The calculated distance (air line) between Monthey and Zürich (Kreis 2) is approximately 105 miles respectively 170 kilometers.
By car or train, the actual journey to Zürich (Kreis 2) is certainly longer, as only the direct route (as the crow flies) between Monthey and Zürich (Kreis 2) has been calculated here.
Air line (approximately)
170 kilometers
91 nautical miles