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$105+ 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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
1 adult, Economy
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Cheap flight deals from Idaho to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Idaho (USID) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 20, 2024.

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 November 20, 2024.

This Mytrip deal was found by Cheapflights users on 11/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/911:57 amBOI - ORD
3 stops35h 37mSpirit Airlines
Thu 12/129:53 pmORD - BOI
1 stop14h 05mSpirit Airlines
Deal found 11/18$245
This Delta deal was found by Cheapflights users on 11/20. 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 12/611:10 amBOI - ORD
1 stop5h 52mDelta
Tue 12/177:10 pmORD - BOI
1 stop6h 33mDelta
Deal found 11/20$248
This Delta deal was found by Cheapflights users on 11/19. 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 12/41:25 pmGEG - ORD
1 stop6h 33mDelta
Wed 12/117:10 pmORD - GEG
1 stop6h 38mDelta
Deal found 11/19$263
This Delta deal was found by Cheapflights users on 11/19. 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.
Sat 12/712:52 pmGEG - MDW
1 stop7h 14mDelta
Tue 12/106:00 amMDW - GEG
1 stop7h 42mDelta
Deal found 11/19$264
This United Airlines deal was found by Cheapflights users on 11/19. 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 12/315:20 pmBOI - ORD
1 stop5h 31mUnited Airlines
Tue 1/712:45 pmORD - BOI
1 stop6h 17mUnited Airlines
Deal found 11/19$268
This eDestinos deal was found by Cheapflights users on 11/19. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/62:00 pmBOI - ORD
2 stops14h 30mMultiple Airlines
Mon 12/93:21 pmORD - BOI
1 stop24h 29mMultiple Airlines
Deal found 11/19$322
This Delta deal was found by Cheapflights users on 11/19. 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 12/115:35 amBOI - MDW
1 stop6h 56mDelta
Tue 12/172:15 pmMDW - BOI
2 stops11h 28mDelta
Deal found 11/19$328
This Southwest deal was found by Cheapflights users on 11/20. 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.
Tue 12/311:00 pmBOI - ORD
2 stops8h 35mSouthwest
Mon 1/64:00 pmORD - BOI
1 stop7h 55mSouthwest
Deal found 11/20$333
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Thu 12/125:15 amGEG - STL
1 stop5h 28mUnited Airlines
Tue 12/174:31 pmSTL - GEG
1 stop6h 26mUnited Airlines
Deal found 11/19$334
This Delta deal was found by Cheapflights users on 11/20. 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 12/116:55 pmIDA - ORD
2 stops12h 24mDelta
Fri 12/131:45 pmORD - IDA
2 stops10h 10mDelta
Deal found 11/20$334
This Delta deal was found by Cheapflights users on 11/19. 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 12/112:00 pmBOI - STL
2 stops9h 57mDelta
Sat 12/147:20 amSTL - BOI
1 stop5h 50mDelta
Deal found 11/19$350
This American Airlines deal was found by Cheapflights users on 11/18. 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 12/112:16 pmBOI - STL
1 stop8h 38mAmerican Airlines
Sat 12/147:20 amSTL - BOI
1 stop7h 11mAmerican Airlines
Deal found 11/18$358

Find flights from Idaho to Illinois within your budget

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 2,629,791 searches. Data last updated November 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Mon 12/9

11:57 am-12:34 am

3 stops35h 37m

Chicago O'Hare Intl

Thu 12/12

9:53 pm-10:58 am

1 stop14h 05m

$245

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Fri 12/6

11:10 am-6:02 pm

1 stop5h 52m

Chicago O'Hare Intl

Tue 12/17

7:10 pm-12:43 am

1 stop6h 33m

$248

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Wed 1/8

6:00 am-6:14 pm

2 stops10h 14m

Chicago Midway

Wed 1/22

10:19 am-9:07 pm

2 stops12h 48m

$248

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 12/4

1:25 pm-9:58 pm

1 stop6h 33m

Chicago O'Hare Intl

Wed 12/11

7:10 pm-11:48 pm

1 stop6h 38m

$263

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 12/31

5:20 pm-11:51 pm

1 stop5h 31m

Chicago O'Hare Intl

Mon 1/6

4:00 pm-9:33 pm

1 stop6h 33m

$268

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Thu 3/6

10:51 am-11:59 pm

1 stop11h 08m

Chicago O'Hare Intl

Tue 3/11

4:05 pm-8:41 pm

1 stop6h 36m

$283

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 1/30

2:40 pm-11:59 pm

1 stop8h 19m

Chicago O'Hare Intl

Mon 2/3

3:35 pm-4:19 pm

2 stops25h 44m

$292

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Fri 1/10

5:15 am-4:45 pm

2 stops10h 30m

Chicago O'Hare Intl

Mon 1/13

6:15 am-11:15 am

1 stop6h 00m

$313

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sat 1/4

11:57 am-5:30 am

1 stop16h 33m

Chicago O'Hare Intl

Sat 1/11

10:47 pm-9:49 am

1 stop12h 02m

$320

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Wed 12/11

5:35 am-1:31 pm

1 stop6h 56m

Chicago Midway

Tue 12/17

2:15 pm-12:43 am

2 stops11h 28m

$328

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

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.

Travel insights for flights from Idaho to Illinois

Get recent, data-driven insights about flights from Idaho to Illinois including ideal travel times, pricing trends, and more.

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

Currently, September is the cheapest month in which you can book a flight from Idaho to Illinois (average of $232). Flying from Idaho to Illinois in June is currently the most expensive (average of $308). 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 November 20, 2024.

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 November 20, 2024.

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 November 20, 2024.
Read through reviews of airlines operating flights from Idaho to Illinois, such as Spirit Airlines, Delta and American Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,014 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,461 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,756 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,171 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Allegiant Air
7.4
Good
850 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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?

    $105 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 Delta and United Airlines, with prices starting from $114 and $151, 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, September is the cheapest month in which you can book a flight from Idaho to Illinois (average of $232). Flying from Idaho to Illinois in June is currently the most expensive (average of $308). 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 2,629,791 searches. Data last updated November 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$114Average$208FlexibilityNo cancel feeOn-time65%
DeltaCheapest$185Average$346FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$215Average$338FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$228Average$544FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$291Average$597FlexibilityNo cancel feeOn-time69%
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