The calculated distance (air line) between Zürich (Kreis 6) / Unterstrass and Chur is approximately 60 miles respectively 97 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 6) / Unterstrass and Chur has been calculated here.
Air line (approximately)
97 kilometers
52 nautical miles