The calculated distance (air line) between Krasnogvardeyskoye and Rostov-na-Donu is approximately 146 miles respectively 234 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 Krasnogvardeyskoye and Rostov-na-Donu has been calculated here.
Air line (approximately)
234 kilometers
126 nautical miles