The calculated distance (air line) between Sakiet Sidi Youssef and El Kef is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to El Kef is certainly longer, as only the direct route (as the crow flies) between Sakiet Sidi Youssef and El Kef has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles