$186 Find Cheap Flights from Sioux City to Illinois - Compare and Save

1 adult
1 adult, Economy, 0 bags

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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?

The cheapest ticket to Illinois from Sioux City found in the last 5 days was to Chicago, at $244 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 5 days was $244.

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 $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 $521.

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

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

Good to know

Cheapest flight

$186
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 $185 one-way - $445 round-trip

Reviews of the top airline flying from Sioux City to Illinois

 
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.
7.3
United AirlinesOverall score based on 10388 reviews
7.1Entertainment
6.7Food
7.7Boarding
7.3Comfort
8.1Crew
Airline reviews

Takeoff delayed 2 hrs. Boarded on time to find we were missing part of the flight crew. Then informed that they had loaded too much fuel. Spent 1 1/2 hrs sitting there burning off the excess, which included a couple of laps around the runway until we were light enough to fly! Ridiculous!

2.0 MediocreAnonymous, Oct 2026
Read more United Airlines reviews

Takeoff delayed 2 hrs. Boarded on time to find we were missing part of the flight crew. Then informed that they had loaded too much fuel. Spent 1 1/2 hrs sitting there burning off the excess, which included a couple of laps around the runway until we were light enough to fly! Ridiculous!

Requested for warm or hot water because of throat pain, it was denied. The entertainment system was hung, requested the crew to turn it off, instead of turning it off they rebooted the device. It was stuck again, no one bothered to check.

Horrible on the chicago end. They change hates then there is a plane at the new gate so we can’t pull in. Then that plane has mechanical issue and needs to be pulled back to the gate but we can’t get to another new gate due the other plane being in the way. Horrible gate management which will cause many customers to miss connections.

Fantastic experience once again flying with United! There was great communication from the cockpit and one of the flight attendants went out of her way to get my two little kids some special treats which elevated our travel experience coming home.

The employees seemed impatient with their guests. It seemed like they were giving us orders, instead of easily assisting. Our flight was delayed waiting on a flight attendant. It was alright.

My easiest trip ever. Flights left on time, and came in a few minutes early. The flights weren’t full so it was very comfortable. Thank you United

Quinoa chocolate cookies are my favorite! Would be nice to have internet service like American

1 flight cancelled Had to fly out of different city Flight at new departure city was delayed 3 hours causing us to miss connecting flights. By the time we did make it to Prague our luggage did not. Had to wait day and a half for luggage to be delivered. Customer service was not good. Agents did not arrive at gate until 5-10 minutes before boarding

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.

I had requested wheelchair assistance prior to flight. The airport staff had no record of it. It was not provided at Cedar Rapids which was a small airport, so I managed on my own. At O'Hare airport the same thing happened. The staff told me they had no record of my request for a wheel chair. But they finally provided it after a delay when I insisted that I needed it.

More options for your flight from Sioux City to Illinois

Complete your trip to Illinois with a hotel stay or car rental