The calculated distance (air line) between Zürich (Kreis 9) / Altstetten and Bellinzona is approximately 86 miles respectively 139 kilometers.
By car or train, the actual journey to Bellinzona is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 9) / Altstetten and Bellinzona has been calculated here.
Air line (approximately)
139 kilometers
75 nautical miles