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$298+ 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 11/6. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — ORD
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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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 November 3, 2025.

This United Airlines deal was found by Cheapflights users on 11/3. 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 11/77:45 amSUX - ORD
Nonstop1h 47mUnited Airlines
Sun 11/99:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 11/3$354
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/16:46 pmSUX - ORD
1 stop14h 54mUnited Airlines
Mon 12/89:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 11/3$368
This United Airlines deal was found by Cheapflights users on 11/2. 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 11/86:46 pmSUX - ORD
2 stops23h 45mUnited Airlines
Sun 11/99:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 11/2$419
This United Airlines deal was found by Cheapflights users on 11/2. 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 11/186:46 pmSUX - ORD
2 stops16h 50mUnited Airlines
Sat 11/229:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 11/2$451
This United Airlines deal was found by Cheapflights users on 11/3. 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 11/127:45 amSUX - ORD
Nonstop1h 47mUnited Airlines
Fri 11/149:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Deal found 11/3$506
This United Airlines deal was found by Cheapflights users on 11/2. 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 11/77:45 amSUX - ORD
Nonstop1h 47mUnited Airlines
Mon 11/106:00 pmORD - SUX
2 stops24h 08mUnited Airlines
Deal found 11/2$513

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 November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$354
(United Airlines)

One-way from

$298
(United Airlines)

Popular in

May

Cheapest in

December

Average price

$260

Good round-trip deal

$302 or less

Good one-way deal

$202 or less
Provider with most accurate pricing for Sioux City Sioux Gateway-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Sioux City Sioux Gateway-Chicago (CHI) flights.
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From Sioux City Sioux Gateway to Illinois
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One-way flight from Sioux City Sioux Gateway to Illinois
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Highest demand for flights based on searches. 5% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Sioux City Sioux Gateway to Illinois.
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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 November 3, 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

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

$354

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 11/8

7:45 am-9:32 am

Nonstop1h 47m

Chicago O'Hare Intl

Sun 11/9

9:10 pm-10:59 pm

Nonstop1h 49m

$354

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Mon 12/1

6:46 pm-9:40 am

1 stop14h 54m

Chicago O'Hare Intl

Mon 12/8

9:10 pm-10:59 pm

Nonstop1h 49m

$368

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Tue 11/18

6:46 pm-11:36 am

2 stops16h 50m

Chicago O'Hare Intl

Sat 11/22

9:10 pm-10:59 pm

Nonstop1h 49m

$451

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 11/7

7:45 am-9:32 am

Nonstop1h 47m

Chicago O'Hare Intl

Mon 11/10

6:00 pm-6:08 pm

2 stops24h 08m

$513

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Thu 11/6

7:45 am-9:32 am

Nonstop1h 47m

$298

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 11/7

7:45 am-9:32 am

Nonstop1h 47m

$298

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

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, November is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $98). 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 November 3, 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 November 3, 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 November 3, 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
8,997 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
8,997 reviews
United Airlines
7.4
Good
8,997 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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 $313 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 $354.

  • 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, November is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $98). 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.

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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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$219Average$299FlexibilityNo cancel feeOn-time69%

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