The calculated distance (air line) between Komusan Il-tong and Hongwŏn is approximately 170 miles respectively 274 kilometers.
By car or train, the actual journey to Hongwŏn is certainly longer, as only the direct route (as the crow flies) between Komusan Il-tong and Hongwŏn has been calculated here.
Air line (approximately)
274 kilometers
148 nautical miles