Cheap flights from Idaho to Chicago from $137

The month of February is, on average, the cheapest month to fly to Chicago from Idaho, with most prices found around $340. If you’re not able to fly to Chicago in February, then January is your next best option. Flight prices from Idaho to Chicago during January average around $402.

The cheapest day to depart on your flight to Chicago is on a Wednesday when prices can be found for as low as $517. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Idaho to Chicago for around $748.

Our most recent data shows that the best time of day to fly to Chicago is in the afternoon. Flights from Idaho to Chicago during this time can be as low as $435. In contrast, the most expensive time of day to depart to Chicago is in the morning when prices are around $627.

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

You are more likely to see cheaper flights to Chicago from Idaho when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $428 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from Idaho for as low as $313 on momondo.

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

Alaska Airlines, Frontier, and Southwest are the most popular carriers operating from Idaho to Chicago

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to Chicago from Idaho according to our data. United Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Chicago. Keep in mind that there are 5 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.

As of October 2026, 4 flights take off from Idaho and land in Chicago each day. The most common flight departure time for this route is 3:00PM, with 83% of daily flights taking off in the afternoon.

As of October 2026, there are 29 flights per week flying from Idaho to Chicago. The most common day of the week flights depart is Thu, with 34% of flights taking off on this day.