The calculated distance (air line) between Fès al Bali and Sidi Slimane is approximately 57 miles respectively 92 kilometers.
By car or train, the actual journey to Sidi Slimane is certainly longer, as only the direct route (as the crow flies) between Fès al Bali and Sidi Slimane has been calculated here.
Air line (approximately)
92 kilometers
50 nautical miles