The calculated distance (air line) between Rostov-na-Donu and Kushchyovskaya is approximately 47 miles respectively 75 kilometers.
By car or train, the actual journey to Kushchyovskaya is certainly longer, as only the direct route (as the crow flies) between Rostov-na-Donu and Kushchyovskaya has been calculated here.
Air line (approximately)
75 kilometers
40 nautical miles