The calculated distance (air line) between Aosta and Reggio nell'Emilia is approximately 177 miles respectively 284 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 Aosta and Reggio nell'Emilia has been calculated here.
Air line (approximately)
284 kilometers
153 nautical miles