The calculated distance (air line) between Wenshan City and Dien Bien Phu is approximately 158 miles respectively 253 kilometers.
By car or train, the actual journey to Dien Bien Phu is certainly longer, as only the direct route (as the crow flies) between Wenshan City and Dien Bien Phu has been calculated here.
Air line (approximately)
253 kilometers
137 nautical miles