The calculated distance (air line) between Muang Phôn-Hông and Luang Namtha is approximately 182 miles respectively 293 kilometers.
By car or train, the actual journey to Luang Namtha is certainly longer, as only the direct route (as the crow flies) between Muang Phôn-Hông and Luang Namtha has been calculated here.
Air line (approximately)
293 kilometers
158 nautical miles