The calculated distance (air line) between Pukchil-lodongjagu and Hongwŏn is approximately 117 miles respectively 189 kilometers.
By car or train, the actual journey to Hongwŏn is certainly longer, as only the direct route (as the crow flies) between Pukchil-lodongjagu and Hongwŏn has been calculated here.
Air line (approximately)
189 kilometers
102 nautical miles