Cheap flights from Las Vegas to Illinois from $77

The cheapest month to fly to Illinois from Las Vegas is in September. Flight prices, which tend to average around $159, 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 May is also cheap. Prices for this month can be found on momondo for an average of $185.

The cheapest day to depart from Las Vegas to Illinois is on a Friday when prices can be found for as low as $285. Flights from Las Vegas to Illinois on a Monday will generally be more expensive and average around $491. 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 Las Vegas to Illinois during this time can be as low as $298. Flights at noon are often more expensive with an average ticket price of $476.

Fly from Las Vegas Harry Reid Intl to Chicago Greater Rockford for the best Las Vegas Harry Reid Intl - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Las Vegas when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $249 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Las Vegas for as low as $190 on momondo.

There are 4 cabin classes available to choose from on Las Vegas Harry Reid Intl 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 Allegiant Air are the most popular carriers operating from Las Vegas Harry Reid Intl to Illinois

American Airlines, United Airlines and Southwest are the top three most popular airlines that fly to Illinois from Las Vegas according to our data. American Airlines is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 8 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

As of March 2026, there are 49 flights per day flying from Las Vegas to Illinois. The most common time of day flights depart is 10:00AM, with 43% of flights taking off in the afternoon.

As of March 2026, there are 343 flights per week flying from Las Vegas to Illinois. The most common day of the week flights depart is Fri, with 18% of flights taking off on this day.