I take advantage of airlines quick sales often to plan inexpensive trips with the family, and one airline has a sale that is going on until the end of the day, Wednesday (July 8). So act now and you can get airfare for as low as $39 out of Denver International Airport. Frontier airlines has a sale going on right now for one-way tickets that can be used at different times, however the most common dates are between November 19, 2015 and December 1, 2015. You can fly to Salt Lake City for as little as $39, however the majority of the flights are $49 (still not bad), to destinations like Phoenix, Las Vegas, Chicago and Dallas. You can also get to Los Angeles and Houston for $69, and Orlando for $99, just to name a few more.