The calculated distance (air line) between Dayr Sāmit and Khān Yūnis is approximately 41 miles respectively 66 kilometers.
By car or train, the actual journey to Khān Yūnis is certainly longer, as only the direct route (as the crow flies) between Dayr Sāmit and Khān Yūnis has been calculated here.
Air line (approximately)
66 kilometers
36 nautical miles