The average bus between Castleknock and Arklow takes 2h 8m and the fastest bus takes 1h 40m. There is a bus service every few hours from Castleknock to Arklow. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Buses run hourly between Castleknock and Arklow. The earliest departure is at 7:40 AM in the morning, and the last departure from Castleknock is at 11:05 PM which arrives into Arklow at 1:31 AM. All services require a transfer at Nassau Street and take an average of 2h 8m. The schedules shown below are for the next available departures.

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2h 17m • 1 changeWant to know about travelling from Castleknock to Arklow? 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 bus from Castleknock to Arklow. However, there are services departing from Castleknock station and arriving at Arklow station via Nassau Street station. The journey, including transfers, takes approximately 2h 8m.
Castleknock to Arklow bus services, operated by Dublin Bus, depart from Castleknock station.
Castleknock to Arklow bus services, operated by Expressway (Bus Éireann), arrive at Arklow station.
The distance between Castleknock and Arklow is 65.4 km. The road distance is 78 km.
You can take a bus from Castleknock to Arklow via Nassau Street and Merrion Sq North in around 2h 54m.