The calculated distance (air line) between Davos and Zürich (Kreis 3) is approximately 74 miles respectively 118 kilometers.
By car or train, the actual journey to Zürich (Kreis 3) is certainly longer, as only the direct route (as the crow flies) between Davos and Zürich (Kreis 3) has been calculated here.
Air line (approximately)
118 kilometers
64 nautical miles