The calculated distance (air line) between Tadmur and ‘Ayn al ‘Arab is approximately 161 miles respectively 259 kilometers.
By car or train, the actual journey to ‘Ayn al ‘Arab is certainly longer, as only the direct route (as the crow flies) between Tadmur and ‘Ayn al ‘Arab has been calculated here.
Air line (approximately)
259 kilometers
140 nautical miles