The calculated distance (air line) between Buchs and Zürich (Kreis 9) is approximately 19 miles respectively 30 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) is certainly longer, as only the direct route (as the crow flies) between Buchs and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles