The calculated distance (air line) between Póvoa de Santa Iria and Setúbal is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Setúbal is certainly longer, as only the direct route (as the crow flies) between Póvoa de Santa Iria and Setúbal has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles