There is no rail link into the county, the nearest rail stations being Sligo and Derry.
By bus
Bus Ãireann (http://www.buseireann.ie/) run regular daily services from Dublin, Derry, Galway and Sligo to Letterkenny and Donegal Town.
A number of private bus operators, most notably McGeehan (http://www.mcgeehancoache...) and McGinley (http://www.johnmcginley.com/), operate services from Donegal Town and Letterkenny to Dublin also.
Gallagher's Coaches (http://www.gallagherscoac...) operate a twice daily service between Letterkenny, Derry and Belfast.
Lough Swilly Bus Company (http://www.sjp.claranet.c...) runs routes in the north of the county, particularly in the Inishowen area. These include routes between Letterkenny, Buncrana, Malin and Carndonagh to Derry.
Feda O'Donnell Coaches (http://www.fedaodonnell.com/) run regular daily services between Galway and Donegal, which service most of the county.
By plane
Daily flights from Dublin and Glasgow operate to Donegal International Airport, at Carrickfinn, in the northwest of the county. These flights are operated by Aer Arann (http://www.aerarann.ie/)
By car
The county is not served by any motorways. There are three primary routes into Donegal, depending on where you are travelling from. The N15 links the county with Sligo via Bundoran and Ballyshannon. The N2 from Dublin, via Monaghan, links with the N14 to Lifford and Letterkenny while the N13 links with Derry.
Boat
The nearest ferryport is Larne, north of Belfast, connecting to Stranraer and Troon in Scotland. There are buses (http://www.fedaodonnell.com/) (http://www.littleireland....) that run from Scotland to County Donegal, using this ferry route.