The calculated distance (air line) between Castelo Branco and Ponte de Sôr is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Ponte de Sôr is certainly longer, as only the direct route (as the crow flies) between Castelo Branco and Ponte de Sôr has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles