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Illinois

$115+ Cheap flights from South Dakota to Illinois

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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — ORD
Jun 10 — Jun 171
Wed 6/10
Wed 6/17
1 adult, Economy
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Cheap flight deals from South Dakota to Illinois

Cheapest flights from South Dakota to Illinois
Explore the most affordable flight options available from South Dakota to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 11, 2026.

This American Airlines deal was found by Cheapflights users on 5/10. 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 8/2612:19 pm
RAP
-
ORD
Nonstop2h 30m
American Airlines
Sat 8/291:25 pm
ORD
-
RAP
Nonstop2h 31m
American Airlines
Deal found 5/10$191
This American Airlines deal was found by Cheapflights users on 5/10. 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 7/15:00 pm
RAP
-
ORD
1 stop6h 39m
American Airlines
Sat 7/41:20 pm
ORD
-
RAP
Nonstop2h 35m
American Airlines
Deal found 5/10$201
This United Airlines deal was found by Cheapflights users on 5/10. 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.
Wed 7/16:00 am
RAP
-
ORD
Nonstop2h 34m
United Airlines
Sat 7/49:30 pm
ORD
-
RAP
Nonstop2h 46m
United Airlines
Deal found 5/10$207
This United Airlines deal was found by Cheapflights users on 5/10. 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.
Tue 6/94:40 pm
RAP
-
ORD
1 stop5h 09m
United Airlines
Tue 6/165:00 am
ORD
-
RAP
1 stop5h 20m
United Airlines
Deal found 5/10$211
This Delta deal was found by Cheapflights users on 5/10. 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 7/14:28 pm
RAP
-
ORD
1 stop3h 57m
Delta
Sat 7/47:01 am
ORD
-
RAP
2 stops9h 47m
Delta
Deal found 5/10$216
This Delta deal was found by Cheapflights users on 5/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:00 pm
RAP
-
ORD
1 stop4h 34m
Delta
Wed 12/99:30 am
ORD
-
RAP
1 stop7h 16m
Delta
Deal found 5/6$221
This Delta deal was found by Cheapflights users on 5/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:30 am
RAP
-
MDW
1 stop4h 20m
Delta
Tue 12/89:55 am
MDW
-
RAP
1 stop6h 51m
Delta
Deal found 5/6$221
This United Airlines deal was found by Cheapflights users on 5/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/171:35 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Sun 6/289:30 pm
ORD
-
RAP
Nonstop2h 46m
United Airlines
Deal found 5/6$222
This Delta deal was found by Cheapflights users on 5/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/66:50 am
RAP
-
ORD
2 stops8h 39m
Delta
Wed 6/1012:27 pm
ORD
-
RAP
1 stop4h 22m
Delta
Deal found 5/6$226
This American Airlines deal was found by Cheapflights users on 5/7. 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 8/293:26 pm
RAP
-
ORD
Nonstop2h 37m
American Airlines
Tue 9/19:45 am
ORD
-
RAP
Nonstop2h 30m
American Airlines
Deal found 5/7$231
This Delta deal was found by Cheapflights users on 5/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:30 am
RAP
-
MDW
2 stops9h 15m
Delta
Wed 12/99:30 am
MDW
-
RAP
2 stops7h 16m
Delta
Deal found 5/6$231
This United Airlines deal was found by Cheapflights users on 5/10. 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 6/181:35 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Tue 6/235:00 am
ORD
-
RAP
1 stop5h 20m
United Airlines
Deal found 5/10$232

Find flight deals from South Dakota to Illinois

Keep the following information in mind while searching for South Dakota to Illinois flight deals. Data was last updated May 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(American Airlines)

One-way from

$115
(Mytrip)

Popular in

March

Cheapest in

January

Average price

$284

Good round-trip deal

$343 or less

Good one-way deal

$245 or less
Provider with most accurate pricing for Sioux Falls Joe Foss Field-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sioux Falls Joe Foss Field-Chicago (CHI) flights.
Search Deals
From South Dakota to Illinois
Search Deals
One-way flight from South Dakota to Illinois
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($8 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from South Dakota to Illinois.
Search Deals
Price to beat on a one-way flight from South Dakota to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from South Dakota to Illinois 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 May 11, 2026.
Use the filters below to find and compare flights from South Dakota to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 7/1

6:00 am-9:34 am

Nonstop2h 34m

Chicago O'Hare Intl

Sat 7/4

9:30 pm-11:16 pm

Nonstop2h 46m

$207

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 6/18

1:35 pm-4:59 pm

Nonstop2h 24m

Chicago O'Hare Intl

Tue 6/23

5:00 am-9:20 am

1 stop5h 20m

$232

Sioux FallsSt. Louis

FSD - STL

FSDSTL

Sioux Falls Joe Foss Field

Fri 7/17

8:14 pm-7:23 pm

1 stop23h 09m

Lambert-St Louis

Sun 7/19

8:08 pm-7:23 pm

1 stop23h 15m

$239
Quickest round-trip

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Fri 9/11

7:40 am-9:31 am

Nonstop1h 51m

Chicago O'Hare Intl

Sun 9/13

8:00 pm-9:52 pm

Nonstop1h 52m

$249

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 6/18

1:35 pm-4:59 pm

Nonstop2h 24m

Chicago O'Hare Intl

Sun 6/28

9:30 pm-11:16 pm

Nonstop2h 46m

$253

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Tue 6/16

4:26 pm-9:25 pm

1 stop4h 59m

Chicago O'Hare Intl

Tue 7/7

6:30 am-10:15 am

1 stop3h 45m

$269

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Tue 6/30

1:53 pm-8:31 pm

2 stops6h 38m

Chicago O'Hare Intl

Mon 7/6

6:30 am-10:16 am

1 stop3h 46m

$274

Sioux FallsSt. Louis

FSD - STL

FSDSTL

Sioux Falls Joe Foss Field

Wed 6/3

6:51 pm-11:57 pm

1 stop5h 06m

Lambert-St Louis

Wed 6/10

5:10 am-10:38 am

1 stop5h 28m

$280

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 6/10

5:53 pm-12:44 am

1 stop5h 51m

Chicago O'Hare Intl

Sat 6/13

9:30 pm-11:16 pm

Nonstop2h 46m

$281

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 7/16

6:48 am-6:29 pm

2 stops10h 41m

Chicago O'Hare Intl

Sun 7/19

2:07 pm-10:26 pm

2 stops9h 19m

$283

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/9

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from South Dakota to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from South Dakota 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 South Dakota to Illinois

How far ahead should I book a flight from South Dakota to Illinois?

The price you pay for your flight from South Dakota to Illinois may vary depending on when you book. For the best chance of a lower fare, look to book 83 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, April is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $151). Flying from South Dakota to Illinois in January is currently the most expensive (average of $189). 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 SD to IL?

Find hourly flight availability from South Dakota to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 11, 2026.

It’s typically best to fly out from South Dakota to Illinois at noon. Doing so could potentially save you 23% on the flight price compared to flying in the afternoon, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from South Dakota to Illinois. Price data was last updated on May 9, 2026.

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

Weekly flight availability from South Dakota to Illinois

Explore weekly flight availability from South Dakota to Illinois. 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 May 11, 2026.

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

How much does it cost to fly round-trip from South Dakota to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated May 11, 2026.
Read through reviews of airlines operating flights from South Dakota to Illinois, such as Denver Air Connection,Delta, andUnited Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Denver Air Connection
8.1
Very good

Boarding

8.2

Entertainment

7.6

Food

8.2

Comfort

8.6

Crew

9.1

Overall

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

Boarding

8.2

Entertainment

7.6

Food

8.2

Comfort

8.6

Crew

9.1

Overall

8.1
Delta
7.9
Good
8,453 reviews
Denver Air Connection
8.1
Very good

Boarding

8.2

Entertainment

7.6

Food

8.2

Comfort

8.6

Crew

9.1

Overall

8.1
United Airlines
7.4
Good
9,700 reviews
Denver Air Connection
8.1
Very good

Boarding

8.2

Entertainment

7.6

Food

8.2

Comfort

8.6

Crew

9.1

Overall

8.1
American Airlines
7.1
Good
11,664 reviews
Denver Air Connection
8.1
Very good

Boarding

8.2

Entertainment

7.6

Food

8.2

Comfort

8.6

Crew

9.1

Overall

8.1

Related info for your journey

Find useful and relevant information for your journey from South Dakota to Illinois. 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 South Dakota to Illinois?

    Airlines like United Airlines, Frontier, and Delta fly from South Dakota to Illinois in about 2h 34m. The time it takes to get you to your destination can typically vary by up to 20h 35m. Airlines will cover a distance of 777 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from South Dakota to Illinois one-way?

    One-way options have recently been found by users for as low as $83 on Denver Air Connection. Other airlines that offer cheap prices include American Airlines from $143 and United Airlines from $144 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from South Dakota to Illinois 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 South Dakota to Illinois?

    Currently, April is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $151). Flying from South Dakota to Illinois in January is currently the most expensive (average of $189). 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 South Dakota to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from South Dakota to Illinois

Discover the top 2 airlines that operate flights from South Dakota to Illinois. 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 May 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$187Average$244FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$189Average$316FlexibilityNo cancel feeOn-time69%

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