The calculated distance (air line) between Uijeongbu-si and Hwawŏn is approximately 156 miles respectively 252 kilometers.
By car or train, the actual journey to Hwawŏn is certainly longer, as only the direct route (as the crow flies) between Uijeongbu-si and Hwawŏn has been calculated here.
Air line (approximately)
252 kilometers
136 nautical miles