The calculated distance (air line) between Ma‘arratmişrīn and Dūmā is approximately 169 miles respectively 272 kilometers.
By car or train, the actual journey to Dūmā is certainly longer, as only the direct route (as the crow flies) between Ma‘arratmişrīn and Dūmā has been calculated here.
Air line (approximately)
272 kilometers
147 nautical miles