The cheapest way to the airport. Nothing listed is quicker.
Trenitalia train to Cagliari
Regionale · TrenitaliaPickup, hours & luggage
Boards at. Cagliari station, on Piazza Matteotti
EUR 1.30 single from the machines in the arrivals hall or at the station, or tap a contactless bank card at the validators (TAP&TAP). Bought on the train it costs EUR 5 more. A child under 6 rides free with each paying adult.
Luggage. No luggage charge on the train; bags ride free where there is room.
Hours. Monday to Saturday 05:10–22:00, about every 15 minutes. Sundays and holidays 05:20–22:00, every 20 to 35 minutes. 4 to 7 minutes to the airport.