I live in Muncie and fly out of IND 10-15 times a year, of which 2-3 times would be to MCO. I'll give you my past experiences knowing that the future may not be the same. Three airlines fly n/s from IND to MCO and they are NWA, SWA and AirTran. I wait until both SWA and AirTran come out with fares for the dates I want to fly and then start checking NWA also. It may take a couple of days for the fares to come down, but check everyday. I have found NWA to be very competitive with SWA and AirTran and many times less expensive. If you can be flexible by a day or two on your trip, you may get a better fare. I just flew r/t from IND to MCO (Jan.28-Feb. 2) for $117 on NWA and that included all fees and taxes. I made the reservation on December 14. I don't expect this low of fare each time, but around $150 r/t out of IND to MCO is very common during the slower times. I dislike the "cattle call" with SWA, so I try to avoid them whenever possible. The couple times I flew SWA from IND to MCO, the pre-boarding was at least 1/2 of the plane and I believe the plane comes from Chicago.
Below is a link to IND. Click on "about IND" at the top and go down to "our airlines".
http://www.indianapolisairport.com/