The calculated distance (air line) between Thái Nguyên and Sơn Tây is approximately 38 miles respectively 62 kilometers.
By car or train, the actual journey to Sơn Tây is certainly longer, as only the direct route (as the crow flies) between Thái Nguyên and Sơn Tây has been calculated here.
Air line (approximately)
62 kilometers
33 nautical miles