The calculated distance (air line) between Sŭngjibaegam and Chasŏng is approximately 113 miles respectively 182 kilometers.
By car or train, the actual journey to Chasŏng is certainly longer, as only the direct route (as the crow flies) between Sŭngjibaegam and Chasŏng has been calculated here.
Air line (approximately)
182 kilometers
98 nautical miles