The calculated distance (air line) between Muang Phônsavan and Sainyabuli is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Sainyabuli is certainly longer, as only the direct route (as the crow flies) between Muang Phônsavan and Sainyabuli has been calculated here.
Air line (approximately)
157 kilometers
85 nautical miles