The calculated distance (air line) between Volgograd and Novyy Rogachik is approximately 20 miles respectively 33 kilometers.
By car or train, the actual journey to Novyy Rogachik is certainly longer, as only the direct route (as the crow flies) between Volgograd and Novyy Rogachik has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles