The calculated distance (air line) between Kraljevo and Smederevska Palanka is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Smederevska Palanka is certainly longer, as only the direct route (as the crow flies) between Kraljevo and Smederevska Palanka has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles