The calculated distance (air line) between Blida and Ksar el Boukhari is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Ksar el Boukhari is certainly longer, as only the direct route (as the crow flies) between Blida and Ksar el Boukhari has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles