The calculated distance (air line) between Muang Phôn-Hông and Xam Nua is approximately 170 miles respectively 274 kilometers.
By car or train, the actual journey to Xam Nua is certainly longer, as only the direct route (as the crow flies) between Muang Phôn-Hông and Xam Nua has been calculated here.
Air line (approximately)
274 kilometers
148 nautical miles