The calculated distance (air line) between Bayt Ḩānūn and Khān Yūnis is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Khān Yūnis is certainly longer, as only the direct route (as the crow flies) between Bayt Ḩānūn and Khān Yūnis has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles