The calculated distance (air line) between Khān Shaykhūn and Dārayyā is approximately 139 miles respectively 224 kilometers.
By car or train, the actual journey to Dārayyā is certainly longer, as only the direct route (as the crow flies) between Khān Shaykhūn and Dārayyā has been calculated here.
Air line (approximately)
224 kilometers
121 nautical miles