The calculated distance (air line) between Chŏngju and Hwangju-ŭp is approximately 77 miles respectively 124 kilometers.
By car or train, the actual journey to Hwangju-ŭp is certainly longer, as only the direct route (as the crow flies) between Chŏngju and Hwangju-ŭp has been calculated here.
Air line (approximately)
124 kilometers
67 nautical miles