The calculated distance (air line) between Zürich (Kreis 12) / Schwamendingen-Mitte 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 12) / Schwamendingen-Mitte and Basel has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles