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$176+ Cheap flights from Sioux City (SUX) 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — ORD
Aug 24 — Aug 311
Mon 8/24
Mon 8/31
1 adult, Economy
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Cheap flight deals from Sioux City to Illinois

Cheapest flights from Sioux City to Illinois
Explore the most affordable flight options available from Sioux City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 25, 2026.

This United Airlines deal was found by Cheapflights users on 7/23. 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.
Thu 8/208:10 am
SUX
-
ORD
Nonstop1h 54m
United Airlines
Thu 8/274:00 pm
ORD
-
SUX
Nonstop1h 53m
United Airlines
Deal found 7/23$224
This United Airlines deal was found by Cheapflights users on 7/24. 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.
Fri 8/218:10 am
SUX
-
ORD
Nonstop1h 54m
United Airlines
Mon 8/244:00 pm
ORD
-
SUX
Nonstop1h 53m
United Airlines
Deal found 7/24$233
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Thu 8/208:10 am
SUX
-
ORD
Nonstop1h 54m
United Airlines
Mon 8/244:00 pm
ORD
-
SUX
Nonstop1h 53m
United Airlines
Deal found 7/22$264
This United Airlines deal was found by Cheapflights users on 7/24. 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.
Fri 8/146:43 pm
SUX
-
ORD
2 stops18h 09m
United Airlines
Sat 8/154:00 pm
ORD
-
SUX
Nonstop1h 53m
United Airlines
Deal found 7/24$344
This United Airlines deal was found by Cheapflights users on 7/24. 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 12/29:03 am
SUX
-
ORD
Nonstop1h 52m
United Airlines
Sat 12/54:00 pm
ORD
-
SUX
Nonstop1h 54m
United Airlines
Deal found 7/24$346
This United Airlines deal was found by Cheapflights users on 7/21. 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.
Fri 7/248:10 am
SUX
-
ORD
Nonstop1h 52m
United Airlines
Sun 7/263:59 pm
ORD
-
SUX
Nonstop1h 54m
United Airlines
Deal found 7/21$374
This United Airlines deal was found by Cheapflights users on 7/24. 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 9/268:35 am
SUX
-
ORD
Nonstop1h 54m
United Airlines
Sat 10/1010:34 am
ORD
-
SUX
2 stops13h 09m
United Airlines
Deal found 7/24$392

Find flight deals from Sioux City to Illinois

Keep the following information in mind while searching for Sioux City to Illinois flight deals. Data was last updated July 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$224
(United Airlines)

One-way from

$176
(United Airlines)

Good round-trip deal

$353 or less

Good one-way deal

$307 or less
Provider with most accurate pricing for Sioux City Sioux Gateway-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sioux City Sioux Gateway-Chicago (CHI) flights.
Search Deals
From Sioux City Sioux Gateway to Illinois
Search Deals
One-way flight from Sioux City Sioux Gateway to Illinois
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Price to beat on a round-trip flight from Sioux City Sioux Gateway to Illinois.
Search Deals
Price to beat on a one-way flight from Sioux City Sioux Gateway to Illinois.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Sioux City 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 July 25, 2026.
Use the filters below to find and compare flights from Sioux City to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Wed 12/2

9:03 am-10:55 am

Nonstop1h 52m

Chicago O'Hare Intl

Sat 12/5

4:00 pm-5:54 pm

Nonstop1h 54m

$346

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 9/12

9:05 am-10:59 am

Nonstop1h 54m

Chicago O'Hare Intl

Mon 9/14

8:20 pm-11:43 pm

1 stop27h 23m

$406

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 9/26

8:35 am-10:29 am

Nonstop1h 54m

Chicago O'Hare Intl

Sat 10/10

5:00 am-11:43 pm

1 stop18h 43m

$410

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 8/14

8:10 am-10:04 am

Nonstop1h 54m

Chicago O'Hare Intl

Tue 8/18

4:00 pm-5:53 pm

Nonstop1h 53m

$486
Cheapest one-way
Quickest one-way

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Thu 8/20

8:10 am-10:04 am

Nonstop1h 54m

$176

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/23

Sorted by cheapest first

Best time to book a flight from Sioux City to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Sioux City 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 Sioux City to Illinois

What is the cheapest time of day to fly from SUX to IL?

Find hourly flight availability from Sioux City 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 July 25, 2026.

When flying from Sioux City 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.

Weekly flight availability from Sioux City to Illinois

Explore weekly flight availability from Sioux City to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 25, 2026.

The most flights from SUX to USIL are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

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 July 25, 2026.
Read reviews from past customers who have flown United Airlines from Sioux City to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,034 reviews

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
10,034 reviews
United Airlines
7.4
Good
10,034 reviews

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

Find useful and relevant information for your journey from Sioux City 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 Sioux City to Illinois?

    Most people fly from Sioux City Sioux Gateway (SUX) if they book a flight from Sioux City to Illinois. Sioux City Sioux Gateway is conveniently located just 7.0 mi from Sioux City’s city center.

  • How long is the flight from Sioux City to Illinois?

    There are many flights that can get you from Sioux City to Illinois in 1h 52m. Fly via United Airlines to get the fastest option. The distance from Sioux City to Illinois is about 435 mi. All flights are typically nonstop.

  • What are the cheapest flights from Sioux City to Illinois?

    On average you can expect to pay $484 for a flight from Sioux City to Illinois. The cheapest flight overall is $175 while the most popular route, (Sioux City Sioux Gateway - Chicago O'Hare Intl) is currently priced at $233.

  • Can I find deals for flights from Sioux City to Illinois that include hotel bookings?

    Yes. In addition to deals on Sioux City to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Sioux City to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sioux City to Illinois.

  • Can I find deals for business class flights from Sioux City to Illinois?

    Yes. Cheapflights offers flight deals from Sioux City 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.

See more FAQs

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Top airline flying from Sioux City to Illinois

Discover the top airline that operate flights from Sioux City 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 July 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$244Average$354FlexibilityNo cancel feeOn-time69%

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