The calculated distance (air line) between Bīr el Maksūr and Kiryat Gat is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Kiryat Gat is certainly longer, as only the direct route (as the crow flies) between Bīr el Maksūr and Kiryat Gat has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles