The calculated distance (air line) between Kreuzlingen and Zürich (Kreis 11) is approximately 34 miles respectively 55 kilometers.
By car or train, the actual journey to Zürich (Kreis 11) is certainly longer, as only the direct route (as the crow flies) between Kreuzlingen and Zürich (Kreis 11) has been calculated here.
Air line (approximately)
55 kilometers
30 nautical miles