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$133+ 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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ORD
ene. 15 — ene. 221
jue. 1/15
jue. 1/22
1 adult, Economy
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Cheap 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 diciembre 16, 2025.

This United Airlines deal was found by Cheapflights users on 12/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/302:30 pmIDA - ORD
1 stop7h 30mUnited Airlines
sáb. 1/31:48 pmORD - IDA
1 stop8h 26mUnited Airlines
Deal found 12/15$441
This United Airlines deal was found by Cheapflights users on 12/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/314:05 pmIDA - ORD
1 stop6h 54mUnited Airlines
dom. 1/47:10 amORD - IDA
1 stop7h 20mUnited Airlines
Deal found 12/15$636
This United Airlines deal was found by Cheapflights users on 12/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/202:30 pmIDA - ORD
1 stop5h 49mUnited Airlines
mié. 12/317:10 amORD - IDA
1 stop7h 20mUnited Airlines
Deal found 12/16$676
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/199:20 pmIDA - ORD
2 stops22h 40mMultiple Airlines
dom. 12/2110:49 pmORD - IDA
1 stop16h 31mMultiple Airlines
Deal found 12/15$723
This United Airlines deal was found by Cheapflights users on 12/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/312:30 pmIDA - STL
1 stop6h 52mUnited Airlines
dom. 1/42:45 pmSTL - IDA
1 stop9h 14mUnited Airlines
Deal found 12/16$753
This United Airlines deal was found by Cheapflights users on 12/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/194:05 pmIDA - ORD
1 stop5h 55mUnited Airlines
dom. 12/213:42 pmORD - IDA
1 stop6h 32mUnited Airlines
Deal found 12/15$780
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/311:16 pmIDA - STL
2 stops18h 19mAmerican Airlines
dom. 1/42:43 pmSTL - IDA
1 stop8h 38mAmerican Airlines
Deal found 12/16$788
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/201:16 pmIDA - ORD
1 stop8h 04mAmerican Airlines
mié. 12/315:15 amORD - IDA
1 stop8h 31mAmerican Airlines
Deal found 12/16$876
This Delta deal was found by Cheapflights users on 12/16. 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.
sáb. 12/205:55 amIDA - ORD
2 stops12h 00mDelta
mié. 12/3110:46 amORD - IDA
2 stops13h 06mDelta
Deal found 12/16$1,269

Find 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 diciembre 16, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$331
(United Airlines)

One-way from

$133
(Kiwi.com)

Popular in

March

Cheapest in

June

Average price

$553
Provider with most accurate pricing for Idaho Falls Fanning Field-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-Chicago (CHI) flights.
Search Deals
From Idaho Falls Fanning Field to Illinois
Search Deals
One-way flight from Idaho Falls Fanning Field to Illinois
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($127 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 diciembre 16, 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 - ORD

IDAORD

Idaho Falls Fanning Field

lun. 1/12

4:19 pm-11:59 pm

1 stop6h 40m

Chicago O'Hare Intl

lun. 1/19

7:00 am-1:30 pm

1 stop7h 30m

$331

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 2/6

2:40 pm-11:59 pm

1 stop8h 19m

Chicago O'Hare Intl

dom. 2/8

7:00 am-1:30 pm

1 stop7h 30m

$331

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

sáb. 2/14

8:00 am-4:33 pm

1 stop7h 33m

Chicago O'Hare Intl

mié. 2/18

3:54 pm-11:36 pm

1 stop8h 42m

$351

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 4/10

5:30 pm-11:57 pm

1 stop5h 27m

Chicago O'Hare Intl

dom. 4/19

7:00 am-1:24 pm

1 stop7h 24m

$359

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

lun. 1/26

6:58 pm-2:38 pm

1 stop18h 40m

Chicago O'Hare Intl

vie. 1/30

3:44 pm-6:18 pm

2 stops27h 34m

$372

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

lun. 1/26

2:07 pm-11:44 pm

1 stop8h 37m

Chicago O'Hare Intl

vie. 1/30

6:54 am-1:37 pm

1 stop7h 43m

$378

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 2/6

9:20 pm-2:17 pm

2 stops15h 57m

Chicago O'Hare Intl

dom. 2/8

9:38 pm-2:19 pm

1 stop17h 41m

$383

Idaho FallsMoline

IDA - MLI

IDAMLI

Idaho Falls Fanning Field

sáb. 2/14

2:40 pm-9:14 pm

1 stop5h 34m

Moline Quad-City

mié. 2/18

8:49 am-1:30 pm

1 stop5h 41m

$394

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

lun. 1/12

6:58 pm-2:38 pm

1 stop18h 40m

Chicago O'Hare Intl

lun. 1/19

2:06 pm-6:18 pm

2 stops29h 12m

$402

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

lun. 1/5

4:05 pm-11:00 pm

1 stop5h 55m

Chicago O'Hare Intl

vie. 1/9

8:45 am-3:31 pm

1 stop7h 46m

$431

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 31 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 $447). 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 diciembre 16, 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 diciembre 16, 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
8,008 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,008 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,092 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,049 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 and Alaska Airlines fly from Idaho Falls to Illinois in about 6h 40m. The time it takes to get you to your destination can typically vary by up to 53m. 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 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 - Chicago Midway and Idaho Falls Fanning Field - Moline Quad-City.

  • 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 $447). 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 Falls to Illinois

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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 diciembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$311Average$490FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$323Average$390FlexibilityNo cancel feeOn-time71%

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