The calculated distance (air line) between Zürich (Kreis 7) / Fluntern and Basel is approximately 48 miles respectively 77 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 7) / Fluntern and Basel has been calculated here.
Air line (approximately)
77 kilometers
41 nautical miles