The calculated distance (air line) between Knin and Kaštel Lukšić is approximately 35 miles respectively 56 kilometers.
By car or train, the actual journey to Kaštel Lukšić is certainly longer, as only the direct route (as the crow flies) between Knin and Kaštel Lukšić has been calculated here.
Air line (approximately)
56 kilometers
30 nautical miles