The average train between Castleknock and Belfast takes 3h 14m and the fastest train takes 2h 38m. There is a train service every few hours from Castleknock to Belfast. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Trains run hourly between Castleknock and Belfast. The earliest departure is at 6:19 AM in the morning, and the last departure from Castleknock is at 11:37 PM which arrives into Belfast at 7:58 AM. All services require a transfer, and take on average 3h 14m. The schedules shown below are for the next available departures.

2h 46m • 1 change

2h 56m • 1 change
Arrives next day

8h 21m • 1 change

2h 46m • 1 change

2h 46m • 1 change

2h 48m • 1 change

2h 58m • 1 change

2h 58m • 1 change

2h 54m • 1 change

2h 58m • 1 change

2h 58m • 1 change

2h 39m • 1 change

3h 4m • 1 change

2h 40m • 1 change

2h 56m • 1 change

2h 39m • 1 change

3h 4m • 1 change

2h 40m • 1 change

2h 56m • 1 change
Want to know about travelling from Castleknock to Belfast? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct train from Castleknock to Belfast. However, there are services departing from Castleknock station and arriving at Belfast station via Belfast Grand Central. The journey, including transfers, takes approximately 3h 14m.
Castleknock to Belfast train services, operated by Iarnród Éireann (Irish Rail), depart from Dublin Connolly station.
Castleknock to Belfast train services, operated by Iarnród Éireann (Irish Rail), arrive at Belfast Grand Central station.
The distance between Castleknock and Belfast is 139.1 km. The road distance is 189 km.
Iarnród Éireann (Irish Rail) operates a train from Dublin Connolly to Belfast Grand Central hourly. Tickets cost £13–19 and the journey takes 2h 8m. Translink also services this route hourly.