The calculated distance (air line) between Ulyanovsk and Naberezhnyye Chelny is approximately 186 miles respectively 300 kilometers.
By car or train, the actual journey to Naberezhnyye Chelny is certainly longer, as only the direct route (as the crow flies) between Ulyanovsk and Naberezhnyye Chelny has been calculated here.
Air line (approximately)
300 kilometers
162 nautical miles