The calculated distance (air line) between Zürich (Kreis 3) / Alt-Wiedikon and Frauenfeld is approximately 22 miles respectively 36 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 3) / Alt-Wiedikon and Frauenfeld has been calculated here.
Air line (approximately)
36 kilometers
20 nautical miles