The calculated distance (air line) between Kfar Saba and Kiryat Gat is approximately 40 miles respectively 64 kilometers.
By car or train, the actual journey to Kiryat Gat is certainly longer, as only the direct route (as the crow flies) between Kfar Saba and Kiryat Gat has been calculated here.
Air line (approximately)
64 kilometers
35 nautical miles