If you're on a tighter budget, Allegiant Air flies from okc and Tulsa to just outside Orlando. From there you can get a rental car and do both the Atlantic side and over to St Pete area. I did that a couple weeks ago and flight plus car was under $300.
A quick drive to DFW gives you Spirit Airlines, the hands down worst domestic carrier ever but dirt cheap. I flew them for $120 to Puerto Rico last year. I've seen Myrtle Beach for under $100 lately.
A tip if you have an early flight from DFW. Use Priceline name your own price in the north Dallas airport area 4 star hotels. The only ones fitting that criteria are the Hyatt on the airport property for usually about $60. A night there site beats leaving okc at 230 to catch a flight!
Depends on your vehicle and fuel prices. From Tulsa for me it's at least 8 gallons and since I ain't parking my bike at an airport that means the wifes car at 15 gallons or my truck at 20 gallons each way, @$3.50 per gallon plus a $60 stay I come out ahead just taking the hit and paying for the commuter leg. Now if it's my wife and I then it's better to drive down and back to catch a cheap flight.