$166 Find Cheap Flights from Sioux City to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sioux City to Illinois departing on 5/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sioux City to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sioux City to Illinois, as well as popular online travel agencies
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Flight Deals

Book Cheap Sioux City to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Sioux City to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Sioux City to Illinois

ส., พ.ค. 16 - ส., พ.ค. 23
United Airlines Logo
12:55 pm - 2:40 pm
SUX
-
ORD
1h 45mnonstop
United Airlines Logo
4:00 pm - 5:54 pm
ORD
-
SUX
1h 54mnonstop
$204United Airlines
ส., มิ.ย. 27 - พ., ส.ค. 19
United Airlines Logo
7:43 am - 9:35 am
SUX
-
ORD
1h 52mnonstop
United Airlines Logo
4:00 pm - 5:53 pm
ORD
-
SUX
1h 53mnonstop
$244United Airlines
จ., พ.ค. 18 - จ., พ.ค. 25
United Airlines Logo
12:55 pm - 2:40 pm
SUX
-
ORD
1h 45mnonstop
United Airlines Logo
4:00 pm - 5:54 pm
ORD
-
SUX
1h 54mnonstop
$274United Airlines
พฤ., พ.ค. 28 - ศ., พ.ค. 29
United Airlines Logo
7:53 am - 9:45 am
SUX
-
ORD
1h 52mnonstop
United Airlines Logo
4:00 pm - 5:54 pm
ORD
-
SUX
1h 54mnonstop
$326United Airlines
อ., พ.ค. 5 - ส., พ.ค. 9
United Airlines Logo
12:55 pm - 2:40 pm
SUX
-
ORD
1h 45mnonstop
United Airlines Logo
4:15 pm - 6:06 pm
ORD
-
SUX
1h 51mnonstop
$340United Airlines
อ., พ.ค. 19 - จ., พ.ค. 25
United Airlines Logo
12:55 pm - 2:40 pm
SUX
-
ORD
1h 45mnonstop
United Airlines Logo
4:00 pm - 5:54 pm
ORD
-
SUX
1h 54mnonstop
$355United Airlines
ส., พ.ค. 16 - ส., พ.ค. 23
United Airlines Logo
12:55 pm - 2:40 pm
SUX
-
ORD
1h 45mnonstop
United Airlines Logo
4:00 pm - 5:54 pm
ORD
-
SUX
1h 54mnonstop
$367United Airlines
ส., มิ.ย. 27 - พ., ส.ค. 19
United Airlines Logo
7:43 am - 9:35 am
SUX
-
ORD
1h 52mnonstop
United Airlines Logo
7:45 pm - 10:55 am
ORD
-
SUX
15h 10m
1 stop
$384United Airlines
ส., พ.ค. 16 - ส., พ.ค. 23
United Airlines Logo
6:00 am - 12:58 am
SUX
-
ORD
18h 58m
1 stop
United Airlines Logo
4:00 pm - 5:54 pm
ORD
-
SUX
1h 54mnonstop
$386United Airlines
อ., พ.ค. 19 - จ., พ.ค. 25
United Airlines Logo
6:00 am - 12:58 am
SUX
-
ORD
18h 58m
1 stop
United Airlines Logo
4:00 pm - 5:54 pm
ORD
-
SUX
1h 54mnonstop
$392United Airlines
Booking Insights

KAYAK's insights & trends for Sioux City to Illinois flights

Get data-powered insights and trends into flights from Sioux City to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Sioux City to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Sioux City found in the last 72 hours was to Chicago, at $332 round-trip. The most popular route is from Sioux City (SUX) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $332.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Sioux City to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally in the afternoon, when round-trip flights cost $424 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $452.

What’s the cheapest day of the week to fly from Sioux City to Illinois?

The average price of all round-trip flights from Sioux City to Illinois clicked on KAYAK for each day over the last 12 months.

For Sioux City to Illinois, Friday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Illinois back to Sioux City, the best deals are generally found on Friday, with Monday being the most expensive.

Good to know

Low seasonNovember
Cheapest flight$166
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly and prices are also 23% lower on average.
Flight from Sioux City to Chicago

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Sioux City to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Sioux City to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Sioux City to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Sioux City to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Sioux City to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Sioux City to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Sioux City to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Sioux City to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Sioux City to the following destinations at these prices or less: Chicago $180 one-way - $455 round-trip

Reviews of the top airline flying from Sioux City to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Sioux City to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Sioux City to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9613 reviews
6.6Food
7.7Boarding
8.1Crew
7.3Comfort
7.1Entertainment
Airline reviews

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

2.0 MediocreDr. Joseph, Apr 2026
CLT - ORD
Read more United Airlines reviews

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

The flight I was supposed to be on was supposed to take off at 1:50 from State College. It was delayed over and over and over again until somehow I had to rebook on a flight that was supposed to have left State College at 8 am that morning but didn't end up taking off until almost 6 pm. Not only was this completely unacceptable, the "token from United" was a 15 dollar meal voucher that has to be used by today. I would personally like some miles added to my account for this inconvenience. I was in transit for 8 hours from the time I arrive at State College Aiport to when I got home. I was supposed to be home at 3 pm and I returned at 8 pm. Unacceptable. I have not been on an on Time united flight in nearly 5 years.

newer aircraft, ability to connect my headset via blue tooth for entertainment.

Very comfortable flight, snacks and drinks were good, good communication from crew. Could have used a little more information on timing of boarding for group 5

Great flight. Got to watch a movie. Smooth flight and early arrival at ORD.

It was better than excellent. The staff in Mason City were great. The young woman that pushed my wheelchair did more than could be expected of her. She came from India 17 years ago. I don't remember her name.

After arriving in Chicago, we were taxiing for 1.5 hours with infrequent and untruthful updates about the amount of time it would take to arrive at the gate. Minimally, the team could have provided timing expectations that were more truthful, especially one their original expectations were not met.

Every staff member was professional, friendly and courteous. The pizza twist was ok. It was warm but too much dough.

I had a terrible experience. My flight got delayed from Atlanta to Chicago on Monday April 6, 2026, and that led to me missing my next flight to Brussels. United Airlines didn’t provide me with any accommodation for shelter. I had to sleep at the airport in Chicago. The next flight I was put on didn’t leave until the evening hours of Tuesday 4/7/2026.

The flight was officially delayed 3 times, and was actually later than that. Combined, it was a 3 hour delay, but there was no recognition (miles, voucher, etc). The crew seemed stressed. The captain sounded nervous in his announcements. The flight itself was smooth and uneventful.

Everything you need to know for your flight from Sioux City to Illinois

Information on your arrival and departure airports