From most locations, the cheapest flights to Washington can be found during the month of March; however great deals can be found at other times.
Most flyers found that booking flight tickets 31 days in advance of their planned departure date is, on average, the best time to get cheap flights to Washington.
In general, booking your departure to Washington for a Thursday represents the best deal on airfare. Try to avoid a Saturday departure to stay away from the highest prices.
In general, when looking for the cheapest flight to Washington, our data indicates that evening flights are the most cost-effective. afternoon flights tend to be the most expensive.