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Being one of the busiest East Coast connections between Atlanta, the largest Southeastern airline hub, and Washington, the capital of the country, the route connecting these two cities is popular among government contractors, lobbyists, consultants, military personnel, federal employees, as well as tourists going to see the Smithsonian museums and the national monuments. Delta airline has a hub in ATL; thus, this route is among the airline's frequently served flights, and DCA's proximity to the city center makes it a preferable airport over Dulles for many business passengers. The distance of about 547 miles is covered in approximately 1 hour and 50 minutes of non-stop flying time, and due to the high-frequency schedule, the cost may change quite often depending on demand.

Before booking your should get familiar with the tips to book cheap flight tickets to Washington, which help you in your journey.

The prices of this route depend greatly on the Congressional session times, federal budgetary deadlines, and the tourism period of cherry blossoms in Washington, DC, along with a constant flow of business travelers in Atlanta throughout the year.
Fares drop slightly for the first couple of weeks after Christmas because of the new Congressional session, which starts operating very soon; thus, the demand for business travelers is higher than for leisure destinations.
During this period, prices start rising continuously, reaching their peak in late March and early April due to the high inflow of leisure travelers caused by the National Cherry Blossom Festival, while the amount of business travelers stays constant.
There will be no huge spikes in prices; there will be just an increased price level for several months due to family tourism and sightseeing at the Smithsonian, the National Mall, and other monuments, partially offset by the recess of Congress in August.
It is usually the most costly period of the year on this route since Congress will come back after the recess and the federal fiscal year ends on September 30th, leading to travel activity by contractors and agencies trying to wrap up the budget year.
Prices drop significantly in the first part of the month as fiscal year travel comes to an end along with summer tourism, but prices firm up once again towards the end of the month as Thanksgiving travel starts.
Prices rise until mid-month due to holiday travel, fall briefly during the “dead” week between Christmas and New Year's, and then rise sharply again during New Year's return travel.