The calculated distance (air line) between Sangsŏng-ni and Chaeryŏng-ŭp is approximately 87 miles respectively 139 kilometers.
By car or train, the actual journey to Chaeryŏng-ŭp is certainly longer, as only the direct route (as the crow flies) between Sangsŏng-ni and Chaeryŏng-ŭp has been calculated here.
Air line (approximately)
139 kilometers
75 nautical miles