Cheap flights from Missoula to Illinois from $136

The cheapest month to fly to Illinois from Missoula is in January. Flight prices, which tend to average around $240, 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 June is also cheap. Prices for this month can be found on momondo for an average of $327.

The cheapest day to depart from Missoula to Illinois is on a Thursday when prices can be found for as low as $450. Flights from Missoula to Illinois on a Monday will generally be more expensive and average around $619. 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 Missoula to Illinois during this time can be as low as $471. Flights at noon are often more expensive with an average ticket price of $546.

Fly from Missoula Johnson-Bell Field to Chicago O'Hare Intl for the best Missoula Johnson-Bell Field - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Missoula when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $408 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Missoula for as low as $299 on momondo.

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

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Missoula Johnson-Bell Field to Illinois

American Airlines, United Airlines and Alaska Airlines are the top three most popular airlines that fly to Illinois from Missoula according to our data. American Airlines is the first choice among our users, with 48% 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.

The number of flights available between Missoula and Illinois is 2 per day as of March 2026. The most frequent departure time is 1:00PM, with 100% of daily flights leaving in the afternoon.

As of March 2026, 15 flights take off from Missoula and land in Illinois each week. The most common flight departure day for this route is Mon, with 20% of weekly flights taking off on this day.