The distance from Dubin to Glendalough is only about 30 miles (48 km). Glendalough is a glacial valley in Wicklow County known for its natural beauty and monastic sites. The most comfortable way to get from one place to the other is to drive or use a private transfer. The drive will only take 45 minutes and is sure to be filled with breathtaking sights. Cab services, as well as Uber, are both available from Dublin. Flight and rail service is not available for this route.
If you are still in the planning stages of your trip, take a look at this 6-day Dublin City & Wicklow Walk Itinerary. It combines the best of the city with the best of the countryside, including a pint at the Guinness Storehouse and an overnight stay at Enniskerry—Ireland's most charming village.
If you have more time, this 10-day itinerary covers the northern coastline and includes Dublin.
By Private Transfer or Rental Car
Duration: 45 minutes, more with stops
Private drivers and Uber are easily found in Dublin but you can also rent your own car. Beware of narrow country roads and passing sheep—a smaller rental car is your best bet.
Getting from Dublin to Glendalough takes about 45 minutes along N11, passing through the stunning Wicklow Mountains National Park. The park is really worth a stop, either to enjoy a picnic and take in the natural beauty or enjoy the walking and hiking trails. Just past the park is your destination.
Duration: 1 hour
A bus to Glendalough is run by Transport for Ireland and will only take you an hour. This trip runs 2-3 times per day.