The calculated distance (air line) between Staromyshastovskaya and Rostov-na-Donu is approximately 134 miles respectively 216 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 Staromyshastovskaya and Rostov-na-Donu has been calculated here.
Air line (approximately)
216 kilometers
116 nautical miles