HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sioux City

$204+ Cheap flights from Illinois to Sioux City (SUX)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SUX
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Sioux City 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 Illinois to Sioux City

Keep the following information in mind while searching for Illinois to Sioux City flight deals. Data was last updated November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$204
(United Airlines)

Popular in

June

Cheapest in

December

Average price

$244

Good round-trip deal

$204 or less
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
Highest demand for flights based on searches. 32% potential increase in price ($194 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 14% potential price decrease ($53 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Illinois to Sioux City Sioux Gateway.
Search Deals

Find 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 November 3, 2025.

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 12/59:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Mon 12/87:50 amSUX - ORD
Nonstop1h 47mUnited Airlines
Deal found 11/2$204
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 12/99:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Sun 12/217:50 amSUX - ORD
Nonstop1h 55mUnited Airlines
Deal found 11/2$243
This United Airlines deal was found by Cheapflights users on 10/31. 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 11/19:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Wed 11/57:45 amSUX - ORD
Nonstop1h 47mUnited Airlines
Deal found 10/31$354
This United Airlines deal was found by Cheapflights users on 11/1. 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 11/269:10 pmORD - SUX
Nonstop1h 49mUnited Airlines
Fri 11/287:45 amSUX - ORD
Nonstop1h 47mUnited Airlines
Deal found 11/1$416

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 November 3, 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 12/5

9:10 pm-10:59 pm

Nonstop1h 49m

Sioux City Sioux Gateway

Mon 12/8

7:50 am-9:37 am

Nonstop1h 47m

$204

ChicagoSioux City

ORD - SUX

ORDSUX

Chicago O'Hare Intl

Tue 12/9

9:10 pm-10:59 pm

Nonstop1h 49m

Sioux City Sioux Gateway

Sun 12/21

7:50 am-9:45 am

Nonstop1h 55m

$243

ChicagoSioux City

ORD - SUX

ORDSUX

Chicago O'Hare Intl

Mon 1/5

9:18 pm-11:15 pm

Nonstop1h 57m

Sioux City Sioux Gateway

Thu 1/8

12:45 pm-2:40 pm

Nonstop1h 55m

$326

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

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 November 3, 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.

Weekly flight availability from Illinois to Sioux City

Explore weekly flight availability from Illinois to Sioux City. 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 USIL to SUX 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).

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 49m. Your travel time will be generally consistent. The distance from Illinois to Sioux City is about 435 mi. All flights are typically nonstop.

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

    While on average a flight from Illinois to Sioux City is generally $244, our data shows the cheapest flight currently is $204. When looking at the most popular route, (Chicago O'Hare Intl - Sioux City Sioux Gateway), you can expect to pay $204 for that flight.

  • 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

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 Illinois to Sioux City

See prices for flight routes from nearby airports that may be better suited for you.
Salt Lake City to Cedar Rapids flights
Denver to Omaha flights
Dallas/Fort Worth to Des Moines flights
O'Hare Intl to Omaha flights
Denver to Des Moines flights
Denver to Cedar Rapids flights
LaGuardia to Omaha flights
Sky Harbor Intl to Des Moines flights
Dallas/Fort Worth to Omaha flights
Los Angeles to Omaha flights
Seattle to Omaha flights
John F Kennedy Intl to Omaha flights
Dulles Intl to Omaha flights
John F Kennedy Intl to Cedar Rapids flights
Baltimore to Omaha flights
John F Kennedy Intl to Des Moines flights
Dallas/Fort Worth to Cedar Rapids flights
San Francisco to Omaha flights
Denver to Moline flights
LaGuardia to Des Moines flights
Reagan-National to Omaha flights
Hobby to Des Moines flights
Newark to Omaha flights
Orlando to Omaha flights
Detroit to Omaha flights
Sky Harbor Intl to Omaha flights
Boston to Omaha flights
Reagan-National to Des Moines flights
Hobby to Omaha flights
San Francisco to Des Moines flights
Los Angeles to Des Moines flights
Minneapolis to Omaha flights
Portland to Omaha flights
Seattle to Cedar Rapids flights
Dulles Intl to Des Moines flights
Dallas/Fort Worth to Moline flights
LaGuardia to Cedar Rapids flights
Salt Lake City to Omaha flights
Reagan-National to Cedar Rapids flights
George Bush Intcntl to Des Moines flights
Newark to Cedar Rapids flights
Seattle to Des Moines flights
Dulles Intl to Cedar Rapids flights
Portland to Des Moines flights
Boston to Des Moines flights
Atlanta to Des Moines flights
Sky Harbor Intl to Cedar Rapids flights
Detroit to Des Moines flights
Ontario to Omaha flights
Love Field to Omaha flights

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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$204Average$416FlexibilityNo 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.