The calculated distance (air line) between Onsŏng and Ungsang-nodongjagu is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Ungsang-nodongjagu is certainly longer, as only the direct route (as the crow flies) between Onsŏng and Ungsang-nodongjagu has been calculated here.
Air line (approximately)
77 kilometers
41 nautical miles