The calculated distance (air line) between Sakchu-ŭp and P’yŏngsŏng is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Sakchu-ŭp and P’yŏngsŏng has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles