The calculated distance (air line) between Umm as Sāhik and Dhahran is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Dhahran is certainly longer, as only the direct route (as the crow flies) between Umm as Sāhik and Dhahran has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles