$265 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 3/6. 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

Fri, Mar 6 - Thu, Mar 12
United Airlines Logo
12:53 pm - 2:40 pmSUX-ORD
1h 47mnonstop
United Airlines Logo
3:50 pm - 5:41 pmORD-SUX
1h 51mnonstop
$265United Airlines
Find Deal
Wed, Dec 17 - Wed, Dec 24
United Airlines Logo
7:50 am - 9:37 amSUX-ORD
1h 47mnonstop
United Airlines Logo
9:18 pm - 11:15 pmORD-SUX
1h 57mnonstop
$355United Airlines
Find Deal
Fri, Feb 13 - Sun, Feb 15
United Airlines Logo
1:00 pm - 2:47 pmSUX-ORD
1h 47mnonstop
United Airlines Logo
9:20 am - 11:42 pmORD-SUX
14h 22m2 stops
$383United Airlines
Find Deal
Fri, Mar 6 - Thu, Mar 12
United Airlines Logo
6:30 pm - 11:19 amSUX-ORD
16h 49m1 stop
United Airlines Logo
3:50 pm - 5:41 pmORD-SUX
1h 51mnonstop
$391United Airlines
Find Deal
Fri, Mar 6 - Thu, Mar 12
United Airlines Logo
6:10 am - 9:56 pmSUX-ORD
15h 46m2 stops
United Airlines Logo
3:50 pm - 5:41 pmORD-SUX
1h 51mnonstop
$416United Airlines
Find Deal
Thu, Mar 12 - Sun, Mar 15
United Airlines Logo
6:10 am - 11:52 pmSUX-ORD
17h 42m1 stop
United Airlines Logo
3:50 pm - 5:41 pmORD-SUX
1h 51mnonstop
$432United Airlines
Find Deal
Wed, Dec 17 - Wed, Dec 24
United Airlines Logo
6:52 pm - 9:44 amSUX-ORD
14h 52m1 stop
United Airlines Logo
9:18 pm - 11:15 pmORD-SUX
1h 57mnonstop
$442United Airlines
Find Deal
Wed, Dec 10 - Sun, Dec 14
United Airlines Logo
6:52 pm - 7:41 amSUX-ORD
12h 49m2 stops
United Airlines Logo
9:10 pm - 10:59 pmORD-SUX
1h 49mnonstop
$451United Airlines
Find Deal
Sat, Apr 18 - Wed, Apr 22
United Airlines Logo
12:45 pm - 2:40 pmSUX-ORD
1h 55mnonstop
United Airlines Logo
10:35 am - 11:42 pmORD-SUX
13h 07m2 stops
$457United Airlines
Find Deal
Sat, Apr 18 - Wed, Apr 22
United Airlines Logo
6:30 pm - 7:44 amSUX-ORD
13h 14m2 stops
United Airlines Logo
3:35 pm - 5:32 pmORD-SUX
1h 57mnonstop
$462United 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 $303 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 $303.

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.

Good to know

Low seasonJune
Cheapest flight$265
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly and prices are also 21% 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 $447 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 $447.

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 $268 one-way - $373 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 9050 reviews
7.3Comfort
7.1Entertainment
6.6Food
7.7Boarding
8.1Crew
Airline reviews

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.

10.0 ExcellentJeremy, Nov 2025XNA - ORD
Read more United Airlines reviews

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.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

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.

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

Information on your arrival and departure airports