Cheap flights from Illinois to Missoula from $159

The month of May is, on average, the cheapest month to fly to Missoula from Illinois, with most prices found around $362. If you are unable to visit Missoula during the month of May, then departing from Illinois during the month November is also very affordable. Most momondo users find prices during this month for around $372.

On average, the least expensive day to fly to Missoula from Illinois is on a Monday. momondo users have found tickets for Monday departures for as low as $420. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Thursday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $515.

The cheapest time of day to fly to Missoula is in the morning when flights can be purchased for as low as $449. Flights in the evening are often more expensive with an average ticket price of $540.

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

You are more likely to see cheaper flights to Missoula from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Missoula for around $465 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Missoula from Illinois for as low as $291 on momondo.

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

As of August 2026, 1 flights take off from Illinois and land in Missoula each day. The most common flight departure time for this route is 8:00AM, with 100% of daily flights taking off at noon.

The number of flights available between Illinois and Missoula is 9 per week as of August 2026. The most frequent departure day is Mon, with 22% of weekly flights leaving on this day.