The calculated distance (air line) between Castel Maggiore and San Pietro in Casale is approximately 9 miles respectively 14 kilometers.
By car or train, the actual journey to San Pietro in Casale is certainly longer, as only the direct route (as the crow flies) between Castel Maggiore and San Pietro in Casale has been calculated here.
Air line (approximately)
14 kilometers
8 nautical miles