Cheap flights from Illinois to Bozeman from $174

The month of April is, on average, the cheapest month to fly to Bozeman from Illinois, with most prices found around $333. If you don’t want to visit Bozeman in April, then you should wait until January to fly from Illinois, when ticket prices are also cheap, with an average price of $352.

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 $367. 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 $413.

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 $394 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.

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

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to Bozeman from Illinois according to our data. United 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.

As of November 2026, there are 6 flights per week flying from Illinois to Bozeman. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.

On average, it takes 4h 29m to fly from Illinois to Bozeman if you fly out of Chicago (the most popular airport in Illinois) and into Bozeman (the most popular airport in Bozeman). If you’re flying out of Peoria and into Bozeman, then the flight time is around 5h 33m.