The calculated distance (air line) between Smyshlyayevka and Otradnyy is approximately 41 miles respectively 65 kilometers.
By car or train, the actual journey to Otradnyy is certainly longer, as only the direct route (as the crow flies) between Smyshlyayevka and Otradnyy has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles