The calculated distance (air line) between Rostov-na-Donu and Kirovskaya is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Kirovskaya is certainly longer, as only the direct route (as the crow flies) between Rostov-na-Donu and Kirovskaya has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles