Cheap flights from Raleigh to Illinois from $54

The cheapest month to fly to Illinois from Raleigh is in December. Flight prices, which tend to average around $247, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of December, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $265.

The cheapest day to depart from Raleigh to Illinois is on a Thursday when prices can be found for as low as $385. Flights from Raleigh to Illinois on a Monday will generally be more expensive and average around $557. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Raleigh to Illinois during this time can be as low as $352. Flights at noon are often more expensive with an average ticket price of $457.

Fly from Raleigh-Durham to Chicago Midway for the best Raleigh-Durham - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Raleigh when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $315 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Raleigh for as low as $260 on momondo.

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

Frontier, Southwest, and Delta are the most popular carriers operating from Raleigh-Durham to Illinois

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Illinois from Raleigh according to our data. American Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 6 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

As of September 2026, there are 34 flights per day flying from Raleigh to Illinois. The most common time of day flights depart is 9:00AM, with 51% of flights taking off at noon.

The number of flights available between Raleigh and Illinois is 244 per week as of September 2026. The most frequent departure day is Sun, with 17% of weekly flights leaving on this day.