From Dublin: €9 fares (one-way, not including taxes, charges, and supplements) to and from Berlin, Bilbao, Brussels, Dusseldorf, Frankfurt, and Madrid; from Cork: €9 fares (also one-way and before taxes) to and from Madrid.
For €19, the route map broadens. From Dublin, there are one-way €19 fares to and from Amsterdam, Bordeaux, Geneva, Hamburg, Milan Linate, Milan Malpensa, Munich, Paris, Santiago de Compostela, Toulouse, Venice, and Warsaw. From Cork, clever Cheapos can snap up one-way fares to and from Prague and Warsaw for €19 before charges.
These fares are available through midnight in Ireland on Thursday, March 29, and they’re good for travel from April 17 through May 31. We’d expect taxes and charges to come to around an additional €40 per round-trip, and—a further caution!—we were unable just now to find the lowest promotional fare on one less-trafficked route. Still, cheap’s cheap, and this fare sale at the very least shouldn’t be ignored.