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$209+ 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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ORD
abr. 2 — abr. 91
mié. 4/2
mié. 4/9
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 marzo 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$327
(American Airlines)

One-way from

$209
(United)
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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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 marzo 28, 2025.

This American Airlines deal was found by Cheapflights users on 3/27. 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.
mié. 4/2312:59 pmIDA - STL
1 stop5h 30mAmerican Airlines
sáb. 5/35:26 amSTL - IDA
1 stop8h 03mAmerican Airlines
Deal found 3/27$327
This United Airlines deal was found by Cheapflights users on 3/27. 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.
mié. 4/234:15 pmIDA - STL
1 stop4h 35mUnited Airlines
sáb. 5/36:30 amSTL - IDA
2 stops9h 40mUnited Airlines
Deal found 3/27$332
This Delta deal was found by Cheapflights users on 3/27. 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.
jue. 4/176:00 amIDA - ORD
1 stop5h 48mDelta
mar. 4/221:55 pmORD - IDA
1 stop5h 20mDelta
Deal found 3/27$343
This Hawaiian Airlines deal was found by Cheapflights users on 3/27. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/38:00 amIDA - ORD
1 stop7h 53mHawaiian Airlines
lun. 4/77:00 amORD - IDA
1 stop9h 34mHawaiian Airlines
Deal found 3/27$560
This Delta deal was found by Cheapflights users on 3/27. 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.
jue. 4/176:00 amIDA - MDW
2 stops7h 22mDelta
mar. 4/223:02 pmMDW - IDA
2 stops8h 54mDelta
Deal found 3/27$569
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
vie. 4/114:11 pmIDA - ORD
1 stop12h 48mAlaska Airlines
mar. 4/152:05 pmORD - IDA
1 stop9h 30mAlaska Airlines
Deal found 3/27$583
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
vie. 4/114:11 pmIDA - STL
1 stop6h 48mAlaska Airlines
mar. 4/156:44 amSTL - IDA
1 stop9h 50mAlaska Airlines
Deal found 3/27$647
This United Airlines deal was found by Cheapflights users on 3/27. 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.
jue. 4/34:15 pmIDA - ORD
1 stop7h 20mUnited Airlines
lun. 4/79:09 amORD - IDA
2 stops12h 58mUnited Airlines
Deal found 3/27$684

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 marzo 28, 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 FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mié. 4/23

12:59 pm-7:29 pm

1 stop5h 30m

Lambert-St Louis

sáb. 5/3

5:26 am-12:29 pm

1 stop8h 03m

$327

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mié. 4/23

4:15 pm-9:50 pm

1 stop4h 35m

Lambert-St Louis

sáb. 5/3

6:30 am-3:10 pm

2 stops9h 40m

$332

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

jue. 4/17

6:00 am-12:48 pm

1 stop5h 48m

Chicago O'Hare Intl

mar. 4/22

1:55 pm-6:15 pm

1 stop5h 20m

$343

Idaho FallsChicago

IDA - MDW

IDAMDW

Idaho Falls Fanning Field

jue. 4/17

6:00 am-2:22 pm

2 stops7h 22m

Chicago Midway

mar. 4/22

3:02 pm-10:56 pm

2 stops8h 54m

$569

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 4/11

4:11 pm-5:59 am

1 stop12h 48m

Chicago O'Hare Intl

mar. 4/15

2:05 pm-10:35 pm

1 stop9h 30m

$583

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

vie. 4/11

4:11 pm-11:59 pm

1 stop6h 48m

Lambert-St Louis

mar. 4/15

6:44 am-3:34 pm

1 stop9h 50m

$647

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

sáb. 6/7

5:00 am-3:30 pm

2 stops9h 30m

$209

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mié. 4/16

4:11 pm-11:59 pm

1 stop6h 48m

$230

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

jue. 4/24

6:55 pm-12:42 am

1 stop4h 47m

$231

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

sáb. 6/7

7:00 am-2:28 pm

1 stop6h 28m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

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 $323). 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 marzo 28, 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 marzo 28, 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
9,798 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,798 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,896 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,603 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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?

    $209 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Alaska Airlines and Delta, with prices starting from $230 and $231, 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.

  • 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 $323). 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 airline flying from Idaho Falls to Illinois

Discover the top airline 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 marzo 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$362Average$669FlexibilityNo cancel feeOn-time69%
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