The calculated distance (air line) between Ulsan and Yangp'yŏng is approximately 169 miles respectively 272 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Ulsan and Yangp'yŏng has been calculated here.
Air line (approximately)
272 kilometers
147 nautical miles