The calculated distance (air line) between Zürich (Kreis 11) / Oerlikon and Thun is approximately 63 miles respectively 101 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 11) / Oerlikon and Thun has been calculated here.
Air line (approximately)
101 kilometers
55 nautical miles