The calculated distance (air line) between Kazanskaya and Rostov-na-Donu is approximately 130 miles respectively 210 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 Kazanskaya and Rostov-na-Donu has been calculated here.
Air line (approximately)
210 kilometers
113 nautical miles