United Airlines has sale fares from Washington Dulles to several domestic destinations, including Atlanta and Phoenix. For example, nonstop flights to Denver start at $156 round trip for basic economy and from $196 for economy. Other airlines are matching, but fares typically start at $217 and $257, respectively. Basic fare allows only one personal item onboard and seats are automatically assigned. Travel Aug. 22-Dec. 16, except Fridays and Sundays and select blackout dates. Book by July 27 at www.united.com.