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