The calculated distance (air line) between Buchrain and Zürich (Kreis 9) is approximately 21 miles respectively 33 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 Buchrain and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles