Cheap flights from Bozeman to Illinois from $160

The cheapest month to fly to Illinois from Bozeman is in February. Flight prices, which tend to average around $287, 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 February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $293.

The cheapest day to depart from Bozeman to Illinois is on a Thursday when prices can be found for as low as $446. Flights from Bozeman to Illinois on a Sunday will generally be more expensive and average around $653. 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 at noon. Flights from Bozeman to Illinois during this time can be as low as $438. Flights in the morning are often more expensive with an average ticket price of $494.

Fly from Bozeman Gallatin Field to Chicago O'Hare Intl for the best Bozeman Gallatin Field - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Bozeman when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $384 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Bozeman for as low as $292 on momondo.

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

United Airlines, Southwest, and Delta are the most popular carriers operating from Bozeman Gallatin Field to Illinois

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to Illinois from Bozeman according to our data. United Airlines is the first choice among our users, with 70% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 3 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

3 flights are operational daily from Bozeman to Illinois as of November 2026. The most popular departure time for this route is 1:00PM, with 100% of flights per day taking off in the afternoon.

The number of flights available between Bozeman and Illinois is 21 per week as of November 2026. The most frequent departure day is Wed, with 19% of weekly flights leaving on this day.