Cheap flights from Illinois to Bozeman from $160

The month of January is, on average, the cheapest month to fly to Bozeman from Illinois, with most prices found around $316. If you don’t want to visit Bozeman in January, then you should wait until April to fly from Illinois, when ticket prices are also cheap, with an average price of $331.

Our data shows that Tuesday is the least expensive day to fly to Bozeman. Tickets to fly out on this day can be as low as $364. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to Bozeman for around $401.

Our most recent data shows that the best time of day to fly to Bozeman is at noon. Flights from Illinois to Bozeman during this time can be as low as $362. In contrast, the most expensive time of day to depart to Bozeman is in the afternoon when prices are around $412.

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

You are more likely to see cheaper flights to Bozeman from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Bozeman for around $381 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Bozeman from Illinois for as low as $317 on momondo.

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

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

American Airlines, United Airlines and Southwest are the top three most popular airlines that fly to Bozeman from Illinois according to our data. American Airlines is the first choice among our users, with 47% of people opting to fly with this airline when traveling to Bozeman. Keep in mind that there are 5 different airlines that fly to Bozeman on a routine basis, so you have a few additional options to choose from.

The number of flights available between Illinois and Bozeman is 4 per day as of September 2026. The most frequent departure time is 10:00AM, with 70% of daily flights leaving at noon.

As of September 2026, there are 33 flights per week flying from Illinois to Bozeman. The most common day of the week flights depart is Sun, with 18% of flights taking off on this day.