The calculated distance (air line) between Zürich (Kreis 10) and Frauenfeld is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Frauenfeld is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 10) and Frauenfeld has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles