HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$116+ 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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ORD
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Idaho Falls to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 15, 2025.

Round-trip from

$315
(Kiwi.com)

One-way from

$116
(Kiwi.com)

Popular in

March

Cheapest in

June

Average price

$371

Good round-trip deal

$393 or less

Good one-way deal

$297 or less
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. 18% potential increase in price ($118 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Idaho Falls Fanning Field to Illinois.
Search Deals
Price to beat on a one-way flight from Idaho Falls Fanning Field to Illinois.
Search Deals

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 September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Mon 10/137:40 pmIDA - ORD
2 stops27h 13mMultiple Airlines
Mon 10/206:35 amORD - IDA
1 stop7h 14mMultiple Airlines
Deal found 9/13$315
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/155:56 pmIDA - ORD
1 stop5h 03mUnited Airlines
Sun 10/195:01 amORD - IDA
1 stop5h 47mUnited Airlines
Deal found 9/14$331
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Mon 11/38:52 pmIDA - ORD
1 stop7h 53mMultiple Airlines
Mon 11/106:00 amORD - IDA
2 stops14h 06mMultiple Airlines
Deal found 9/13$354
This American Airlines deal was found by Cheapflights users on 9/14. 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 10/2912:55 pmIDA - ORD
Nonstop3h 17mAmerican Airlines
Wed 11/55:18 amORD - IDA
1 stop9h 10mAmerican Airlines
Deal found 9/14$366
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 10/244:15 pmIDA - ORD
1 stop13h 09mAlaska Airlines
Mon 10/276:00 amORD - IDA
1 stop10h 13mAlaska Airlines
Deal found 9/14$369
This American Airlines deal was found by Cheapflights users on 9/13. 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 10/241:11 pmIDA - ORD
Nonstop3h 17mAmerican Airlines
Mon 10/279:45 amORD - IDA
Nonstop3h 40mAmerican Airlines
Deal found 9/13$371
This Alaska Airlines deal was found by Cheapflights users on 9/12. 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.
Tue 11/43:50 pmIDA - ORD
1 stop7h 34mAlaska Airlines
Fri 11/710:00 amORD - IDA
1 stop30h 13mAlaska Airlines
Deal found 9/12$373
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 10/1610:13 pmIDA - ORD
2 stops18h 44mMultiple Airlines
Mon 10/206:35 amORD - IDA
1 stop7h 14mMultiple Airlines
Deal found 9/12$374
This Delta deal was found by Cheapflights users on 9/14. 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 11/71:15 pmIDA - ORD
1 stop7h 28mDelta
Sat 11/157:33 amORD - IDA
1 stop6h 06mDelta
Deal found 9/14$376
This Hawaiian Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 11/86:05 amIDA - STL
1 stop8h 13mHawaiian Airlines
Thu 11/137:00 amSTL - IDA
1 stop9h 13mHawaiian Airlines
Deal found 9/14$379
This United Airlines deal was found by Cheapflights users on 9/13. 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.
Sat 11/810:50 amIDA - STL
1 stop4h 38mUnited Airlines
Thu 11/139:00 amSTL - IDA
1 stop7h 16mUnited Airlines
Deal found 9/13$380
This American Airlines deal was found by Cheapflights users on 9/13. 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.
Tue 10/2812:55 pmIDA - ORD
Nonstop3h 17mAmerican Airlines
Fri 10/315:00 amORD - IDA
1 stop8h 41mAmerican Airlines
Deal found 9/13$381

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 September 15, 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

Thu 11/13

4:15 pm-11:59 pm

1 stop6h 44m

Chicago O'Hare Intl

Mon 11/17

3:55 pm-10:52 pm

1 stop7h 57m

$331

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Mon 10/13

7:40 pm-8:48 pm

1 stop24h 08m

Chicago O'Hare Intl

Mon 10/20

6:35 am-12:49 pm

1 stop7h 14m

$349

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Tue 10/28

6:05 am-4:30 pm

1 stop9h 25m

Chicago O'Hare Intl

Fri 10/31

6:00 am-3:13 pm

1 stop10h 13m

$369

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Tue 11/4

3:50 pm-12:24 am

1 stop7h 34m

Chicago O'Hare Intl

Fri 11/7

10:00 am-3:13 pm

1 stop30h 13m

$373

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Fri 11/7

1:15 pm-9:43 pm

1 stop7h 28m

Chicago O'Hare Intl

Sat 11/15

7:33 am-12:39 pm

1 stop6h 06m

$376

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Thu 2/19

4:00 pm-11:59 pm

1 stop6h 59m

Chicago O'Hare Intl

Tue 2/24

2:00 pm-10:38 pm

1 stop9h 38m

$377

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 10/15

4:15 pm-12:03 am

1 stop6h 48m

Lambert-St Louis

Sat 10/18

6:33 am-3:38 pm

1 stop10h 05m

$379

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Sat 11/8

6:05 am-3:18 pm

1 stop8h 13m

Lambert-St Louis

Thu 11/13

4:14 pm-11:59 pm

1 stop8h 45m

$379

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Sat 11/8

10:50 am-4:28 pm

1 stop4h 38m

Lambert-St Louis

Thu 11/13

9:00 am-3:16 pm

1 stop7h 16m

$380

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Tue 10/28

12:55 pm-5:12 pm

Nonstop3h 17m

Chicago O'Hare Intl

Fri 10/31

5:00 am-12:41 pm

1 stop8h 41m

$381

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 43 results
1
2
3
...
5

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, August is the cheapest month in which you can book a flight from Idaho Falls to Illinois (average of $245). Flying from Idaho Falls 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 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 September 15, 2025.

When flying from Idaho Falls to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Idaho Falls to Illinois

Explore weekly flight availability from Idaho Falls 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 September 15, 2025.

The most flights from IDA to USIL are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

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 September 15, 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
8.0
Very good
7,956 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,956 reviews
Delta
8.0
Very good
7,956 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,931 reviews
Delta
8.0
Very good
7,956 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,956 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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, Hawaiian Airlines, and Alaska Airlines fly from Idaho Falls to Illinois in about 6h 44m. The time it takes to get you to your destination can typically vary by up to 2h 41m. 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 - Lambert-St Louis.

  • 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 $377, our data indicates the cheapest price to be $260. The most popular route (Idaho Falls Fanning Field - Chicago O'Hare Intl), is priced around $331.

  • 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, August is the cheapest month in which you can book a flight from Idaho Falls to Illinois (average of $245). Flying from Idaho Falls 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho Falls to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Boise to Seattle flights
Boise to Las Vegas flights
Boise to Sky Harbor Intl flights
Spokane to Seattle flights
Spokane to Sky Harbor Intl flights
Boise to Los Angeles flights
Boise to Dallas/Fort Worth flights
Boise to Denver flights
Boise to O'Hare Intl flights
Spokane to Los Angeles flights
Spokane to Denver flights
Boise to San Diego flights
Boise to Portland flights
Spokane to Las Vegas flights
Boise to Minneapolis flights
Spokane to Dallas/Fort Worth flights
Boise to John F Kennedy Intl flights
Boise to Burbank flights
Boise to Santa Ana flights
Boise to Honolulu flights
Boise to Orlando flights
Boise to San Francisco flights
Spokane to Salt Lake City flights
Boise to Atlanta flights
Spokane to Portland flights
Spokane to Boise flights
Boise to Spokane flights
Boise to Lihue flights
Spokane to Minneapolis flights
Spokane to Sacramento flights
Spokane to Hobby flights
Spokane to O'Hare Intl flights
Boise to Sacramento flights
Spokane to John F Kennedy Intl flights
Spokane to Honolulu flights
Spokane to San Diego flights
Boise to Hobby flights
Spokane to Orlando flights
Boise to LaGuardia flights
Boise to Newark flights
Spokane to Kahului flights
Idaho Falls to Dallas/Fort Worth flights
Idaho Falls to Seattle flights
Boise to Kahului flights
Spokane to St. Louis flights
Boise to Boston flights
Boise to Ontario flights
Idaho Falls to Sky Harbor Intl flights
Spokane to Newark flights
Spokane to LaGuardia flights

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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$323Average$401FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$361Average$490FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.