The calculated distance (air line) between Zürich (Kreis 7) / Hirslanden and Chur is approximately 58 miles respectively 93 kilometers.
By car or train, the actual journey to Chur is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 7) / Hirslanden and Chur has been calculated here.
Air line (approximately)
93 kilometers
50 nautical miles