The calculated distance (air line) between Baytā al Fawqā and Khān Yūnis is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Khān Yūnis is certainly longer, as only the direct route (as the crow flies) between Baytā al Fawqā and Khān Yūnis has been calculated here.
Air line (approximately)
129 kilometers
69 nautical miles