If you want a cheap flight from Fort Lauderdale to Dallas, you've got one airlines to choose from.
Dallas/Fort Worth International Airport is just one of the airports in Dallas. If you're not set on a specific airport, try changing your search from Dallas/Fort Worth International Airport to Dallas to see a broader range of flights – they might be cheaper. It usually takes about 11 hrs 35 mins to fly 1800 km to Dallas/Fort Worth International Airport.
If you're planning on going to Dallas during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.