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$173+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ORD
ene. 21 — ene. 281
mar. 1/21
mar. 1/28
1 adult, Economy
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Cheap flight deals from Idaho Falls to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Idaho Falls (IDA) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 16, 2025.

Round-trip from

$305
(Delta)

One-way from

$173
(Delta)
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 enero 16, 2025.

This Delta deal was found by Cheapflights users on 1/15. 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. 2/46:00 amIDA - STL
1 stop6h 43mDelta
mar. 2/117:40 amSTL - IDA
1 stop5h 50mDelta
Deal found 1/15$305
This United deal was found by Cheapflights users on 1/15. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 2/142:30 pmIDA - ORD
1 stop5h 57mUnited Airlines
mar. 2/182:35 pmORD - IDA
1 stop7h 32mUnited Airlines
Deal found 1/15$415
This Delta deal was found by Cheapflights users on 1/15. 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.
vie. 2/146:00 amIDA - ORD
1 stop5h 45mDelta
mar. 2/1812:15 pmORD - IDA
2 stops7h 03mDelta
Deal found 1/15$426
This Alaska Airlines deal was found by Cheapflights users on 1/16. 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.
lun. 2/174:07 pmIDA - ORD
1 stop12h 46mAlaska Airlines
vie. 2/217:45 amORD - IDA
1 stop15h 51mAlaska Airlines
Deal found 1/16$590
This United deal was found by Cheapflights users on 1/16. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/195:44 pmIDA - STL
2 stops24h 12mUnited Airlines
dom. 2/235:36 pmSTL - IDA
2 stops17h 04mUnited Airlines
Deal found 1/16$610
This American Airlines deal was found by Cheapflights users on 1/15. 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.
jue. 6/51:47 pmIDA - STL
1 stop7h 40mAmerican Airlines
dom. 6/87:31 amSTL - IDA
1 stop14h 32mAmerican Airlines
Deal found 1/15$725
This American Airlines deal was found by Cheapflights users on 1/15. 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. 1/1712:55 pmIDA - ORD
1 stop7h 19mAmerican Airlines
mar. 1/211:16 pmORD - IDA
1 stop10h 01mAmerican Airlines
Deal found 1/15$780
This Delta deal was found by Cheapflights users on 1/15. 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.
vie. 4/46:00 amIDA - MDW
2 stops7h 17mDelta
mar. 4/81:15 pmMDW - IDA
2 stops10h 20mDelta
Deal found 1/15$813

Find flights from Idaho Falls to Illinois within your budget

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 enero 16, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mar. 2/4

6:00 am-1:43 pm

1 stop6h 43m

Lambert-St Louis

mar. 2/11

7:40 am-12:30 pm

1 stop5h 50m

$305

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 2/14

2:30 pm-9:27 pm

1 stop5h 57m

Chicago O'Hare Intl

mar. 2/18

2:35 pm-9:07 pm

1 stop7h 32m

$415

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

vie. 2/14

6:00 am-12:45 pm

1 stop5h 45m

Chicago O'Hare Intl

mar. 2/18

12:15 pm-6:18 pm

2 stops7h 03m

$426

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

lun. 2/17

4:07 pm-5:53 am

1 stop12h 46m

Chicago O'Hare Intl

vie. 2/21

7:45 am-10:36 pm

1 stop15h 51m

$590

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

mié. 2/19

5:44 pm-6:56 pm

2 stops24h 12m

Lambert-St Louis

dom. 2/23

5:36 pm-9:40 am

2 stops17h 04m

$610

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

jue. 6/5

1:47 pm-10:27 pm

1 stop7h 40m

Lambert-St Louis

dom. 6/8

7:31 am-9:03 pm

1 stop14h 32m

$725

Idaho FallsChicago

IDA - MDW

IDAMDW

Idaho Falls Fanning Field

vie. 4/4

6:00 am-2:17 pm

2 stops7h 17m

Chicago Midway

mar. 4/8

1:15 pm-10:35 pm

2 stops10h 20m

$813

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

sáb. 3/1

6:00 am-2:12 pm

1 stop7h 12m

$173

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

lun. 1/27

6:32 pm-5:55 am

3 stops34h 23m

$221

Idaho FallsChicago

IDA - ORD

IDAORD

Idaho Falls Fanning Field

sáb. 3/1

4:07 pm-1:04 pm

2 stops19h 57m

$224

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/16

Showing 1-10 of 12 results
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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.

Travel insights for flights from Idaho Falls to Illinois

Get recent, data-driven insights about flights from Idaho Falls to Illinois including ideal travel times, pricing trends, and more.

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 $320). 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 enero 16, 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 enero 16, 2025.
See what other customers who have flown with United Airlines and Delta 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
9,681 reviews

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 10

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
9,681 reviews
Alaska Airlines
8.0
Very good
9,681 reviews

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 10

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
8,511 reviews
Alaska Airlines
8.0
Very good
9,681 reviews

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 10

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
8,965 reviews
Alaska Airlines
8.0
Very good
9,681 reviews

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 10

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
9,681 reviews

Food

7.1

Entertainment

7.1

Crew

8.5

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 10

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?

    $173 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 $224 and $363, 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.

  • 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 $320). 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

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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 enero 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$402Average$670FlexibilityNo cancel feeOn-time69%
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