The calculated distance (air line) between Sŭngho 1-tong and Haeju is approximately 67 miles respectively 108 kilometers.
By car or train, the actual journey to Haeju is certainly longer, as only the direct route (as the crow flies) between Sŭngho 1-tong and Haeju has been calculated here.
Air line (approximately)
108 kilometers
58 nautical miles