The calculated distance (air line) between Montignoso and Montecatini-Terme is approximately 31 miles respectively 51 kilometers.
By car or train, the actual journey to Montecatini-Terme is certainly longer, as only the direct route (as the crow flies) between Montignoso and Montecatini-Terme has been calculated here.
Air line (approximately)
51 kilometers
27 nautical miles