$131+ 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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
FSD — ORD
Aug 1 — Aug 81
Round-trip
1 adult, Economy
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Cheapest flights from South Dakota to IllinoisExplore 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 July 2, 2026.
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 July 2, 2026.
This CheapOair deal was found by Cheapflights users on 6/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:08 pm
FSD
- ORD
1 stop24h 44m
Frontier
Tue 8/49:57 pm
ORD
- FSD
1 stop21h 26m
Frontier
Deal found 6/27![Frontier logo]()
$235
This Frontier deal was found by Cheapflights users on 6/29. 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.
Wed 7/158:08 pm
FSD
- STL
1 stop23h 15m
Frontier
Sun 7/198:08 pm
STL
- FSD
1 stop23h 15m
Frontier
Deal found 6/29![Frontier logo]()
$242
This American Airlines deal was found by Cheapflights users on 6/28. 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.
Fri 9/117:00 am
FSD
- ORD
Nonstop2h 10m
American Airlines
Sun 9/1310:39 pm
ORD
- FSD
Nonstop1h 50m
American Airlines
Deal found 6/28![American Airlines logo]()
$249
This CheapOair deal was found by Cheapflights users on 6/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:31 pm
FSD
- ORD
1 stop26h 04m
Frontier
Sun 9/1310:40 pm
ORD
- FSD
1 stop19h 56m
Frontier
Deal found 6/30![Frontier logo]()
$250
This American Airlines deal was found by Cheapflights users on 6/29. 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 8/412:41 pm
RAP
- ORD
Nonstop2h 29m
American Airlines
Wed 8/121:20 pm
ORD
- RAP
Nonstop2h 30m
American Airlines
Deal found 6/29![American Airlines logo]()
$251
This American Airlines deal was found by Cheapflights users on 6/30. 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 7/237:06 am
FSD
- ORD
Nonstop1h 59m
American Airlines
Sun 7/2610:30 pm
ORD
- FSD
Nonstop1h 48m
American Airlines
Deal found 6/30![American Airlines logo]()
$251
This United Airlines deal was found by Cheapflights users on 6/28. 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 7/227:35 am
FSD
- ORD
Nonstop1h 56m
United Airlines
Sat 7/258:40 am
ORD
- FSD
Nonstop2h 01m
United Airlines
Deal found 6/28![United Airlines logo]()
$257
This American Airlines deal was found by Cheapflights users on 7/2. 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 7/305:34 pm
FSD
- ORD
1 stop7h 16m
American Airlines
Sat 8/110:30 pm
ORD
- FSD
Nonstop1h 48m
American Airlines
Deal found 7/2![American Airlines logo]()
$259
This American Airlines deal was found by Cheapflights users on 6/27. 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.
Fri 8/73:21 pm
RAP
- ORD
Nonstop2h 39m
American Airlines
Wed 8/121:20 pm
ORD
- RAP
Nonstop2h 30m
American Airlines
Deal found 6/27![American Airlines logo]()
$260
This United Airlines deal was found by Cheapflights users on 6/28. 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 12/316:20 pm
FSD
- ORD
Nonstop1h 46m
United Airlines
Mon 1/47:45 pm
ORD
- FSD
Nonstop1h 58m
United Airlines
Deal found 6/28![United Airlines logo]()
$260
This American Airlines deal was found by Cheapflights users on 6/28. 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.
Fri 7/175:01 pm
FSD
- ORD
Nonstop2h 13m
American Airlines
Sun 7/1910:30 pm
ORD
- FSD
Nonstop1h 48m
American Airlines
Deal found 6/28![American Airlines logo]()
$264
This American Airlines deal was found by Cheapflights users on 7/1. 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 7/233:25 pm
RAP
- ORD
Nonstop2h 34m
American Airlines
Sun 7/269:40 am
ORD
- RAP
Nonstop2h 34m
American Airlines
Deal found 7/1![American Airlines logo]()
$269
Best flights from South Dakota to IllinoisDiscover carefully curated flight deals from South Dakota to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 2, 2026.
Discover carefully curated flight deals from South Dakota to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 2, 2026.
This United Airlines deal was found by Cheapflights users on 6/28. 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 8/217:47 am
FSD
- ORD
Nonstop1h 52m
United Airlines
Mon 8/249:30 pm
ORD
- FSD
Nonstop1h 52m
United Airlines
Deal found 6/28![United Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 6/27. 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 8/201:26 pm
FSD
- MDW
1 stop4h 35m
Delta
Tue 8/259:59 am
MDW
- FSD
1 stop5h 49m
Delta
Deal found 6/27![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 6/29. 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 10/16:41 pm
FSD
- STL
1 stop5h 46m
American Airlines
Sat 10/33:34 pm
STL
- FSD
1 stop5h 11m
American Airlines
Deal found 6/29![American Airlines logo]()
$280
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Sun 8/167:47 am
FSD
- ORD
Nonstop1h 52m
United Airlines
Sun 8/239:30 pm
ORD
- FSD
Nonstop1h 52m
United Airlines
Deal found 7/1![United Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 6/28. 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 8/810:46 am
RAP
- MDW
1 stop6h 15m
Delta
Sun 8/97:25 pm
MDW
- RAP
1 stop4h 12m
Delta
Deal found 6/28![Delta logo]()
$280
This American Airlines deal was found by Cheapflights users on 6/30. 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 8/135:23 pm
FSD
- STL
1 stop6h 51m
American Airlines
Mon 8/175:42 am
STL
- FSD
1 stop6h 35m
American Airlines
Deal found 6/30![American Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 6/27. 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 9/41:26 pm
FSD
- ORD
1 stop3h 33m
Delta
Mon 9/76:00 am
ORD
- FSD
1 stop6h 38m
Delta
Deal found 6/27![Delta logo]()
$284
This United Airlines deal was found by Cheapflights users on 6/30. 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 7/236:51 pm
FSD
- STL
1 stop5h 06m
United Airlines
Sat 7/255:59 pm
STL
- FSD
1 stop5h 32m
United Airlines
Deal found 6/30![United Airlines logo]()
$289
This American Airlines deal was found by Cheapflights users on 7/1. 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 9/244:56 pm
RAP
- STL
1 stop5h 47m
American Airlines
Sun 9/277:27 am
STL
- RAP
1 stop4h 48m
American Airlines
Deal found 7/1![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/29. 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 12/237:40 am
FSD
- ORD
Nonstop1h 56m
United Airlines
Sun 12/277:45 pm
ORD
- FSD
Nonstop1h 58m
United Airlines
Deal found 6/29![United Airlines logo]()
$290
This Delta deal was found by Cheapflights users on 7/1. 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 8/1510:54 am
FSD
- ORD
1 stop6h 47m
Delta
Mon 8/176:00 am
ORD
- FSD
1 stop6h 38m
Delta
Deal found 7/1![Delta logo]()
$314
This United Airlines deal was found by Cheapflights users on 6/28. 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 10/81:37 pm
RAP
- ORD
Nonstop2h 24m
United Airlines
Sun 10/116:00 am
ORD
- RAP
1 stop7h 26m
United Airlines
Deal found 6/28![United Airlines logo]()
$301
This United Airlines deal was found by Cheapflights users on 6/27. 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 8/215:58 pm
RAP
- STL
1 stop4h 42m
United Airlines
Tue 9/14:40 pm
STL
- RAP
1 stop4h 57m
United Airlines
Deal found 6/27![United Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 6/27. 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 7/183:26 pm
RAP
- ORD
Nonstop2h 34m
American Airlines
Sun 7/191:20 pm
ORD
- RAP
Nonstop2h 35m
American Airlines
Deal found 6/27![American Airlines logo]()
$391
This United Airlines deal was found by Cheapflights users on 6/29. 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.
Mon 7/275:53 pm
RAP
- STL
1 stop5h 04m
United Airlines
Mon 8/35:10 am
STL
- RAP
1 stop5h 09m
United Airlines
Deal found 6/29![United Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/30. 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 7/316:28 pm
FSD
- ORD
Nonstop1h 58m
United Airlines
Sat 8/19:30 pm
ORD
- FSD
Nonstop2h 01m
United Airlines
Deal found 6/30![United Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 6/28. 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 12/155:15 am
FSD
- MDW
2 stops7h 18m
Delta
Thu 12/315:35 pm
MDW
- FSD
1 stop5h 16m
Delta
Deal found 6/28![Delta logo]()
$429
This United Airlines deal was found by Cheapflights users on 6/27. 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 9/41:31 pm
RAP
- ORD
Nonstop2h 24m
United Airlines
Mon 9/75:55 am
ORD
- RAP
1 stop7h 00m
United Airlines
Deal found 6/27![United Airlines logo]()
$323
This Delta deal was found by Cheapflights users on 6/28. 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 7/282:56 pm
ABR
- MDW
1 stop3h 22m
Delta
Sat 8/11:49 pm
MDW
- ABR
1 stop5h 49m
Delta
Deal found 6/28![Delta logo]()
$442
This Delta deal was found by Cheapflights users on 6/28. 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 8/211:26 pm
FSD
- MDW
1 stop4h 35m
Delta
Mon 8/241:25 pm
MDW
- FSD
2 stops6h 04m
Delta
Deal found 6/28![Delta logo]()
$444
This United Airlines deal was found by Cheapflights users on 6/30. 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 12/156:20 pm
FSD
- ORD
Nonstop1h 46m
United Airlines
Fri 12/187:45 pm
ORD
- FSD
Nonstop1h 58m
United Airlines
Deal found 6/30![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 6/29. 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 9/41:26 pm
FSD
- MDW
1 stop4h 35m
Delta
Mon 9/77:25 pm
MDW
- FSD
1 stop3h 26m
Delta
Deal found 6/29![Delta logo]()
$449
This United Airlines deal was found by Cheapflights users on 6/30. 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 8/266:39 pm
FSD
- STL
1 stop4h 20m
United Airlines
Sat 8/299:00 am
STL
- FSD
1 stop7h 23m
United Airlines
Deal found 6/30![United Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 6/28. 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 10/2811:25 am
RAP
- ORD
1 stop8h 05m
United Airlines
Sat 10/3110:50 am
ORD
- RAP
1 stop7h 14m
United Airlines
Deal found 6/28![United Airlines logo]()
$351
This American Airlines deal was found by Cheapflights users on 6/29. 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 7/225:34 pm
FSD
- BMI
2 stops24h 00m
American Airlines
Wed 7/295:00 am
BMI
- FSD
2 stops16h 58m
American Airlines
Deal found 6/29![American Airlines logo]()
$703
This Delta deal was found by Cheapflights users on 7/1. 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 8/131:26 pm
FSD
- STL
2 stops10h 32m
Delta
Mon 8/175:34 pm
STL
- FSD
1 stop5h 17m
Delta
Deal found 7/1![Delta logo]()
$484
This United Airlines deal was found by Cheapflights users on 6/27. 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 12/86:20 pm
FSD
- BMI
1 stop4h 20m
United Airlines
Sat 12/123:10 pm
BMI
- FSD
1 stop6h 33m
United Airlines
Deal found 6/27![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 7/2. 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 8/185:00 am
FSD
- MDW
1 stop3h 39m
Delta
Thu 8/209:59 am
MDW
- FSD
1 stop5h 49m
Delta
Deal found 7/2![Delta logo]()
$507
This American Airlines deal was found by Cheapflights users on 6/29. 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 7/295:34 pm
FSD
- BMI
2 stops24h 00m
American Airlines
Wed 8/51:46 pm
BMI
- FSD
2 stops22h 31m
American Airlines
Deal found 6/29![American Airlines logo]()
$761
This United Airlines deal was found by Cheapflights users on 6/30. 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.
Mon 7/203:31 pm
RAP
- ORD
1 stop8h 13m
United Airlines
Wed 7/299:30 pm
ORD
- RAP
Nonstop2h 46m
United Airlines
Deal found 6/30![United Airlines logo]()
$379
Last-minute flights from South Dakota to IllinoisDiscover last-minute flight deals from South Dakota to Illinois. Data last updated July 2, 2026 and is based on user searches.
Discover last-minute flight deals from South Dakota to Illinois. Data last updated July 2, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/29. 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.
Wed 7/158:08 pm
FSD
- STL
1 stop23h 15m
Frontier
Sun 7/198:08 pm
STL
- FSD
1 stop23h 15m
Frontier
Deal found 6/29![Frontier logo]()
$242
This American Airlines deal was found by Cheapflights users on 6/27. 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.
Fri 7/175:01 pm
FSD
- ORD
Nonstop2h 13m
American Airlines
Sun 7/1910:30 pm
ORD
- FSD
Nonstop1h 48m
American Airlines
Deal found 6/27![American Airlines logo]()
$264
This United Airlines deal was found by Cheapflights users on 6/28. 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 7/227:35 am
FSD
- ORD
Nonstop1h 56m
United Airlines
Sat 7/258:40 am
ORD
- FSD
Nonstop2h 01m
United Airlines
Deal found 6/28![United Airlines logo]()
$257
This American Airlines deal was found by Cheapflights users on 7/1. 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 7/234:43 pm
FSD
- ORD
Nonstop2h 05m
American Airlines
Sun 7/2610:30 pm
ORD
- FSD
Nonstop1h 48m
American Airlines
Deal found 7/1![American Airlines logo]()
$250
This American Airlines deal was found by Cheapflights users on 7/1. 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 7/233:25 pm
RAP
- ORD
Nonstop2h 34m
American Airlines
Sun 7/269:40 am
ORD
- RAP
Nonstop2h 34m
American Airlines
Deal found 7/1![American Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 6/30. 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.
Fri 7/244:43 pm
FSD
- ORD
Nonstop2h 05m
American Airlines
Sun 7/2610:30 pm
ORD
- FSD
Nonstop1h 48m
American Airlines
Deal found 6/30![American Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 6/28. 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 7/2510:53 am
FSD
- ORD
1 stop6h 33m
Delta
Sun 8/26:30 am
ORD
- FSD
1 stop6h 19m
Delta
Deal found 6/28![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 7/2. 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 7/305:34 pm
FSD
- ORD
1 stop7h 16m
American Airlines
Sat 8/110:30 pm
ORD
- FSD
Nonstop1h 48m
American Airlines
Deal found 7/2![American Airlines logo]()
$259
This CheapOair deal was found by Cheapflights users on 6/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:08 pm
FSD
- ORD
1 stop24h 44m
Frontier
Tue 8/49:57 pm
ORD
- FSD
1 stop21h 26m
Frontier
Deal found 6/27![Frontier logo]()
$235
This American Airlines deal was found by Cheapflights users on 6/29. 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 8/412:41 pm
RAP
- ORD
Nonstop2h 29m
American Airlines
Wed 8/121:20 pm
ORD
- RAP
Nonstop2h 30m
American Airlines
Deal found 6/29![American Airlines logo]()
$251
This American Airlines deal was found by Cheapflights users on 6/27. 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.
Fri 8/73:21 pm
RAP
- ORD
Nonstop2h 39m
American Airlines
Wed 8/121:20 pm
ORD
- RAP
Nonstop2h 30m
American Airlines
Deal found 6/27![American Airlines logo]()
$260
This Delta deal was found by Cheapflights users on 7/1. 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 8/71:26 pm
FSD
- MDW
1 stop4h 35m
Delta
Sat 8/87:25 pm
MDW
- FSD
1 stop3h 26m
Delta
Deal found 7/1![Delta logo]()
$269
One-way flights from South Dakota to IllinoisSearch for one-way flight options from South Dakota to Illinois. Find affordable one-way fares based on user searches. Data last updated July 2, 2026.
Search for one-way flight options from South Dakota to Illinois. Find affordable one-way fares based on user searches. Data last updated July 2, 2026.
This CheapOair deal was found by Cheapflights users on 6/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/208:08 pm
FSD
- ORD
1 stop24h 44m
Frontier
Deal found 6/28![Frontier logo]()
$131
This Trip.com deal was found by Cheapflights users on 6/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/276:33 pm
RAP
- ORD
1 stop15h 51m
Sun Country Air
Deal found 6/29![Sun Country Air logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 6/29. 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.
Sun 9/2710:02 pm
FSD
- ORD
1 stop31h 40m
Multiple Airlines
Deal found 6/29![Multiple Airlines logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 6/28. 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.
Fri 7/243:21 pm
RAP
- ORD
1 stop24h 43m
Sun Country Air
Deal found 6/28![Sun Country Air logo]()
$162
This United Airlines deal was found by Cheapflights users on 6/29. 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 7/226:28 pm
FSD
- ORD
Nonstop1h 58m
United Airlines
Deal found 6/29![United Airlines logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 6/27. 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.
Thu 8/610:06 pm
RAP
- ORD
1 stop30h 31m
Multiple Airlines
Deal found 6/27![Multiple Airlines logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/30. 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.
Sun 8/303:30 pm
RAP
- ORD
1 stop26h 32m
Multiple Airlines
Deal found 6/30![Multiple Airlines logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 6/28. 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.
Mon 8/2410:28 am
FSD
- ORD
2 stops36h 40m
Multiple Airlines
Deal found 6/28![Multiple Airlines logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 6/30. 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.
Mon 10/268:39 pm
FSD
- STL
2 stops16h 42m
Multiple Airlines
Deal found 6/30![Multiple Airlines logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 6/28. 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.
Sun 8/2310:00 pm
FSD
- ORD
1 stop21h 02m
Multiple Airlines
Deal found 6/28![Multiple Airlines logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 6/30. 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.
Sun 8/3010:00 pm
FSD
- ORD
1 stop21h 02m
Multiple Airlines
Deal found 6/30![Multiple Airlines logo]()
$176
This American Airlines deal was found by Cheapflights users on 6/29. 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 7/225:34 pm
FSD
- ORD
1 stop7h 16m
American Airlines
Deal found 6/29![American Airlines logo]()
$179
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 July 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $235 (CheapOair) |
One-way from | $131 (CheapOair) |
Popular in | July |
Cheapest in | January |
Average price | $399 |
Good round-trip deal | $375 or less |
Good one-way deal | $290 or less |
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 July 2, 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
Cheapest round-trip
Quickest round-trip
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Fri 8/21
7:47 am-9:39 am
Nonstop1h 52m
Chicago O'Hare Intl
Mon 8/24
9:30 pm-11:22 pm
Nonstop1h 52m
$249
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Sun 8/16
7:47 am-9:39 am
Nonstop1h 52m
Chicago O'Hare Intl
Sun 8/23
9:30 pm-11:22 pm
Nonstop1h 52m
$249
Sioux FallsChicago
FSD - MDW
FSDMDW
Sioux Falls Joe Foss Field
Thu 8/20
1:26 pm-6:01 pm
1 stop4h 35m
Chicago Midway
Tue 8/25
9:59 am-3:48 pm
1 stop5h 49m
$269
Sioux FallsSt. Louis
FSD - STL
FSDSTL
Sioux Falls Joe Foss Field
Thu 10/1
6:41 pm-12:27 am
1 stop5h 46m
Lambert-St Louis
Sat 10/3
3:34 pm-8:45 pm
1 stop5h 11m
$280
Rapid CityChicago
RAP - MDW
RAPMDW
Rapid City
Sat 8/8
10:46 am-6:01 pm
1 stop6h 15m
Chicago Midway
Sun 8/9
7:25 pm-10:37 pm
1 stop4h 12m
$280
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Fri 9/4
1:26 pm-4:59 pm
1 stop3h 33m
Chicago O'Hare Intl
Mon 9/7
6:00 am-12:38 pm
1 stop6h 38m
$284
Sioux FallsSt. Louis
FSD - STL
FSDSTL
Sioux Falls Joe Foss Field
Thu 8/13
5:23 pm-12:14 am
1 stop6h 51m
Lambert-St Louis
Mon 8/17
5:42 am-12:17 pm
1 stop6h 35m
$289
Sioux FallsSt. Louis
FSD - STL
FSDSTL
Sioux Falls Joe Foss Field
Thu 7/23
6:51 pm-11:57 pm
1 stop5h 06m
Lambert-St Louis
Sat 7/25
5:59 pm-11:31 pm
1 stop5h 32m
$289
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Wed 12/23
7:40 am-9:36 am
Nonstop1h 56m
Chicago O'Hare Intl
Sun 12/27
7:45 pm-9:43 pm
Nonstop1h 58m
$290
Rapid CityChicago
RAP - ORD
RAPORD
Rapid City
Thu 10/8
1:37 pm-5:01 pm
Nonstop2h 24m
Chicago O'Hare Intl
Sun 10/11
6:00 am-12:26 pm
1 stop7h 26m
$301
Showing 1-10 of 60 resultsSorted by cheapest first
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.
FSD-ORD
FSD-STL
RAP-ORD
FSD-MDW
RAP-MDW
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
USSD-USIL
FSD-ORD
FSD-STL
RAP-ORD
FSD-MDW
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 June is currently the most expensive (average of $219). 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 July 2, 2026.
It’s typically best to fly out from South Dakota to Illinois at noon. Doing so could potentially save you 25% on the flight price compared to flying in the afternoon, which is usually more expensive.
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 July 2, 2026.
The most flights from USSD to USIL are scheduled on a Wednesday (19 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (6 on average).
How much does it cost to fly round-trip 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 50 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
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 16, 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. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 July 2, 2026.
Read through reviews of airlines operating flights from South Dakota to Illinois, such as Delta,United Airlines, andAmerican 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.
Overall
7.8
Comfort
7.8
Crew
8.5
Entertainment
7.8
Boarding
8.1
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Overall
7.8
Comfort
7.8
Crew
8.5
Entertainment
7.8
Boarding
8.1
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Overall
7.8
Comfort
7.8
Crew
8.5
Entertainment
7.8
Boarding
8.1
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Overall
7.8
Comfort
7.8
Crew
8.5
Entertainment
7.8
Boarding
8.1
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
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.
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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.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from South Dakota to Illinois by cabin class
Find flights from South Dakota to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
South Dakota and Illinois flights
Browse other South Dakota and Illinois flight options. Last updated on July 2, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Illinois
Find the right flight back to South Dakota after your stay in Illinois
South Dakota to Illinois flights
Consider these flights traveling from South Dakota to Illinois.
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 July 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$187 | Average$278 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$189 | Average$318 | FlexibilityNo cancel fee | On-time69% |