The calculated distance (air line) between Krasnodar and Staromyshastovskaya is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Staromyshastovskaya is certainly longer, as only the direct route (as the crow flies) between Krasnodar and Staromyshastovskaya has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles