The calculated distance (air line) between Castelfidardo and Reggio nell'Emilia is approximately 168 miles respectively 271 kilometers.
By car or train, the actual journey to Reggio nell'Emilia is certainly longer, as only the direct route (as the crow flies) between Castelfidardo and Reggio nell'Emilia has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles