Most travelers find the cheapest round-trip airfare to Dublin when booking during the month of March.
Most flyers found that booking flight tickets 60 days in advance of their planned departure date is, on average, the best time to get cheap flights to Dublin.
In general, booking your departure to Dublin for a Wednesday represents the best deal on airfare. Try to avoid a Friday departure to stay away from the highest prices.
Generally, when visiting Dublin, morning flights represent the best value. noon flights are likely to have higher prices.