HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Idaho Falls

$142+ Cheap flights from Illinois to Idaho Falls (IDA)

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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IDA
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Idaho Falls 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 Illinois to Idaho Falls

Cheapest flights from Illinois to Idaho Falls
Explore the most affordable flight options available from Illinois to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

This United Airlines deal was found by Cheapflights users on 12/13. 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.
Tue 12/238:45 amORD - IDA
1 stop5h 45mUnited Airlines
Sat 12/272:30 pmIDA - ORD
1 stop7h 30mUnited Airlines
Deal found 12/13$561
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.
Wed 12/313:42 pmORD - IDA
1 stop8h 17mUnited Airlines
Sun 1/44:05 pmIDA - ORD
1 stop16h 39mUnited Airlines
Deal found 12/15$707
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Thu 12/182:45 pmSTL - IDA
1 stop7h 29mUnited Airlines
Sat 12/202:30 pmIDA - STL
1 stop6h 52mUnited Airlines
Deal found 12/14$746
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/231:40 pmORD - IDA
1 stop9h 41mAmerican Airlines
Sat 12/277:00 amIDA - ORD
2 stops12h 48mAmerican Airlines
Deal found 12/15$749
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Tue 12/308:00 pmORD - IDA
2 stops18h 30mUnited Airlines
Sat 1/34:05 pmIDA - ORD
1 stop16h 39mUnited Airlines
Deal found 12/14$751
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.
Tue 12/306:35 pmSTL - IDA
2 stops16h 23mUnited Airlines
Sat 1/36:40 amIDA - STL
1 stop14h 42mUnited Airlines
Deal found 12/15$810
This Delta deal was found by Cheapflights users on 12/14. 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.
Tue 12/2311:48 amMDW - IDA
2 stops7h 29mDelta
Sat 12/275:55 amIDA - MDW
2 stops10h 31mDelta
Deal found 12/14$1,080
This Delta deal was found by Cheapflights users on 12/14. 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.
Tue 12/309:29 amMDW - IDA
2 stops9h 48mDelta
Sat 1/36:57 pmIDA - MDW
2 stops13h 08mDelta
Deal found 12/14$1,990

Find flight deals from Illinois to Idaho Falls

Keep the following information in mind while searching for Illinois to Idaho Falls flight deals. Data was last updated December 16, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$312
(Kiwi.com)

One-way from

$142
(Kiwi.com)

Popular in

January

Cheapest in

March

Average price

$410
Provider with most accurate pricing for Chicago (CHI)-Idaho Falls Fanning Field flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Idaho Falls Fanning Field flights.
Search Deals
From Illinois to Idaho Falls Fanning Field
Search Deals
One-way flight from Illinois to Idaho Falls Fanning Field
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($141 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($34 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 Illinois to Idaho Falls 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 December 16, 2025.
Use the filters below to find and compare flights from Illinois to Idaho Falls that are best for you.

Fly from

Illinois

Fly to

Idaho Falls

Route

Depart

Return

Price

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Thu 1/22

3:35 pm-10:59 pm

1 stop8h 24m

Idaho Falls Fanning Field

Wed 1/28

9:00 am-5:10 pm

1 stop7h 10m

$312

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 1/30

2:50 pm-10:59 pm

1 stop9h 09m

Idaho Falls Fanning Field

Sat 1/31

6:58 pm-1:54 pm

1 stop17h 56m

$342

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Thu 1/22

9:00 am-10:59 pm

2 stops14h 59m

Idaho Falls Fanning Field

Wed 1/28

9:00 am-5:10 pm

1 stop7h 10m

$353

MolineIdaho Falls

MLI - IDA

MLIIDA

Moline Quad-City

Sat 1/10

8:46 am-3:31 pm

1 stop7h 45m

Idaho Falls Fanning Field

Tue 1/13

2:40 pm-8:34 pm

1 stop4h 54m

$359

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 1/24

3:35 pm-10:59 pm

1 stop8h 24m

Idaho Falls Fanning Field

Mon 1/26

6:58 pm-2:38 pm

1 stop18h 40m

$367

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Wed 2/4

2:50 pm-10:59 pm

1 stop9h 09m

Idaho Falls Fanning Field

Sat 2/7

9:00 am-1:54 pm

1 stop27h 54m

$368

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Mon 3/9

6:04 pm-10:20 pm

1 stop5h 16m

Idaho Falls Fanning Field

Fri 3/13

6:59 pm-8:52 am

2 stops12h 53m

$393

PeoriaIdaho Falls

PIA - IDA

PIAIDA

Greater Peoria

Sat 1/17

8:35 am-3:31 pm

1 stop7h 56m

Idaho Falls Fanning Field

Wed 1/21

2:40 pm-8:47 pm

1 stop5h 07m

$429

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 2/6

2:50 pm-6:18 pm

1 stop28h 28m

Idaho Falls Fanning Field

Mon 2/9

6:58 pm-1:54 pm

1 stop17h 56m

$442

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Mon 3/9

5:30 am-9:56 am

1 stop5h 26m

Idaho Falls Fanning Field

Fri 3/13

2:35 pm-8:55 pm

1 stop5h 20m

$451

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 32 results
1
2
3
4

Best time to book a flight from Illinois to Idaho Falls

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

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

Currently, October is the cheapest month in which you can book a flight from Illinois to Idaho Falls (average of $229). Flying from Illinois to Idaho Falls in February is currently the most expensive (average of $355). 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 IL to IDA?

Find hourly flight availability from Illinois to Idaho Falls. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 16, 2025.

When flying from Illinois to Idaho Falls, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 36% versus a flight in the morning.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Idaho Falls. 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 into for flights to Idaho Falls from 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 Idaho Falls from Illinois.

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

    Airlines like Hawaiian Airlines, Alaska Airlines, and United Airlines fly from Illinois to Idaho Falls in about 7h 45m. The time it takes to get you to your destination can typically vary by up to 1h 24m. Airlines will cover a distance of 1104 mi. This flight may include one or multiple stops.

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

    When deciding which route to take from Illinois to Idaho Falls consider Chicago O'Hare Intl - Idaho Falls Fanning Field, Lambert-St Louis - Idaho Falls Fanning Field or Greater Peoria - Idaho Falls Fanning Field as they are the most popular.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Illinois to Idaho Falls (average of $229). Flying from Illinois to Idaho Falls in February is currently the most expensive (average of $355). 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

Traveling to a place near Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Rexburg

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 Illinois to Idaho Falls

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Jackson flights
John F Kennedy Intl to Jackson flights
Seattle to Spokane flights
LaGuardia to Jackson flights
Seattle to Boise flights
Minneapolis to Spokane flights
Los Angeles to Jackson flights
O'Hare Intl to Jackson flights
San Francisco to Jackson flights
Boston to Jackson flights
O'Hare Intl to Boise flights
Dallas/Fort Worth to Boise flights
Los Angeles to Boise flights
Los Angeles to Spokane flights
Dulles Intl to Jackson flights
Dallas/Fort Worth to Jackson flights
Denver to Spokane flights
Denver to Boise flights
San Diego to Boise flights
Denver to Jackson flights
Burbank to Boise flights
Portland to Boise flights
O'Hare Intl to Spokane flights
San Francisco to Hailey flights
Newark to Hailey flights
Reagan-National to Jackson flights
Dallas/Fort Worth to Spokane flights
LaGuardia to Hailey flights
Santa Ana to Boise flights
Sky Harbor Intl to Boise flights
Minneapolis to Boise flights
Sky Harbor Intl to Spokane flights
John F Kennedy Intl to Hailey flights
Baltimore to Jackson flights
Charlotte to Jackson flights
San Francisco to Boise flights
Ontario to Boise flights
Atlanta to Jackson flights
Seattle to Jackson flights
San Francisco to Spokane flights
John F Kennedy Intl to Boise flights
Orlando to Jackson flights
Boston to Spokane flights
Boston to Boise flights
Los Angeles to Hailey flights
Santa Ana to Spokane flights
O'Hare Intl to Hailey flights
Newark to Boise flights
Cincinnati to Jackson flights
Seattle to Hailey flights

Top 2 airlines flying from Illinois to Idaho Falls

Discover the top 2 airlines that operate flights from Illinois to Idaho Falls. 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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$323Average$391FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$406Average$620FlexibilityNo 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.