The calculated distance (air line) between San Pietro in Casale and Sasso Marconi is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Sasso Marconi is certainly longer, as only the direct route (as the crow flies) between San Pietro in Casale and Sasso Marconi has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles