The calculated distance (air line) between Knyaginino and Nizhniy Novgorod is approximately 53 miles respectively 85 kilometers.
By car or train, the actual journey to Nizhniy Novgorod is certainly longer, as only the direct route (as the crow flies) between Knyaginino and Nizhniy Novgorod has been calculated here.
Air line (approximately)
85 kilometers
46 nautical miles