The calculated distance (air line) between Beni Mester and Sidi Bel Abbes is approximately 50 miles respectively 80 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 Beni Mester and Sidi Bel Abbes has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles