While fares to the UK and most of Europe remain pricey for fall, it's nice to catch a little bit of a break with fares to Ireland. We found seats from Orlando to Dublin for $549 round-trip, including all taxes, on American, for travel in early November.
And of course, from Dublin or Shannon, you can very easily book a cheap flight to nearly anywhere in Europe on Ryanair or any other budget carrier.
Similar fares available from Boston, New York, and Chicago. You'll find a complete listing of fares to Dublin here.