The calculated distance (air line) between Sŭngho 1-tong and Hoeyang is approximately 89 miles respectively 144 kilometers.
By car or train, the actual journey to Hoeyang is certainly longer, as only the direct route (as the crow flies) between Sŭngho 1-tong and Hoeyang has been calculated here.
Air line (approximately)
144 kilometers
78 nautical miles