The calculated distance (air line) between Mers el Kebir and Sidi Bel Abbes is approximately 37 miles respectively 60 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 Mers el Kebir and Sidi Bel Abbes has been calculated here.
Air line (approximately)
60 kilometers
33 nautical miles