The cheapest way in. Nothing listed is quicker.
FL1, FL5, port shuttle and Grimaldi ferry to Cagliari
FL1FL5Port shuttleGrimaldi · Trenitalia, Port Mobility and Grimaldi LinesPickup, hours & luggage
Boards at. Fiumicino Aeroporto station, inside the airport
Two tickets: EUR 11.00 for the one Trenitalia regional ticket from Fiumicino Aeroporto to Civitavecchia, and at most EUR 30 for a deck place (Ponte) on Grimaldi, one way, the maximum Grimaldi may charge outside high season. In high season, 1 June to 30 September, the maximum is EUR 35. Grimaldi's online price can be lower. The port shuttle is free.
