The calculated distance (air line) between Sŭngjibaegam and Hepingjie is approximately 112 miles respectively 181 kilometers.
By car or train, the actual journey to Hepingjie is certainly longer, as only the direct route (as the crow flies) between Sŭngjibaegam and Hepingjie has been calculated here.
Air line (approximately)
181 kilometers
98 nautical miles