The calculated distance (air line) between Ar Rumaythīyah and Omīdīyeh is approximately 140 miles respectively 225 kilometers.
By car or train, the actual journey to Omīdīyeh is certainly longer, as only the direct route (as the crow flies) between Ar Rumaythīyah and Omīdīyeh has been calculated here.
Air line (approximately)
225 kilometers
121 nautical miles