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