The calculated distance (air line) between Sŭngho 1-tong and Ŭllyul is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Ŭllyul is certainly longer, as only the direct route (as the crow flies) between Sŭngho 1-tong and Ŭllyul has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles