The calculated distance (air line) between Kantemirovka and Rostov-na-Donu is approximately 171 miles respectively 276 kilometers.
By car or train, the actual journey to Rostov-na-Donu is certainly longer, as only the direct route (as the crow flies) between Kantemirovka and Rostov-na-Donu has been calculated here.
Air line (approximately)
276 kilometers
149 nautical miles