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