The calculated distance (air line) between Monthey and Zürich (Kreis 12) is approximately 110 miles respectively 178 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Monthey and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
178 kilometers
96 nautical miles