The calculated distance (air line) between Sepang and Kuala Sungai Baru is approximately 30 miles respectively 49 kilometers.
By car or train, the actual journey to Kuala Sungai Baru is certainly longer, as only the direct route (as the crow flies) between Sepang and Kuala Sungai Baru has been calculated here.
Air line (approximately)
49 kilometers
26 nautical miles