When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 31 days in advance, which can save you up to 111% on flights from Illinois to Washington compared to booking the week you need them. Waiting 31 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $235. For sooner than that we have options available in the next 3 days from $341.
April can be a great time to fly to Washington from Illinois with a flight ticket averaging about $172. Cheapflights users have found deals in the month of April for as cheap as $113. The most expensive prices can be found in the month of September.
The chart below displays the airlines Cheapflights users traveling from Illinois to Washington choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
||$60||$171||No cancel fee||65%|
||$100||$223||No cancel fee||62%|
||$43||$352||No cancel fee||71%|
||$153||$383||No cancel fee||69%|
||$90||$385||No cancel fee||N/A|