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$130+ Cheap flights from Idaho Falls (IDA) 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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from Idaho Falls to Illinois

Keep the following information in mind while searching for Idaho Falls to Illinois flight deals. Data was last updated October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$281
(Kiwi.com)

One-way from

$130
(Kiwi.com)

Popular in

March

Cheapest in

June

Average price

$426

Good round-trip deal

$436 or less

Good one-way deal

$240 or less
Provider with most accurate pricing for Idaho Falls Fanning Field-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-Chicago (CHI) flights.
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From Idaho Falls Fanning Field to Illinois
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One-way flight from Idaho Falls Fanning Field to Illinois
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Highest demand for flights based on searches. 17% potential increase in price ($114 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($35 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 Falls Fanning Field to Illinois.
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Price to beat on a one-way flight from Idaho Falls Fanning Field to Illinois.
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Find flight deals from Idaho Falls to Illinois

Cheapest flights from Idaho Falls to Illinois
Explore the most affordable flight options available from Idaho Falls to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/44:39 pmIDA - ORD
1 stop18h 03mMultiple Airlines
Mon 12/157:00 amORD - IDA
2 stops31h 36mMultiple Airlines
Deal found 10/30$251
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/271:52 pmIDA - STL
1 stop24h 16mMultiple Airlines
Wed 12/37:43 pmSTL - IDA
2 stops43h 53mMultiple Airlines
Deal found 10/30$270
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/271:52 pmIDA - STL
1 stop24h 16mMultiple Airlines
Thu 12/41:16 pmSTL - IDA
1 stop25h 00mMultiple Airlines
Deal found 10/30$273
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Wed 12/312:19 pmIDA - STL
1 stop22h 53mMultiple Airlines
Wed 12/107:43 pmSTL - IDA
2 stops43h 53mMultiple Airlines
Deal found 10/29$281
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/45:51 pmIDA - MDW
1 stop20h 01mMultiple Airlines
Mon 12/153:52 pmMDW - IDA
2 stops22h 44mMultiple Airlines
Deal found 10/30$287
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/44:39 pmIDA - ORD
1 stop18h 03mMultiple Airlines
Tue 12/169:06 pmORD - IDA
2 stops45h 36mMultiple Airlines
Deal found 10/30$303
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/710:56 pmIDA - STL
2 stops33h 11mMultiple Airlines
Thu 12/41:16 pmSTL - IDA
1 stop25h 00mMultiple Airlines
Deal found 10/30$335
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2610:51 pmIDA - STL
1 stop21h 18mMultiple Airlines
Wed 12/37:43 pmSTL - IDA
2 stops43h 53mMultiple Airlines
Deal found 10/30$340
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2610:51 pmIDA - STL
1 stop21h 18mMultiple Airlines
Thu 12/41:16 pmSTL - IDA
1 stop25h 00mMultiple Airlines
Deal found 10/30$342
This Delta deal was found by Cheapflights users on 10/29. 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 12/47:06 pmIDA - ORD
2 stops12h 33mDelta
Mon 12/87:20 amORD - IDA
1 stop6h 17mDelta
Deal found 10/29$356
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 12/46:05 amIDA - ORD
1 stop15h 25mAlaska Airlines
Mon 12/88:00 amORD - IDA
1 stop9h 27mAlaska Airlines
Deal found 10/29$366
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/35:07 pmIDA - STL
1 stop20h 20mAlaska Airlines
Wed 12/107:00 amSTL - IDA
1 stop10h 27mAlaska Airlines
Deal found 10/30$371

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho Falls 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 30, 2025.
Use the filters below to find and compare flights from Idaho Falls to Illinois that are best for you.

Fly from

Idaho Falls

Fly to

Illinois

Route

Depart

Return

Price

Idaho FallsChicago

IDA - MDW

IDAMDW

Idaho Falls Fanning Field

Thu 12/4

5:51 pm-2:52 pm

1 stop20h 01m

Chicago Midway

Mon 12/15

3:52 pm-1:36 pm

2 stops22h 44m

$287

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Thu 11/27

1:52 pm-3:08 pm

1 stop24h 16m

Lambert-St Louis

Thu 12/4

1:16 pm-7:26 pm

2 stops31h 10m

$302

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Wed 4/15

5:57 pm-11:57 pm

1 stop5h 00m

Chicago O'Hare Intl

Sun 4/19

5:15 am-9:28 am

1 stop5h 13m

$341

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Wed 1/7

4:19 pm-11:59 pm

1 stop6h 40m

Chicago O'Hare Intl

Mon 1/19

7:00 am-1:30 pm

1 stop7h 30m

$353

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Thu 12/4

6:05 am-10:30 pm

1 stop15h 25m

Chicago O'Hare Intl

Mon 12/8

8:00 am-4:27 pm

1 stop9h 27m

$366

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Wed 2/18

2:40 pm-10:53 pm

1 stop7h 13m

Chicago O'Hare Intl

Sat 2/21

7:10 am-1:30 pm

1 stop7h 20m

$366

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Tue 4/7

4:00 pm-11:55 pm

1 stop6h 55m

Lambert-St Louis

Wed 4/8

7:00 am-3:20 pm

1 stop9h 20m

$371

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

7:00 am-3:27 pm

1 stop7h 27m

Lambert-St Louis

Wed 12/10

7:00 am-1:27 pm

1 stop7h 27m

$371

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Tue 4/7

4:00 pm-11:55 pm

1 stop6h 55m

Lambert-St Louis

Wed 4/8

7:00 am-3:20 pm

1 stop9h 20m

$371

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

5:07 pm-2:27 pm

1 stop20h 20m

Lambert-St Louis

Wed 12/10

7:00 am-4:27 pm

1 stop10h 27m

$371

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 48 results
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Best time to book a flight from Idaho Falls to Illinois

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

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

Currently, June is the cheapest month in which you can book a flight from Idaho Falls to Illinois (average of $193). Flying from Idaho Falls to Illinois in July is currently the most expensive (average of $443). 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 IDA to IL?

Find hourly flight availability from Idaho Falls 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 30, 2025.

It’s typically best to fly out from Idaho Falls to Illinois in the evening. Doing so could potentially save you 42% on the flight price compared to flying in the morning, which is usually more expensive.

How much does it cost to fly round-trip from Idaho Falls to Illinois?

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 30, 2025.
Read through reviews of airlines operating flights from Idaho Falls to Illinois, such as Delta, United Airlines, and American Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,998 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,998 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
American Airlines
7.2
Good
11,035 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

Related info for your journey

Find useful and relevant information for your journey from Idaho Falls to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Idaho Falls to Illinois?

    Located just 3.8 mi from the city center, Idaho Falls Fanning Field (IDA) is the airport most travelers will use when flying to Illinois from Idaho Falls.

  • How long is the flight from Idaho Falls to Illinois?

    Airlines like United Airlines, Alaska Airlines, and Hawaiian Airlines fly from Idaho Falls to Illinois in about 5h. The time it takes to get you to your destination can typically vary by up to 10h 25m. The distance between Idaho Falls and Illinois is about 1225 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    $165 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 Delta and United Airlines, with prices starting from $226 and $226, respectively.

  • What are the most popular routes from Idaho Falls to Illinois?

    The most popular flight routes from Idaho Falls to Illinois are Idaho Falls Fanning Field - Chicago O'Hare Intl, Idaho Falls Fanning Field - Lambert-St Louis and Idaho Falls Fanning Field - Chicago Midway.

  • What are the cheapest flights from Idaho Falls to Illinois?

    Looking for the cheapest flight from Idaho Falls to Illinois? While on average our users pay $405, our data indicates the cheapest price to be $210. The most popular route (Idaho Falls Fanning Field - Chicago O'Hare Intl), is priced around $341.

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

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

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

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

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

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

    Currently, June is the cheapest month in which you can book a flight from Idaho Falls to Illinois (average of $193). Flying from Idaho Falls to Illinois in July is currently the most expensive (average of $443). 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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Top 2 airlines flying from Idaho Falls to Illinois

Discover the top 2 airlines that operate flights from Idaho Falls 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 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$311Average$533FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$323Average$403FlexibilityNo cancel feeOn-time71%

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