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Illinois

$78+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$175
(Delta)

One-way from

$78
(Southwest)

Popular in

December

Cheapest in

January

Average price

$388

Good round-trip deal

$415 or less

Good one-way deal

$139 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. 0% potential increase in price ($3 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This Delta deal was found by Cheapflights users on 4/15. 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 7/210:24 amBOI - MDW
1 stop6h 16mDelta
Mon 7/79:20 amMDW - BOI
1 stop5h 40mDelta
Deal found 4/15$175
This Delta deal was found by Cheapflights users on 4/17. 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 7/21:00 pmBOI - ORD
1 stop8h 09mDelta
Mon 7/79:30 amORD - BOI
1 stop5h 30mDelta
Deal found 4/17$175
This Delta deal was found by Cheapflights users on 4/17. 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 6/137:27 pmGEG - ORD
2 stops11h 00mDelta
Mon 6/167:20 pmORD - GEG
1 stop6h 22mDelta
Deal found 4/17$204
This American Airlines deal was found by Cheapflights users on 4/17. 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.
Fri 9/51:39 pmGEG - ORD
Nonstop3h 41mAmerican Airlines
Sun 9/710:45 amORD - GEG
Nonstop3h 50mAmerican Airlines
Deal found 4/17$212
This Southwest deal was found by Cheapflights users on 4/16. 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.
Sun 6/83:35 pmBOI - MDW
Nonstop3h 25mSouthwest
Sat 6/147:50 amMDW - BOI
Nonstop3h 40mSouthwest
Deal found 4/16$220
This Hawaiian Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/98:03 amGEG - ORD
1 stop7h 58mHawaiian Airlines
Sun 5/116:00 amORD - GEG
1 stop6h 50mHawaiian Airlines
Deal found 4/16$222
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Mon 6/237:07 pmBOI - ORD
1 stop9h 22mUnited Airlines
Mon 6/308:45 amORD - BOI
Nonstop3h 58mUnited Airlines
Deal found 4/17$225
This Delta deal was found by Cheapflights users on 4/16. 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 5/911:20 pmGEG - MDW
1 stop8h 20mDelta
Sun 5/117:25 pmMDW - GEG
1 stop5h 50mDelta
Deal found 4/16$226
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/28:03 amGEG - ORD
1 stop6h 57mAlaska Airlines
Tue 5/65:56 pmORD - GEG
1 stop8h 03mAlaska Airlines
Deal found 4/16$227
This Flightnetwork deal was found by Cheapflights users on 4/17. 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.
Sun 6/112:36 pmBOI - ORD
1 stop10h 23mFrontier
Sun 6/86:00 amORD - BOI
1 stop6h 47mFrontier
Deal found 4/17$236
This Delta deal was found by Cheapflights users on 4/16. 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 6/51:04 pmJAC - ORD
1 stop7h 36mDelta
Mon 6/92:18 pmORD - JAC
1 stop7h 40mDelta
Deal found 4/16$237
This Alaska Airlines deal was found by Cheapflights users on 4/17. 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 5/18:59 pmBOI - ORD
1 stop8h 06mAlaska Airlines
Fri 5/29:00 amORD - BOI
1 stop8h 55mAlaska Airlines
Deal found 4/17$241

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 April 17, 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 - MDW

BOIMDW

Boise Air Term. Gowen Fld

Wed 7/2

10:24 am-5:40 pm

1 stop6h 16m

Chicago Midway

Mon 7/7

9:20 am-2:00 pm

1 stop5h 40m

$175

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 7/10

3:25 pm-9:54 pm

1 stop5h 29m

Chicago O'Hare Intl

Mon 7/14

6:00 am-12:31 pm

1 stop7h 31m

$175

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 9/11

2:11 pm-11:15 pm

1 stop8h 04m

Chicago O'Hare Intl

Tue 9/16

7:50 pm-11:06 pm

Nonstop4h 16m

$201

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Fri 6/13

7:27 pm-8:27 am

2 stops11h 00m

Chicago O'Hare Intl

Sun 6/15

7:40 am-11:59 am

1 stop6h 19m

$204

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 5/6

4:20 pm-11:59 pm

1 stop6h 39m

Chicago O'Hare Intl

Wed 5/7

3:44 pm-10:39 pm

1 stop7h 55m

$210

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Fri 9/5

1:39 pm-7:20 pm

Nonstop3h 41m

Chicago O'Hare Intl

Sun 9/7

10:45 am-12:35 pm

Nonstop3h 50m

$212

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Sun 6/8

3:35 pm-8:00 pm

Nonstop3h 25m

Chicago Midway

Sat 6/14

7:50 am-10:30 am

Nonstop3h 40m

$220

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Fri 5/9

8:03 am-6:01 pm

1 stop7h 58m

Chicago O'Hare Intl

Sun 5/11

6:00 am-10:50 am

1 stop6h 50m

$222

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 5/6

7:45 am-6:01 pm

1 stop9h 16m

Chicago O'Hare Intl

Thu 5/8

9:02 pm-11:21 am

1 stop15h 19m

$226

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Fri 5/9

11:20 pm-9:40 am

1 stop8h 20m

Chicago Midway

Sun 5/11

7:25 pm-11:15 pm

1 stop5h 50m

$226

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

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 $321). 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 April 17, 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.

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 April 17, 2025.

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

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 April 17, 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
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,887 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,280 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Hawaiian Airlines
7.9
Good
2,380 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,667 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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?

    $78 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on United Airlines and Hawaiian Airlines, with prices starting from $78 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, 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 $321). 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$127Average$297FlexibilityNo cancel feeOn-time65%
DeltaCheapest$189Average$384FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$196Average$543FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$217Average$353FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$258Average$416FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$268Average$589FlexibilityNo cancel feeOn-time69%

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