The calculated distance (air line) between Zürich (Kreis 11) / Oerlikon and Sitten is approximately 99 miles respectively 159 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 11) / Oerlikon and Sitten has been calculated here.
Air line (approximately)
159 kilometers
86 nautical miles