The calculated distance (air line) between Parma and Reggio nell'Emilia is approximately 17 miles respectively 27 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 Parma and Reggio nell'Emilia has been calculated here.
Air line (approximately)
27 kilometers
14 nautical miles