flies) between Höchstadt an der Aisch and Nürnberg has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles