The calculated distance (air line) between Dien Bien Phu and Tuyên Quang is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Tuyên Quang is certainly longer, as only the direct route (as the crow flies) between Dien Bien Phu and Tuyên Quang has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles