The calculated distance (air line) between Kazan and Naberezhnyye Chelny is approximately 128 miles respectively 206 kilometers.
By car or train, the actual journey to Naberezhnyye Chelny is certainly longer, as only the direct route (as the crow flies) between Kazan and Naberezhnyye Chelny has been calculated here.
Air line (approximately)
206 kilometers
111 nautical miles