Agree with davidjo, below. Very easy, economical trip and in my opinion well worth a half-day (or even a full day, which is how long I spent there.) And especially worth it if you get out of Howth downtown area/seaside area and walk up into the residential/commercial areas.
Although on the way back--especially if you leave around 6 p.m. like I did--the train was fairly full. There were still some empty seats, but not a lot.
DART (Dublin Area Rapid Transport System) operates trains every 30 minutes or so from Connolly Street Station, a trip that takes around 30 minutes. I paid 6 euro for a return ticket which i though was very economic. If you want a good view it is best to sit on the left, but there should be plenty of vacant seats as my train was almost empty. And when you return Howth Station is at the end of the line so no need to rush for a seat.
DART (Dublin Area Rapid Transport) is the train line running along Dublins coastline, from Malahide and Howth southwards as far as Greystones, Co Wicklow. The Dart service connects with Mainline services to other cities in Ireland and even to Belfast in Northern Ireland.
From Dublins Tara Street station I caught the train to Sutton (as I wanted to visit Phil Lynotts grave and see this small town) then caught the DART service from Sutton to Howth, before returning to Dublin Connolly station.
I was surprised to find that I couldn't purchase a 'Day Saver' ticket. Instead I ended up buying separate tickets for each leg of my trip.
Howth to Dublin single fare is 2.30 Euros.
Visiting Malahide Castle from Howth is quite easy, take the DART train from Howth to Howth Junction and then change trains to go to Malahide. The attraction to see in Malahide is Malahide Castle, a 15-20 minute walk from the train station. The train ride wasn't long at all and connecting to the Malahide train was easy as Malahide is the terminus for that line, just look for it on the overhead boards.
I took the DART (Dublin Area Rapid Transit) train to get to Howth from Dublin and from Howth to Malahide. They are comfortable commuter trains and after the first ride, I found them quite easy to figure out as there are overhead boards on the track telling you the next destination. There were frequent trains in the morning from Dublin to Howth, by mid afternoon, they were running less frequently and I had to wait for 20-25 minutes for a train, you can check the schedule at the station to time your journey better.
Since I was doing a lot of traveling that day, I bought a day rambler pass for 8.30€ from the ticket desk at Pearse station in Dublin, you can also buy from the machines. If you are just going to Howth and back from Dublin or even Dublin-Howth-Malahide-Dublin, it's cheaper to buy a return ticket or single tickets but as I took 6 separate journeys in one day, it was more cost effective to have the pass. I also saw a family day rambler pass advertised, the DART website doesn't seem to have info on the day rambler passes but they do exist.
The DART station in Howth was in walking distance of everything I wanted to see, no need to make bus connections.
To get to Howth from Dublin we walked over to Conolly Station, located on the north side of the River Liffey. We stopped by the customer service booth to find out when the next train for Howth would be leaving (and at the same time found out how it's pronounced - it rhymes with "both") and got our tickets - if I remember correctly, it was 4.50 Euros for a roundtrip ticket. DART trains run between Dublin and Howth every 20 minutes or so, and it takes about 30 minutes to get there. The train station in Howth is located just a short walk away from the harbour and all of the main attractions.
DART (Dublin Area Rapid Transport) is the train going through Dublin to the villages and towns (suburbs) north and south of Dublin. It is very convenient to use if your doing a daytrip to visit the places along the coast.
Tickets can be bought from machines or the booking-office . At Connolly Station the line for buying the ticket was very long early in the morning, but it was also very quick.
I went to Malahide and Howth on the same day. I was told to get a day ticket for 7.20 Euro. I wanted to ask if it wasn’t cheaper to buy single tickets, but the clerk interrupted and said it was better for me to have a day ticket as I was going to hop on and off trains during the day. Well, looking at the website I can see it would have been cheaper to buy single tickets: Dublin - Malahide 2 Euro, Malahide - Howth 2 Euro and Howth - Dublin 2 Euro.
The trains to Malahide or Howth takes about 30 minutes and are running every 20 - 30 minutes.
Going from Malahide to Howth you take the DART back to Howth Junction and change there.
Howth has it's own suburban rail station (DART). It's the northern terminus for the DART.
Howth to the city centre via DART is about 30-40 mins.
Please see my Dublin city transport tips for more information about the DART.
The easiest and quickest way to get to Howth is via the DART. The ticket was 1.90 Euro one way and took about 25-30 minutes to get there.
Howth is the very last stop, so don't hop off at the Howth Junction stop (which is several stops before the actual Howth stop). You know you're getting close when you see the sea on to the left of the train. =)
There is one DART line running through Dublin from north to south. Take it north and you end up in Howth. I got a day ticket [which was around 6 euros if I remember right] and also visited other DART stops at Malahide and Bray in the south. Its a good way to see some of the suburbs and surrounding towns and to escape the busy city for a day!
The fare from Howth to Malahide is also 1.70 Euro. Once you arrive at the DART station in Malahide it's only a few minutes walk to Malahide Castle.
There's also a beautiful church right next to the station if you're interested in exploring it while you wait for the train.
I jumped on the DART and rode it to Sutton Station (two stops from Howth) where Peter picked me up and drove me the rest of the way.
From Dublin (the station is City Centre, or Connoly Station) to Howth cost 1.70 Euro one way or you can purchase a one day ticket for 3 Euro. It takes about 25 minutes.