I think you're in the Chicago area, here are some discount airlines I know about..
https://www.allegiantair.com/interactive-routemap
and Frontier has $49 one way flights from Chicago to Orlando
Now these are discount airlines, it's never a pleasant flying experience. Southwest IMO isn't discount compared (southwest usually is same price or even cheaper unless its a sale) but SW seats, amenities, CS, on time flights blow away both frontier and Alliegiant. But sometimes its about dollars...
These cheap-o's nickle and time you with seat selection, baggage, no wifi or free sodas on board... smaller seats, definitely uncomfortable and cramped for taller/bigger people.