The calculated distance (air line) between Ad Dawḩah and Khān Yūnis is approximately 57 miles respectively 92 kilometers.
By car or train, the actual journey to Khān Yūnis is certainly longer, as only the direct route (as the crow flies) between Ad Dawḩah and Khān Yūnis has been calculated here.
Air line (approximately)
92 kilometers
50 nautical miles