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South Dakota

$107+ Cheap flights from Illinois to South Dakota

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — FSD
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
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Cheap flight deals from Illinois to South Dakota

Keep the following information in mind while searching for Illinois to South Dakota flight deals. Data was last updated January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$168
(Kiwi.com)

One-way from

$107
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$244

Good round-trip deal

$189 or less

Good one-way deal

$213 or less
Provider with most accurate pricing for Chicago (CHI)-Sioux Falls Joe Foss Field flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Sioux Falls Joe Foss Field flights.
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From Illinois to South Dakota
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One-way flight from Illinois to South Dakota
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Highest demand for flights based on searches. 5% potential increase in price ($15 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Price to beat on a round-trip flight from Illinois to South Dakota.
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Price to beat on a one-way flight from Illinois to South Dakota.
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Find flight deals from Illinois to South Dakota

Cheapest flights from Illinois to South Dakota
Explore the most affordable flight options available from Illinois to South Dakota. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 8, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/212:51 pmSTL - FSD
1 stop22h 30mFrontier
Sun 3/12:16 pmFSD - STL
1 stop22h 53mFrontier
Deal found 1/7$168
This United Airlines deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/297:58 pmORD - FSD
Nonstop1h 52mUnited Airlines
Sun 2/17:30 amFSD - ORD
Nonstop2h 02mUnited Airlines
Deal found 1/7$189
This American Airlines deal was found by Cheapflights users on 1/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/299:50 amORD - FSD
Nonstop2h 01mAmerican Airlines
Sun 2/16:15 pmFSD - ORD
Nonstop1h 58mAmerican Airlines
Deal found 1/6$190
This United Airlines deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/58:11 pmORD - FSD
Nonstop1h 52mUnited Airlines
Sun 3/87:43 amFSD - ORD
Nonstop1h 52mUnited Airlines
Deal found 1/7$199
This United Airlines deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/238:45 amORD - FSD
Nonstop2h 02mUnited Airlines
Thu 1/297:30 amFSD - ORD
Nonstop2h 02mUnited Airlines
Deal found 1/7$204
This American Airlines deal was found by Cheapflights users on 1/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/242:50 pmORD - FSD
Nonstop1h 50mAmerican Airlines
Sun 9/276:00 pmFSD - ORD
Nonstop1h 50mAmerican Airlines
Deal found 1/5$209
This American Airlines deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1211:00 amORD - RAP
Nonstop2h 30mAmerican Airlines
Wed 8/196:10 pmRAP - ORD
Nonstop2h 19mAmerican Airlines
Deal found 1/7$209
This Delta deal was found by Cheapflights users on 1/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/116:45 pmMDW - FSD
1 stop4h 01mDelta
Sun 7/125:15 amFSD - MDW
1 stop3h 23mDelta
Deal found 1/8$209
This Delta deal was found by Cheapflights users on 1/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/46:50 amORD - FSD
2 stops8h 44mDelta
Wed 2/111:07 pmFSD - ORD
1 stop4h 48mDelta
Deal found 1/5$214
This Delta deal was found by Cheapflights users on 1/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/311:00 pmMDW - FSD
2 stops9h 46mDelta
Sun 8/25:15 amFSD - MDW
1 stop3h 23mDelta
Deal found 1/8$214
This American Airlines deal was found by Cheapflights users on 1/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/293:52 pmORD - RAP
1 stop6h 07mAmerican Airlines
Sat 9/56:10 pmRAP - ORD
Nonstop2h 19mAmerican Airlines
Deal found 1/7$219
This Delta deal was found by Cheapflights users on 1/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/236:45 pmORD - FSD
1 stop4h 19mDelta
Thu 1/291:02 pmFSD - ORD
1 stop4h 53mDelta
Deal found 1/8$224

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to South Dakota that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 8, 2026.
Use the filters below to find and compare flights from Illinois to South Dakota that are best for you.

Fly from

Illinois

Fly to

South Dakota

Route

Depart

Return

Price

St. LouisSioux Falls

STL - FSD

STLFSD

Lambert-St Louis

Sat 2/21

2:51 pm-1:21 pm

1 stop22h 30m

Sioux Falls Joe Foss Field

Sun 3/1

2:16 pm-1:09 pm

1 stop22h 53m

$168

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Wed 3/25

8:10 pm-10:02 pm

Nonstop1h 52m

Sioux Falls Joe Foss Field

Sun 3/29

6:29 pm-8:26 pm

Nonstop1h 57m

$189

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Thu 1/29

9:50 am-11:51 am

Nonstop2h 01m

Sioux Falls Joe Foss Field

Sun 2/1

6:15 pm-8:13 pm

Nonstop1h 58m

$190

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Thu 3/5

8:11 pm-10:03 pm

Nonstop1h 52m

Sioux Falls Joe Foss Field

Sun 3/8

7:43 am-9:35 am

Nonstop1h 52m

$199

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Fri 1/23

8:45 am-10:47 am

Nonstop2h 02m

Sioux Falls Joe Foss Field

Thu 1/29

7:30 am-9:32 am

Nonstop2h 02m

$204

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Thu 3/19

6:00 am-12:53 pm

1 stop6h 53m

Sioux Falls Joe Foss Field

Sun 3/22

8:00 am-11:35 am

1 stop3h 35m

$209

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Fri 1/30

6:15 am-10:22 am

1 stop4h 07m

Sioux Falls Joe Foss Field

Sat 1/31

4:17 pm-9:43 pm

1 stop5h 26m

$209

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Thu 3/5

6:15 am-10:08 am

1 stop3h 53m

Sioux Falls Joe Foss Field

Sun 3/8

1:34 pm-7:49 pm

1 stop6h 15m

$209

ChicagoSioux Falls

ORD - FSD

ORDFSD

Chicago O'Hare Intl

Wed 3/18

7:00 pm-10:59 pm

1 stop3h 59m

Sioux Falls Joe Foss Field

Sun 3/22

8:00 am-11:35 am

1 stop3h 35m

$209

ChicagoSioux Falls

MDW - FSD

MDWFSD

Chicago Midway

Wed 3/25

7:20 pm-10:59 pm

1 stop3h 39m

Sioux Falls Joe Foss Field

Sun 3/29

8:00 am-5:54 pm

2 stops9h 54m

$214

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/7

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to South Dakota

Have a flexible travel schedule? Discover the best time to fly to South Dakota from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to South Dakota

What is the cheapest month to book a flight from Illinois to South Dakota?

Currently, February is the cheapest month in which you can book a flight from Illinois to South Dakota (average of $189). Flying from Illinois to South Dakota in April is currently the most expensive (average of $218). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to SD?

Find hourly flight availability from Illinois to South Dakota. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 8, 2026.

One of the essential ways to save on airfare from Illinois to South Dakota is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 28% on airfare.

What is the cheapest day to fly from Illinois to South Dakota?

Use this chart to determine the cheapest time to fly round-trip from Illinois to South Dakota. Price data was last updated on January 3, 2026.

Travelers seeking maximum savings on their Illinois to South Dakota flight should consider departing on Wednesday at noon when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Illinois to South Dakota

Explore weekly flight availability from Illinois to South Dakota. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 8, 2026.

The most flights from USIL to USSD are scheduled on a Monday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

Reviews of airlines servicing South Dakota

Get insights into the airlines that provide service to South Dakota. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to South Dakota. Reviews last updated January 8, 2026.
Read reviews from past customers who have flown Denver Air Connection, Delta, and United Airlines from Illinois to South Dakota. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Denver Air Connection
8.7
Very good

Crew

9.4

Overall

8.7

Food

8.4

Comfort

8.9

Boarding

8.7

Entertainment

8.1
Denver Air Connection
8.7
Very good
Denver Air Connection
8.7
Very good

Crew

9.4

Overall

8.7

Food

8.4

Comfort

8.9

Boarding

8.7

Entertainment

8.1
Delta
7.9
Good
8,032 reviews
Denver Air Connection
8.7
Very good

Crew

9.4

Overall

8.7

Food

8.4

Comfort

8.9

Boarding

8.7

Entertainment

8.1
United Airlines
7.4
Good
9,143 reviews
Denver Air Connection
8.7
Very good

Crew

9.4

Overall

8.7

Food

8.4

Comfort

8.9

Boarding

8.7

Entertainment

8.1
American Airlines
7.2
Good
11,097 reviews
Denver Air Connection
8.7
Very good

Crew

9.4

Overall

8.7

Food

8.4

Comfort

8.9

Boarding

8.7

Entertainment

8.1

Related info for your journey

Find useful and relevant information for your journey from Illinois to South Dakota. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to South Dakota?

    Frontier, United Airlines, and American Airlines can get you from Illinois to South Dakota in just under 1h 52m. Your travel time can differ by up to 20h 38m. There are 461 mi between Illinois and South Dakota. This flight may include one or multiple stops.

  • Can I find deals for flights from Illinois to South Dakota that include hotel bookings?

    Yes. In addition to deals on Illinois to South Dakota flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to South Dakota?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to South Dakota.

  • Can I find deals for business class flights from Illinois to South Dakota?

    Yes. Cheapflights offers flight deals from Illinois to South Dakota by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to South Dakota?

    Currently, February is the cheapest month in which you can book a flight from Illinois to South Dakota (average of $189). Flying from Illinois to South Dakota in April is currently the most expensive (average of $218). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Illinois to South Dakota

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Illinois to South Dakota

Discover the top 4 airlines that operate flights from Illinois to South Dakota. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
Denver Air ConnectionCheapest$164Average$196FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$189Average$278FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$194Average$399FlexibilityNo cancel feeOn-time69%
DeltaCheapest$228Average$298FlexibilityNo cancel feeOn-timeN/A

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