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$72+ 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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
dic. 18 — dic. 251
jue. 12/18
jue. 12/25
1 adult, Economy
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Find 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 noviembre 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/17. 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. 12/107:43 pmSTL - GEG
1 stop17h 30mFrontier
dom. 12/1412:08 pmGEG - STL
1 stop20h 06mFrontier
Deal found 11/17$165
This Kiwi.com deal was found by Cheapflights users on 11/17. 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. 12/37:43 pmSTL - BOI
1 stop17h 06mFrontier
dom. 12/712:44 pmBOI - STL
2 stops20h 08mFrontier
Deal found 11/17$172
This Kiwi.com deal was found by Cheapflights users on 11/18. 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. 12/38:36 amORD - GEG
2 stops28h 37mFrontier
dom. 12/712:08 pmGEG - ORD
1 stop10h 04mFrontier
Deal found 11/18$203
This Delta deal was found by Cheapflights users on 11/16. 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.
vie. 12/122:38 pmSTL - GEG
2 stops11h 33mDelta
mar. 12/167:35 pmGEG - STL
2 stops11h 35mDelta
Deal found 11/16$236
This American Airlines deal was found by Cheapflights users on 11/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1210:25 amORD - GEG
Nonstop4h 05mAmerican Airlines
mié. 12/171:14 pmGEG - ORD
Nonstop4h 03mAmerican Airlines
Deal found 11/17$252
This Kiwi.com deal was found by Cheapflights users on 11/17. 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.
jue. 12/111:16 pmSTL - GEG
1 stop9h 07mMultiple Airlines
dom. 12/1412:08 pmGEG - STL
1 stop20h 06mMultiple Airlines
Deal found 11/17$255
This Delta deal was found by Cheapflights users on 11/18. 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.
jue. 12/116:00 amSTL - BOI
2 stops11h 02mDelta
lun. 12/151:54 pmBOI - STL
2 stops9h 54mDelta
Deal found 11/18$256
This Southwest deal was found by Cheapflights users on 11/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/86:00 pmMDW - BOI
1 stop6h 10mSouthwest
mié. 12/105:15 amBOI - MDW
1 stop5h 10mSouthwest
Deal found 11/17$269
This Delta deal was found by Cheapflights users on 11/18. 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.
jue. 12/187:40 pmORD - BOI
1 stop6h 02mDelta
dom. 12/2111:51 pmBOI - ORD
1 stop7h 56mDelta
Deal found 11/18$269
This Delta deal was found by Cheapflights users on 11/17. 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.
jue. 12/116:10 pmORD - GEG
1 stop8h 01mDelta
mié. 12/176:05 amGEG - ORD
2 stops10h 40mDelta
Deal found 11/17$270
This Delta deal was found by Cheapflights users on 11/16. 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.
sáb. 12/138:50 amORD - BOI
2 stops11h 44mDelta
lun. 12/152:04 pmBOI - ORD
1 stop6h 52mDelta
Deal found 11/16$274
This Kiwi.com deal was found by Cheapflights users on 11/17. 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.
vie. 12/197:00 amORD - BOI
1 stop29h 59mFrontier
jue. 12/2512:38 pmBOI - ORD
1 stop10h 34mFrontier
Deal found 11/17$276

Cheap flight deals from Illinois to Idaho

Keep the following information in mind while searching for Illinois to Idaho flight deals. Data was last updated noviembre 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$165
(Kiwi.com)

One-way from

$72
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$454

Good round-trip deal

$298 or less

Good one-way deal

$295 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. 13% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 noviembre 18, 2025.
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

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mié. 12/10

7:43 pm-11:13 am

1 stop17h 30m

Spokane

dom. 12/14

12:08 pm-9:52 am

2 stops19h 44m

$217

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

vie. 12/12

2:38 pm-12:11 am

2 stops11h 33m

Spokane

mar. 12/16

7:35 pm-9:10 am

2 stops11h 35m

$236

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

vie. 12/12

2:38 pm-12:11 am

2 stops11h 33m

Spokane

mié. 12/17

6:05 am-7:10 pm

2 stops11h 05m

$236

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

vie. 1/9

6:06 pm-11:04 pm

1 stop6h 58m

Spokane

lun. 1/12

5:00 am-1:10 pm

1 stop6h 10m

$248

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

jue. 12/11

1:16 pm-8:23 pm

1 stop9h 07m

Spokane

dom. 12/14

12:08 pm-10:14 am

1 stop20h 06m

$255

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 12/11

6:00 am-4:02 pm

2 stops11h 02m

Boise Air Term. Gowen Fld

lun. 12/15

1:54 pm-12:48 am

2 stops9h 54m

$256

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

mar. 1/20

6:40 am-11:58 am

1 stop6h 18m

Jackson Hole

sáb. 1/24

12:58 pm-9:38 pm

1 stop7h 40m

$257

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

jue. 1/8

7:10 am-1:30 pm

1 stop7h 20m

Jackson Hole

mar. 1/13

12:58 pm-9:35 pm

1 stop7h 37m

$257

ChicagoJackson

ORD - JAC

ORDJAC

Chicago O'Hare Intl

vie. 1/30

1:50 pm-7:06 pm

1 stop6h 16m

Jackson Hole

vie. 2/6

12:58 pm-9:52 pm

1 stop7h 54m

$257

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mar. 3/3

5:25 am-11:37 am

1 stop8h 12m

Spokane

mar. 3/10

6:10 am-5:59 pm

2 stops9h 49m

$260

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/17

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 $147). Flying from Illinois to Idaho in January is currently the most expensive (average of $271). 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 noviembre 18, 2025.

It’s typically best to fly out from Illinois to Idaho in the evening. Doing so could potentially save you 30% on the flight price compared to flying in the morning, 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 noviembre 18, 2025.

The most flights from USIL to USID are scheduled on a Monday (8 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 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 noviembre 18, 2025.
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
11,317 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Alaska Airlines
8.0
Very good
11,317 reviews
Alaska Airlines
8.0
Very good
11,317 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Southwest
8.0
Very good
4,248 reviews
Alaska Airlines
8.0
Very good
11,317 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Delta
7.9
Good
8,003 reviews
Alaska Airlines
8.0
Very good
11,317 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
United Airlines
7.4
Good
9,019 reviews
Alaska Airlines
8.0
Very good
11,317 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
American Airlines
7.2
Good
11,045 reviews
Alaska Airlines
8.0
Very good
11,317 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.

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 6h 58m. Fly via Frontier, Delta, or Alaska Airlines to get the fastest option. Illinois and Idaho are separated by a distance of 1493 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 $96 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $107 and Southwest from $135 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 $147). Flying from Illinois to Idaho in January is currently the most expensive (average of $271). 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

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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 noviembre 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$335FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$464FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$253Average$532FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$254Average$348FlexibilityNo cancel feeOn-time63%

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