A little pre-holiday travel might be in order with a short sale happening right now from Frontier. (It's also well-timed for anyone traveling for Hannukah.)
If you purchase by 11:59 pm on November 1, you can find $20 one-way flights and round-trip tickets for as little as $38.40 to many locations around the US. As these sales go, many of the cheapest trips are over shorter distances, but the deals are good up and down the list of routes.
The flights must be taken between November 29 and December 19.