The calculated distance (air line) between Khān Shaykhūn and Ar Rastan is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Ar Rastan is certainly longer, as only the direct route (as the crow flies) between Khān Shaykhūn and Ar Rastan has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles