I'm not 100% sure but I don't wanna give you a wrong answer, so I'm going to say google will be your best friend when it comes to this. Only because it depends on dates, times,and luggage, and the amenities you expect while flying. Hopefully this gives you some idea on what you'll need to look for
Type in google flights in your chrome browser. Then add your itinerary to the matrix that will come up...
Southwest Airlines and as someone else mentioned Spirit have good deals going on. You can also check priceline, Groupon, and other specialty sites geared towards finding flight deals.
Go Spirit... Affordable and not bad for short trips. Around $40
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