$204 Find Cheap Flights from Sioux City to Illinois

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sioux City to Illinois departing on 2/21. 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

Sat, Feb 21 - Fri, Feb 27
United Airlines Logo
1:00 pm - 2:47 pm
SUX
-
ORD
1h 47mnonstop
United Airlines Logo
3:50 pm - 5:41 pm
ORD
-
SUX
1h 51mnonstop
$204United Airlines
Sun, May 3 - Sun, May 10
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
$216United Airlines
Fri, Mar 6 - Thu, Mar 12
United Airlines Logo
12:53 pm - 2:40 pm
SUX
-
ORD
1h 47mnonstop
United Airlines Logo
3:50 pm - 5:41 pm
ORD
-
SUX
1h 51mnonstop
$265United Airlines
Tue, Feb 3 - Sat, Feb 7
United Airlines Logo
12:45 pm - 2:40 pm
SUX
-
ORD
1h 55mnonstop
United Airlines Logo
3:35 pm - 5:28 pm
ORD
-
SUX
1h 53mnonstop
$326United Airlines
Thu, May 14 - Wed, May 20
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
$355United Airlines
Sat, Feb 21 - Fri, Feb 27
United Airlines Logo
6:00 am - 7:50 pm
SUX
-
ORD
13h 50m
1 stop
United Airlines Logo
3:50 pm - 5:41 pm
ORD
-
SUX
1h 51mnonstop
$368United Airlines
Sat, Feb 21 - Fri, Feb 27
United Airlines Logo
6:00 am - 6:54 pm
SUX
-
ORD
12h 54m
2 stops
United Airlines Logo
3:50 pm - 5:41 pm
ORD
-
SUX
1h 51mnonstop
$374United Airlines
Fri, Mar 6 - Thu, Mar 12
United Airlines Logo
6:30 pm - 11:19 am
SUX
-
ORD
16h 49m
1 stop
United Airlines Logo
3:50 pm - 5:41 pm
ORD
-
SUX
1h 51mnonstop
$376United Airlines
Thu, Feb 12 - Sat, Feb 14
United Airlines Logo
1:00 pm - 2:47 pm
SUX
-
ORD
1h 47mnonstop
United Airlines Logo
8:25 pm - 11:42 pm
ORD
-
SUX
27h 17m
2 stops
$378United Airlines
Sat, Jun 27 - Wed, Aug 19
United Airlines Logo
6:00 am - 9:13 pm
SUX
-
ORD
15h 13m
1 stop
United Airlines Logo
3:35 pm - 5:32 pm
ORD
-
SUX
1h 57mnonstop
$390United 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 $265 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 $265.

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 Sunday being the most expensive.

Find deals

Good to know

Low seasonNovember
Cheapest flight$204
Best time to beat the crowds with an average 34% drop in price.
Most popular time to fly with an average 5% increase in price.
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 afternoon, when round-trip flights cost $378 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 $444.

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 $190 one-way - $326 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 9180 reviews
7.3Comfort
8.1Crew
7.7Boarding
6.6Food
7.1Entertainment
Airline reviews

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

10.0 ExcellentDr. Joseph, Jan 2026
EWR - ORD
Read more United Airlines reviews

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

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

Information on your arrival and departure airports

Sioux City (SUX)