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$118+ 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ORD
ago. 4 — ago. 111
lun. 8/4
lun. 8/11
1 adult, Economy
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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 julio 30, 2025.

Round-trip from

$236
(Delta)

One-way from

$118
(Alaska Airlines)

Popular in

March

Cheapest in

June

Average price

$606

Good round-trip deal

$340 or less

Good one-way deal

$235 or less
From Idaho Falls Fanning Field to Illinois
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One-way flight from Idaho Falls Fanning Field to Illinois
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Highest demand for flights based on searches. 19% potential increase in price ($124 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Idaho Falls Fanning Field to Illinois.
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Price to beat on a one-way flight from Idaho Falls Fanning Field to Illinois.
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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 julio 30, 2025.

This Delta deal was found by Cheapflights users on 7/29. 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.
jue. 8/213:00 pmIDA - ORD
1 stop6h 04mDelta
lun. 8/256:25 pmORD - IDA
1 stop5h 02mDelta
Deal found 7/29$236
This Hawaiian Airlines deal was found by Cheapflights users on 7/29. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/306:13 amIDA - STL
1 stop7h 26mHawaiian Airlines
sáb. 10/43:57 pmSTL - IDA
1 stop7h 41mHawaiian Airlines
Deal found 7/29$298
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/203:57 pmIDA - ORD
1 stop7h 06mHawaiian Airlines
mar. 9/308:00 amORD - IDA
1 stop8h 20mHawaiian Airlines
Deal found 7/28$302
This American Airlines deal was found by Cheapflights users on 7/29. 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.
vie. 10/241:11 pmIDA - ORD
Nonstop3h 17mAmerican Airlines
lun. 10/279:45 amORD - IDA
Nonstop3h 40mAmerican Airlines
Deal found 7/29$311
This Mytrip deal was found by Cheapflights users on 7/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/1210:55 pmIDA - ORD
1 stop11h 56mMultiple Airlines
dom. 9/147:06 pmORD - IDA
2 stops20h 43mMultiple Airlines
Deal found 7/28$324
This Delta deal was found by Cheapflights users on 7/30. 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.
mar. 9/306:51 pmIDA - STL
2 stops12h 23mDelta
sáb. 10/45:30 pmSTL - IDA
1 stop5h 55mDelta
Deal found 7/30$332
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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.
sáb. 9/136:13 amIDA - ORD
1 stop16h 50mAlaska Airlines
sáb. 9/206:20 amORD - IDA
1 stop10h 00mAlaska Airlines
Deal found 7/30$376
This United Airlines deal was found by Cheapflights users on 7/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/24:00 pmIDA - STL
1 stop6h 53mUnited Airlines
mar. 9/99:00 amSTL - IDA
1 stop7h 11mUnited Airlines
Deal found 7/30$435
This Delta deal was found by Cheapflights users on 7/30. 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.
sáb. 9/206:00 amIDA - MDW
2 stops10h 35mDelta
mar. 9/301:43 pmMDW - IDA
2 stops9h 42mDelta
Deal found 7/30$484
This American Airlines deal was found by Cheapflights users on 7/28. 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.
sáb. 8/21:47 pmIDA - STL
1 stop5h 44mAmerican Airlines
sáb. 8/96:00 amSTL - IDA
1 stop8h 00mAmerican Airlines
Deal found 7/28$716

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 julio 30, 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

jue. 8/21

3:00 pm-10:04 pm

1 stop6h 04m

Chicago O'Hare Intl

lun. 8/25

6:25 pm-10:27 pm

1 stop5h 02m

$236

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mar. 9/30

6:13 am-2:39 pm

1 stop7h 26m

Lambert-St Louis

sáb. 10/4

3:57 pm-10:38 pm

1 stop7h 41m

$298

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

sáb. 9/20

3:57 pm-12:03 am

1 stop7h 06m

Chicago O'Hare Intl

mar. 9/30

8:00 am-3:20 pm

1 stop8h 20m

$302

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 10/24

1:11 pm-5:28 pm

Nonstop3h 17m

Chicago O'Hare Intl

lun. 10/27

9:45 am-12:25 pm

Nonstop3h 40m

$311

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 9/12

10:55 pm-11:51 am

1 stop11h 56m

Chicago O'Hare Intl

dom. 9/14

7:06 pm-2:49 pm

2 stops20h 43m

$324

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mar. 9/30

6:51 pm-8:14 am

2 stops12h 23m

Lambert-St Louis

sáb. 10/4

5:30 pm-10:25 pm

1 stop5h 55m

$332

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

sáb. 9/13

6:13 am-10:07 pm

1 stop14h 54m

Chicago O'Hare Intl

sáb. 9/20

8:00 am-3:20 pm

1 stop8h 20m

$376

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mar. 9/2

4:00 pm-11:53 pm

1 stop6h 53m

Lambert-St Louis

mar. 9/9

9:00 am-3:11 pm

1 stop7h 11m

$435

Idaho FallsChicago

IDA - MDW

IDAMDW

Idaho Falls Fanning Field

sáb. 9/20

6:00 am-5:35 pm

2 stops10h 35m

Chicago Midway

mar. 9/30

1:43 pm-10:25 pm

2 stops9h 42m

$484

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

sáb. 8/2

1:47 pm-8:31 pm

1 stop5h 44m

Lambert-St Louis

sáb. 8/9

6:00 am-1:00 pm

1 stop8h 00m

$716

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 20 results
1
2

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 julio 30, 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.

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 julio 30, 2025.
Read through reviews of airlines operating flights from Idaho Falls to Illinois, such as Alaska Airlines, Delta, and Hawaiian Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.

  • What are the cheapest airlines to fly from Idaho Falls to Illinois one-way?

    $118 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on Delta and American Airlines, with prices starting from $119 and $150, respectively.

  • 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 $370, our data indicates the cheapest price to be $193. The most popular route (Idaho Falls Fanning Field - Chicago O'Hare Intl), is priced around $237.

  • 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.

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Alternative routes for Idaho Falls to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 julio 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$323Average$371FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$361Average$645FlexibilityNo cancel feeOn-time69%

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