Iarnród Éireann train timetables Boyle (Sligo / Dublin Train) to Dublin Connolly Street Station
Boyle to Dublin Connolly- 6.13, 7.39, 9.38, 11.38, 13.38, 15.38 and 18.36.
Connolly to Boyle will depart at 08.00, 11.00, 13.00, 15.00, 16.00, 17.10 and 19.15.
Refer to link for daily timetable https://www.irishrail.ie/IrishRail/media/Timetable-PDF-s/Connolly-DART-timetables/07_dublin_-sligo.pdf