Get in on the sale by browsing this sale page. However, take the time to note the fine print. You have to book by November 30, and the travel dates are limited. For domestic flights, you must travel between December 19 and May 23, 2018. Though, there are blackout dates on December 22-23, December 26-27, and December 30.
If you're flexible and simply looking for the best deal, try Southwest's Low Fare Calendar. It shows prices laid out in a month-long view like you see above.
The deals are worth taking note of because, unlike budget airlines, Southwest includes free checked bags. It's also way better than trying to skydive into a plane headed in your direction.
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