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