The calculated distance (air line) between Sŭngho 1-tong and Yŏnan-ŭp is approximately 75 miles respectively 121 kilometers.
By car or train, the actual journey to Yŏnan-ŭp is certainly longer, as only the direct route (as the crow flies) between Sŭngho 1-tong and Yŏnan-ŭp has been calculated here.
Air line (approximately)
121 kilometers
66 nautical miles