The calculated distance (air line) between Hwangju-ŭp and Yŏngbyŏn is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Yŏngbyŏn is certainly longer, as only the direct route (as the crow flies) between Hwangju-ŭp and Yŏngbyŏn has been calculated here.
Air line (approximately)
127 kilometers
69 nautical miles