The calculated distance (air line) between Koz’modem’yansk and Ulyanovsk is approximately 156 miles respectively 251 kilometers.
By car or train, the actual journey to Ulyanovsk is certainly longer, as only the direct route (as the crow flies) between Koz’modem’yansk and Ulyanovsk has been calculated here.
Air line (approximately)
251 kilometers
135 nautical miles