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Idaho

$80+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jan 1 — Jan 81
Thu 1/1
Thu 1/8
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 2, 2025.

This Priceline deal was found by Cheapflights users on 11/30. 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 11/30$228
This United Airlines deal was found by Cheapflights users on 12/2. 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 12/176:55 amORD - BOI
1 stop10h 08mUnited Airlines
Thu 12/2512:20 pmBOI - ORD
Nonstop3h 44mUnited Airlines
Deal found 12/2$289
This Delta deal was found by Cheapflights users on 12/2. 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 12/172:20 pmSTL - JAC
1 stop8h 09mDelta
Sun 12/212:31 pmJAC - STL
1 stop8h 11mDelta
Deal found 12/2$290
This Delta deal was found by Cheapflights users on 12/2. 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.
Tue 12/167:20 amORD - GEG
1 stop6h 50mDelta
Thu 12/253:32 pmGEG - ORD
1 stop6h 27mDelta
Deal found 12/2$290
This Delta deal was found by Cheapflights users on 12/2. 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 12/2$298
This United Airlines deal was found by Cheapflights users on 12/1. 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 12/168:45 amORD - JAC
Nonstop3h 21mUnited Airlines
Sat 12/2012:35 pmJAC - ORD
Nonstop3h 15mUnited Airlines
Deal found 12/1$300
This Delta deal was found by Cheapflights users on 12/2. 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.
Tue 12/167:20 amORD - GEG
2 stops13h 35mDelta
Wed 12/247:10 amGEG - ORD
1 stop28h 10mDelta
Deal found 12/2$300
This Frontier deal was found by Cheapflights users on 12/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/217:00 amORD - BOI
1 stop5h 43mFrontier
Sat 12/2712:54 pmBOI - ORD
1 stop10h 18mFrontier
Deal found 12/1$302
This Expedia deal was found by Cheapflights users on 11/29. 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.
Fri 12/127:00 amORD - BOI
1 stop5h 49mMultiple Airlines
Wed 1/1412:46 pmBOI - ORD
2 stops10h 04mMultiple Airlines
Deal found 11/29$303
This Delta deal was found by Cheapflights users on 12/2. 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 12/177:20 amORD - BOI
2 stops9h 42mDelta
Thu 12/251:00 pmBOI - ORD
1 stop7h 36mDelta
Deal found 12/2$304
This American Airlines deal was found by Cheapflights users on 11/29. 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 12/610:25 amORD - GEG
Nonstop4h 05mAmerican Airlines
Sat 12/131:14 pmGEG - ORD
Nonstop4h 03mAmerican Airlines
Deal found 11/29$305
This United Airlines deal was found by Cheapflights users on 12/2. 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 12/171:35 pmSTL - JAC
1 stop8h 02mUnited Airlines
Sun 12/2110:37 amJAC - STL
2 stops11h 06mUnited Airlines
Deal found 12/2$307

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 2, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$198
(Delta)

One-way from

$80
(Southwest)

Popular in

November

Cheapest in

September

Average price

$474

Good round-trip deal

$305 or less

Good one-way deal

$320 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. 9% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 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 2, 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

Wed 3/4

7:40 am-2:58 pm

1 stop9h 18m

Spokane

Sun 3/8

3:27 pm-11:53 pm

1 stop6h 26m

$198

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 2/25

2:20 pm-8:56 pm

1 stop8h 36m

Spokane

Sun 3/1

3:40 pm-11:52 pm

1 stop6h 12m

$198

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 1/8

2:20 pm-6:45 pm

1 stop6h 25m

Spokane

Mon 1/12

1:20 pm-11:53 pm

1 stop8h 33m

$201

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 1/22

7:30 am-3:00 pm

1 stop9h 30m

Spokane

Sun 1/25

3:40 pm-11:53 pm

1 stop6h 13m

$213

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Fri 1/9

1:50 pm-8:58 pm

2 stops9h 08m

Spokane

Mon 1/12

1:20 pm-11:53 pm

1 stop8h 33m

$218

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 1/8

7:00 am-12:07 pm

1 stop7h 07m

Spokane

Mon 1/12

2:00 pm-11:25 pm

1 stop7h 25m

$219

ChicagoHailey

ORD - SUN

ORDSUN

Chicago O'Hare Intl

Fri 1/9

7:20 am-2:50 pm

1 stop8h 30m

Hailey Sun Valley-Friedman

Tue 1/13

12:55 pm-9:52 pm

1 stop7h 57m

$226

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 1/8

1:50 pm-8:58 pm

2 stops9h 08m

Spokane

Sun 1/11

1:20 pm-11:53 pm

1 stop8h 33m

$230

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 2/14

5:29 pm-11:59 pm

1 stop8h 30m

Spokane

Tue 2/17

7:05 am-4:33 pm

1 stop7h 28m

$231

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 1/14

3:35 pm-9:25 pm

1 stop7h 50m

Spokane

Sun 1/18

5:00 am-1:10 pm

1 stop6h 10m

$231

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/1

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 $281). 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 2, 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 2, 2025.

The most flights from USIL to USID are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, 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 December 2, 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
11,388 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Alaska Airlines
8.0
Very good
11,388 reviews
Alaska Airlines
8.0
Very good
11,388 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Southwest
8.0
Very good
4,253 reviews
Alaska Airlines
8.0
Very good
11,388 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Delta
7.9
Good
8,011 reviews
Alaska Airlines
8.0
Very good
11,388 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
United Airlines
7.4
Good
9,063 reviews
Alaska Airlines
8.0
Very good
11,388 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
American Airlines
7.2
Good
11,045 reviews
Alaska Airlines
8.0
Very good
11,388 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.

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 17m. Fly via Delta, United Airlines, 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 $147). Flying from Illinois to Idaho in December is currently the most expensive (average of $281). 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 December 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$335FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$460FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$249Average$532FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$254Average$345FlexibilityNo cancel feeOn-time63%

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