The calculated distance (air line) between Ar Rābiyah and Al Khafjī is approximately 68 miles respectively 110 kilometers.
By car or train, the actual journey to Al Khafjī is certainly longer, as only the direct route (as the crow flies) between Ar Rābiyah and Al Khafjī has been calculated here.
Air line (approximately)
110 kilometers
59 nautical miles