The calculated distance (air line) between As Sālimīyah and Al Khafjī is approximately 67 miles respectively 107 kilometers.
By car or train, the actual journey to Al Khafjī is certainly longer, as only the direct route (as the crow flies) between As Sālimīyah and Al Khafjī has been calculated here.
Air line (approximately)
107 kilometers
58 nautical miles