The calculated distance (air line) between Việt Trì and Dien Bien Phu is approximately 153 miles respectively 246 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 Việt Trì and Dien Bien Phu has been calculated here.
Air line (approximately)
246 kilometers
133 nautical miles