The calculated distance (air line) between Altstätten and Zürich (Kreis 10) is approximately 49 miles respectively 79 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 Altstätten and Zürich (Kreis 10) has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles