What is the cheapest airline that flies from Idaho to Illinois?

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

How many flights depart from Idaho to Illinois on average per day?

The number of flights available between Idaho and Illinois is 10 per day as of December 2025. The most frequent departure time is 12:00PM, with 60% of daily flights leaving in the afternoon.

How many flights depart from Idaho to Illinois on average per week?

75 flights are operational weekly from Idaho to Illinois as of December 2025. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.

How long is the flight from Idaho to Illinois?

The flight from Idaho to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Idaho Falls (a popular airport in Idaho) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h 16m on average. If you fly from Boise (another popular airport in Idaho) to Chicago O'Hare Intl Airport, then the average flight time is 3h 24m.

What airlines fly to Illinois?

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to Illinois from Idaho according to our data. United Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Idaho to Illinois?

Prices for flights from Idaho to Illinois refresh daily.

How many operators does momondo search for flights from Idaho to Illinois?

The number of operators available for flights from Idaho to Illinois is 5 as of December 2025.

How old do you have to be to fly from Idaho to Illinois?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Idaho to Illinois.

What documentation or ID do you need to fly to Illinois?

The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$88 Cheap Flights from Idaho to Illinois in 2025/26

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Find the cheapest flights from Idaho to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:10 am - 5:03 pm

BOI

ORD

29h 53m1 stop

8:10 am - 11:43 am

ORD

BOI

28h 33m2 stops

$199Multiple Airlines

Mon, Feb 9 - Wed, Feb 18

12:28 pm - 11:14 pm

BOI

ORD

9h 46m1 stop

8:10 am - 11:43 am

ORD

BOI

28h 33m2 stops

$203Frontier

Thu, Feb 12 - Wed, Feb 18

12:30 pm - 4:45 pm

JAC

ORD

3h 15mnonstop

9:00 am - 11:22 am

ORD

JAC

3h 22mnonstop

$237United Airlines

Thu, Jan 29 - Tue, Feb 3

4:29 pm - 11:59 pm

JAC

ORD

6h 30m1 stop

9:00 am - 11:22 am

ORD

JAC

3h 22mnonstop

$247United Airlines

Mon, Jan 12 - Wed, Jan 14

2:03 pm - 7:50 pm

GEG

ORD

3h 47mnonstop

9:45 am - 11:35 am

ORD

GEG

3h 50mnonstop

$252American Airlines

Fri, May 8 - Tue, May 12

9:20 am - 9:35 pm

GEG

STL

10h 15m2 stops

6:35 am - 6:40 pm

STL

GEG

14h 05m2 stops

$256Delta

Sat, Jan 17 - Sun, Jan 18

3:40 pm - 11:53 pm

GEG

ORD

6h 13m1 stop

7:15 am - 6:55 pm

ORD

GEG

13h 40m2 stops

$260Delta

Tue, Feb 10 - Sat, Feb 14

2:45 pm - 10:25 pm

GEG

MDW

5h 40m1 stop

2:35 pm - 8:25 pm

MDW

GEG

7h 50m1 stop

$272Southwest

Sun, Jan 11 - Sat, Jan 17

2:10 pm - 10:50 pm

GEG

MDW

6h 40m1 stop

5:05 am - 11:15 am

MDW

GEG

8h 10m1 stop

$283Southwest

Tue, Jan 6 - Thu, Jan 8

2:06 pm - 8:44 am

JAC

ORD

17h 38m2 stops

9:02 am - 5:01 pm

ORD

JAC

8h 59m1 stop

$327American Airlines

Wed, Jan 28 - Mon, Feb 2

Frontier flights from Idaho to Illinois

Our best Frontier deals on Idaho to Illinois flight tickets

Frontier

Feb 12

BOI12:28 pmBoise Air Term. Gowen Fld

9h 46m

1 stop

ORD11:14 pmChicago O'Hare Intl

Feb 18

ORD8:10 amChicago O'Hare Intl

28h 33m

2 stops

BOI11:43 amBoise Air Term. Gowen Fld

$203

Find similar

Frontier

Dec 21

BOI12:38 pmBoise Air Term. Gowen Fld

10h 34m

1 stop

ORD12:12 amChicago O'Hare Intl

Jan 1

ORD7:00 amChicago O'Hare Intl

5h 43m

1 stop

BOI11:43 amBoise Air Term. Gowen Fld

$232

Find similar

Frontier

Feb 9

BOI12:07 pmBoise Air Term. Gowen Fld

27h 56m

2 stops

ORD5:03 pmChicago O'Hare Intl

Feb 12

ORD4:16 pmChicago O'Hare Intl

19h 47m

1 stop

BOI11:03 amBoise Air Term. Gowen Fld

$247

Find similar

Alaska Airlines flights from Idaho to Illinois

Our best Alaska Airlines deals on Idaho to Illinois flight tickets

Alaska Airlines

Mar 3

GEG5:00 amSpokane

6h 11m

1 stop

ORD1:11 pmChicago O'Hare Intl

Mar 7

ORD5:29 pmChicago O'Hare Intl

8h 30m

1 stop

GEG11:59 pmSpokane

$214

Find similar

Alaska Airlines

Feb 15

BOI6:28 amBoise Air Term. Gowen Fld

6h 37m

1 stop

ORD2:05 pmChicago O'Hare Intl

Feb 17

ORD3:54 pmChicago O'Hare Intl

7h 46m

1 stop

BOI10:40 pmBoise Air Term. Gowen Fld

$228

Find similar

Alaska Airlines

Jan 15

GEG7:30 amSpokane

7h 40m

1 stop

ORD5:10 pmChicago O'Hare Intl

Jan 18

ORD6:06 pmChicago O'Hare Intl

6h 58m

1 stop

GEG11:04 pmSpokane

$231

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Mon 2/9

10:10 am-5:03 pm

1 stop29h 53m

Chicago O'Hare Intl

Wed 2/18

8:10 am-11:43 am

2 stops28h 33m

$199

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 2/12

12:28 pm-11:14 pm

1 stop9h 46m

Chicago O'Hare Intl

Wed 2/18

8:10 am-11:43 am

2 stops28h 33m

$203

JacksonChicago

JAC - ORD

JACORD

Jackson Hole

Thu 1/29

12:30 pm-4:45 pm

Nonstop3h 15m

Chicago O'Hare Intl

Tue 2/3

9:00 am-11:22 am

Nonstop3h 22m

$237

JacksonChicago

JAC - ORD

JACORD

Jackson Hole

Mon 1/12

4:29 pm-11:59 pm

1 stop6h 30m

Chicago O'Hare Intl

Wed 1/14

9:00 am-11:22 am

Nonstop3h 22m

$247

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Fri 5/8

2:03 pm-7:50 pm

Nonstop3h 47m

Chicago O'Hare Intl

Tue 5/12

9:45 am-11:35 am

Nonstop3h 50m

$252

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Sat 1/17

9:20 am-9:35 pm

2 stops10h 15m

Lambert-St Louis

Sun 1/18

6:35 am-6:40 pm

2 stops14h 05m

$256

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 2/10

3:40 pm-11:53 pm

1 stop6h 13m

Chicago O'Hare Intl

Sat 2/14

7:15 am-6:55 pm

2 stops13h 40m

$260

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Sun 1/11

2:45 pm-10:25 pm

1 stop5h 40m

Chicago Midway

Sat 1/17

2:35 pm-8:25 pm

1 stop7h 50m

$272

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Tue 1/6

2:10 pm-10:50 pm

1 stop6h 40m

Chicago Midway

Thu 1/8

5:05 am-11:15 am

1 stop8h 10m

$283

JacksonChicago

JAC - ORD

JACORD

Jackson Hole

Wed 1/28

2:06 pm-8:44 am

2 stops17h 38m

Chicago O'Hare Intl

Mon 2/2

9:02 am-5:01 pm

1 stop8h 59m

$327

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Idaho to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Idaho is in February. Flight prices, which tend to average around $323, 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 September is also cheap. Prices for this month can be found on momondo for an average of $324.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Idaho to Illinois is on a Thursday when prices can be found for as low as $469. Flights from Idaho to Illinois on a Sunday will generally be more expensive and average around $780. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is at noon. Flights from Idaho to Illinois during this time can be as low as $434. Flights in the morning are often more expensive with an average ticket price of $675.

What is the cheapest Idaho to Illinois flight route?

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

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from Idaho when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $377 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Idaho for as low as $267 on momondo.

What cabin class options are available on Idaho to Illinois flights?

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

Can stopping save me money on Idaho to Illinois flights?

You could potentially save up to 33% on your flight if you consider stops on a Idaho to Illinois flight.

Cheap Idaho to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Idaho to Illinois

Best Price Found	$259
Fastest flight time	2h 57m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Idaho in the past 72 hours is $259. The best round-trip flight deal from Idaho to Illinois found on momondo in the last 72 hours is $412.

The fastest flight from Idaho to Illinois takes 2h 57m

Direct flights go from Idaho to Illinois every day.

There are 98 airports in Illinois. From Idaho there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW).

Search flight deals

When did momondo last update prices for flights from Idaho to Illinois?
Prices for flights from Idaho to Illinois refresh daily.
How many operators does momondo search for flights from Idaho to Illinois?
The number of operators available for flights from Idaho to Illinois is 5 as of December 2025.
How old do you have to be to fly from Idaho to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Idaho to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Idaho to Illinois?
Based on momondo bookings for flights between Idaho and Illinois, the leading plane model is Embraer 175 (Enhanced Winglets), making up 24.91% of the total bookings. Other popular models include Embraer 175 with 18.25%, Airbus A320-100/200 with 17.89%, and Airbus A319 with 16.49%.

Best airlines flying from Idaho to Illinois

Compare and see reviews for airlines that fly from Idaho to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $134	Free Cancellation	Rating 7.9 8,007 reviews	Search Delta flights
Alaska Airlines	PriceFrom $224	Free Cancellation	Rating 8.0 11,451 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $228	Free Cancellation	Rating 7.4 9,092 reviews	Search United Airlines flights
Southwest	PriceFrom $233	Free Cancellation	Rating 7.9 4,250 reviews	Search Southwest flights
American Airlines	PriceFrom $255	Free Cancellation	Rating 7.2 11,052 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Idaho to Illinois?

Finding the right flight to Illinois from Idaho is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Illinois quick and easy, saving you time and money.

Can I find flights from Idaho to Illinois with flexible booking policies on momondo?

momondo does allow users to show only those flights to Illinois from Idaho which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Idaho to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Idaho.

I’m not ready to book a flight from Idaho to Illinois right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Illinois, momondo offers a useful price alert feature which will track prices for flights to Illinois from Idaho and alert you when they change.