Fall travelers can rejoice with new discounts on airfare. Frontier Airlines recently announced a fall vacation sale, with one-way fares as low as $19 to popular destinations including Chicago, Philadelphia, Orlando, and more. Dallas has the highest number of deals in the sale, including flights to/from the city to Detroit, San Jose, Houston, Jacksonville, Miami, Portland, and more. Other popular markets in the sale include flights to Orlando from New Orleans, San Antonio, and Syracuse. The sale also includes discounts to several international destinations that Frontier flies to, such as one-way service between Atlanta and Cancun from $85, and Denver to Puerto Vallarta from $99. The lowest discounts at $19 are exclusively for members of Frontier's paid membership program, Discount Den. The program has an annual fee of $99 for the first year, and $59 for subsequent years, and provides access to lower cost fares as well as benefits including free flights for children. The sale ends on September 23, 2024 at 11:59 p.m., and is valid on travel for select days through November 20, 2024. There are several restricted dates in the sale, such as discounted travel to Las Vegas is only available on Sunday through Wednesday. The sale is currently available on Frontier's site. For travelers looking to book a fall vacation, Travel + Leisure spotted deals including: