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Idaho

$96+ Cheap flights from Illinois to Idaho

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
feb. 20 — feb. 271
vie. 2/20
vie. 2/27
1 adult, Economy
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Cheap flight deals from Illinois to Idaho

Cheapest flights from Illinois to Idaho
Explore the most affordable flight options available from Illinois to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 21, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/186:02 pm
ORD
-
GEG
2 stops19h 25m
Frontier
jue. 2/2612:22 pm
GEG
-
ORD
1 stop23h 03m
Frontier
Deal found 1/19$212
This Kiwi.com deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/411:51 am
ORD
-
GEG
2 stops25h 36m
Multiple Airlines
dom. 3/89:12 pm
GEG
-
ORD
1 stop30h 56m
Multiple Airlines
Deal found 1/19$213
This Kiwi.com deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/13:29 pm
ORD
-
BOI
1 stop20h 39m
Multiple Airlines
lun. 4/65:54 pm
BOI
-
ORD
2 stops28h 56m
Multiple Airlines
Deal found 1/19$226
This United Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/168:42 am
ORD
-
SUN
Nonstop4h 11m
United Airlines
jue. 3/1912:34 pm
SUN
-
ORD
Nonstop3h 31m
United Airlines
Deal found 1/19$226
This Alaska Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/53:54 pm
ORD
-
BOI
1 stop7h 46m
Alaska Airlines
lun. 3/91:00 pm
BOI
-
ORD
1 stop9h 56m
Alaska Airlines
Deal found 1/20$229
This Expedia deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 2/98:00 am
ORD
-
BOI
1 stop8h 10m
Multiple Airlines
jue. 2/1212:36 pm
BOI
-
ORD
1 stop9h 38m
Multiple Airlines
Deal found 1/19$230
This United Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 3/158:42 am
ORD
-
SUN
Nonstop4h 11m
United Airlines
mar. 3/172:33 pm
SUN
-
ORD
1 stop8h 19m
United Airlines
Deal found 1/19$236
This Delta deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/156:45 pm
STL
-
BOI
1 stop6h 12m
Delta
mié. 4/2211:36 pm
BOI
-
STL
1 stop7h 54m
Delta
Deal found 1/19$237
This Alaska Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/43:07 pm
ORD
-
GEG
1 stop10h 52m
Alaska Airlines
mar. 3/178:29 pm
GEG
-
ORD
1 stop8h 10m
Alaska Airlines
Deal found 1/20$237
This Kiwi.com deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/13:29 pm
ORD
-
BOI
1 stop20h 39m
Frontier
dom. 4/512:03 pm
BOI
-
ORD
1 stop24h 16m
Frontier
Deal found 1/19$238
This Alaska Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/226:00 am
ORD
-
GEG
1 stop9h 23m
Alaska Airlines
vie. 4/247:41 pm
GEG
-
ORD
1 stop8h 59m
Alaska Airlines
Deal found 1/20$242
This Alaska Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/53:07 pm
ORD
-
GEG
1 stop10h 52m
Alaska Airlines
mié. 3/111:23 pm
GEG
-
ORD
1 stop8h 33m
Alaska Airlines
Deal found 1/20$243

Find flight deals from Illinois to Idaho

Keep the following information in mind while searching for Illinois to Idaho flight deals. Data was last updated enero 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$229
(Alaska Airlines)

One-way from

$96
(Kiwi.com)

Popular in

November

Cheapest in

September

Average price

$425

Good round-trip deal

$317 or less

Good one-way deal

$245 or less
Provider with most accurate pricing for Chicago (CHI)-Boise Air Term. Gowen Fld flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Boise Air Term. Gowen Fld flights.
Search Deals
From Illinois to Idaho
Search Deals
One-way flight from Illinois to Idaho
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Idaho.
Search Deals
Price to beat on a one-way flight from Illinois to Idaho.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Idaho 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, Cheapflights users made 2,558,603 searches. Data last updated enero 21, 2026.
Use the filters below to find and compare flights from Illinois to Idaho that are best for you.

Fly from

Illinois

Fly to

Idaho

Route

Depart

Return

Price

ChicagoHailey

ORD - SUN

ORDSUN

Chicago O'Hare Intl

lun. 3/16

8:42 am-11:53 am

Nonstop4h 11m

Hailey Sun Valley-Friedman

jue. 3/19

12:34 pm-5:05 pm

Nonstop3h 31m

$226

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mié. 4/15

6:45 pm-11:57 pm

1 stop6h 12m

Boise Air Term. Gowen Fld

mié. 4/22

11:36 pm-8:30 am

1 stop7h 54m

$237

ChicagoHailey

ORD - SUN

ORDSUN

Chicago O'Hare Intl

mar. 3/17

7:20 am-2:49 pm

1 stop8h 29m

Hailey Sun Valley-Friedman

vie. 3/20

2:15 pm-11:52 pm

1 stop8h 37m

$246

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

mié. 4/1

3:22 pm-10:57 pm

1 stop8h 35m

Boise Air Term. Gowen Fld

lun. 4/6

8:28 pm-6:39 am

1 stop9h 11m

$249

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mié. 2/18

5:29 pm-11:01 pm

1 stop7h 32m

Spokane

mar. 2/24

1:23 pm-11:56 pm

1 stop8h 33m

$255

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mié. 4/22

6:00 am-1:23 pm

1 stop9h 23m

Spokane

lun. 4/27

3:12 pm-11:59 pm

1 stop6h 47m

$256

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

vie. 2/27

2:22 pm-7:04 pm

1 stop5h 42m

Jackson Hole

mié. 3/4

5:15 pm-12:25 am

1 stop6h 10m

$257

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mié. 2/11

8:00 am-12:44 pm

1 stop6h 44m

Spokane

mié. 2/18

5:00 am-1:11 pm

1 stop6h 11m

$257

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

lun. 3/9

5:29 pm-11:59 pm

1 stop8h 30m

Spokane

mié. 3/11

1:23 pm-11:56 pm

1 stop8h 33m

$257

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

mié. 2/18

6:10 am-4:19 pm

2 stops11h 09m

Jackson Hole

mié. 2/25

5:15 pm-12:25 am

1 stop6h 10m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Idaho

What is the cheapest month to book a flight from Illinois to Idaho?

Currently, July is the cheapest month in which you can book a flight from Illinois to Idaho (average of $149). Flying from Illinois to Idaho in December is currently the most expensive (average of $288). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to ID?

Find hourly flight availability from Illinois to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated enero 21, 2026.

It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 32% on the flight price compared to flying in the afternoon, which is usually more expensive.

Weekly flight availability from Illinois to Idaho

Explore weekly flight availability from Illinois to Idaho. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated enero 21, 2026.

The most flights from USIL to USID are scheduled on a Monday (6 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated enero 21, 2026.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,775 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Alaska Airlines
8.0
Very good
11,775 reviews
Alaska Airlines
8.0
Very good
11,775 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Southwest
8.0
Very good
4,266 reviews
Alaska Airlines
8.0
Very good
11,775 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Delta
7.9
Good
8,089 reviews
Alaska Airlines
8.0
Very good
11,775 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
United Airlines
7.4
Good
9,191 reviews
Alaska Airlines
8.0
Very good
11,775 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
American Airlines
7.2
Good
11,174 reviews
Alaska Airlines
8.0
Very good
11,775 reviews

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading

Related info for your journey

Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to Idaho?

    There are many flights that can get you from Illinois to Idaho in 4h 11m. Fly via United Airlines, Delta, or Alaska Airlines to get the fastest option. Illinois and Idaho are separated by a distance of 1337 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Illinois to Idaho one-way?

    One-way options have recently been found by users for as low as $77 on Alaska Airlines. Other airlines that offer cheap prices include Delta from $87 and Southwest from $87 one-way.

  • Can I find deals for flights from Illinois to Idaho that include hotel bookings?

    Yes. In addition to deals on Illinois to Idaho flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Idaho?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Idaho.

  • Can I find deals for business class flights from Illinois to Idaho?

    Yes. Cheapflights offers flight deals from Illinois to Idaho by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to Idaho?

    Currently, July is the cheapest month in which you can book a flight from Illinois to Idaho (average of $149). Flying from Illinois to Idaho in December is currently the most expensive (average of $288). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Illinois to Idaho

Discover the top 4 airlines that operate flights from Illinois to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated enero 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$325FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$439FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$248Average$459FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$254Average$333FlexibilityNo cancel feeOn-time63%

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