Ireland's least-well-known international airport is in County Mayo, near the shrine of Our Lady of Knock, Queen of Ireland. I know about it mostly because it's pretty close to my family's old homestead in Ballyhaunis. We didn't fly in or out for our one visit four years ago, but I always have it in mind for the future.

If you don't mind traveling with a planeload of devout Catholics, including plenty of priests and nuns, you might consider looking for a low group fare with a pilgrimage. Once off the plane, I'm sure you could forgo the scheduled activities, rent a car, and drive south through Mayo, Galway, Clare, etc., and on to Dingle. Just a thought...