Cheap flights from Illinois to Boise from $127

The month of July is, on average, the cheapest month to fly to Boise from Illinois, with most prices found around $91. If you aren’t able to travel during the month of July, then book flights to Boise from Illinois during August instead. Flights to Boise in August, while not as cheap as those in July, still average around $114.

Our data shows that Wednesday is the least expensive day to fly to Boise. Tickets to fly out on this day can be as low as $345. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $587. These prices are subject to change though, so be sure to set up a Price Alert for flights to Boise.

Our data shows that the cheapest Illinois to Boise flights are usually those with departure times at noon. Our users have found flights to Boise at noon for as low as $357. In the evening is when there is more demand to fly to Boise, so prices are often more expensive at around $560 per ticket.

Fly from Chicago O'Hare Intl to Boise Air Term. Gowen Fld for the best Illinois - Boise Air Term. Gowen Fld flight prices

You are more likely to see cheaper flights to Boise from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Boise for around $449 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boise from Illinois for as low as $320 on momondo.

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

Frontier, Alaska Airlines, and United Airlines are the most popular carriers operating from Illinois to Boise Air Term. Gowen Fld

American Airlines, United Airlines and Southwest are the top three most popular airlines that fly to Boise from Illinois according to our data. American Airlines is the first choice among our users, with 54% of people opting to fly with this airline when traveling to Boise. Keep in mind that there are 5 different airlines that fly to Boise on a routine basis, so you have a few additional options to choose from.

The number of flights available between Illinois and Boise is 6 per day as of July 2026. The most frequent departure time is 7:00PM, with 59% of daily flights leaving in the evening.

As of July 2026, 43 flights take off from Illinois and land in Boise each week. The most common flight departure day for this route is Wed, with 19% of weekly flights taking off on this day.