The calculated distance (air line) between Zürich (Kreis 6) / Unterstrass and Sitten is approximately 98 miles respectively 158 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 6) / Unterstrass and Sitten has been calculated here.
Air line (approximately)
158 kilometers
85 nautical miles