The calculated distance (air line) between Koksovyy and Rostov-na-Donu is approximately 79 miles respectively 128 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 Koksovyy and Rostov-na-Donu has been calculated here.
Air line (approximately)
128 kilometers
69 nautical miles