I flew out of Midway recently, and booked a New Years flight from Midway - both non-stop on Air Tran. They offer what seems to be a daily non-stop.
Very reasonable under $500 if your dates are flexible. Bare bones - $25 to check a bag. But, $20 per seat for exit row and reasonable upgrades available at the airport for business class. Then the bag is free. And drinks are free. No meals, though. But they bring enough snacks that you don't go hungry.