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$66+ Cheap flights from Idaho to Illinois

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 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
ene. 1 — ene. 81
jue. 1/1
jue. 1/8
1 adult, Economy
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Cheap flight deals from Idaho to Illinois

Cheapest flights from Idaho to Illinois
Explore the most affordable flight options available from Idaho to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 2, 2025.

This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/256:00 amGEG - ORD
Nonstop3h 50mAmerican Airlines
sáb. 1/37:19 pmORD - GEG
Nonstop4h 09mAmerican Airlines
Deal found 11/30$236
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/177:00 amBOI - ORD
1 stop11h 54mMultiple Airlines
dom. 1/47:00 amORD - BOI
1 stop5h 43mMultiple Airlines
Deal found 12/1$242
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/253:15 pmGEG - MDW
1 stop6h 25mSouthwest
sáb. 1/35:15 amMDW - GEG
1 stop6h 00mSouthwest
Deal found 11/30$255
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/3111:58 amBOI - ORD
1 stop11h 01mAlaska Airlines
mié. 1/79:00 amORD - BOI
2 stops14h 09mAlaska Airlines
Deal found 12/2$259
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1212:44 pmBOI - ORD
1 stop10h 28mMultiple Airlines
lun. 12/153:05 pmORD - BOI
1 stop9h 50mMultiple Airlines
Deal found 12/1$271
This Flightnetwork 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1212:44 pmBOI - ORD
1 stop10h 28mFrontier
dom. 12/147:00 amORD - BOI
1 stop5h 49mFrontier
Deal found 12/1$280
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/171:25 pmBOI - ORD
1 stop6h 59mAmerican Airlines
dom. 1/48:04 pmORD - BOI
Nonstop3h 55mAmerican Airlines
Deal found 12/1$289
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/251:00 pmBOI - ORD
1 stop7h 36mDelta
jue. 1/14:01 pmORD - BOI
1 stop8h 52mDelta
Deal found 12/1$292
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/1510:41 pmBOI - STL
2 stops34h 33mMultiple Airlines
jue. 12/185:19 pmSTL - BOI
1 stop23h 25mMultiple Airlines
Deal found 12/1$293
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/119:13 pmGEG - STL
1 stop12h 59mMultiple Airlines
mié. 12/177:43 pmSTL - GEG
2 stops22h 10mMultiple Airlines
Deal found 12/1$293
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/138:26 pmBOI - ORD
1 stop8h 55mAlaska Airlines
mar. 12/163:05 pmORD - BOI
1 stop9h 50mAlaska Airlines
Deal found 11/30$298
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/145:35 amBOI - MDW
1 stop6h 35mDelta
sáb. 1/35:59 pmMDW - BOI
1 stop6h 54mDelta
Deal found 11/30$299

Find flight deals from Idaho to Illinois

Keep the following information in mind while searching for Idaho to Illinois flight deals. Data was last updated diciembre 2, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$185
(Alaska Airlines)

One-way from

$66
(WAYA)

Popular in

December

Cheapest in

February

Average price

$452

Good round-trip deal

$352 or less

Good one-way deal

$233 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Chicago (CHI) flights.
Search Deals
From Idaho to Illinois
Search Deals
One-way flight from Idaho to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($17 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 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 Idaho to Illinois.
Search Deals
Price to beat on a one-way flight from Idaho to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho to Illinois 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 diciembre 2, 2025.
Use the filters below to find and compare flights from Idaho to Illinois that are best for you.

Fly from

Idaho

Fly to

Illinois

Route

Depart

Return

Price

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

vie. 1/23

7:55 pm-2:29 pm

1 stop17h 34m

Chicago O'Hare Intl

mar. 1/27

9:00 am-10:09 pm

2 stops14h 09m

$186

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mar. 1/20

6:00 am-4:14 pm

1 stop8h 14m

Lambert-St Louis

lun. 2/2

11:55 am-6:49 pm

1 stop8h 54m

$195

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

vie. 1/23

7:55 pm-11:37 pm

1 stop26h 42m

Chicago O'Hare Intl

lun. 2/2

3:44 pm-11:42 pm

1 stop8h 58m

$197

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

jue. 1/8

6:40 am-2:45 pm

1 stop7h 05m

Chicago Midway

mié. 1/14

8:10 am-3:20 pm

1 stop8h 10m

$198

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

jue. 1/15

1:40 pm-11:53 pm

1 stop9h 13m

Chicago O'Hare Intl

dom. 1/18

7:30 am-8:12 pm

1 stop13h 42m

$213

SpokaneChicago

GEG - ORD

GEGORD

Spokane

jue. 1/15

1:20 pm-11:53 pm

1 stop8h 33m

Chicago O'Hare Intl

dom. 1/18

7:30 am-8:58 pm

1 stop15h 28m

$213

SpokaneChicago

GEG - ORD

GEGORD

Spokane

vie. 1/23

5:05 am-1:22 pm

1 stop6h 17m

Chicago O'Hare Intl

lun. 1/26

2:20 pm-6:45 pm

1 stop6h 25m

$213

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

jue. 1/8

6:05 am-3:25 pm

1 stop8h 20m

Chicago O'Hare Intl

mié. 1/14

2:15 pm-10:30 pm

2 stops9h 15m

$214

SpokaneChicago

GEG - ORD

GEGORD

Spokane

lun. 2/23

3:40 pm-11:52 pm

1 stop6h 12m

Chicago O'Hare Intl

sáb. 2/28

2:03 pm-10:42 pm

2 stops10h 39m

$230

SpokaneChicago

GEG - ORD

GEGORD

Spokane

jue. 1/15

5:45 am-5:10 pm

1 stop9h 25m

Chicago O'Hare Intl

dom. 1/18

8:00 am-12:44 pm

1 stop6h 44m

$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 Idaho to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Idaho 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 Idaho to Illinois

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

Currently, May is the cheapest month in which you can book a flight from Idaho to Illinois (average of $87). Flying from Idaho to Illinois in March is currently the most expensive (average of $268). 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 ID to IL?

Find hourly flight availability from Idaho to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated diciembre 2, 2025.

It’s optimal to fly from Idaho to Illinois in the evening. By choosing this option you can save up to 32% on the cost of your flight, compared to a flight in the morning.

Weekly flight availability from Idaho to Illinois

Explore weekly flight availability from Idaho to Illinois. 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 diciembre 2, 2025.

The most flights from USID to USIL are scheduled on a Monday (8 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated diciembre 2, 2025.
Read through reviews of airlines operating flights from Idaho to Illinois, such as Alaska Airlines, Southwest, and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,388 reviews

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

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

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

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

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

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

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

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

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

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

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

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 Idaho to Illinois. 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 Idaho to Illinois?

    Departing from Idaho to Illinois will take you 7h 05m. There are 1444 mi between Idaho and Illinois. This flight may include one or multiple stops.

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

    $87 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on Southwest and Delta, with prices starting from $87 and $87, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho to Illinois 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 Idaho to Illinois?

    Currently, May is the cheapest month in which you can book a flight from Idaho to Illinois (average of $87). Flying from Idaho to Illinois in March is currently the most expensive (average of $268). 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 Idaho to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Idaho to Illinois

Discover the top 5 airlines that operate flights from Idaho to Illinois. 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 diciembre 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$134Average$280FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$224Average$353FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$232Average$536FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$233Average$393FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$255Average$474FlexibilityNo cancel feeOn-time71%

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