The calculated distance (air line) between Dayr al ‘Aşāfīr and Idlib is approximately 171 miles respectively 275 kilometers.
By car or train, the actual journey to Idlib is certainly longer, as only the direct route (as the crow flies) between Dayr al ‘Aşāfīr and Idlib has been calculated here.
Air line (approximately)
275 kilometers
148 nautical miles