The calculated distance (air line) between Rostov-na-Donu and Chaltyr is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Chaltyr is certainly longer, as only the direct route (as the crow flies) between Rostov-na-Donu and Chaltyr has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles