The calculated distance (air line) between Hegnau and Zürich (Kreis 3) is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Zürich (Kreis 3) is certainly longer, as only the direct route (as the crow flies) between Hegnau and Zürich (Kreis 3) has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles