By way of the M8, distance is 253 Kms, time to drive 3 hours or slightly more. Another route by the M7/M8 is 270 Kms and by the M7 279 Kms nearly a 4 hour drive.
There is a motorway between Cork and Dublin, using the M8 and then the M7.
The distance etween Dublin and Cork City is 160 miles. HOWEVER, the distance to County Cork (which is what I think you actually mean) from Dublin is 125 miles.
About 270 kilometres or 168 miles.
About 3 hours, though that will depend on traffic near Dublin and near Cork, which can slow things down.
According to the Irish Tourist Board, the distance between Dublin and Cork City is 160 miles or about 257km however the distance to COUNTY Cork from Dublin is 125 miles. By car, you would be driving for the best part of hours. New and higher quality roads, by-passing a lot of the towns on the way, are opening which quicken the journey.
Dublin and Cork are the names of cities and counties in Ireland.
The driving distance between Derry, Co. Cork, Ireland and Belfast Int'l Airport is approximately 430 km. The driving time would be approximately 5 hours if you were to drive non-stop in good driving conditions. (The driving time does not take into consideration conditions such as weather, road work and rush hour traffic in urban areas.)
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From Dublin you could get to Cork by road, rail or air. Having got to Cork, you can then get a bus to Dunmanway.
You would need to get at least 2 trains, one from Belfast to Dublin and one from Dublin to Cork. They are at different stations, so you would have to travel from one to the other on arriving in Dublin, which you can also do by rail. The whole journey from Belfast to Cork could take between 5 and 6 hours, depending on the times you travel and the connections for the departure times.
Dublin and Cork.
The flight distance from Belgium to Cork, Ireland is: 545 miles / 877 km