What is the big deal about the prices listed:

Dtw to Florida is the longest distance and the highest price

Cmh  is 120 miles south of cleveland and slightly cheaper

Cle is the mid point and has the mid point fares

( why drive to Columbus  4 hours and a tank of gas to same $30)

if Cmh is so great why do they have so few flights across the USA)

they key to cheap airfares is not having to go at a certain time.    I know that's not always possible, but its what does the trick.     For my vacation flights, I sit and watch and watch and watch and watch and finally BITE!    I'm signed up for several website fare alerts  (Travelocity is one) and keep my vacations flexible.   In all my years of flying, the most I've ever paid is around $250, and I always head west....a lot farther than FL.   I've even gotten an airfare to LA as low as $108 r/t within the last few years.

If you HAVE to travel for the holidays you're basically screwed price-wise.   There's always the 21-day window rule of thumb that says fares will go up once you get inside that window from the time you want to travel, but other than that being flexible is the way to beat the system....and I've become quite good at it.