There are a couple of American Airlines low fares from Dallas DFW to Orlando MCO or Phoenix PHX at $86.20 round trip for travel on many Tue, Wed, Sat dates from September to December. Phoenix has best availability in October and Orlando has best availability in November and early December.
Frontier has some very low $48 round trip fares for DFW-MCO on Tuesdays, so that can be a better deal if you want to stay for 7 days and must pay for checked bags with American.
American Airlines Dallas DFW – Orlando MCO nonstop
American Airlines Dallas DFW – Phoenix PHX nonstop