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$123+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ORD
May 24 — May 311
Sat 5/24
Sat 5/31
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 May 19, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$247
(Delta)

One-way from

$180
(Delta)

Popular in

March

Cheapest in

June

Average price

$399

Good round-trip deal

$323 or less

Good one-way deal

$162 or less
Provider with most accurate pricing for Idaho Falls Fanning Field-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-Chicago (CHI) flights.
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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. 21% potential increase in price ($140 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 19, 2025.

This Delta deal was found by Cheapflights users on 5/19. 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 8/206:00 amIDA - ORD
1 stop4h 58mDelta
Mon 8/257:35 amORD - IDA
1 stop7h 44mDelta
Deal found 5/19$247
This Delta deal was found by Cheapflights users on 5/18. 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 8/206:00 amIDA - MDW
2 stops10h 47mDelta
Sat 8/231:43 pmMDW - IDA
2 stops9h 44mDelta
Deal found 5/18$268
This Mytrip deal was found by Cheapflights users on 5/19. 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.
Mon 6/166:35 pmIDA - ORD
1 stop10h 37mMultiple Airlines
Thu 6/1910:15 pmORD - IDA
2 stops18h 25mMultiple Airlines
Deal found 5/19$269
This Alaska Airlines deal was found by Cheapflights users on 5/18. 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 8/226:13 amIDA - ORD
1 stop23h 50mAlaska Airlines
Mon 8/253:20 pmORD - IDA
1 stop8h 19mAlaska Airlines
Deal found 5/18$322
This American Airlines deal was found by Cheapflights users on 5/19. 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 8/612:46 pmIDA - ORD
Nonstop3h 25mAmerican Airlines
Wed 8/139:55 amORD - IDA
Nonstop3h 15mAmerican Airlines
Deal found 5/19$331
This United Airlines deal was found by Cheapflights users on 5/19. 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 8/66:03 pmIDA - ORD
1 stop5h 27mUnited Airlines
Wed 8/135:00 amORD - IDA
1 stop5h 44mUnited Airlines
Deal found 5/19$351
This United Airlines deal was found by Cheapflights users on 5/18. 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 6/145:00 amIDA - STL
2 stops9h 30mUnited Airlines
Tue 6/175:20 amSTL - IDA
1 stop5h 24mUnited Airlines
Deal found 5/18$412
This Delta deal was found by Cheapflights users on 5/19. 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 6/146:00 amIDA - STL
2 stops7h 36mDelta
Tue 6/177:15 pmSTL - IDA
1 stop4h 40mDelta
Deal found 5/19$444
This American Airlines deal was found by Cheapflights users on 5/19. 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 6/147:00 amIDA - STL
1 stop6h 28mAmerican Airlines
Tue 6/175:37 amSTL - IDA
1 stop8h 44mAmerican Airlines
Deal found 5/19$459
This Alaska Airlines deal was found by Cheapflights users on 5/18. 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.
Mon 6/24:20 pmIDA - STL
1 stop6h 44mAlaska Airlines
Fri 6/63:03 pmSTL - IDA
1 stop8h 31mAlaska Airlines
Deal found 5/18$500

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 May 19, 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

Wed 8/20

6:00 am-11:58 am

1 stop4h 58m

Chicago O'Hare Intl

Mon 8/25

7:35 am-2:19 pm

1 stop7h 44m

$247

Idaho FallsChicago

IDA - MDW

IDAMDW

Idaho Falls Fanning Field

Wed 8/20

6:00 am-5:47 pm

2 stops10h 47m

Chicago Midway

Sat 8/23

1:43 pm-10:27 pm

2 stops9h 44m

$268

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Mon 6/16

6:35 pm-6:12 am

1 stop10h 37m

Chicago O'Hare Intl

Thu 6/19

10:15 pm-3:40 pm

2 stops18h 25m

$269

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Fri 8/22

6:13 am-7:03 am

1 stop23h 50m

Chicago O'Hare Intl

Mon 8/25

3:20 pm-10:39 pm

1 stop8h 19m

$322

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Wed 8/6

12:46 pm-5:11 pm

Nonstop3h 25m

Chicago O'Hare Intl

Wed 8/13

9:55 am-12:10 pm

Nonstop3h 15m

$331

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

Wed 8/6

6:03 pm-12:30 am

1 stop5h 27m

Chicago O'Hare Intl

Wed 8/13

5:00 am-9:44 am

1 stop5h 44m

$351

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Sat 6/14

5:00 am-3:30 pm

2 stops9h 30m

Lambert-St Louis

Tue 6/17

5:20 am-9:44 am

1 stop5h 24m

$412

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Sat 6/14

6:00 am-2:36 pm

2 stops7h 36m

Lambert-St Louis

Tue 6/17

7:15 pm-10:55 pm

1 stop4h 40m

$444

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Sat 6/14

7:00 am-2:28 pm

1 stop6h 28m

Lambert-St Louis

Tue 6/17

5:37 am-1:21 pm

1 stop8h 44m

$459

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Mon 6/2

4:20 pm-12:04 am

1 stop6h 44m

Lambert-St Louis

Fri 6/6

3:03 pm-10:34 pm

1 stop8h 31m

$500

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/19

Showing 1-10 of 21 results
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2
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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 May 19, 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.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 May 19, 2025.
See what other customers who have flown with Alaska Airlines, Delta and United Airlines from Idaho Falls to Illinois have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,951 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,743 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

    $180 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Alaska Airlines and United Airlines, with prices starting from $193 and $209, 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 - Lambert-St Louis and Idaho Falls Fanning Field - Chicago Midway.

  • 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 $287, our data indicates the cheapest price to be $108. The most popular route (Idaho Falls Fanning Field - Chicago O'Hare Intl), is priced around $299.

  • 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

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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 May 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$323Average$486FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$361Average$651FlexibilityNo cancel feeOn-time69%

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