HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$166+ 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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — ORD
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Sioux City to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap 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 September 15, 2025.

Round-trip from

$244
(United Airlines)

One-way from

$166
(United Airlines)

Popular in

May

Cheapest in

December

Good round-trip deal

$336 or less

Good one-way deal

$300 or less
From Sioux City Sioux Gateway to Illinois
Search Deals
One-way flight from Sioux City Sioux Gateway to Illinois
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
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.
Search Deals

Find 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 September 15, 2025.

This United Airlines deal was found by Cheapflights users on 9/14. 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.
Mon 10/137:50 amSUX - ORD
Nonstop1h 51mUnited Airlines
Thu 11/139:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 9/14$244
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Mon 10/137:50 amSUX - ORD
Nonstop1h 51mUnited Airlines
Tue 11/119:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 9/14$265
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Sun 10/127:50 amSUX - ORD
Nonstop1h 51mUnited Airlines
Sat 11/159:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 9/14$326
This United Airlines deal was found by Cheapflights users on 9/12. 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 10/36:51 pmSUX - ORD
2 stops12h 52mUnited Airlines
Mon 10/69:08 pmORD - SUX
Nonstop1h 52mUnited Airlines
Deal found 9/12$329
This United Airlines deal was found by Cheapflights users on 9/13. 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 9/177:49 amSUX - ORD
Nonstop1h 51mUnited Airlines
Tue 9/309:08 pmORD - SUX
Nonstop1h 52mUnited Airlines
Deal found 9/13$340
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Sun 10/126:51 pmSUX - ORD
2 stops25h 29mUnited Airlines
Thu 11/139:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 9/14$348
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Mon 10/137:50 amSUX - ORD
Nonstop1h 51mUnited Airlines
Fri 11/146:10 pmORD - SUX
2 stops23h 58mUnited Airlines
Deal found 9/14$350
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Mon 10/137:50 amSUX - ORD
Nonstop1h 51mUnited Airlines
Mon 11/109:30 pmORD - SUX
1 stop20h 38mUnited Airlines
Deal found 9/14$357
This United Airlines deal was found by Cheapflights users on 9/12. 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 10/256:51 pmSUX - ORD
2 stops14h 50mUnited Airlines
Sun 10/269:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 9/12$365

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 September 15, 2025.
Use the filters below to find and compare flights from Sioux City to Illinois that are best for you.

Fly from

Sioux City

Fly to

Illinois

Route

Depart

Return

Price

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Mon 10/13

7:50 am-9:41 am

Nonstop1h 51m

Chicago O'Hare Intl

Thu 11/13

9:10 pm-10:59 pm

Nonstop1h 49m

$244

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 2/28

12:45 pm-2:40 pm

Nonstop1h 55m

Chicago O'Hare Intl

Wed 3/4

3:35 pm-5:32 pm

Nonstop1h 57m

$265

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sun 11/9

7:45 am-9:32 am

Nonstop1h 47m

Chicago O'Hare Intl

Sun 11/9

9:10 pm-10:59 pm

Nonstop1h 49m

$326

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 11/7

7:45 am-9:32 am

Nonstop1h 47m

Chicago O'Hare Intl

Sun 11/9

9:10 pm-10:59 pm

Nonstop1h 49m

$326

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Mon 10/13

7:50 am-9:41 am

Nonstop1h 51m

Chicago O'Hare Intl

Tue 11/11

8:10 pm-6:08 pm

2 stops21h 58m

$327

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 10/3

6:51 pm-1:12 pm

1 stop18h 21m

Chicago O'Hare Intl

Mon 10/6

9:08 pm-11:00 pm

Nonstop1h 52m

$342

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 10/25

7:50 am-9:41 am

Nonstop1h 51m

Chicago O'Hare Intl

Sun 10/26

9:10 pm-10:59 pm

Nonstop1h 49m

$355

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 10/17

6:51 pm-2:55 pm

1 stop20h 04m

Chicago O'Hare Intl

Thu 11/13

9:10 pm-10:59 pm

Nonstop1h 49m

$357

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Mon 10/13

7:50 am-9:41 am

Nonstop1h 51m

Chicago O'Hare Intl

Mon 11/10

9:30 pm-6:08 pm

1 stop20h 38m

$357

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Mon 10/13

6:51 pm-7:43 am

2 stops12h 52m

Chicago O'Hare Intl

Sat 11/15

9:10 pm-10:59 pm

Nonstop1h 49m

$388

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 12 results
1
2

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 month to book a flight from Sioux City to Illinois?

Currently, August is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $245). Flying from Sioux City 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 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 September 15, 2025.

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 September 15, 2025.

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 September 15, 2025.
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
8,929 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Crew

8.1

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
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Crew

8.1

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 51m. 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 $393 for a flight from Sioux City to Illinois. The cheapest flight overall is $197 while the most popular route, (Sioux City Sioux Gateway - Chicago O'Hare Intl) is currently priced at $265.

  • 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.

  • What is the cheapest month to book a flight from Sioux City to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $245). Flying from Sioux City 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Sioux City to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Omaha to LaGuardia flights
Cedar Rapids to Denver flights
Omaha to Denver flights
Omaha to Seattle flights
Des Moines to Denver flights
Des Moines to Sky Harbor Intl flights
Omaha to Las Vegas flights
Omaha to Dallas/Fort Worth flights
Omaha to Orlando flights
Des Moines to Las Vegas flights
Cedar Rapids to Dallas/Fort Worth flights
Omaha to Sky Harbor Intl flights
Des Moines to Dallas/Fort Worth flights
Omaha to John F Kennedy Intl flights
Des Moines to LaGuardia flights
Omaha to Los Angeles flights
Cedar Rapids to Sky Harbor Intl flights
Cedar Rapids to Orlando flights
Cedar Rapids to John F Kennedy Intl flights
Des Moines to John F Kennedy Intl flights
Omaha to Hobby flights
Omaha to Newark flights
Cedar Rapids to LaGuardia flights
Omaha to O'Hare Intl flights
Des Moines to Orlando flights
Cedar Rapids to Las Vegas flights
Des Moines to Hobby flights
Des Moines to Los Angeles flights
Omaha to Atlanta flights
Omaha to Miami flights
Moline to Dallas/Fort Worth flights
Omaha to San Diego flights
Moline to Denver flights
Moline to Orlando flights
Cedar Rapids to Newark flights
Des Moines to Miami flights
Omaha to George Bush Intcntl flights
Omaha to Nashville flights
Omaha to Reagan-National flights
Des Moines to George Bush Intcntl flights
Omaha to Love Field flights
Des Moines to Seattle flights
Des Moines to Reagan-National flights
Omaha to Dulles Intl flights
Des Moines to Tampa flights
Omaha to Honolulu flights
Omaha to Charlotte flights
Cedar Rapids to Hobby flights
Omaha to Minneapolis flights
Omaha to Baltimore flights

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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$219Average$307FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.