The calculated distance (air line) between Smyshlyayevka and Povolzhskiy is approximately 35 miles respectively 57 kilometers.
By car or train, the actual journey to Povolzhskiy is certainly longer, as only the direct route (as the crow flies) between Smyshlyayevka and Povolzhskiy has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles