The calculated distance (air line) between Ma‘arratmişrīn and Aleppo is approximately 30 miles respectively 49 kilometers.
By car or train, the actual journey to Aleppo is certainly longer, as only the direct route (as the crow flies) between Ma‘arratmişrīn and Aleppo has been calculated here.
Air line (approximately)
49 kilometers
26 nautical miles