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Sioux City

$161+ Cheap flights from Illinois to Sioux City (SUX)

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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SUX
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Illinois to Sioux City

Cheapest flights from Illinois to Sioux City
Explore the most affordable flight options available from Illinois to Sioux City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/16. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/199:18 pmORD - SUX
Nonstop1h 57mUnited Airlines
Tue 1/2012:45 pmSUX - ORD
Nonstop1h 55mUnited Airlines
Deal found 12/16$279
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/209:18 pmORD - SUX
Nonstop1h 57mUnited Airlines
Tue 12/236:54 pmSUX - ORD
1 stop22h 05mUnited Airlines
Deal found 12/17$702
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/237:42 pmORD - SUX
2 stops22h 31mUnited Airlines
Fri 12/267:50 amSUX - ORD
Nonstop1h 55mUnited Airlines
Deal found 12/17$769

Find flight deals from Illinois to Sioux City

Keep the following information in mind while searching for Illinois to Sioux City flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$204
(United Airlines)

One-way from

$161
(United Airlines)

Popular in

June

Cheapest in

October
Provider with most accurate pricing for Chicago (CHI)-Sioux City Sioux Gateway flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Sioux City Sioux Gateway flights.
Search Deals
From Illinois to Sioux City Sioux Gateway
Search Deals
One-way flight from Illinois to Sioux City Sioux Gateway
Search Deals
Highest demand for flights based on searches. 32% potential increase in price ($192 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 16% potential price decrease ($57 potential savings vs. average RT price).
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Sioux City 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 December 18, 2025.
Use the filters below to find and compare flights from Illinois to Sioux City that are best for you.

Fly from

Illinois

Fly to

Sioux City

Route

Depart

Return

Price

ChicagoSioux City

ORD - SUX

ORDSUX

Chicago O'Hare Intl

Fri 1/9

3:35 pm-5:28 pm

Nonstop1h 53m

Sioux City Sioux Gateway

Sun 1/11

12:45 pm-2:40 pm

Nonstop1h 55m

$204

ChicagoSioux City

ORD - SUX

ORDSUX

Chicago O'Hare Intl

Thu 2/5

3:35 pm-5:28 pm

Nonstop1h 53m

Sioux City Sioux Gateway

Sun 2/8

12:45 pm-2:40 pm

Nonstop1h 55m

$204

ChicagoSioux City

ORD - SUX

ORDSUX

Chicago O'Hare Intl

Sat 1/10

3:35 pm-5:28 pm

Nonstop1h 53m

Sioux City Sioux Gateway

Sat 1/17

12:45 pm-2:40 pm

Nonstop1h 55m

$204

ChicagoSioux City

ORD - SUX

ORDSUX

Chicago O'Hare Intl

Fri 2/6

3:35 pm-5:28 pm

Nonstop1h 53m

Sioux City Sioux Gateway

Sun 2/8

12:45 pm-2:40 pm

Nonstop1h 55m

$244

ChicagoSioux City

ORD - SUX

ORDSUX

Chicago O'Hare Intl

Fri 1/23

3:35 pm-5:28 pm

Nonstop1h 53m

$161

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Best time to book a flight from Illinois to Sioux City

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

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

Currently, September is the cheapest month in which you can book a flight from Illinois to Sioux City (average of $122). Flying from Illinois to Sioux City in April is currently the most expensive (average of $223). 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 IL to SUX?

Find hourly flight availability from Illinois to Sioux City. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Sioux City as you normally would.

Related info for your journey

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

    For a flight from Illinois to Sioux City, you will be flying into Sioux Gateway. Sioux City Sioux Gateway (SUX) is just 7.0 mi from the center of the city.

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

    United Airlines can get you from Illinois to Sioux City in just under 1h 53m. Your travel time will be generally consistent. The distance from Illinois to Sioux City is about 435 mi. All flights are typically nonstop.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to Sioux City 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 Illinois to Sioux City?

    Currently, September is the cheapest month in which you can book a flight from Illinois to Sioux City (average of $122). Flying from Illinois to Sioux City in April is currently the most expensive (average of $223). 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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Top airline flying from Illinois to Sioux City

Discover the top airline that operate flights from Illinois to Sioux City. 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$204Average$416FlexibilityNo cancel feeOn-time69%

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