The calculated distance (air line) between Zürich (Kreis 2) / Wollishofen and Sitten is approximately 95 miles respectively 153 kilometers.
By car or train, the actual journey to Sitten is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 2) / Wollishofen and Sitten has been calculated here.
Air line (approximately)
153 kilometers
82 nautical miles