The calculated distance (air line) between Porto Santo Stefano and Reggio nell'Emilia is approximately 158 miles respectively 254 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 Porto Santo Stefano and Reggio nell'Emilia has been calculated here.
Air line (approximately)
254 kilometers
137 nautical miles