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Idaho Falls

$135+ 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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IDA
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
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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 January 28, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/27. 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.
Sat 2/282:47 pm
STL
-
IDA
1 stop9h 49m
Alaska Airlines
Sat 3/75:20 pm
IDA
-
STL
1 stop19h 03m
Alaska Airlines
Deal found 1/27$303
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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.
Sat 8/223:09 pm
ORD
-
IDA
1 stop8h 30m
Alaska Airlines
Sat 8/294:03 pm
IDA
-
ORD
1 stop6h 56m
Alaska Airlines
Deal found 1/27$325
This United Airlines deal was found by Cheapflights users on 1/27. 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 6/205:15 am
STL
-
IDA
1 stop5h 40m
United Airlines
Sat 6/275:57 pm
IDA
-
STL
1 stop4h 46m
United Airlines
Deal found 1/27$329
This American Airlines deal was found by Cheapflights users on 1/27. 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 6/3010:36 am
ORD
-
IDA
Nonstop3h 37m
American Airlines
Tue 7/712:41 pm
IDA
-
ORD
Nonstop3h 29m
American Airlines
Deal found 1/27$335
This American Airlines deal was found by Cheapflights users on 1/26. 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.
Sat 8/221:26 pm
ORD
-
IDA
1 stop8h 53m
American Airlines
Sat 8/2912:46 pm
IDA
-
ORD
Nonstop3h 25m
American Airlines
Deal found 1/26$340
This Delta deal was found by Cheapflights users on 1/26. 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.
Mon 3/21:20 pm
ORD
-
IDA
1 stop5h 29m
Delta
Thu 3/121:10 pm
IDA
-
ORD
1 stop7h 24m
Delta
Deal found 1/26$345
This American Airlines deal was found by Cheapflights users on 1/26. 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.
Thu 10/226:02 am
STL
-
IDA
1 stop7h 18m
American Airlines
Mon 10/261:43 pm
IDA
-
STL
1 stop5h 25m
American Airlines
Deal found 1/26$360
This Delta deal was found by Cheapflights users on 1/27. 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 8/221:35 pm
ORD
-
IDA
2 stops9h 39m
Delta
Sat 8/293:04 pm
IDA
-
ORD
1 stop5h 54m
Delta
Deal found 1/27$365
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 5/86:00 am
ORD
-
IDA
2 stops10h 27m
Multiple Airlines
Mon 5/1110:21 pm
IDA
-
ORD
1 stop7h 26m
Multiple Airlines
Deal found 1/26$375
This Expedia deal was found by Cheapflights users on 1/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/285:29 pm
ORD
-
IDA
1 stop24h 14m
Alaska Airlines
Sun 3/295:59 pm
IDA
-
ORD
1 stop11h 40m
Alaska Airlines
Deal found 1/26$390
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 3/37:00 am
STL
-
IDA
1 stop10h 43m
Alaska Airlines
Wed 3/45:20 pm
IDA
-
STL
1 stop19h 31m
Alaska Airlines
Deal found 1/27$393
This American Airlines deal was found by Cheapflights users on 1/26. 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 7/216:00 am
STL
-
IDA
1 stop8h 13m
American Airlines
Wed 7/2212:41 pm
IDA
-
STL
1 stop6h 45m
American Airlines
Deal found 1/26$401

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 January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$303
(Alaska Airlines)

One-way from

$135
(Alaska Airlines)

Popular in

January

Cheapest in

April

Average price

$672
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. 17% potential increase in price ($94 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 28, 2026.
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

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sun 3/1

7:00 am-4:43 pm

1 stop10h 43m

Idaho Falls Fanning Field

Sat 3/7

5:20 pm-1:23 pm

1 stop19h 03m

$303

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sat 2/28

2:47 pm-11:36 pm

1 stop9h 49m

Idaho Falls Fanning Field

Sat 3/7

5:20 pm-1:23 pm

1 stop19h 03m

$303

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sat 6/20

5:15 am-9:55 am

1 stop5h 40m

Idaho Falls Fanning Field

Sat 6/27

5:57 pm-11:43 pm

1 stop4h 46m

$329

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Tue 6/30

10:36 am-1:13 pm

Nonstop3h 37m

Idaho Falls Fanning Field

Tue 7/7

12:41 pm-5:10 pm

Nonstop3h 29m

$335

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Mon 3/2

1:20 pm-5:49 pm

1 stop5h 29m

Idaho Falls Fanning Field

Thu 3/12

1:10 pm-9:34 pm

1 stop7h 24m

$345

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 5/8

6:00 am-3:27 pm

2 stops10h 27m

Idaho Falls Fanning Field

Mon 5/11

10:21 pm-6:47 am

1 stop7h 26m

$375

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Mon 3/2

1:20 pm-5:49 pm

1 stop5h 29m

Idaho Falls Fanning Field

Wed 3/11

1:10 pm-9:34 pm

1 stop7h 24m

$385

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 5/8

6:00 am-3:29 pm

1 stop10h 29m

Idaho Falls Fanning Field

Mon 5/11

4:06 pm-11:59 pm

1 stop6h 53m

$385

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 2/28

5:29 pm-4:43 pm

1 stop24h 14m

Idaho Falls Fanning Field

Sun 3/29

5:59 pm-6:39 am

1 stop11h 40m

$390

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

7:00 am-4:43 pm

1 stop10h 43m

Idaho Falls Fanning Field

Wed 3/4

5:20 pm-1:51 pm

1 stop19h 31m

$393

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 46 results
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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 November 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.

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 Alaska Airlines, United Airlines, and American Airlines fly from Illinois to Idaho Falls in about 3h 37m. The time it takes to get you to your destination can typically vary by up to 7h 06m. Airlines will cover a distance of 1225 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 Chicago Midway - 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 November 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

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Alternative routes for Illinois to Idaho Falls

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Illinois to Idaho Falls

Discover the top airline 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 January 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$323Average$391FlexibilityNo cancel feeOn-time71%

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