There's no shortage of budget airlines offering ultra-cheap flights if you can take a trip on their timeline. Nonetheless, landing a round-trip flight for $38.40 is pretty remarkable.
That's the deal Frontier is offering right now. The airline's sale has $20 one-way flights, which can result in a round-trip ticket for $38.40 on lots of routes. (You don't need to be a member of the Frontier Discount Den for this price.) In the sale, you'll find 22 routes with one-way flights for $20 and more than 175 routes with one-way flights for less than $40.
To get in on the sale, buy before midnight on October 15 for flights taken between November 29 and December 15. Locations in the sale include Atlanta, Austin, Chicago, Denver, Detroit, Las Vegas, Kansas City, Milwaukee, Minneapolis, New Orleans, Orlando, Philadelphia, Phoenix, Pittsburgh, San Antonio, Tampa, West Palm Beach, and many other cities.