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$265+ Cheap flights from Sioux City (SUX) to Illinois

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 6/27. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — ORD
Apr 29 — May 61
Wed 4/29
Wed 5/6
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 March 30, 2026.

This United Airlines deal was found by Cheapflights users on 3/30. 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 6/277:43 am
SUX
-
ORD
Nonstop1h 52m
United Airlines
Wed 8/194:00 pm
ORD
-
SUX
Nonstop1h 53m
United Airlines
Deal found 3/30$265
This United Airlines deal was found by Cheapflights users on 3/29. 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 4/1312:55 pm
SUX
-
ORD
Nonstop1h 45m
United Airlines
Fri 4/174:05 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 3/29$326
This United Airlines deal was found by Cheapflights users on 3/30. 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 4/1012:55 pm
SUX
-
ORD
Nonstop1h 45m
United Airlines
Fri 4/174:05 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 3/30$340
This United Airlines deal was found by Cheapflights users on 3/25. 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 3/2712:53 pm
SUX
-
ORD
Nonstop1h 47m
United Airlines
Sun 3/294:05 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 3/25$354
This United Airlines deal was found by Cheapflights users on 3/25. 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 5/267:53 am
SUX
-
ORD
Nonstop1h 52m
United Airlines
Sat 5/306:17 pm
ORD
-
SUX
1 stop16h 40m
United Airlines
Deal found 3/25$379
This United Airlines deal was found by Cheapflights users on 3/26. 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 4/812:55 pm
SUX
-
ORD
Nonstop1h 45m
United Airlines
Thu 4/94:05 pm
ORD
-
SUX
Nonstop1h 51m
United Airlines
Deal found 3/26$416
This United Airlines deal was found by Cheapflights users on 3/25. 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 4/1512:55 pm
SUX
-
ORD
Nonstop1h 45m
United Airlines
Sat 4/182:30 pm
ORD
-
SUX
1 stop20h 16m
United Airlines
Deal found 3/25$420
This United Airlines deal was found by Cheapflights users on 3/28. 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 8/611:32 am
SUX
-
ORD
1 stop22h 10m
United Airlines
Sun 8/94:00 pm
ORD
-
SUX
Nonstop1h 54m
United Airlines
Deal found 3/28$432
This United Airlines deal was found by Cheapflights users on 3/25. 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 10/69:03 am
SUX
-
ORD
Nonstop1h 52m
United Airlines
Fri 10/94:00 pm
ORD
-
SUX
Nonstop1h 54m
United Airlines
Deal found 3/25$442
This United Airlines deal was found by Cheapflights users on 3/27. 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 7/27:43 am
SUX
-
ORD
Nonstop1h 52m
United Airlines
Tue 7/72:33 pm
ORD
-
SUX
1 stop20h 24m
United Airlines
Deal found 3/27$447

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 March 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$265
(United Airlines)

Popular in

May

Cheapest in

November

Average price

$326

Good round-trip deal

$455 or less

Good one-way deal

$239 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
Highest demand for flights based on searches. 11% potential increase in price ($41 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 March 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 March 30, 2026.
Use the filters below to find and compare flights from Sioux City to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sat 6/27

7:43 am-9:35 am

Nonstop1h 52m

Chicago O'Hare Intl

Wed 8/19

4:00 pm-5:53 pm

Nonstop1h 53m

$265
Quickest round-trip

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Mon 4/13

12:55 pm-2:40 pm

Nonstop1h 45m

Chicago O'Hare Intl

Fri 4/17

4:05 pm-5:56 pm

Nonstop1h 51m

$326

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Tue 5/26

7:53 am-9:45 am

Nonstop1h 52m

Chicago O'Hare Intl

Sat 5/30

6:17 pm-10:57 am

1 stop16h 40m

$379

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Thu 7/2

7:43 am-9:35 am

Nonstop1h 52m

Chicago O'Hare Intl

Tue 7/7

9:50 pm-10:57 am

1 stop13h 07m

$447

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Wed 4/15

12:55 pm-2:40 pm

Nonstop1h 45m

Chicago O'Hare Intl

Sat 4/18

4:05 pm-5:56 pm

Nonstop1h 51m

$458

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Thu 8/6

7:43 am-9:35 am

Nonstop1h 52m

Chicago O'Hare Intl

Sun 8/9

4:00 pm-5:54 pm

Nonstop1h 54m

$458

Sioux CityChicago

SUX - ORD

SUXORD

Sioux City Sioux Gateway

Sun 4/12

12:55 pm-2:40 pm

Nonstop1h 45m

Chicago O'Hare Intl

Thu 4/16

4:05 pm-5:56 pm

Nonstop1h 51m

$506

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Sorted by cheapest first

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, February is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $101). Flying from Sioux City to Illinois in June is currently the most expensive (average of $221). 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 March 30, 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 March 30, 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 March 30, 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
9,514 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
9,514 reviews
United Airlines
7.4
Good
9,514 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

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 52m. 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 $423 for a flight from Sioux City to Illinois. The cheapest flight overall is $170 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, February is the cheapest month in which you can book a flight from Sioux City to Illinois (average of $101). Flying from Sioux City to Illinois in June is currently the most expensive (average of $221). 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 March 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$244Average$354FlexibilityNo cancel feeOn-time69%

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