The calculated distance (air line) between Kowŏn-ŭp and Iwŏn-ŭp is approximately 97 miles respectively 156 kilometers.
By car or train, the actual journey to Iwŏn-ŭp is certainly longer, as only the direct route (as the crow flies) between Kowŏn-ŭp and Iwŏn-ŭp has been calculated here.