The calculated distance (air line) between Naberezhnyye Chelny and Leninogorsk is approximately 78 miles respectively 125 kilometers.
By car or train, the actual journey to Leninogorsk is certainly longer, as only the direct route (as the crow flies) between Naberezhnyye Chelny and Leninogorsk has been calculated here.
Air line (approximately)
125 kilometers
67 nautical miles