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$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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — ORD
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
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 February 13, 2026.

This United Airlines deal was found by Cheapflights users on 2/12. 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 12/259:03 am
SUX
-
ORD
Nonstop1h 52m
United Airlines
Wed 1/64:00 pm
ORD
-
SUX
Nonstop1h 54m
United Airlines
Deal found 2/12$204
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/612:53 pm
SUX
-
ORD
Nonstop1h 47m
United Airlines
Thu 3/123:50 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/11$244
This United Airlines deal was found by Cheapflights users on 2/10. 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 6/2712:45 pm
SUX
-
ORD
Nonstop1h 55m
United Airlines
Wed 8/193:35 pm
ORD
-
SUX
Nonstop1h 57m
United Airlines
Deal found 2/10$265
This United Airlines deal was found by Cheapflights users on 2/11. 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.
Tue 3/1012:53 pm
SUX
-
ORD
Nonstop1h 47m
United Airlines
Thu 3/123:50 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/11$308
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/1212:53 pm
SUX
-
ORD
Nonstop1h 47m
United Airlines
Thu 3/123:50 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/11$314
This United Airlines deal was found by Cheapflights users on 2/9. 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.
Tue 3/3112:55 pm
SUX
-
ORD
Nonstop1h 45m
United Airlines
Thu 4/24:05 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/9$326
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/712:53 pm
SUX
-
ORD
Nonstop1h 47m
United Airlines
Wed 3/118:10 pm
ORD
-
SUX
2 stops14h 35m
United Airlines
Deal found 2/11$337
This United Airlines deal was found by Cheapflights users on 2/10. 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 2/1112:45 pm
SUX
-
ORD
Nonstop1h 55m
United Airlines
Sun 2/153:50 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/10$354
This United Airlines deal was found by Cheapflights users on 2/10. 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 3/2012:53 pm
SUX
-
ORD
Nonstop1h 47m
United Airlines
Sun 3/223:50 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/10$355
This United Airlines deal was found by Cheapflights users on 2/10. 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 3/236:30 pm
SUX
-
ORD
2 stops15h 11m
United Airlines
Sun 3/294:05 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/10$362
This United Airlines deal was found by Cheapflights users on 2/11. 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.
Tue 3/1012:53 pm
SUX
-
ORD
Nonstop1h 47m
United Airlines
Wed 3/113:50 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 2/11$363

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 February 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$204
(United Airlines)

One-way from

$166
(United Airlines)

Popular in

May

Cheapest in

November

Average price

$354

Good round-trip deal

$393 or less

Good one-way deal

$299 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
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($44 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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

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 February 13, 2026.
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 3/23

12:53 pm-2:40 pm

Nonstop1h 47m

Chicago O'Hare Intl

Sun 3/29

4:05 pm-5:56 pm

Nonstop1h 51m

$204

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 3/6

12:53 pm-2:40 pm

Nonstop1h 47m

Chicago O'Hare Intl

Thu 3/12

3:50 pm-5:41 pm

Nonstop1h 51m

$244

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 6/27

12:45 pm-2:40 pm

Nonstop1h 55m

Chicago O'Hare Intl

Wed 8/19

3:35 pm-5:32 pm

Nonstop1h 57m

$265

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Tue 3/10

12:53 pm-2:40 pm

Nonstop1h 47m

Chicago O'Hare Intl

Thu 3/12

3:50 pm-5:41 pm

Nonstop1h 51m

$308

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Thu 3/12

12:53 pm-2:40 pm

Nonstop1h 47m

Chicago O'Hare Intl

Thu 3/12

3:50 pm-5:41 pm

Nonstop1h 51m

$314

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 3/7

12:53 pm-2:40 pm

Nonstop1h 47m

Chicago O'Hare Intl

Wed 3/11

8:10 pm-10:45 am

2 stops14h 35m

$337

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 3/20

12:53 pm-2:40 pm

Nonstop1h 47m

Chicago O'Hare Intl

Sun 3/22

3:50 pm-5:41 pm

Nonstop1h 51m

$355

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Tue 6/30

12:45 pm-2:40 pm

Nonstop1h 55m

Chicago O'Hare Intl

Tue 7/7

3:35 pm-5:32 pm

Nonstop1h 57m

$355

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 6/12

12:45 pm-2:40 pm

Nonstop1h 55m

Chicago O'Hare Intl

Mon 6/15

3:35 pm-5:32 pm

Nonstop1h 57m

$355

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sun 3/22

12:53 pm-2:40 pm

Nonstop1h 47m

$166

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 14 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, September is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $102). Flying from Sioux City to Illinois in June is currently the most expensive (average of $224). 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 February 13, 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 February 13, 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 February 13, 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
9,283 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,283 reviews
United Airlines
7.4
Good
9,283 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 47m. 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 $454 for a flight from Sioux City to Illinois. The cheapest flight overall is $165 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, September is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $102). Flying from Sioux City to Illinois in June is currently the most expensive (average of $224). 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 Sioux City 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 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 February 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$265Average$389FlexibilityNo cancel feeOn-time69%

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