The calculated distance (air line) between Petushki and Nizhniy Novgorod is approximately 177 miles respectively 285 kilometers.
By car or train, the actual journey to Nizhniy Novgorod is certainly longer, as only the direct route (as the crow flies) between Petushki and Nizhniy Novgorod has been calculated here.
Air line (approximately)
285 kilometers
154 nautical miles