The calculated distance (air line) between Rostov-na-Donu and Slavyansk-na-Kubani is approximately 156 miles respectively 252 kilometers.
By car or train, the actual journey to Slavyansk-na-Kubani is certainly longer, as only the direct route (as the crow flies) between Rostov-na-Donu and Slavyansk-na-Kubani has been calculated here.
Air line (approximately)
252 kilometers
136 nautical miles