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Idaho

$104+ 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 1/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jan 25 — Feb 11
Sun 1/25
Sun 2/1
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 December 26, 2025.

This American Airlines deal was found by Cheapflights users on 12/25. 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.
Thu 12/2512:30 pmORD - BOI
Nonstop3h 55mAmerican Airlines
Tue 1/63:18 pmBOI - ORD
Nonstop3h 41mAmerican Airlines
Deal found 12/25$299
This United Airlines deal was found by Cheapflights users on 12/25. 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.
Thu 12/251:55 pmORD - GEG
1 stop9h 03mUnited Airlines
Sun 12/284:00 pmGEG - ORD
1 stop5h 59mUnited Airlines
Deal found 12/25$317
This Delta deal was found by Cheapflights users on 12/25. 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.
Thu 12/256:00 amORD - BOI
1 stop9h 49mDelta
Tue 1/61:40 pmBOI - ORD
1 stop9h 13mDelta
Deal found 12/25$319
This United Airlines deal was found by Cheapflights users on 12/24. 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.
Wed 12/317:42 pmORD - BOI
Nonstop4h 17mUnited Airlines
Wed 1/710:48 amBOI - ORD
1 stop8h 17mUnited Airlines
Deal found 12/24$327
This Delta deal was found by Cheapflights users on 12/25. 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.
Thu 12/255:59 pmMDW - GEG
1 stop7h 17mDelta
Sun 12/2810:33 pmGEG - MDW
1 stop8h 32mDelta
Deal found 12/25$337
This United Airlines deal was found by Cheapflights users on 12/23. 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.
Wed 12/2412:45 pmORD - BOI
1 stop7h 28mUnited Airlines
Fri 12/266:55 pmBOI - ORD
1 stop9h 32mUnited Airlines
Deal found 12/23$351
This Delta deal was found by Cheapflights users on 12/25. 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.
Fri 12/266:30 pmORD - GEG
1 stop6h 46mDelta
Wed 12/313:32 pmGEG - ORD
1 stop6h 27mDelta
Deal found 12/25$352
This Delta deal was found by Cheapflights users on 12/25. 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.
Wed 12/311:35 pmORD - BOI
2 stops11h 18mDelta
Sun 1/45:50 amBOI - ORD
1 stop5h 51mDelta
Deal found 12/25$356
This Delta deal was found by Cheapflights users on 12/24. 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.
Thu 12/255:59 pmMDW - GEG
1 stop7h 17mDelta
Mon 12/2912:02 pmGEG - MDW
1 stop8h 20mDelta
Deal found 12/24$359
This American Airlines deal was found by Cheapflights users on 12/25. 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.
Sat 12/278:04 pmORD - BOI
Nonstop3h 55mAmerican Airlines
Wed 12/311:35 pmBOI - ORD
Nonstop3h 51mAmerican Airlines
Deal found 12/25$361
This Delta deal was found by Cheapflights users on 12/24. 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.
Thu 12/254:01 pmORD - GEG
2 stops8h 03mDelta
Wed 12/313:32 pmGEG - ORD
1 stop6h 27mDelta
Deal found 12/24$364
This Delta deal was found by Cheapflights users on 12/24. 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.
Wed 12/311:35 pmORD - BOI
2 stops11h 18mDelta
Wed 1/71:41 pmBOI - ORD
1 stop9h 18mDelta
Deal found 12/24$379

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 December 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$214
(Alaska Airlines)

One-way from

$104
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$428

Good round-trip deal

$357 or less

Good one-way deal

$127 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. 2% potential increase in price ($10 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 December 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 December 26, 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

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sun 1/11

6:15 am-3:19 pm

1 stop11h 04m

Spokane

Thu 1/15

11:22 am-9:24 pm

1 stop8h 02m

$217

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 1/21

3:44 pm-11:42 pm

1 stop8h 58m

Boise Air Term. Gowen Fld

Mon 1/26

1:55 pm-11:50 pm

1 stop8h 55m

$228

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 2/19

3:07 pm-11:30 pm

1 stop9h 23m

Boise Air Term. Gowen Fld

Mon 2/23

8:27 pm-2:11 pm

1 stop16h 44m

$228

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 2/18

4:00 pm-6:16 pm

Nonstop4h 16m

Spokane

Wed 2/25

7:00 am-12:50 pm

Nonstop3h 50m

$235

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 2/14

3:54 pm-9:37 pm

1 stop7h 43m

Spokane

Tue 2/17

12:00 pm-11:56 pm

1 stop9h 56m

$246

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 1/22

3:35 pm-11:59 pm

1 stop9h 24m

Boise Air Term. Gowen Fld

Sun 1/25

5:40 am-1:10 pm

1 stop6h 30m

$248

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 2/26

7:00 am-3:08 pm

1 stop9h 08m

Boise Air Term. Gowen Fld

Sun 3/1

5:40 am-1:11 pm

1 stop6h 31m

$248

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 2/20

7:00 am-3:08 pm

1 stop9h 08m

Boise Air Term. Gowen Fld

Sun 2/22

7:00 am-11:59 pm

1 stop15h 59m

$248

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 2/27

3:54 pm-10:40 pm

1 stop7h 46m

Boise Air Term. Gowen Fld

Sun 3/1

5:40 am-1:11 pm

1 stop6h 31m

$248

ChicagoSpokane

MDW - GEG

MDWGEG

Chicago Midway

Wed 3/4

6:00 am-11:35 am

1 stop7h 35m

Spokane

Wed 3/11

6:00 am-1:25 pm

1 stop5h 25m

$255

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/23

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 December 26, 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 December 26, 2025.

The most flights from USIL to USID are scheduled on a Wednesday (6 on average). You will have fewer flight options on Monday, 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 December 26, 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
11,534 reviews

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Georgana,Dec 2025

ORD - PDX

Very cordial grew. Thank you. However, crying baby issues and no ear plugs available.
Alaska Airlines
8.0
Very good
11,534 reviews
Alaska Airlines
8.0
Very good
11,534 reviews

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Georgana,Dec 2025

ORD - PDX

Very cordial grew. Thank you. However, crying baby issues and no ear plugs available.
Southwest
8.0
Very good
4,258 reviews
Alaska Airlines
8.0
Very good
11,534 reviews

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Georgana,Dec 2025

ORD - PDX

Very cordial grew. Thank you. However, crying baby issues and no ear plugs available.
Delta
7.9
Good
8,013 reviews
Alaska Airlines
8.0
Very good
11,534 reviews

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Georgana,Dec 2025

ORD - PDX

Very cordial grew. Thank you. However, crying baby issues and no ear plugs available.
United Airlines
7.4
Good
9,115 reviews
Alaska Airlines
8.0
Very good
11,534 reviews

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Georgana,Dec 2025

ORD - PDX

Very cordial grew. Thank you. However, crying baby issues and no ear plugs available.
American Airlines
7.2
Good
11,061 reviews
Alaska Airlines
8.0
Very good
11,534 reviews

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Georgana,Dec 2025

ORD - PDX

Very cordial grew. Thank you. However, crying baby issues and no ear plugs available.

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 16m. Fly via Frontier, Alaska Airlines, or United 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 $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

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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 December 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$333FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$421FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$249Average$497FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$254Average$339FlexibilityNo cancel feeOn-time63%

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