The calculated distance (air line) between Naberezhnyye Chelny and Mendeleyevsk is approximately 13 miles respectively 22 kilometers.
By car or train, the actual journey to Mendeleyevsk is certainly longer, as only the direct route (as the crow flies) between Naberezhnyye Chelny and Mendeleyevsk has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles