Aircoach blue buses: premium option €12 return to temple bar/trinity college. Fastest route, most comfortable seats, worth the extra euros if you're not counting every cent.

airlink 747 official dublin bus: €7 single €12 return to o'connell street/eden quay. 30-45 minutes depending on city traffic. Accepts leap card or contactless. Various stops throughout northside and southside.

regular dublin bus routes 16/41: cheapest option €3.30 with leap card. Takes 60+ minutes, less luggage space but connects more dublin neighbourhoods beyond city centre.

never take airport taxis unless it's after midnight buses stop running. €35-45 for same journey that costs €7 on airlink. Taxi drivers sometimes take longer routes for higher fares.