The calculated distance (air line) between Kuwait City and Ar Rumaythīyah is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Ar Rumaythīyah is certainly longer, as only the direct route (as the crow flies) between Kuwait City and Ar Rumaythīyah has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles