The calculated distance (air line) between Basel and Zürich (Kreis 3) is approximately 46 miles respectively 73 kilometers.
By car or train, the actual journey to Zürich (Kreis 3) is certainly longer, as only the direct route (as the crow flies) between Basel and Zürich (Kreis 3) has been calculated here.
Air line (approximately)
73 kilometers
40 nautical miles