The calculated distance (air line) between Kovernino and Nizhniy Novgorod is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Nizhniy Novgorod is certainly longer, as only the direct route (as the crow flies) between Kovernino and Nizhniy Novgorod has been calculated here.
Air line (approximately)
90 kilometers
48 nautical miles