The calculated distance (air line) between Nizhniy Novgorod and Chkalovsk is approximately 42 miles respectively 67 kilometers.
By car or train, the actual journey to Chkalovsk is certainly longer, as only the direct route (as the crow flies) between Nizhniy Novgorod and Chkalovsk has been calculated here.
Air line (approximately)
67 kilometers
36 nautical miles