Southwest Airlines is running specials on certain destinations if you book before 3/29/18. Its valid from April to July and August to October 2018. The fares look to be decent but not the best sale Southwest has had in the past. Its worth a look if you are looking to book airfare to one of the cities included. https://www.southwest.com/html/promotions/click_n_save_sale_180320_offers.html?clk=1325000  

On this page I will alert you all of any good airline deals that I recommend you give it a shot. Watching for discount airfare is part of how Donna and I are able to travel as much as we do.