The calculated distance (air line) between Sidi Bel Abbes and Tlemcen is approximately 44 miles respectively 71 kilometers.
By car or train, the actual journey to Tlemcen is certainly longer, as only the direct route (as the crow flies) between Sidi Bel Abbes and Tlemcen has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles