The calculated distance (air line) between Kreuzlingen and Zürich (Kreis 4) / Aussersihl is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Zürich (Kreis 4) / Aussersihl is certainly longer, as only the direct route (as the crow flies) between Kreuzlingen and Zürich (Kreis 4) / Aussersihl has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles