The calculated distance (air line) between Zürich (Kreis 4) / Aussersihl and Fribourg is approximately 76 miles respectively 122 kilometers.
By car or train, the actual journey to Fribourg is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 4) / Aussersihl and Fribourg has been calculated here.
Air line (approximately)
122 kilometers
66 nautical miles