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$54+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Nov 12 — Nov 191
Wed 11/12
Wed 11/19
1 adult, Economy
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Cheap flight deals from Idaho to Illinois

Keep the following information in mind while searching for Idaho to Illinois flight deals. Data was last updated October 13, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$200
(Trip.com)

One-way from

$54
(Frontier)

Popular in

December

Cheapest in

February

Average price

$408

Good round-trip deal

$340 or less

Good one-way deal

$231 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Chicago (CHI) flights.
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From Idaho to Illinois
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One-way flight from Idaho to Illinois
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Highest demand for flights based on searches. 5% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Idaho to Illinois.
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Price to beat on a one-way flight from Idaho to Illinois.
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Find 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 October 13, 2025.

This Trip.com deal was found by Cheapflights users on 10/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/67:15 amGEG - ORD
1 stop7h 40mHawaiian Airlines
Sat 12/133:05 pmORD - GEG
1 stop10h 54mHawaiian Airlines
Deal found 10/12$200
This Frontier deal was found by Cheapflights users on 10/11. 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.
Thu 10/3012:03 pmGEG - ORD
1 stop10h 40mFrontier
Sun 11/25:00 amORD - GEG
1 stop7h 08mFrontier
Deal found 10/11$212
This Alaska Airlines deal was found by Cheapflights users on 10/12. 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.
Wed 12/107:00 amGEG - ORD
1 stop10h 54mAlaska Airlines
Tue 1/203:35 pmORD - GEG
1 stop9h 29mAlaska Airlines
Deal found 10/12$214
This Alaska Airlines deal was found by Cheapflights users on 10/12. 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.
Tue 11/1110:15 amGEG - ORD
1 stop9h 25mAlaska Airlines
Tue 11/183:25 pmORD - GEG
1 stop9h 34mAlaska Airlines
Deal found 10/12$231
This American Airlines deal was found by Cheapflights users on 10/12. 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.
Tue 11/111:14 pmGEG - ORD
Nonstop3h 58mAmerican Airlines
Tue 11/1810:30 amORD - GEG
Nonstop4h 02mAmerican Airlines
Deal found 10/12$235
This Alaska Airlines deal was found by Cheapflights users on 10/12. 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.
Thu 12/410:00 amGEG - ORD
1 stop10h 30mAlaska Airlines
Mon 12/83:05 pmORD - GEG
1 stop10h 54mAlaska Airlines
Deal found 10/12$236
This KAYAK deal was found by Cheapflights users on 10/13. 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.
Thu 12/117:00 amGEG - ORD
1 stop10h 54mAlaska Airlines
Mon 12/156:00 amORD - GEG
1 stop8h 39mAlaska Airlines
Deal found 10/13$241
This Alaska Airlines deal was found by Cheapflights users on 10/12. 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.
Wed 11/512:33 pmGEG - ORD
1 stop14h 28mAlaska Airlines
Sat 11/82:05 pmORD - GEG
1 stop6h 47mAlaska Airlines
Deal found 10/12$242
This Delta deal was found by Cheapflights users on 10/12. 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.
Mon 11/36:53 pmIDA - ORD
2 stops12h 39mDelta
Wed 11/127:20 amORD - IDA
1 stop6h 14mDelta
Deal found 10/12$242
This United Airlines deal was found by Cheapflights users on 10/12. 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 11/114:05 pmGEG - ORD
1 stop5h 54mUnited Airlines
Tue 11/189:15 amORD - GEG
Nonstop4h 16mUnited Airlines
Deal found 10/12$245
This Kiwi.com deal was found by Cheapflights users on 10/12. 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.
Sun 11/912:03 pmGEG - ORD
2 stops20h 38mFrontier
Sun 11/166:00 amORD - GEG
1 stop7h 08mFrontier
Deal found 10/12$246
This Alaska Airlines deal was found by Cheapflights users on 10/12. 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.
Thu 11/2010:15 amGEG - ORD
1 stop9h 25mAlaska Airlines
Mon 11/246:00 amORD - GEG
1 stop7h 01mAlaska Airlines
Deal found 10/12$248

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 October 13, 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

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Sat 12/6

7:15 am-4:55 pm

1 stop7h 40m

Chicago O'Hare Intl

Sat 12/13

3:05 pm-11:59 pm

1 stop10h 54m

$200

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 3/3

7:20 pm-5:04 am

1 stop7h 44m

Chicago O'Hare Intl

Wed 3/4

7:45 am-12:50 pm

1 stop7h 05m

$209

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 3/3

8:40 pm-5:04 am

1 stop6h 24m

Chicago O'Hare Intl

Wed 3/4

7:45 am-12:50 pm

1 stop7h 05m

$209

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 11/11

10:15 am-9:40 pm

1 stop9h 25m

Chicago O'Hare Intl

Tue 11/18

3:25 pm-10:59 pm

1 stop9h 34m

$231

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 11/18

5:51 am-4:30 pm

1 stop8h 39m

Chicago O'Hare Intl

Sun 11/23

6:00 am-11:01 am

1 stop7h 01m

$231

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Sun 12/7

8:47 pm-6:21 am

1 stop7h 34m

Chicago O'Hare Intl

Sat 12/13

3:05 pm-11:59 pm

1 stop10h 54m

$231

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Mon 11/3

6:53 pm-8:32 am

2 stops12h 39m

Chicago O'Hare Intl

Wed 11/12

7:20 am-12:34 pm

1 stop6h 14m

$242

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Mon 11/3

6:53 pm-8:32 am

2 stops12h 39m

Chicago O'Hare Intl

Tue 11/11

7:20 am-12:34 pm

1 stop6h 14m

$242

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Fri 12/5

5:51 am-4:55 pm

1 stop9h 04m

Chicago O'Hare Intl

Mon 12/8

3:05 pm-11:59 pm

1 stop10h 54m

$242

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 11/5

12:33 pm-5:01 am

1 stop14h 28m

Chicago O'Hare Intl

Sat 11/8

2:05 pm-6:52 pm

1 stop6h 47m

$242

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/11

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 October 13, 2025.

It’s optimal to fly from Idaho to Illinois in the evening. By choosing this option you can save up to 33% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Idaho to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Idaho to Illinois. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Idaho to Illinois flight should consider departing on Monday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 13, 2025.

The most flights from USID to USIL are scheduled on a Monday (9 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (7 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 October 13, 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
11,065 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
11,065 reviews
Alaska Airlines
8.0
Very good
11,065 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Southwest
8.0
Very good
4,235 reviews
Alaska Airlines
8.0
Very good
11,065 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
8.0
Very good
7,971 reviews
Alaska Airlines
8.0
Very good
11,065 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,970 reviews
Alaska Airlines
8.0
Very good
11,065 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
American Airlines
7.2
Good
11,046 reviews
Alaska Airlines
8.0
Very good
11,065 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

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 40m. There are 1493 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?

    $107 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 Frontier and Delta, with prices starting from $113 and $124, 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 October 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$139Average$358FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$217Average$327FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$231Average$479FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$233Average$383FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$255Average$479FlexibilityNo cancel feeOn-time71%

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