I don't think there are any non-charter ski destinations from Cork?
I suppose Katowice could be used for skiing in Zakopane, but Poland seems to be a bit off the agenda in Ireland when it comes to skiing destinations.
There are a few routes that are served in Summer that could provide access to ski resorts in Winter - Zurich, Barcelona, Carcassonne, Nice, Bergamo. There could be an opportunity to work with tour operators to make one year-round, but none are ideal. The last four are all 3+ hours from the nearest ski resort, while everything in Switzerland is so expensive, it makes it unattractive for most people looking for a ski holiday.
Geographically GVA is good for access to the French Alps, airports like Lyon and Nice are good too. Toulouse and Barcelona are, more or less, equidistant for the Pyrenees. Innsbruck for the Tyrol is a good option too. It seems that there isn't a strong enough market from Cork. Its a shame because the 2+ hour drive to Dublin and the ~2-3 hour transfer to most resorts adds up.