The calculated distance (air line) between Zürich (Kreis 3) / Alt-Wiedikon and Basel is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Basel is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 3) / Alt-Wiedikon and Basel has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles