To ride the Aerobús, the official shuttle connecting Barcelona-El Prat Airport (BCN) to the city center (Plaça de Catalunya) in 2026, a one-way ticket typically costs €7.75. If you plan to return to the airport, a round-trip ticket is a more supportive value at €13.30, which remains valid for 90 days from the outbound journey. Children under the age of 4 travel for free. For those looking for a "Gold Standard" integration with the city's public transport, combined tickets like the Hola Barcelona Travel Card + Aerobús are available, starting around €28.65 for a 48-hour pass. A grounded peer tip: you can purchase tickets directly from the staff at the bus stop, at automated kiosks, or via the Aerobús app. The buses run every 5 to 10 minutes and provide free Wi-Fi and USB charging ports, making it a reliable and cost-effective alternative to a €35–€45 taxi or the slightly slower L9 Metro line.