There's an endless list of reasons you should take a vacation: The endless cheer of the holidays can be suffocating, the everyday grind can drain you, or maybe you just need an opportunity to learn about and experience something new. However, the best reason of all might just be that there's a sale going on and you've gritted your teeth through 2017 just like everyone else.
Southwest is having its last sale of the year with one-way fares as low as $40. (The sale lasts through December 28, so "last" isn't saying a whole lot. Though, as with any flight sale, availability will likely thin the longer you wait.)
The flights are for domestic trips between January 2 and May 23. Additionally, international flights are available with travel dates between January 9 and March 1 and then again between April 3 and May 18.