The calculated distance (air line) between Oberwil and Zürich (Kreis 9) is approximately 44 miles respectively 71 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 Oberwil and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles