The calculated distance (air line) between Montecatini-Terme and San Miniato Basso is approximately 13 miles respectively 22 kilometers.
By car or train, the actual journey to San Miniato Basso is certainly longer, as only the direct route (as the crow flies) between Montecatini-Terme and San Miniato Basso has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles