Cheap flights from Illinois to District of Columbia from $80

In general, August is the cheapest month to fly from Illinois to District of Columbia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $164. If you don’t want to visit District of Columbia in August, then you should wait until September to fly from Illinois, when ticket prices are also cheap, with an average price of $182.

The cheapest day to depart on your flight to District of Columbia is on a Friday when prices can be found for as low as $355. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $554.

Flying to District of Columbia from Illinois in the morning is the least expensive time of day to depart. momondo users have found prices as low as $346 when looking at flights departing in the morning. Flights to District of Columbia are more costly at noon, with an average ticket price of $785. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Chicago O'Hare Intl to Baltimore/Washington for the best Illinois - District of Columbia flight prices

You are more likely to see cheaper flights to District of Columbia from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to District of Columbia for around $328 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to District of Columbia from Illinois for as low as $258 on momondo.

There are 4 cabin classes available to choose from on Illinois to District of Columbia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier, Delta, and American Airlines are the most popular carriers operating from Illinois to District of Columbia

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to District of Columbia from Illinois according to our data. United Airlines is the first choice among our users, with 48% of people opting to fly with this airline when traveling to District of Columbia. Keep in mind that there are 7 different airlines that fly to District of Columbia on a routine basis, so you have a few additional options to choose from.

As of March 2026, 67 flights take off from Illinois and land in District of Columbia each day. The most common flight departure time for this route is 6:00PM, with 36% of daily flights taking off at noon.

As of March 2026, there are 469 flights per week flying from Illinois to District of Columbia. The most common day of the week flights depart is Mon, with 20% of flights taking off on this day.