The calculated distance (air line) between Bou Arada and Ksar Hellal is approximately 86 miles respectively 138 kilometers.
By car or train, the actual journey to Ksar Hellal is certainly longer, as only the direct route (as the crow flies) between Bou Arada and Ksar Hellal has been calculated here.
Air line (approximately)
138 kilometers
75 nautical miles