The calculated distance (air line) between Zürich (Kreis 3) / Friesenberg and Sitten is approximately 95 miles respectively 154 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 3) / Friesenberg and Sitten has been calculated here.
Air line (approximately)
154 kilometers
83 nautical miles