The calculated distance (air line) between Sevastopol and Chornomors’k is approximately 182 miles respectively 292 kilometers.
By car or train, the actual journey to Chornomors’k is certainly longer, as only the direct route (as the crow flies) between Sevastopol and Chornomors’k has been calculated here.
Air line (approximately)
292 kilometers
158 nautical miles