The calculated distance (air line) between Kafr Qari‘ and Kfar Saba is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Kfar Saba is certainly longer, as only the direct route (as the crow flies) between Kafr Qari‘ and Kfar Saba has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles