The calculated distance (air line) between Sinŭiju and Hwangju-ŭp is approximately 123 miles respectively 198 kilometers.
By car or train, the actual journey to Hwangju-ŭp is certainly longer, as only the direct route (as the crow flies) between Sinŭiju and Hwangju-ŭp has been calculated here.
Air line (approximately)
198 kilometers
107 nautical miles