The calculated distance (air line) between Sīdī Bin Zīnah and Zliten is approximately 153 miles respectively 246 kilometers.
By car or train, the actual journey to Zliten is certainly longer, as only the direct route (as the crow flies) between Sīdī Bin Zīnah and Zliten has been calculated here.
Air line (approximately)
246 kilometers
133 nautical miles