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The capital of the United States, Washington, D.C. is an interesting blend of history and modern sophistication. Brimming with historical attractions, exceptional museums, restaurants and offering a vibrant nightlife, Washington, D.C. has lots to see, do and experience. Take off to Washington D.C. booking flights on OneTravel. We offer discounts on top airlines, including AirTran, Delta and Frontier Airlines. The average travel time to reach Washington, D.C. from Denver, CO is three hours and twenty minutes.