The calculated distance (air line) between Mevasseret Tsiyyon and Kiryat Gat is approximately 26 miles respectively 42 kilometers.
By car or train, the actual journey to Kiryat Gat is certainly longer, as only the direct route (as the crow flies) between Mevasseret Tsiyyon and Kiryat Gat has been calculated here.
Air line (approximately)
42 kilometers
23 nautical miles