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