I think it would be about a 20 minutes to half hour from the airport.
The Phoenix Park is approximately 14 km from Dublin Airport and should as the review above said, take you about 25 to 30 mins to travel by car or taxi. If you are staying in the city centre, you can get a Dublin Bus - the number 37 - to Castleknock Village, and walk to Farmleigh from there. The number 37 bus stop is on Baggot Street in Dublin 2 and can also be accessed on the Quays in Dublin city.
Hope this info helps and it is well worth a visit!!
It's in the Phoenix Park in the city of Dublin.
Taxi is the only direct way from the airport, about 30 minutes max. Cost should be no more than €25-30 euro depending on traffic of course. :)
Otherwise get to the city by one of the airport buses (€6-7 euro) and taxi from there (€8-10 euro)
Its at the furthest end of the park in relation to the city center.
Nice gardens, coffee shop on the lake, and free tour of the old house. Definitely worth a visit. Especially at the weekends they often have outdoor markets and music.
Enjoy your trip!
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