The calculated distance (air line) between Castanheira do Ribatejo and Setúbal is approximately 33 miles respectively 53 kilometers.
By car or train, the actual journey to Setúbal is certainly longer, as only the direct route (as the crow flies) between Castanheira do Ribatejo and Setúbal has been calculated here.
Air line (approximately)
53 kilometers
28 nautical miles