The calculated distance (air line) between Muttenz and Zürich (Kreis 9) is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) is certainly longer, as only the direct route (as the crow flies) between Muttenz and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles