The calculated distance (air line) between Sunch’ŏn and P’yŏngsŏng is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Sunch’ŏn and P’yŏngsŏng has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles