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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 1/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Dec 25 — Jan 11
Thu 12/25
Thu 1/1
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 November 25, 2025.

This Expedia deal was found by Cheapflights users on 11/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/147:00 amORD - GEG
1 stop6h 13mFrontier
Sun 12/2112:02 pmGEG - ORD
1 stop10h 10mFrontier
Deal found 11/24$208
This Priceline deal was found by Cheapflights users on 11/23. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/117:00 amORD - GEG
1 stop6h 13mFrontier
Sun 12/1412:08 pmGEG - ORD
1 stop10h 04mFrontier
Deal found 11/23$232
This Priceline deal was found by Cheapflights users on 11/23. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/47:00 amORD - GEG
1 stop6h 13mFrontier
Sun 12/712:08 pmGEG - ORD
1 stop10h 04mFrontier
Deal found 11/23$258
This United Airlines deal was found by Cheapflights users on 11/25. 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.
Fri 12/128:45 amORD - JAC
Nonstop3h 21mUnited Airlines
Mon 12/1512:02 pmJAC - ORD
Nonstop3h 03mUnited Airlines
Deal found 11/25$261
This Southwest deal was found by Cheapflights users on 11/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/155:25 amMDW - BOI
1 stop6h 45mSouthwest
Wed 12/1712:05 pmBOI - MDW
1 stop6h 30mSouthwest
Deal found 11/24$269
This Delta deal was found by Cheapflights users on 11/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/187:40 pmORD - BOI
1 stop6h 02mDelta
Sun 12/2111:51 pmBOI - ORD
1 stop7h 56mDelta
Deal found 11/23$269
This Expedia deal was found by Cheapflights users on 11/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1010:00 amORD - BOI
1 stop7h 16mMultiple Airlines
Sun 12/1412:44 pmBOI - ORD
1 stop10h 28mMultiple Airlines
Deal found 11/25$271
This Alaska Airlines deal was found by Cheapflights users on 11/24. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/158:55 amORD - BOI
1 stop16h 00mAlaska Airlines
Wed 12/1711:14 amBOI - ORD
2 stops11h 36mAlaska Airlines
Deal found 11/24$272
This Delta deal was found by Cheapflights users on 11/25. 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 12/251:35 pmORD - BOI
2 stops11h 18mDelta
Tue 1/61:40 pmBOI - ORD
1 stop9h 13mDelta
Deal found 11/25$274
This Expedia deal was found by Cheapflights users on 11/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:59 pmORD - BOI
1 stop16h 43mMultiple Airlines
Fri 12/1212:44 pmBOI - ORD
1 stop10h 28mMultiple Airlines
Deal found 11/23$277
This United Airlines deal was found by Cheapflights users on 11/24. 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.
Tue 12/91:51 pmORD - JAC
1 stop7h 46mUnited Airlines
Sat 12/132:49 pmJAC - ORD
1 stop5h 19mUnited Airlines
Deal found 11/24$281
This Delta deal was found by Cheapflights users on 11/24. 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 12/102:20 pmSTL - JAC
1 stop8h 09mDelta
Sun 12/145:50 pmJAC - STL
1 stop5h 58mDelta
Deal found 11/24$281

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 November 25, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$128
(Kiwi.com)

One-way from

$72
(Kiwi.com)

Popular in

November

Cheapest in

September

Average price

$518

Good round-trip deal

$301 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. 10% potential increase in price ($43 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 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 November 25, 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

Tue 2/3

3:35 pm-11:04 pm

1 stop9h 29m

Spokane

Wed 2/25

8:10 am-4:33 pm

1 stop6h 23m

$214

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Tue 2/3

8:00 am-3:03 pm

1 stop9h 03m

Spokane

Sat 2/28

8:10 am-4:33 pm

1 stop6h 23m

$214

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 2/14

7:00 am-12:29 pm

1 stop7h 29m

Spokane

Tue 2/17

8:10 am-4:33 pm

1 stop6h 23m

$225

ChicagoHailey

ORD - SUN

ORDSUN

Chicago O'Hare Intl

Tue 2/24

7:15 am-12:01 pm

1 stop5h 46m

Hailey Sun Valley-Friedman

Fri 2/27

12:41 pm-9:52 pm

1 stop8h 11m

$226

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 1/29

3:44 pm-10:26 pm

1 stop8h 42m

Spokane

Wed 2/25

5:00 am-1:11 pm

1 stop6h 11m

$231

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Fri 1/30

8:00 am-12:44 pm

1 stop6h 44m

Spokane

Sat 2/28

1:23 pm-11:56 pm

1 stop8h 33m

$231

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Mon 2/2

2:06 pm-6:48 pm

1 stop6h 42m

Spokane

Sat 2/28

8:10 am-4:33 pm

1 stop6h 23m

$231

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Tue 2/3

6:06 pm-12:23 am

1 stop8h 17m

Spokane

Sun 3/1

5:00 am-1:11 pm

1 stop6h 11m

$231

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 2/4

6:06 pm-11:04 pm

1 stop6h 58m

Spokane

Fri 2/27

5:00 am-1:11 pm

1 stop6h 11m

$231

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sun 2/1

8:00 am-12:44 pm

1 stop6h 44m

Spokane

Wed 2/25

5:00 am-1:11 pm

1 stop6h 11m

$231

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/22

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 December is currently the most expensive (average of $280). 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 November 25, 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 November 25, 2025.

The most flights from USIL to USID are scheduled on a Monday (7 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (1 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 November 25, 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
11,352 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
Alaska Airlines
8.0
Very good
11,352 reviews
Alaska Airlines
8.0
Very good
11,352 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
Southwest
8.0
Very good
4,254 reviews
Alaska Airlines
8.0
Very good
11,352 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
Delta
7.9
Good
7,999 reviews
Alaska Airlines
8.0
Very good
11,352 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
United Airlines
7.4
Good
9,046 reviews
Alaska Airlines
8.0
Very good
11,352 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
American Airlines
7.2
Good
11,038 reviews
Alaska Airlines
8.0
Very good
11,352 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.

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 5h 46m. Fly via Frontier, Alaska Airlines, or Delta 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 $105 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $107 and American Airlines from $128 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 December is currently the most expensive (average of $280). 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

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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 November 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$335FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$460FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$250Average$546FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$254Average$348FlexibilityNo cancel feeOn-time63%

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