The calculated distance (air line) between Prato and Reggio nell'Emilia is approximately 61 miles respectively 98 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 Prato and Reggio nell'Emilia has been calculated here.
Air line (approximately)
98 kilometers
53 nautical miles