The calculated distance (air line) between Hennaya and Sidi Bel Abbes is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Sidi Bel Abbes is certainly longer, as only the direct route (as the crow flies) between Hennaya and Sidi Bel Abbes has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles