The calculated distance (air line) between Muang Phônsavan and Thakhèk is approximately 177 miles respectively 285 kilometers.
By car or train, the actual journey to Thakhèk is certainly longer, as only the direct route (as the crow flies) between Muang Phônsavan and Thakhèk has been calculated here.
Air line (approximately)
285 kilometers
154 nautical miles