The calculated distance (air line) between Sant'Ilario d'Enza and Viadana is approximately 13 miles respectively 20 kilometers.
By car or train, the actual journey to Viadana is certainly longer, as only the direct route (as the crow flies) between Sant'Ilario d'Enza and Viadana has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles