They don't fly to/from everywhere, but Frontier Airlines has some crazy cheap flights. On select days, you can fly between Houston and Orlando for $29 each way. Of course, you have to pay extra for luggage, but if you pack lightly, it's not a bad deal at all. I would even consider taking the kids for a 2-3 day trip with prices like that. I flew from Houston to Phoenix with my daughter for a few days to visit my Mom, For $80 total for both of us, we flew round trip. We packed lightly and were able to fit all of our stuff inside a medium sized backpack for each of us. It's a no-frills airline, you have to pay for everything, but if you know the ropes, it's dirt cheap.