Cheap flights from Oklahoma City to Illinois from $104

The cheapest month to fly to Illinois from Oklahoma City is in January. Flight prices, which tend to average around $345, 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 January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $350.

The cheapest day to depart from Oklahoma City to Illinois is on a Thursday when prices can be found for as low as $538. Flights from Oklahoma City to Illinois on a Sunday will generally be more expensive and average around $797. 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 morning. Flights from Oklahoma City to Illinois during this time can be as low as $541. Flights at noon are often more expensive with an average ticket price of $935.

Fly from Oklahoma City Will Rogers World to Chicago Midway for the best Oklahoma City Will Rogers World - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Oklahoma City when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $382 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Oklahoma City for as low as $330 on momondo.

There are 4 cabin classes available to choose from on Oklahoma City 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 American Airlines are the most popular carriers operating from Oklahoma City Will Rogers World to Illinois

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to Illinois from Oklahoma City according to our data. United Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 4 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 19 flights per day flying from Oklahoma City to Illinois. The most common time of day flights depart is 11:00AM, with 63% of flights taking off at noon.

As of September 2026, there are 138 flights per week flying from Oklahoma City to Illinois. The most common day of the week flights depart is Thu, with 20% of flights taking off on this day.