The calculated distance (air line) between Iksan and Yangp'yŏng is approximately 111 miles respectively 178 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Iksan and Yangp'yŏng has been calculated here.
Air line (approximately)
178 kilometers
96 nautical miles