If you're planning one big vacation for the year, you're doing pretty well. Maybe you took advantage of $99 flights to Europe or $99 flights to Iceland in the spring, and you're set for the year. Frontier Airlines, which often has deals worth considering, has a sale going on hat might make it possible for you to cram in a little extra time away.
The airline is offering one-way tickets for as little as $27. The cheapest routes are often over short distances or within the same region of the country, but there are deals all over the US.
The airline has 54 routes with tickets at $29 and more than a hundred under $40. However, most of the deals are for flights that must be taken by March 7 and must be purchased by midnight on January 28. (Though, Frontier is a budget airline, so even if you're checking after midnight, it's worth taking a look. Prices are probably still going to be low.)