The calculated distance (air line) between Dien Bien Phu and Ban Houakhoua is approximately 184 miles respectively 296 kilometers.
By car or train, the actual journey to Ban Houakhoua is certainly longer, as only the direct route (as the crow flies) between Dien Bien Phu and Ban Houakhoua has been calculated here.
Air line (approximately)
296 kilometers
159 nautical miles