Flights as low as $230 round trip from Fort Lauderdale.
Start your searches on Expedia just to get a feel for what’s available, and then go to invidual airline web sites.
For Southwest, you just have to start there since they don’t show up in the multi search engines.
When checking flights from south Florida, always check MIA, FLL, and PBI if you don’t mind driving to West Palm.
There are a couple of flights on Spirit in the $200’s round trip, with other flights/airlines ranging from 300’s to 500’s. Just depends on departure and return time flexibility, etc.
Also keep in mind to airports into Dallas...most flights are DFW, but a few, including Southwest are Love field, so check that too.