Distance between Helong and North Pyongan is 419.94 km.
This distance is equal to 260.94 miles, and 226.6 nautical miles.
The distance line on map shows distance from Helong to North Pyongan between two cities.
If you travel with an airplane (which has average speed of 560 miles) between Helong to North Pyongan,
It takes 0.47 hours to arrive.