The calculated distance (air line) between Sinŭiju and P’yŏngsŏng is approximately 98 miles respectively 158 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Sinŭiju and P’yŏngsŏng has been calculated here.
Air line (approximately)
158 kilometers
85 nautical miles