The calculated distance (air line) between Khān Yūnis and An Nuşayrāt is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to An Nuşayrāt is certainly longer, as only the direct route (as the crow flies) between Khān Yūnis and An Nuşayrāt has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles