Cheap flights from Illinois to Washington, D.C. from $89

If you’re not able to fly to Baltimore in February, then October is your next best option. Flight prices from Illinois to Baltimore during October average around $242.

The cheapest day to depart from Illinois to Baltimore is on a Thursday. Travelers who choose to depart for Baltimore on a Thursday will often find tickets for as low as $259. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $341. These prices are subject to change though, so be sure to set up a Price Alert for flights to Baltimore.

Flying to Baltimore from Illinois at noon is the least expensive time of day to depart. momondo users have found prices as low as $280 when looking at flights departing at noon. Flights in the evening are often more expensive with an average ticket price of $320.

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

You are more likely to see cheaper flights to Baltimore from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Baltimore for around $276 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Baltimore from Illinois for as low as $115 on momondo.

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

Southwest, United Airlines, and Delta are the most popular carriers operating from Illinois to Baltimore/Washington

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to Baltimore from Illinois according to our data. United Airlines is the first choice among our users, with 59% of people opting to fly with this airline when traveling to Baltimore. Keep in mind that there are 6 different airlines that fly to Baltimore on a routine basis, so you have a few additional options to choose from.

The number of flights available between Illinois and Baltimore is 17 per day as of September 2026. The most frequent departure time is 2:00PM, with 43% of daily flights leaving at noon.

As of September 2026, 121 flights take off from Illinois and land in Baltimore each week. The most common flight departure day for this route is Mon, with 34% of weekly flights taking off on this day.