The calculated distance (air line) between Sierre and Zürich (Kreis 2) is approximately 86 miles respectively 138 kilometers.
By car or train, the actual journey to Zürich (Kreis 2) is certainly longer, as only the direct route (as the crow flies) between Sierre and Zürich (Kreis 2) has been calculated here.
Air line (approximately)
138 kilometers
75 nautical miles