The calculated distance (air line) between Panghyŏn-dong and Pyongyang is approximately 65 miles respectively 105 kilometers.
By car or train, the actual journey to Pyongyang is certainly longer, as only the direct route (as the crow flies) between Panghyŏn-dong and Pyongyang has been calculated here.
Air line (approximately)
105 kilometers
56 nautical miles