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