The calculated distance (air line) between Kaech’ŏn and P’yŏngsŏng is approximately 31 miles respectively 51 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Kaech’ŏn and P’yŏngsŏng has been calculated here.
Air line (approximately)
51 kilometers
27 nautical miles