The calculated distance (air line) between Basel and Zürich (Kreis 11) is approximately 45 miles respectively 73 kilometers.
By car or train, the actual journey to Zürich (Kreis 11) is certainly longer, as only the direct route (as the crow flies) between Basel and Zürich (Kreis 11) has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles