The calculated distance (air line) between Belp and Zürich (Kreis 12) is approximately 62 miles respectively 99 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Belp and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
99 kilometers
54 nautical miles