The calculated distance (air line) between Changam-ch’on and P’yŏngsŏng is approximately 181 miles respectively 291 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Changam-ch’on and P’yŏngsŏng has been calculated here.
Air line (approximately)
291 kilometers
157 nautical miles