$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 11/20. 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

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

Tue, Nov 11 - Sun, Nov 16
United Airlines Logo
7:45 am - 9:32 amSUX-ORD
1h 47mnonstop
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$204United Airlines
Find Deal
Fri, Mar 6 - Thu, Mar 12
United Airlines Logo
12:45 pm - 2:40 pmSUX-ORD
1h 55mnonstop
United Airlines Logo
3:35 pm - 5:32 pmORD-SUX
1h 57mnonstop
$244United Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
United Airlines Logo
7:50 am - 9:37 amSUX-ORD
1h 47mnonstop
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$265United Airlines
Find Deal
Wed, Oct 29 - Sun, Nov 2
United Airlines Logo
7:45 am - 9:32 amSUX-ORD
1h 47mnonstop
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$326United Airlines
Find Deal
Tue, Nov 11 - Tue, Nov 18
United Airlines Logo
6:46 pm - 11:36 amSUX-ORD
16h 50m2 stops
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$327United Airlines
Find Deal
Tue, Nov 11 - Sun, Nov 16
United Airlines Logo
6:46 pm - 11:36 amSUX-ORD
16h 50m2 stops
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$350United Airlines
Find Deal
Tue, Nov 11 - Tue, Nov 18
United Airlines Logo
7:45 am - 9:32 amSUX-ORD
1h 47mnonstop
United Airlines Logo
8:00 pm - 6:08 pmORD-SUX
22h 08m1 stop
$357United Airlines
Find Deal
Tue, Nov 11 - Sun, Nov 16
United Airlines Logo
6:46 pm - 7:40 pmSUX-ORD
24h 54m1 stop
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$368United Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
United Airlines Logo
6:52 pm - 9:40 amSUX-ORD
14h 48m1 stop
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$377United Airlines
Find Deal
Fri, Mar 6 - Thu, Mar 12
United Airlines Logo
6:31 pm - 11:19 amSUX-ORD
16h 48m1 stop
United Airlines Logo
3:35 pm - 5:32 pmORD-SUX
1h 57mnonstop
$391United Airlines
Find Deal
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 $260 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 $260.

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, Thursday 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 Sunday being the most expensive.

Find deals

Good to know

Low seasonDecember
Cheapest flight$166
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly and prices are also 17% 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.

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

    The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $476 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 $476.

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 $300 one-way - $322 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 8978 reviews
7.1Entertainment
8.1Crew
6.6Food
7.7Boarding
7.3Comfort
Airline reviews

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

6.0 GoodJerome, Oct 2025IAD - ORD
Read more United Airlines reviews

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

Excellent experience. Starting with the agent at the Premier bag drop who noticed I was very early for my scheduled flight and offered to rebook me on an earlier flight with my seat preference. She would not let me leave the counter until she knew that all of the changes and new boarding pass showed up on my United app. At the gate, the flight boarded quickly such that we departed early and the flight was smooth. We arrived 20 minutes early at ORD and I was able to be home in time for dinner. One of the best flights I've had.

Salina to travers city was great! But the sept 24 Tranverse city was not! Traverse city to chichago was cancelled, i went to Denver & got to Salina 6 hours later!

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

Flight attendant in first class gave poor service (like he didn't want to be there) and food was awful. We sat waiting for gate upon arrival over 45 mins.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Overall it was good. I missed my connection but I was put on another flight.

Overall a very poor experience - booked premium economy tickets but due to last minute flight delays , all my itinery went for a toss and had to fly economy class with no access to lounge or any compensation by united airlines to make up for the flight delays . i had expected better experience than that from united.

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

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

Information on your arrival and departure airports

Sioux City (SUX)

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