Cheap flights from Los Angeles to Illinois from $103

The cheapest month to fly to Illinois from Los Angeles is in September. Flight prices, which tend to average around $244, 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 September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $260.

The cheapest day to depart from Los Angeles to Illinois is on a Thursday when prices can be found for as low as $357. Flights from Los Angeles to Illinois on a Sunday will generally be more expensive and average around $433. 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 afternoon. Flights from Los Angeles to Illinois during this time can be as low as $276. Flights at noon are often more expensive with an average ticket price of $452.

Fly from Los Angeles to Chicago Greater Rockford for the best Los Angeles - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Los Angeles when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $312 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Los Angeles for as low as $259 on momondo.

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

Delta, Southwest, and United Airlines are the most popular carriers operating from Los Angeles to Illinois

American Airlines, United Airlines and Spirit Airlines are the top three most popular airlines that fly to Illinois from Los Angeles according to our data. American Airlines is the first choice among our users, with 46% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 9 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

As of February 2026, there are 88 flights per day flying from Los Angeles to Illinois. The most common time of day flights depart is 8:00AM, with 50% of flights taking off at noon.

621 flights are operational weekly from Los Angeles to Illinois as of February 2026. The most popular departure day for this route is Wed, with 17% of flights per week taking off on this day.