These are part of Dublin Bus' regular services, which means regular prices. Most people use the Airlink or Aircoach services, which are about €6 and €10 respectively. But these buses will bring you to the city centre for about €2. Downside is that the 16A isn't direct to the city centre - you'll take a detour through a few Dublin suburbs. But depending on traffic, you'll be at O'Connell Street in about half an hour to 45 mins. The 746 is better - it takes the same route as the Airlink, the only difference being that it can stop to pick up passengers along the way. It's also infrequent - every hour on the hour. I've often had to rush through the airport to try and catch it! The 16A is more frequent, about 3 or 4 per hour. You'll need exact change for these buses.

At the far left-hand side of the bus terminals in front of the airport.

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