The calculated distance (air line) between Reinach and Zürich (Kreis 12) is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Reinach and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles