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Cheap flights from Idaho to Illinois from $105

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Idaho to Illinois departing on 4/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Idaho to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
2:25 pm - 11:20 pm
GEG
-
MDW
6h 55m
1 stop
Southwest Logo
5:35 pm - 10:55 pm
MDW
-
GEG
7h 20m
1 stop
$221Southwest
Wed, May 6 - Tue, May 12
Southwest Logo
2:25 pm - 11:55 pm
GEG
-
ORD
7h 30m
1 stop
Southwest Logo
4:50 pm - 11:25 pm
ORD
-
GEG
8h 35m
1 stop
$221Southwest
Wed, May 6 - Tue, May 12
American Airlines Logo
1:22 pm - 7:19 pm
GEG
-
ORD
3h 57mnonstop
American Airlines Logo
10:30 am - 12:32 pm
ORD
-
GEG
4h 02mnonstop
$251American Airlines
Tue, Apr 14 - Wed, Apr 22
Delta Logo
11:35 pm - 9:56 am
BOI
-
MDW
9h 21m
1 stop
Delta Logo
9:29 am - 2:26 pm
MDW
-
BOI
5h 57m
1 stop
$271Delta
Wed, Apr 22 - Wed, Apr 29
Delta Logo
1:52 pm - 11:58 pm
BOI
-
ORD
9h 06m
1 stop
Delta Logo
12:46 pm - 8:00 pm
ORD
-
BOI
8h 14m
1 stop
$271Delta
Wed, Apr 22 - Wed, Apr 29
Alaska Airlines Logo
7:19 am - 6:40 pm
GEG
-
ORD
9h 21m
1 stop
Alaska Airlines Logo
8:50 am - 10:20 pm
ORD
-
GEG
15h 30m
1 stop
$277Alaska Airlines
Tue, Apr 14 - Wed, Apr 22
American Airlines Logo
1:29 pm - 6:16 pm
BOI
-
ORD
3h 47mnonstop
American Airlines Logo
9:54 am - 12:49 pm
ORD
-
BOI
3h 55mnonstop
$283American Airlines
Wed, Apr 22 - Wed, Apr 29
Alaska Airlines Logo
2:45 pm - 11:59 pm
GEG
-
ORD
7h 14m
1 stop
Alaska Airlines Logo
6:00 am - 10:38 am
ORD
-
GEG
6h 38m
1 stop
$286Alaska Airlines
Sat, May 2 - Wed, May 6
United Airlines Logo
4:23 pm - 12:44 am
JAC
-
ORD
7h 21m
1 stop
United Airlines Logo
4:21 pm - 6:42 pm
ORD
-
JAC
3h 21mnonstop
$329United Airlines
Wed, Jul 22 - Tue, Jul 28
United Airlines Logo
5:26 pm - 11:57 pm
IDA
-
ORD
5h 31m
1 stop
United Airlines Logo
5:00 am - 9:50 am
ORD
-
IDA
5h 50m
1 stop
$329United Airlines
Wed, May 20 - Fri, May 29

Alaska Airlines flights from Idaho to Illinois

Our best Alaska Airlines deals on Idaho to Illinois flight tickets
Alaska Airlines
Apr 14
GEG7:19 amSpokane
9h 21m
1 stop
ORD6:40 pmChicago O'Hare Intl
Apr 22
ORD8:50 amChicago O'Hare Intl
15h 30m
1 stop
GEG10:20 pmSpokane
$277
Alaska Airlines
May 2
GEG2:45 pmSpokane
7h 14m
1 stop
ORD11:59 pmChicago O'Hare Intl
May 6
ORD6:00 amChicago O'Hare Intl
6h 38m
1 stop
GEG10:38 amSpokane
$286
Alaska Airlines
Apr 25
BOI4:38 pmBoise Air Term. Gowen Fld
13h 02m
1 stop
ORD6:40 amChicago O'Hare Intl
May 2
ORD6:00 amChicago O'Hare Intl
8h 52m
1 stop
BOI1:52 pmBoise Air Term. Gowen Fld
$295

Southwest flights from Idaho to Illinois

Our best Southwest deals on Idaho to Illinois flight tickets
Southwest
May 6
GEG2:25 pmSpokane
7h 30m
1 stop
ORD11:55 pmChicago O'Hare Intl
May 12
ORD4:50 pmChicago O'Hare Intl
8h 35m
1 stop
GEG11:25 pmSpokane
$221
Southwest
May 6
GEG2:25 pmSpokane
7h 30m
1 stop
ORD11:55 pmChicago O'Hare Intl
May 12
ORD10:30 amChicago O'Hare Intl
14h 25m
2 stops
GEG10:55 pmSpokane
$232
Southwest
Apr 25
BOI11:00 amBoise Air Term. Gowen Fld
10h 20m
2 stops
ORD10:20 pmChicago O'Hare Intl
May 2
ORD7:00 amChicago O'Hare Intl
10h 15m
2 stops
BOI4:15 pmBoise Air Term. Gowen Fld
$274

momondo Fare Finder

 
Customize your flight search to find flights from Idaho to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 24, 2026.
Use the filters below to find and compare flights from Idaho to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Wed 5/6

2:25 pm-11:20 pm

1 stop6h 55m

Chicago Midway

Tue 5/12

5:35 pm-10:55 pm

1 stop7h 20m

$221

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 5/6

2:25 pm-11:55 pm

1 stop7h 30m

Chicago O'Hare Intl

Tue 5/12

4:50 pm-11:25 pm

1 stop8h 35m

$221

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 4/14

1:22 pm-7:19 pm

Nonstop3h 57m

Chicago O'Hare Intl

Wed 4/22

10:30 am-12:32 pm

Nonstop4h 02m

$251

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Wed 4/22

11:35 pm-9:56 am

1 stop9h 21m

Chicago Midway

Wed 4/29

9:29 am-2:26 pm

1 stop5h 57m

$271

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Wed 4/22

1:52 pm-11:58 pm

1 stop9h 06m

Chicago O'Hare Intl

Wed 4/29

12:46 pm-8:00 pm

1 stop8h 14m

$271

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 4/14

7:19 am-6:40 pm

1 stop9h 21m

Chicago O'Hare Intl

Wed 4/22

8:50 am-10:20 pm

1 stop15h 30m

$277
Quickest round-trip

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Wed 4/22

1:29 pm-6:16 pm

Nonstop3h 47m

Chicago O'Hare Intl

Wed 4/29

9:54 am-12:49 pm

Nonstop3h 55m

$283

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Sat 5/2

2:45 pm-11:59 pm

1 stop7h 14m

Chicago O'Hare Intl

Wed 5/6

6:00 am-10:38 am

1 stop6h 38m

$286

JacksonChicago

JAC - ORD

JACORD

Jackson Hole

Wed 7/22

4:23 pm-12:44 am

1 stop7h 21m

Chicago O'Hare Intl

Tue 7/28

4:21 pm-6:42 pm

Nonstop3h 21m

$329

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Wed 5/20

5:26 pm-11:57 pm

1 stop5h 31m

Chicago O'Hare Intl

Fri 5/29

5:00 am-9:50 am

1 stop5h 50m

$329

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

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

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Idaho is in September. Flight prices, which tend to average around $315, 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 September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $336.

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 $466. Flights from Idaho to Illinois on a Sunday will generally be more expensive and average around $708. 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 in the afternoon. Flights from Idaho to Illinois during this time can be as low as $403. Flights in the morning are often more expensive with an average ticket price of $633.

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 $382 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 $237 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 14% 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

$196

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 $196. The best round-trip flight deal from Idaho to Illinois found on momondo in the last 72 hours is $388.
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?

  • 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?

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
DeltaPriceFrom $87Free CancellationRating
7.9
8,320 reviews
Search Delta flights
United AirlinesPriceFrom $215Free CancellationRating
7.4
9,469 reviews
Search United Airlines flights
SouthwestPriceFrom $233Free CancellationRating
8.0
4,329 reviews
Search Southwest flights
American AirlinesPriceFrom $255Free CancellationRating
7.1
11,492 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $260Free CancellationRating
7.9
12,102 reviews
Search Alaska 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.

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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