The calculated distance (air line) between Thái Nguyên and Vĩnh Yên is approximately 25 miles respectively 41 kilometers.
By car or train, the actual journey to Vĩnh Yên is certainly longer, as only the direct route (as the crow flies) between Thái Nguyên and Vĩnh Yên has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles