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