The calculated distance (air line) between Zürich (Kreis 3) / Friesenberg and Thun is approximately 59 miles respectively 95 kilometers.
By car or train, the actual journey to Thun is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 3) / Friesenberg and Thun has been calculated here.
Air line (approximately)
95 kilometers
52 nautical miles