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Idaho Falls

$137+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IDA
May 1 — May 81
Fri 5/1
Fri 5/8
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 April 1, 2026.

This American Airlines deal was found by Cheapflights users on 3/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:40 am
ORD
-
IDA
Nonstop3h 40m
American Airlines
Sat 10/241:43 pm
IDA
-
ORD
Nonstop3h 17m
American Airlines
Deal found 3/29$309
This Alaska Airlines deal was found by Cheapflights users on 3/30. 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 10/213:09 pm
ORD
-
IDA
1 stop8h 30m
Alaska Airlines
Sat 10/244:00 pm
IDA
-
ORD
1 stop6h 41m
Alaska Airlines
Deal found 3/30$329
This American Airlines deal was found by Cheapflights users on 3/28. 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 8/226:00 am
ORD
-
IDA
1 stop8h 44m
American Airlines
Sat 8/2912:46 pm
IDA
-
ORD
Nonstop3h 25m
American Airlines
Deal found 3/28$349
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:45 pm
STL
-
IDA
1 stop4h 55m
Delta
Sat 4/186:58 pm
IDA
-
STL
2 stops12h 32m
Delta
Deal found 3/30$354
This Delta deal was found by Cheapflights users on 3/28. 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 5/56:45 pm
STL
-
IDA
1 stop4h 55m
Delta
Fri 5/86:54 pm
IDA
-
STL
2 stops13h 55m
Delta
Deal found 3/28$359
This Kiwi.com deal was found by Cheapflights users on 3/28. 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.
Sun 5/319:21 pm
STL
-
IDA
1 stop13h 49m
Multiple Airlines
Fri 6/510:56 pm
IDA
-
STL
2 stops19h 27m
Multiple Airlines
Deal found 3/28$360
This American Airlines deal was found by Cheapflights users on 3/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:55 am
ORD
-
IDA
Nonstop3h 15m
American Airlines
Sun 9/612:46 pm
IDA
-
ORD
Nonstop3h 25m
American Airlines
Deal found 3/29$369
This Expedia deal was found by Cheapflights users on 3/28. 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.
Mon 6/15:33 pm
STL
-
IDA
1 stop20h 44m
Alaska Airlines
Thu 6/44:03 pm
IDA
-
STL
1 stop23h 34m
Alaska Airlines
Deal found 3/28$369
This Travelocity deal was found by Cheapflights users on 3/29. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/198:42 pm
ORD
-
IDA
1 stop19h 47m
Alaska Airlines
Sat 10/244:00 pm
IDA
-
ORD
1 stop6h 41m
Alaska Airlines
Deal found 3/29$374
This United Airlines deal was found by Cheapflights users on 3/28. 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 5/58:46 am
STL
-
IDA
1 stop5h 39m
United Airlines
Fri 5/82:31 pm
IDA
-
STL
1 stop5h 12m
United Airlines
Deal found 3/28$382
This Delta deal was found by Cheapflights users on 3/29. 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.
Wed 7/157:45 am
ORD
-
IDA
1 stop7h 56m
Delta
Sat 7/256:00 am
IDA
-
ORD
1 stop4h 59m
Delta
Deal found 3/29$384
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/147:35 am
ORD
-
IDA
1 stop5h 51m
Delta
Sat 4/185:47 am
IDA
-
ORD
1 stop5h 04m
Delta
Deal found 3/30$389

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 April 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$329
(Delta)

One-way from

$137
(Kiwi.com)

Popular in

January

Cheapest in

April

Average price

$342

Good round-trip deal

$475 or less
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. 16% potential increase in price ($83 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Idaho Falls Fanning Field.
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 April 1, 2026.
Use the filters below to find and compare flights from Illinois to Idaho Falls that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 4/14

6:45 pm-10:40 pm

1 stop4h 55m

Idaho Falls Fanning Field

Sat 4/18

6:58 pm-8:30 am

2 stops12h 32m

$354

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Tue 4/14

7:35 am-12:26 pm

1 stop5h 51m

Idaho Falls Fanning Field

Sat 4/18

6:58 pm-8:37 am

2 stops12h 39m

$394

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Wed 6/24

5:00 am-9:50 am

1 stop5h 50m

Idaho Falls Fanning Field

Wed 6/24

4:10 pm-12:44 am

1 stop7h 34m

$401

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 4/24

3:00 pm-11:39 pm

1 stop9h 39m

Idaho Falls Fanning Field

Fri 5/1

1:43 pm-10:00 pm

1 stop7h 17m

$419

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sun 5/31

5:10 am-9:50 am

1 stop5h 40m

Idaho Falls Fanning Field

Tue 6/2

5:54 pm-11:57 pm

1 stop5h 03m

$429

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sun 5/31

5:10 am-9:50 am

1 stop5h 40m

Idaho Falls Fanning Field

Wed 6/3

4:10 pm-11:57 pm

1 stop6h 47m

$429

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 4/11

4:10 pm-9:04 pm

1 stop5h 54m

Idaho Falls Fanning Field

Wed 4/15

5:20 pm-12:30 am

1 stop6h 10m

$431

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 5/7

6:00 am-2:34 pm

2 stops9h 34m

Idaho Falls Fanning Field

Sun 5/10

6:00 am-5:16 pm

2 stops10h 16m

$439

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Wed 6/10

5:00 am-9:50 am

1 stop5h 50m

Idaho Falls Fanning Field

Wed 6/17

4:10 pm-12:44 am

1 stop7h 34m

$455

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Mon 4/13

6:00 am-4:19 pm

1 stop11h 19m

Idaho Falls Fanning Field

Fri 4/17

4:59 pm-3:13 pm

1 stop21h 14m

$464

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 53 resultsSorted by cheapest first
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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.

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

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 Delta, United Airlines, and American Airlines fly from Illinois to Idaho Falls in about 4h 55m. The time it takes to get you to your destination can typically vary by up to 4h 44m. Airlines will cover a distance of 1171 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 Moline Quad-City - Idaho Falls Fanning Field as they are the most popular.

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

    Looking for the cheapest flight from Illinois to Idaho Falls? While on average our users pay $501, our data indicates the cheapest price to be $321. The most popular route (Chicago O'Hare Intl - Idaho Falls Fanning Field), is priced around $329.

  • 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

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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 April 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$323Average$436FlexibilityNo cancel feeOn-time71%

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