The calculated distance (air line) between Collegno and Reggio nell'Emilia is approximately 152 miles respectively 245 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 Collegno and Reggio nell'Emilia has been calculated here.
Air line (approximately)
245 kilometers
132 nautical miles