The calculated distance (air line) between Stuttgart and Zürich (Kreis 8) is approximately 103 miles respectively 165 kilometers.
By car or train, the actual journey to Zürich (Kreis 8) is certainly longer, as only the direct route (as the crow flies) between Stuttgart and Zürich (Kreis 8) has been calculated here.
Air line (approximately)
165 kilometers
89 nautical miles