The calculated distance (air line) between Uijeongbu-si and Changnyeong is approximately 172 miles respectively 277 kilometers.
By car or train, the actual journey to Changnyeong is certainly longer, as only the direct route (as the crow flies) between Uijeongbu-si and Changnyeong has been calculated here.
Air line (approximately)
277 kilometers
149 nautical miles