$103 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 5/8. 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$167
Bloomington
Bloomington1 stop$491
St. Louis
St. Louis1 stop$269
Chicago
Chicago1 stop$167
Bloomington
Bloomington1 stop$491
St. Louis
St. Louis1 stop$269

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

ث, أبريل 21 - س, أبريل 25
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
$167Delta
خ, أبريل 30 - س, مايو 9
Delta Logo
8:05 am - 11:34 am
FSD
-
ORD
3h 29m
1 stop
Delta Logo
5:43 pm - 10:57 pm
ORD
-
FSD
5h 14m
1 stop
$167Delta
ث, أبريل 21 - س, أبريل 25
Delta Logo
5:05 am - 12:43 pm
FSD
-
MDW
7h 38m
2 stops
Delta Logo
7:16 pm - 11:02 pm
MDW
-
FSD
3h 46m
1 stop
$172Delta
خ, أبريل 30 - س, مايو 9
Delta Logo
8:05 am - 11:34 am
FSD
-
ORD
3h 29m
1 stop
Delta Logo
1:44 pm - 10:57 pm
ORD
-
FSD
9h 13m
2 stops
$172Delta
ج, أبريل 3 - ث, أبريل 7
American Airlines Logo
12:14 pm - 2:02 pm
FSD
-
ORD
1h 48mnonstop
American Airlines Logo
5:11 pm - 7:09 pm
ORD
-
FSD
1h 58mnonstop
$189American Airlines
ج, مارس 27 - ج, أبريل 3
American Airlines Logo
7:42 pm - 9:30 pm
FSD
-
ORD
1h 48mnonstop
American Airlines Logo
9:47 am - 11:38 am
ORD
-
FSD
1h 51mnonstop
$190American Airlines
س, مارس 7 - ح, مارس 8
United Airlines Logo
7:43 am - 9:35 am
FSD
-
ORD
1h 52mnonstop
United Airlines Logo
8:10 pm - 10:02 pm
ORD
-
FSD
1h 52mnonstop
$203United Airlines
ر, فبراير 25 - س, مارس 28
United Airlines Logo
11:21 am - 1:15 pm
FSD
-
ORD
1h 54mnonstop
United Airlines Logo
8:10 pm - 10:02 pm
ORD
-
FSD
1h 52mnonstop
$204United Airlines
ح, مارس 1 - ر, مارس 4
Frontier Logo
2:16 pm - 1:09 pm
FSD
-
STL
22h 53m
1 stop
Frontier Logo
5:18 pm - 1:21 pm
STL
-
FSD
20h 03m
1 stop
$293Frontier
ح, مارس 1 - ر, مارس 4
Frontier Logo
2:16 pm - 1:09 pm
FSD
-
STL
22h 53m
1 stop
Frontier Logo
8:17 pm - 1:21 pm
STL
-
FSD
17h 04m
2 stops
$304Frontier
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.

How much is a round-trip flight from Sioux Falls to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Sioux Falls to Illinois departing in April.

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 $265 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 $265.

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 $308, 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 $340 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 37% 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$103
Best time to beat the crowds but there is an average 16% increase in price.
Most popular time to fly with an average 19% increase in price.
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 in the afternoon, when round-trip flights cost $364 on average. Morning departures are around 11% 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 $497.

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 $280 one-way - $339 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 9273 reviews
7.7Boarding
8.1Crew
6.6Food
7.3Comfort
7.1Entertainment
Airline reviews

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.

10.0 ExcellentYesica, Feb 2026
CHS - ORD
Read more United Airlines reviews

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

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

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

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

Little warm on the plane and delayed for an hour

So excited very proud first of all I wanna thank kayak all updates very professional and fast alart And amazing cabin crew so nice to me they deserve big salute

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

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

Information on your arrival and departure airports