The calculated distance (air line) between Zürich (Kreis 7) / Witikon and Sitten is approximately 98 miles respectively 157 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 7) / Witikon and Sitten has been calculated here.
Air line (approximately)
157 kilometers
85 nautical miles