The calculated distance (air line) between Chaeryŏng-ŭp and Uiju is approximately 137 miles respectively 221 kilometers.
By car or train, the actual journey to Uiju is certainly longer, as only the direct route (as the crow flies) between Chaeryŏng-ŭp and Uiju has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles