The calculated distance (air line) between Chertkovo and Rostov-na-Donu is approximately 150 miles respectively 241 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 Chertkovo and Rostov-na-Donu has been calculated here.
Air line (approximately)
241 kilometers
130 nautical miles