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$178+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — ORD
Feb 28 — Mar 71
Fri 2/28
Fri 3/7
1 adult, Economy
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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 February 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$260
(United)

One-way from

$178
(United Airlines)

Popular in

June

Cheapest in

December

Average price

$324

Good round-trip deal

$352 or less

Good one-way deal

$255 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. 6% potential increase in price ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in February 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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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 February 23, 2025.

This United deal was found by Cheapflights users on 2/22. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2810:00 amSUX - ORD
Nonstop1h 48mUnited Airlines
Sun 3/308:40 pmORD - SUX
Nonstop1h 46mUnited Airlines
Deal found 2/22$260

Find flights from Sioux City to Illinois within your budget

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 23, 2025.

Fly from

Sioux City

Fly to

Illinois

Route

Depart

Return

Price

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 3/28

10:00 am-11:48 am

Nonstop1h 48m

Chicago O'Hare Intl

Sun 3/30

8:40 pm-10:26 pm

Nonstop1h 46m

$260

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Fri 5/9

10:10 am-11:50 am

Nonstop1h 40m

$178

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/22

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.

Travel insights for flights from Sioux City to Illinois

Get recent, data-driven insights about flights from Sioux City to Illinois including ideal travel times, pricing trends, and more.

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 February 23, 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 February 23, 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).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 23, 2025.
United Airlines
7.4
Good
8,754 reviews

Entertainment

7.1

Boarding

7.7

Food

6.7

Overall

7.4

Comfort

7.3

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
8,754 reviews
United Airlines
7.4
Good
8,754 reviews

Entertainment

7.1

Boarding

7.7

Food

6.7

Overall

7.4

Comfort

7.3

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.

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

    On average you can expect to pay $376 for a flight from Sioux City to Illinois. The cheapest flight overall is $244 while the most popular route, (Sioux City Sioux Gateway - Chicago O'Hare Intl) is currently priced at $194.

  • 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.

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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 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$225Average$285FlexibilityNo cancel feeOn-time69%
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