The calculated distance (air line) between San Pietro in Casale and Castel San Pietro Terme is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Castel San Pietro Terme is certainly longer, as only the direct route (as the crow flies) between San Pietro in Casale and Castel San Pietro Terme has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles