The calculated distance (air line) between Lucca and Santa Croce sull'Arno is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Santa Croce sull'Arno is certainly longer, as only the direct route (as the crow flies) between Lucca and Santa Croce sull'Arno has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles