The calculated distance (air line) between Zürich (Kreis 9) / Altstetten and Chur is approximately 62 miles respectively 99 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 9) / Altstetten and Chur has been calculated here.
Air line (approximately)
99 kilometers
54 nautical miles