The calculated distance (air line) between Al Qaţīf and Dār Kulayb is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Dār Kulayb is certainly longer, as only the direct route (as the crow flies) between Al Qaţīf and Dār Kulayb has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles