The calculated distance (air line) between Fucecchio and Castelfranco di Sotto is approximately 3 miles respectively 5 kilometers.
By car or train, the actual journey to Castelfranco di Sotto is certainly longer, as only the direct route (as the crow flies) between Fucecchio and Castelfranco di Sotto has been calculated here.
Air line (approximately)
5 kilometers
3 nautical miles