The calculated distance (air line) between Jisr ez Zarqā and Kfar Saba is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Kfar Saba is certainly longer, as only the direct route (as the crow flies) between Jisr ez Zarqā and Kfar Saba has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles