The calculated distance (air line) between Rostov-na-Donu and Armavir is approximately 169 miles respectively 272 kilometers.
By car or train, the actual journey to Armavir is certainly longer, as only the direct route (as the crow flies) between Rostov-na-Donu and Armavir has been calculated here.
Air line (approximately)
272 kilometers
147 nautical miles