The calculated distance (air line) between Khān Shaykhūn and An Nabk is approximately 98 miles respectively 158 kilometers.
By car or train, the actual journey to An Nabk is certainly longer, as only the direct route (as the crow flies) between Khān Shaykhūn and An Nabk has been calculated here.
Air line (approximately)
158 kilometers
85 nautical miles