The calculated distance (air line) between Uijeongbu-si and Wŏnju is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Wŏnju is certainly longer, as only the direct route (as the crow flies) between Uijeongbu-si and Wŏnju has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles