The calculated distance (air line) between Yeonil and Uijeongbu-si is approximately 174 miles respectively 279 kilometers.
By car or train, the actual journey to Uijeongbu-si is certainly longer, as only the direct route (as the crow flies) between Yeonil and Uijeongbu-si has been calculated here.
Air line (approximately)
279 kilometers
151 nautical miles