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Frontier Airlines is offering flights as low as $29 one way from Washington, DC. This is a one day sale so you must book by 11:59pm ET on Friday November 21, 2014 for travel December 3, 2014 through February 12, 2015. This includes flights from Washington, DC (Dulles) to the following 15 cities: Atlanta, Chicago, Charlotte, Cincinnati, Detroit, Ft. Lauderdale, Ft. Meyers, Las Vegas, Memphis, Minneapolis, St. Louis, Orlando, St. Augustine, Tampa, and West Palm Beach.
Unfortunately though this is for travel on Tuesdays, Wednesdays, and Saturdays only (and blackout dates apply: December 20, 22, 24, 27, 30, 31, and January 3). Flight availability for these discounted flights are sparse, but if your travel dates are flexible this could be a great dare sale for you.