To get to the Catalonia Barcelona Plaza Hotel from Barcelona Airport, you have several options:

1. Taxi: The most convenient way is to take a taxi directly from the airport. The journey typically takes around 20-30 minutes, depending on traffic.
2. Aerobus: You can take the Aerobus (A1 or A2) from the airport to Plaça Espanya. The hotel is located right at Plaça Espanya, so it’s just a short walk from the bus stop. The Aerobus runs every 5-10 minutes and the trip takes about 20-25 minutes.
3. Train: Take the R2 Nord train from the airport to Barcelona Sants station. From there, you can either walk (about 15 minutes) or take the metro (Line 3 or Line 1) to Plaça Espanya.
4. Metro: You can take the L9 Sud metro line from the airport to the Torrassa station, then transfer to Line 1 and get off at Plaça Espanya. The total travel time is around 40-45 minutes.
5. Bus: Several local buses also connect the airport to Plaça Espanya, including the 46 bus. This option might take longer due to multiple stops.