Another great opportunity to fly out of Denver International Airport ends Monday (Jan 19) at 11:59 p.m., so take advantage while you can. Southwest airlines is notorious for having spur of the moment sales. They don't always have a great selection, however this one is defiantly one to check out. Prices for this sale of one-way tickets range from $73 to $191. You can fly to and from a huge selection of destination ranging from Detroit, Pittsburgh, Nashville, New York and Boston just to name a few.