The calculated distance (air line) between Sidi Bou Ali and Ksar Hellal is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Ksar Hellal is certainly longer, as only the direct route (as the crow flies) between Sidi Bou Ali and Ksar Hellal has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles