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$61+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
FSD — ORD
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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Cheap flight deals from South Dakota to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from South Dakota (USSD) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2025.

Round-trip from

$189
(United Airlines)

One-way from

$61
(Frontier)

Good round-trip deal

$190 or less

Good one-way deal

$249 or less
From South Dakota to Illinois
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One-way flight from South Dakota to Illinois
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Price to beat on a round-trip flight from South Dakota to Illinois.
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Price to beat on a one-way flight from South Dakota to Illinois.
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Find 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 January 21, 2025.

This United Airlines deal was found by Cheapflights users on 1/21. 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 2/186:38 pmFSD - ORD
Nonstop1h 47mUnited Airlines
Tue 2/258:20 pmORD - FSD
Nonstop1h 55mUnited Airlines
Deal found 1/21$189
This Delta deal was found by Cheapflights users on 1/20. 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.
Tue 2/46:59 pmFSD - STL
1 stop4h 10mDelta
Sat 2/86:00 amSTL - FSD
1 stop4h 24mDelta
Deal found 1/20$199
This Delta deal was found by Cheapflights users on 1/21. 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.
Thu 3/65:05 amFSD - ORD
1 stop3h 54mDelta
Sun 3/96:15 amORD - FSD
1 stop3h 53mDelta
Deal found 1/21$209
This American Airlines deal was found by Cheapflights users on 1/21. 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.
Tue 2/185:28 amFSD - ORD
Nonstop1h 47mAmerican Airlines
Tue 2/256:00 amORD - FSD
1 stop6h 47mAmerican Airlines
Deal found 1/21$229
This Delta deal was found by Cheapflights users on 1/21. 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.
Thu 2/201:18 pmFSD - MDW
1 stop4h 25mDelta
Mon 2/246:59 pmMDW - FSD
1 stop4h 08mDelta
Deal found 1/21$239
This Delta deal was found by Cheapflights users on 1/19. 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.
Tue 2/44:19 pmRAP - STL
1 stop5h 50mDelta
Sat 2/86:00 amSTL - RAP
1 stop6h 04mDelta
Deal found 1/19$259
This United Airlines deal was found by Cheapflights users on 1/20. 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 5/912:45 pmRAP - ORD
Nonstop2h 18mUnited Airlines
Sun 5/117:35 pmORD - RAP
Nonstop2h 39mUnited Airlines
Deal found 1/20$269
This United Airlines deal was found by Cheapflights users on 1/20. 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 2/511:26 amFSD - STL
1 stop4h 12mUnited Airlines
Mon 2/173:32 pmSTL - FSD
1 stop6h 43mUnited Airlines
Deal found 1/20$273
This Delta deal was found by Cheapflights users on 1/21. 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.
Thu 3/611:49 amRAP - MDW
1 stop4h 54mDelta
Tue 3/117:09 pmMDW - RAP
1 stop4h 25mDelta
Deal found 1/21$289
This Delta deal was found by Cheapflights users on 1/20. 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.
Thu 2/2011:49 amRAP - ORD
2 stops8h 04mDelta
Thu 2/276:15 amORD - RAP
1 stop5h 49mDelta
Deal found 1/20$294
This American Airlines deal was found by Cheapflights users on 1/21. 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 1/255:52 pmFSD - STL
1 stop5h 04mAmerican Airlines
Mon 1/276:00 pmSTL - FSD
1 stop4h 51mAmerican Airlines
Deal found 1/21$299
This Frontier deal was found by Cheapflights users on 1/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/142:51 pmFSD - ORD
1 stop9h 53mFrontier
Mon 3/176:30 amORD - FSD
1 stop7h 15mFrontier
Deal found 1/20$343

Find flights from South Dakota to Illinois within your budget

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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Tue 2/18

6:38 pm-8:25 pm

Nonstop1h 47m

Chicago O'Hare Intl

Tue 2/25

8:20 pm-10:15 pm

Nonstop1h 55m

$189

Sioux FallsSt. Louis

FSD - STL

FSDSTL

Sioux Falls Joe Foss Field

Tue 2/4

6:59 pm-11:09 pm

1 stop4h 10m

Lambert-St Louis

Sat 2/8

6:00 am-10:24 am

1 stop4h 24m

$199

Sioux FallsChicago

FSD - MDW

FSDMDW

Sioux Falls Joe Foss Field

Thu 3/6

5:05 am-9:35 am

1 stop4h 30m

Chicago Midway

Thu 3/13

10:25 am-3:43 pm

1 stop5h 18m

$209

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Thu 2/20

1:18 pm-5:29 pm

1 stop4h 11m

Chicago O'Hare Intl

Mon 2/24

7:10 pm-11:07 pm

1 stop3h 57m

$209

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Tue 2/18

5:28 am-7:15 am

Nonstop1h 47m

Chicago O'Hare Intl

Tue 2/25

6:00 am-12:47 pm

1 stop6h 47m

$229

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 2/4

4:19 pm-11:09 pm

1 stop5h 50m

Lambert-St Louis

Sat 2/8

6:00 am-11:04 am

1 stop6h 04m

$259

Sioux FallsSt. Louis

FSD - STL

FSDSTL

Sioux Falls Joe Foss Field

Wed 2/5

11:26 am-3:38 pm

1 stop4h 12m

Lambert-St Louis

Mon 2/17

3:32 pm-10:15 pm

1 stop6h 43m

$273

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 3/6

6:00 am-11:30 am

1 stop4h 30m

Chicago O'Hare Intl

Tue 3/11

6:15 am-11:04 am

1 stop5h 49m

$289

Rapid CityChicago

RAP - MDW

RAPMDW

Rapid City

Thu 3/6

11:49 am-5:43 pm

1 stop4h 54m

Chicago Midway

Tue 3/11

7:09 pm-10:34 pm

1 stop4h 25m

$289

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Tue 4/1

7:30 pm-12:53 pm

2 stops17h 23m

Chicago O'Hare Intl

Tue 4/8

7:21 pm-9:53 am

1 stop14h 32m

$394

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 27 results
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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.

Travel insights for flights from South Dakota to Illinois

Get recent, data-driven insights about flights from South Dakota to Illinois including ideal travel times, pricing trends, and more.

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

Currently, August is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $245). Flying from South Dakota to Illinois in March is currently the most expensive (average of $320). 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 January 21, 2025.

When flying from South Dakota to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 January 21, 2025.

The most flights from USSD to USIL are scheduled on a Monday (14 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (8 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 January 21, 2025.
Get a feel of what it's like to fly with Delta, United Airlines and American Airlines from South Dakota to Illinois by reading reviews from past customers. 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.
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines
7.4
Good
8,985 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Frontier
6.1
Okay
3,443 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • 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 $61 on Frontier. Other airlines that offer cheap prices include Delta from $198 and United Airlines from $209 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, August is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $245). Flying from South Dakota to Illinois in March is currently the most expensive (average of $320). 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 4 airlines flying from South Dakota to Illinois

Discover the top 4 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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Denver Air ConnectionCheapest$153Average$199FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$184Average$275FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$193Average$350FlexibilityNo cancel feeOn-time69%
DeltaCheapest$228Average$338FlexibilityNo cancel feeOn-timeN/A
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