Update: Some offers mentioned below are no longer available. View the current offers here.Frontier Airlines is having another sale, with flights starting at $39 one-way from many of the cities it flies from, including Atlanta, GA; Cincinnati, OH; Denver, CO; Ft. Lauderdale, FL; Phoenix, AZ and Orlando, FL for select dates from June 20, 2015 through July 25, 2015.Frontier is running a summer sale with fares starting at $39.If you are interested in scoring any of these fares for $39, be sure to book sooner than later because during the past several sales that Frontier has offered, the fares usually sell out rather quickly.Fly from Phoenix to Denver for $39 one-way this summer.Tickets must be purchased by 11:59pm Eastern time on June 11, 2015 for domestic, nonstop travel. If you are looking for a quick getaway this summer, you might want to take a look at some of these deals.While Frontier may not be a part of a major alliance and these cheap flights won’t help you get any closer to earning any major elite status, you can still bank extra credit card points by using a card that maximizes airfare purchases, like 3x on airfare with the American Express® Gold Card or 2x on the Chase Sapphire Preferred. Check out this post for more on maximizing airfare purchases.Report your success if you snag any of these!Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.[card card-name=‘Chase Sapphire Preferred® Card’ card-id=‘22125056’ type=‘javascript’ bullet-id=‘1’]