The calculated distance (air line) between Thái Nguyên and Lào Cai is approximately 135 miles respectively 217 kilometers.
By car or train, the actual journey to Lào Cai is certainly longer, as only the direct route (as the crow flies) between Thái Nguyên and Lào Cai has been calculated here.
Air line (approximately)
217 kilometers
117 nautical miles