The calculated distance (air line) between Zürich (Kreis 12) / Saatlen and Sitten is approximately 100 miles respectively 161 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 12) / Saatlen and Sitten has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles