Fly from Austin, TX (AUS) to Chicago, IL (ORD) $58 round-trip, nonstop on Frontier Airlines for travel between April 14 through May 20, 2015.
Travel on Tuesday, Wednesday, and Saturdays at this price. Bookable on FrontierAirlines.com. Purchase before March 25, 2015. Frontier charges a $25 fee each way for carry-on bags larger than 18 x 14 x 8 in.