The calculated distance (air line) between Jannātah and Khān Yūnis is approximately 58 miles respectively 94 kilometers.
By car or train, the actual journey to Khān Yūnis is certainly longer, as only the direct route (as the crow flies) between Jannātah and Khān Yūnis has been calculated here.
Air line (approximately)
94 kilometers
51 nautical miles