The calculated distance (air line) between Sierre and Zürich (Kreis 12) is approximately 91 miles respectively 147 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Sierre and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
147 kilometers
79 nautical miles