The calculated distance (air line) between Kfar Yasif and Kfar Saba is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Kfar Saba is certainly longer, as only the direct route (as the crow flies) between Kfar Yasif and Kfar Saba has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles