The calculated distance (air line) between Velikovechnoye and Rostov-na-Donu is approximately 159 miles respectively 255 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 Velikovechnoye and Rostov-na-Donu has been calculated here.
Air line (approximately)
255 kilometers
138 nautical miles