The calculated distance (air line) between Thái Nguyên and Thái Bình is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Thái Bình is certainly longer, as only the direct route (as the crow flies) between Thái Nguyên and Thái Bình has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles