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Illinois

$84+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$189
(Southwest)

One-way from

$84
(Mytrip)

Popular in

December

Cheapest in

January

Average price

$389

Good round-trip deal

$413 or less

Good one-way deal

$189 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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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 25, 2025.

This Southwest deal was found by Cheapflights users on 3/24. 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.
Wed 4/2311:45 amBOI - ORD
1 stop10h 55mSouthwest
Sat 4/267:00 amORD - BOI
1 stop10h 10mSouthwest
Deal found 3/24$186
This Southwest deal was found by Cheapflights users on 3/24. 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.
Thu 5/81:50 pmBOI - MDW
1 stop9h 05mSouthwest
Sun 5/115:45 amMDW - BOI
1 stop5h 25mSouthwest
Deal found 3/24$189
This Delta deal was found by Cheapflights users on 3/24. 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.
Fri 4/2511:30 pmBOI - MDW
1 stop8h 37mDelta
Mon 4/287:00 pmMDW - BOI
1 stop6h 03mDelta
Deal found 3/24$202
This Delta deal was found by Cheapflights users on 3/24. 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.
Fri 4/256:15 amBOI - ORD
1 stop5h 33mDelta
Mon 4/282:15 pmORD - BOI
1 stop8h 46mDelta
Deal found 3/24$202
This United Airlines deal was found by Cheapflights users on 3/23. 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 9/1710:39 amBOI - ORD
1 stop6h 27mUnited Airlines
Sat 9/209:01 amORD - BOI
Nonstop3h 54mUnited Airlines
Deal found 3/23$208
This Delta deal was found by Cheapflights users on 3/24. 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 5/811:09 pmGEG - MDW
1 stop8h 31mDelta
Tue 5/137:25 pmMDW - GEG
1 stop5h 50mDelta
Deal found 3/24$216
This Delta deal was found by Cheapflights users on 3/24. 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.
Tue 5/133:30 pmGEG - ORD
1 stop6h 29mDelta
Thu 5/151:30 pmORD - GEG
1 stop10h 29mDelta
Deal found 3/24$216
This American Airlines deal was found by Cheapflights users on 3/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/141:20 pmBOI - ORD
Nonstop3h 35mAmerican Airlines
Mon 8/189:45 amORD - BOI
Nonstop3h 55mAmerican Airlines
Deal found 3/24$224
This Southwest deal was found by Cheapflights users on 3/24. 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.
Wed 4/236:35 amBOI - STL
1 stop6h 00mSouthwest
Wed 4/305:45 amSTL - BOI
1 stop7h 25mSouthwest
Deal found 3/24$227
This Hawaiian Airlines deal was found by Cheapflights users on 3/24. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/254:00 pmBOI - ORD
1 stop6h 39mHawaiian Airlines
Wed 7/26:00 amORD - BOI
1 stop7h 20mHawaiian Airlines
Deal found 3/24$234
This Southwest deal was found by Cheapflights users on 3/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/286:15 amGEG - ORD
1 stop7h 10mSouthwest
Sat 5/315:25 pmORD - GEG
1 stop6h 40mSouthwest
Deal found 3/23$240
This American Airlines deal was found by Cheapflights users on 3/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/271:40 pmGEG - ORD
Nonstop3h 51mAmerican Airlines
Sat 8/306:00 amORD - GEG
1 stop7h 36mAmerican Airlines
Deal found 3/23$247

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 March 25, 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

Wed 4/23

11:45 am-11:40 pm

1 stop10h 55m

Chicago O'Hare Intl

Sat 4/26

7:00 am-4:10 pm

1 stop10h 10m

$186

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Thu 5/8

1:50 pm-11:55 pm

1 stop9h 05m

Chicago Midway

Sun 5/11

5:45 am-10:10 am

1 stop5h 25m

$189

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Fri 4/25

11:30 pm-9:07 am

1 stop8h 37m

Chicago Midway

Mon 4/28

7:00 pm-12:03 am

1 stop6h 03m

$202

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Fri 4/25

6:15 am-12:48 pm

1 stop5h 33m

Chicago O'Hare Intl

Mon 4/28

2:15 pm-10:01 pm

1 stop8h 46m

$202

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Thu 5/8

11:09 pm-9:40 am

1 stop8h 31m

Chicago Midway

Tue 5/13

7:25 pm-11:15 pm

1 stop5h 50m

$216

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 5/7

2:15 pm-11:59 pm

1 stop7h 44m

Chicago O'Hare Intl

Thu 5/15

1:30 pm-9:59 pm

1 stop10h 29m

$216

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Wed 4/23

5:25 pm-12:35 am

1 stop6h 10m

Chicago O'Hare Intl

Sat 4/26

7:35 pm-10:49 pm

Nonstop4h 14m

$223

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 4/23

6:35 am-1:35 pm

1 stop6h 00m

Lambert-St Louis

Wed 4/30

5:45 am-12:10 pm

1 stop7h 25m

$227

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Fri 4/18

7:30 pm-5:59 am

1 stop8h 29m

Chicago O'Hare Intl

Wed 4/23

6:00 am-5:37 pm

2 stops13h 37m

$242

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Mon 4/7

8:59 pm-5:59 am

1 stop8h 00m

Chicago O'Hare Intl

Wed 4/9

5:53 pm-11:58 pm

1 stop7h 05m

$246

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

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, August is the cheapest month in which you can book a flight from Idaho to Illinois (average of $245). Flying from Idaho to Illinois in March is currently the most expensive (average of $323). 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 March 25, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to Illinois as you normally would.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 March 25, 2025.
Read through reviews of airlines operating flights from Idaho to Illinois, such as Alaska Airlines, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,785 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,272 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,890 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,330 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,605 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.

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

    $84 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on Southwest and United Airlines, with prices starting from $85 and $85, 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, August is the cheapest month in which you can book a flight from Idaho to Illinois (average of $245). Flying from Idaho to Illinois in March is currently the most expensive (average of $323). 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 6 airlines flying from Idaho to Illinois

Discover the top 6 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 March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$128Average$261FlexibilityNo cancel feeOn-time65%
DeltaCheapest$185Average$386FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$217Average$353FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$236Average$545FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$258Average$416FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$283Average$593FlexibilityNo cancel feeOn-time69%
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