Pls it is possible to buy one day ticket for buses? I found on website only the tickets for 5 days or more. Thanks
I will be going from the airport near Charlestown (bus stop Melville close) and then to the city centre and back
You can pay cash on the bus
Check our dublinbus.ie
Are you going from the airport to Charlestown near Finglas? If so although it's close as the crow flies to the airport you would have to take a bus to town nd then another out to Charlestown. Alternatively consider a taxi from the airport.
If you opt for bus this website is handy for figuring out routes - you might need to look at the possibility of getting the leap Visitor Card as mentioned earlier.