The calculated distance (air line) between Buchs and Zürich (Kreis 10) is approximately 49 miles respectively 78 kilometers.
By car or train, the actual journey to Zürich (Kreis 10) is certainly longer, as only the direct route (as the crow flies) between Buchs and Zürich (Kreis 10) has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles