$101 Find Cheap Flights from Sioux Falls 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 Falls to Illinois departing on 5/4. 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 Falls 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 Falls to Illinois, as well as popular online travel agencies
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Cheap Flights from Sioux Falls to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$177
Bloomington
Bloomington1 stop$309
St. Louis
St. Louis1 stop$249
Chicago
Chicago1 stop$177
Bloomington
Bloomington1 stop$309
St. Louis
St. Louis1 stop$249

Book Cheap Sioux Falls 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 Falls 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 Falls to Illinois

Wed, Apr 15 - Sat, Apr 18
Delta Logo
1:44 pm - 6:36 pm
FSD
-
MDW
4h 52m
1 stop
Delta Logo
7:16 pm - 11:02 pm
MDW
-
FSD
3h 46m
1 stop
$177Delta
Wed, Apr 15 - Sat, Apr 18
Delta Logo
1:44 pm - 6:13 pm
FSD
-
ORD
4h 29m
1 stop
Delta Logo
7:07 pm - 11:02 pm
ORD
-
FSD
3h 55m
1 stop
$177Delta
Thu, May 7 - Sun, May 10
Delta Logo
8:19 am - 6:33 pm
FSD
-
MDW
10h 14m
2 stops
Delta Logo
9:23 am - 12:49 pm
MDW
-
FSD
3h 26m
1 stop
$182Delta
Thu, May 7 - Sun, May 10
Delta Logo
8:19 am - 6:05 pm
FSD
-
ORD
9h 46m
2 stops
Delta Logo
8:42 am - 12:49 pm
ORD
-
FSD
4h 07m
1 stop
$182Delta
Thu, May 7 - Sun, May 10
Delta Logo
8:19 am - 6:05 pm
FSD
-
ORD
9h 46m
2 stops
Delta Logo
2:00 pm - 11:11 pm
ORD
-
FSD
9h 11m
2 stops
$187Delta
Fri, Mar 27 - Sun, Mar 29
United Airlines Logo
6:35 pm - 8:25 pm
FSD
-
ORD
1h 50mnonstop
United Airlines Logo
7:58 pm - 9:49 pm
ORD
-
FSD
1h 51mnonstop
$189United Airlines
Fri, Jun 12 - Sun, Jun 14
United Airlines Logo
5:00 am - 6:58 am
FSD
-
ORD
1h 58mnonstop
United Airlines Logo
7:40 pm - 9:38 pm
ORD
-
FSD
1h 58mnonstop
$203United Airlines
Thu, Mar 26 - Sun, Mar 29
American Airlines Logo
7:42 pm - 9:30 pm
FSD
-
ORD
1h 48mnonstop
American Airlines Logo
11:45 am - 1:36 pm
ORD
-
FSD
1h 51mnonstop
$209American Airlines
Fri, May 8 - Sun, May 10
American Airlines Logo
7:39 pm - 11:56 pm
FSD
-
STL
4h 17m
1 stop
American Airlines Logo
5:20 am - 12:56 pm
STL
-
FSD
7h 36m
1 stop
$274American Airlines
Tue, Mar 24 - Tue, Mar 31
Multiple Airlines Logo
11:01 am - 9:49 am
FSD
-
STL
22h 48m
2 stops
Multiple Airlines Logo
12:14 pm - 1:45 pm
STL
-
FSD
25h 31m
1 stop
$426Multiple Airlines
Booking Insights

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

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

What is the cheapest Sioux Falls 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 Falls found in the last 72 hours was to Chicago, at $270 round-trip. The most popular route is from Sioux Falls (FSD) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $270.

Can I save money by flying with a layover from Sioux Falls to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $334, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Sioux Falls to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Sioux Falls to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Sioux Falls to Illinois is September, when tickets cost $246 (return) on average. On the other hand, the most expensive months are March and November, when the average cost of round-trip tickets is $335 and $319 respectively.

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

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

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

How far in advance should I book a flight from Sioux Falls to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Sioux Falls to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Sioux Falls to Illinois, you should book around 3 weeks before departure, which saves you about 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 18 weeks before departure.

Good to know

Low seasonNovember
Cheapest flight$101
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from Sioux Falls to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Sioux Falls 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 Falls to Illinois.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Sioux Falls 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 Falls 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 Falls 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 Falls 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 Falls 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 at night, when round-trip flights cost $375 on average. Morning departures are around 10% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the evening, which is peak travel time and where the average cost of a ticket is $492.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Sioux Falls to the following destinations at these prices or less: Chicago $304 one-way - $361 round-trip

Reviews of the top airlines flying from Sioux Falls to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Sioux Falls 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 Falls 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 9377 reviews
7.3Comfort
7.1Entertainment
6.6Food
8.1Crew
7.7Boarding
Airline reviews

Wonderful. Quick boarding. Early departure and we arrived 30 minutes early at our destination. Unfortunately, when you arrive early, there is still a departing aircraft at our gate. We had to park for 30 minutes until the gate was clear. So our early arrival was not really early at the gate. Otherwise it was a quick and smooth flight. Appreciated the efficiency.

10.0 ExcellentDr. Joseph, Feb 2026
DCA - ORD
Read more United Airlines reviews

Wonderful. Quick boarding. Early departure and we arrived 30 minutes early at our destination. Unfortunately, when you arrive early, there is still a departing aircraft at our gate. We had to park for 30 minutes until the gate was clear. So our early arrival was not really early at the gate. Otherwise it was a quick and smooth flight. Appreciated the efficiency.

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

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

The chicken wrap was tiny ($13 for what looked like a 1/3 of a normal wrap?) and disgusting.

It was good experience this time. The flight was on time.

There was a delay with the plan which cause the flight to leave later and once arrived in Chicago there was another delay and some passengers missed their connecting flights

The gate agent had a really bad attitude and refused to help me get on the standby list. She just handed me a card and said I needed to call a number. I asked her to help with the AA app on my phone and she just shrugged and said she didnt know. After a few phone calls, I eventually just went to a different gate agent on the other side of the terminal and got the help I needed.

Overall, my last three trips on American Airlines have all been either delayed or "rescheduled" due to mechanical issues. At least on delay caused me to miss two possible connecting flights each later than the first. My last option for my last connection required the assistance of the onsite service desk (O'Hare Airport). The wait time for the service desk was such that it jeopardized getting booked on the last connecting flight available for the night. Suffice it to say, my latest experiences with American Airlines have caused me extensive loss of productive business and personal time and can therefore be classified as significantly less than satisfactory.

Waiting for gate in RDU for more than 20mins is crazy.

American Airlines was great and worked very hard to change my ticket so I could get an earlier, direct flight back to Dallas. However, I was informed that Kayak made mistakes with my itinerary and classified my ticket as desiring to be on the earlier flight instead of taking the necessary step of calling AA to get me on the standby list. This ended up keeping me from being added to the standby list and delayed me getting home by 6 hours. I am happy to discuss this further with Kayak so they can correct their procedures so this won't happen again.

Waited for oxygen tanks for 30 minutes after boarding was complete.

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

Update to handle the delay was very bad, crews no smiles or welcome or thanks. Don’t care attitude

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

Information on your arrival and departure airports