The calculated distance (air line) between Kfar Saba and Umm el Faḥm is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Umm el Faḥm is certainly longer, as only the direct route (as the crow flies) between Kfar Saba and Umm el Faḥm has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles