We've scanned every flight from Atlanta to Washington DC to find the best deals. If you want a cheap flight, it's best to be as flexible as you can on dates. If that day's no good for you, try searching by month to see some alternative dates.
Washington DC Ronald Reagan Washington National Airport is just one of the airports in Washington DC. If you're not set on a specific airport, try changing your search from Washington DC Ronald Reagan Washington National Airport to Washington DC to see a broader range of flights – they might be cheaper. It usually takes about 5 hrs 55 mins to fly 876 km to Washington DC Ronald Reagan Washington National Airport.
If you're planning on going to Washington DC during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.