$101+ 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 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
FSD — ORD
Sep 16 — Sep 231
Round-trip
1 adult, Economy
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Find cheap flights from South Dakota to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 August 17, 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 August 17, 2026.
This CheapOair deal was found by Cheapflights users on 8/12. 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 9/118:52 pm -
1 stop27h 31m
Mon 9/146:30 am -
1 stop13h 37m
Deal found 8/12![Frontier logo]()
$190
This CheapOair deal was found by Cheapflights users on 8/13. 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 9/188:52 pm -
1 stop27h 31m
Mon 9/216:30 am -
1 stop13h 37m
Deal found 8/13![Frontier logo]()
$224
This CheapOair deal was found by Cheapflights users on 8/15. 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 11/68:48 pm -
1 stop13h 13m
Sun 11/810:40 pm -
1 stop21h 13m
Deal found 8/15![Frontier logo]()
$250
This American Airlines deal was found by Cheapflights users on 8/13. 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 10/97:39 pm -
Nonstop2h 01m
Sun 10/1110:48 pm -
Nonstop1h 53m
Deal found 8/13![American Airlines logo]()
$259
This American Airlines deal was found by Cheapflights users on 8/17. 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 9/106:41 pm -
Nonstop2h 18m
Sun 9/1310:39 pm -
Nonstop1h 50m
Deal found 8/17![American Airlines logo]()
$260
This American Airlines deal was found by Cheapflights users on 8/13. 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 9/176:41 pm -
Nonstop2h 18m
Sun 9/206:00 am -
1 stop6h 16m
Deal found 8/13![American Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 8/12. 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 9/266:07 pm -
Nonstop2h 38m
Sun 9/279:40 am -
Nonstop2h 35m
Deal found 8/12![American Airlines logo]()
$271
This American Airlines deal was found by Cheapflights users on 8/16. 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 10/36:07 pm -
Nonstop2h 38m
Sun 10/44:00 pm -
Nonstop2h 37m
Deal found 8/16![American Airlines logo]()
$272
This American Airlines deal was found by Cheapflights users on 8/14. 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 9/35:23 pm -
Nonstop2h 11m
Mon 9/710:40 pm -
Nonstop1h 50m
Deal found 8/14![American Airlines logo]()
$274
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 9/258:52 pm -
1 stop27h 31m
Mon 9/286:00 am -
2 stops14h 07m
Deal found 8/13![Frontier logo]()
$277
This American Airlines deal was found by Cheapflights users on 8/15. 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 9/246:07 pm -
Nonstop2h 38m
Mon 9/289:40 am -
Nonstop2h 35m
Deal found 8/15![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 8/12. 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 9/265:05 am -
1 stop3h 43m
Tue 9/297:13 pm -
1 stop3h 38m
Deal found 8/12![Delta logo]()
$279
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 August 17, 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 August 17, 2026.
This United Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 10/175:53 pm -
1 stop5h 06m
Sat 10/248:47 am -
Nonstop2h 28m
Deal found 8/16![United Airlines logo]()
$271
This American Airlines deal was found by Cheapflights users on 8/14. 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 9/1912:56 pm -
1 stop6h 11m
Mon 9/215:18 pm -
1 stop7h 11m
Deal found 8/14![American Airlines logo]()
$290
This Delta deal was found by Cheapflights users on 8/12. 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 11/76:39 am -
1 stop4h 08m
Thu 11/1210:22 am -
1 stop4h 21m
Deal found 8/12![Delta logo]()
$290
This United Airlines deal was found by Cheapflights users on 8/15. 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 9/66:00 am -
1 stop6h 40m
Sun 9/135:30 pm -
1 stop5h 42m
Deal found 8/15![United Airlines logo]()
$290
This Delta deal was found by Cheapflights users on 8/16. 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 10/306:39 am -
1 stop6h 57m
Mon 11/25:30 pm -
1 stop6h 00m
Deal found 8/16![Delta logo]()
$299
This American Airlines deal was found by Cheapflights users on 8/16. 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 9/46:06 pm -
1 stop5h 36m
Wed 9/97:00 am -
1 stop5h 16m
Deal found 8/16![American Airlines logo]()
$314
This United Airlines deal was found by Cheapflights users on 8/13. 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 10/17:50 am -
1 stop4h 23m
Sun 10/45:10 am -
1 stop5h 40m
Deal found 8/13![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 8/12. 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 -
1 stop5h 47m
Sun 9/277:27 am -
1 stop4h 48m
Deal found 8/12![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/16. 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 9/155:48 pm -
1 stop5h 11m
Mon 9/215:00 am -
1 stop5h 27m
Deal found 8/16![United Airlines logo]()
$308
This United Airlines deal was found by Cheapflights users on 8/12. 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 10/157:50 am -
1 stop4h 23m
Sun 10/185:36 pm -
1 stop5h 35m
Deal found 8/12![United Airlines logo]()
$322
This American Airlines deal was found by Cheapflights users on 8/15. 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 9/296:07 pm -
1 stop5h 20m
Tue 10/65:40 am -
1 stop5h 14m
Deal found 8/15![American Airlines logo]()
$387
This Delta deal was found by Cheapflights users on 8/14. 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 11/1211:29 am -
1 stop4h 10m
Sun 11/1510:22 am -
1 stop6h 33m
Deal found 8/14![Delta logo]()
$429
This United Airlines deal was found by Cheapflights users on 8/13. 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 8/286:50 pm -
1 stop4h 50m
Tue 9/15:30 pm -
1 stop5h 52m
Deal found 8/13![United Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 11/77:40 am -
Nonstop1h 57m
Wed 11/118:40 am -
Nonstop1h 52m
Deal found 8/16![United Airlines logo]()
$329
This American Airlines deal was found by Cheapflights users on 8/14. 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 9/46:06 pm -
1 stop5h 36m
Mon 9/78:07 pm -
1 stop4h 23m
Deal found 8/14![American Airlines logo]()
$404
This Delta deal was found by Cheapflights users on 8/16. 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 9/510:54 am -
1 stop5h 03m
Tue 9/87:13 pm -
1 stop3h 38m
Deal found 8/16![Delta logo]()
$454
This Delta deal was found by Cheapflights users on 8/14. 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.
Sun 10/258:30 am -
1 stop3h 17m
Sat 10/311:27 pm -
2 stops6h 05m
Deal found 8/14![Delta logo]()
$467
This United Airlines deal was found by Cheapflights users on 8/12. 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 10/135:53 pm -
1 stop5h 06m
Sat 10/178:47 am -
Nonstop2h 28m
Deal found 8/12![United Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 8/15. 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 10/1411:00 am -
1 stop5h 40m
Sat 10/177:00 am -
2 stops9h 00m
Deal found 8/15![Delta logo]()
$467
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Sat 9/126:00 am -
1 stop6h 40m
Sat 9/195:30 pm -
1 stop5h 42m
Deal found 8/13![United Airlines logo]()
$351
This United Airlines deal was found by Cheapflights users on 8/13. 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 8/2811:22 am -
1 stop4h 12m
Tue 9/112:59 pm -
2 stops8h 38m
Deal found 8/13![United Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 8/16. 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 9/161:05 pm -
1 stop5h 14m
Wed 9/239:59 am -
1 stop5h 47m
Deal found 8/16![Delta logo]()
$513
This United Airlines deal was found by Cheapflights users on 8/15. 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 10/211:37 pm -
Nonstop2h 24m
Sun 10/257:00 am -
1 stop5h 58m
Deal found 8/15![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 8/16. 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 10/278:30 am -
1 stop3h 17m
Wed 10/285:31 pm -
1 stop5h 51m
Deal found 8/16![Delta logo]()
$517
This American Airlines deal was found by Cheapflights users on 8/13. 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 9/412:57 pm -
2 stops11h 02m
Mon 9/76:32 am -
1 stop5h 45m
Deal found 8/13![American Airlines logo]()
$626
This United Airlines deal was found by Cheapflights users on 8/16. 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 12/95:48 pm -
1 stop5h 09m
Sat 12/126:15 pm -
1 stop4h 53m
Deal found 8/16![United Airlines logo]()
$361
This Delta deal was found by Cheapflights users on 8/12. 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.
Sun 11/86:39 am -
1 stop4h 08m
Fri 11/135:25 pm -
1 stop6h 12m
Deal found 8/12![Delta logo]()
$537
This United Airlines deal was found by Cheapflights users on 8/13. 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 9/111:36 pm -
Nonstop2h 24m
Fri 9/188:59 am -
Nonstop2h 26m
Deal found 8/13![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 8/16. 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 9/181:05 pm -
2 stops7h 25m
Sun 9/206:10 am -
1 stop4h 09m
Deal found 8/16![Delta logo]()
$563
This United Airlines deal was found by Cheapflights users on 8/13. 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 11/51:30 pm -
Nonstop2h 33m
Sun 11/88:40 am -
Nonstop2h 51m
Deal found 8/13![United Airlines logo]()
$399
Last-minute flights from South Dakota to IllinoisDiscover last-minute flight deals from South Dakota to Illinois. Data last updated August 17, 2026 and is based on user searches.
Discover last-minute flight deals from South Dakota to Illinois. Data last updated August 17, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/13. 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 8/275:23 pm -
Nonstop2h 11m
Sun 8/309:40 am -
Nonstop1h 56m
Deal found 8/13![American Airlines logo]()
$289
This American Airlines deal was found by Cheapflights users on 8/12. 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 8/276:24 am -
Nonstop2h 06m
Mon 8/319:40 am -
1 stop7h 56m
Deal found 8/12![American Airlines logo]()
$299
This United Airlines deal was found by Cheapflights users on 8/16. 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 8/277:47 am -
Nonstop1h 52m
Sun 8/304:00 pm -
Nonstop1h 58m
Deal found 8/16![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 8/16. 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 9/46:06 pm -
1 stop5h 36m
Wed 9/97:00 am -
1 stop5h 16m
Deal found 8/16![American Airlines logo]()
$314
This American Airlines deal was found by Cheapflights users on 8/13. 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 9/116:07 pm -
Nonstop2h 38m
Fri 9/183:00 pm -
1 stop7h 23m
Deal found 8/13![American Airlines logo]()
$289
This United Airlines deal was found by Cheapflights users on 8/16. 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 9/155:48 pm -
1 stop5h 11m
Mon 9/215:00 am -
1 stop5h 27m
Deal found 8/16![United Airlines logo]()
$308
This American Airlines deal was found by Cheapflights users on 8/12. 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 9/176:07 pm -
Nonstop2h 38m
Tue 9/293:50 pm -
1 stop6h 33m
Deal found 8/12![American Airlines logo]()
$280
This American Airlines deal was found by Cheapflights users on 8/13. 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 9/1912:56 pm -
1 stop6h 11m
Mon 9/215:18 pm -
1 stop7h 11m
Deal found 8/13![American Airlines logo]()
$290
This American Airlines deal was found by Cheapflights users on 8/15. 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 9/246:07 pm -
Nonstop2h 38m
Mon 9/289:40 am -
Nonstop2h 35m
Deal found 8/15![American Airlines logo]()
$279
This American Airlines deal was found by Cheapflights users on 8/13. 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 -
1 stop5h 47m
Sun 9/277:27 am -
1 stop4h 48m
Deal found 8/13![American Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 8/12. 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 9/266:07 pm -
Nonstop2h 38m
Sun 9/279:40 am -
Nonstop2h 35m
Deal found 8/12![American Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 8/12. 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 9/265:05 am -
1 stop3h 43m
Tue 9/297:13 pm -
1 stop3h 38m
Deal found 8/12![Delta logo]()
$279
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 August 17, 2026.
Search for one-way flight options from South Dakota to Illinois. Find affordable one-way fares based on user searches. Data last updated August 17, 2026.
This CheapOair deal was found by Cheapflights users on 8/15. 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 9/148:52 pm -
1 stop27h 31m
Deal found 8/15![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 11/98:48 pm -
1 stop13h 13m
Deal found 8/13![Frontier logo]()
$112
This Jetabroad deal was found by Cheapflights users on 8/13. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:56 pm -
1 stop16h 40m
Deal found 8/13![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 10/167:31 pm -
1 stop28h 53m
Deal found 8/14![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 9/258:52 pm -
1 stop27h 31m
Deal found 8/14![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/118:52 pm -
1 stop27h 31m
Deal found 8/12![Frontier logo]()
$123
This Kiwi.com deal was found by Cheapflights users on 8/15. 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 11/168:48 pm -
1 stop13h 13m
Deal found 8/15![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 9/1012:36 pm -
1 stop16h 02m
Deal found 8/14![Multiple Airlines logo]()
$127
This American Airlines deal was found by Cheapflights users on 8/16. 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 9/166:07 pm -
Nonstop2h 38m
Deal found 8/16![American Airlines logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/149:55 am -
2 stops37h 04m
Deal found 8/12![Multiple Airlines logo]()
$133
This CheapOair deal was found by Cheapflights users on 8/15. 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 9/78:56 pm -
1 stop16h 40m
Deal found 8/15![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 11/1512:06 pm -
1 stop22h 51m
Deal found 8/13![Multiple Airlines logo]()
$137
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 August 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $190 (CheapOair) |
One-way from | $101 (CheapOair) |
Popular in | November |
Cheapest in | January |
Average price | $249 |
Good round-trip deal | $343 or less |
Good one-way deal | $308 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 August 17, 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
Rapid CityChicago
RAP Rapid City - ORD Chicago O'Hare Intl
RAPORD
Rapid City
Sat 10/17
5:53 pm-11:59 pm
1 stop5h 06m
Chicago O'Hare Intl
Sat 10/24
8:47 am-10:15 am
Nonstop2h 28m
$271
Sioux FallsSt. Louis
FSD Sioux Falls Joe Foss Field - STL Lambert-St Louis
FSDSTL
Sioux Falls Joe Foss Field
Sat 9/19
12:56 pm-7:07 pm
1 stop6h 11m
Lambert-St Louis
Mon 9/21
5:18 pm-12:29 am
1 stop7h 11m
$290
Rapid CityChicago
RAP Rapid City - MDW Chicago Midway
RAPMDW
Rapid City
Sat 11/7
6:39 am-11:47 am
1 stop4h 08m
Chicago Midway
Thu 11/12
10:22 am-1:43 pm
1 stop4h 21m
$290
Sioux FallsSt. Louis
FSD Sioux Falls Joe Foss Field - STL Lambert-St Louis
FSDSTL
Sioux Falls Joe Foss Field
Sun 9/6
6:00 am-12:40 pm
1 stop6h 40m
Lambert-St Louis
Sun 9/13
5:30 pm-11:12 pm
1 stop5h 42m
$290
Rapid CityChicago
RAP Rapid City - ORD Chicago O'Hare Intl
RAPORD
Rapid City
Fri 10/30
6:39 am-2:36 pm
1 stop6h 57m
Chicago O'Hare Intl
Mon 11/2
5:30 pm-10:30 pm
1 stop6h 00m
$299
Sioux FallsSt. Louis
FSD Sioux Falls Joe Foss Field - STL Lambert-St Louis
FSDSTL
Sioux Falls Joe Foss Field
Thu 10/1
7:50 am-12:13 pm
1 stop4h 23m
Lambert-St Louis
Sun 10/4
5:10 am-10:50 am
1 stop5h 40m
$299
Rapid CityChicago
RAP Rapid City - ORD Chicago O'Hare Intl
RAPORD
Rapid City
Tue 9/15
5:48 pm-11:59 pm
1 stop5h 11m
Chicago O'Hare Intl
Mon 9/21
5:00 am-9:27 am
1 stop5h 27m
$308
Sioux FallsSt. Louis
FSD Sioux Falls Joe Foss Field - STL Lambert-St Louis
FSDSTL
Sioux Falls Joe Foss Field
Fri 9/4
6:06 pm-11:42 pm
1 stop5h 36m
Lambert-St Louis
Wed 9/9
7:00 am-12:16 pm
1 stop5h 16m
$314
Rapid CitySt. Louis
RAP Rapid City - STL Lambert-St Louis
RAPSTL
Rapid City
Thu 9/24
4:56 pm-11:43 pm
1 stop5h 47m
Lambert-St Louis
Sun 9/27
7:27 am-11:15 am
1 stop4h 48m
$319
Sioux FallsSt. Louis
FSD Sioux Falls Joe Foss Field - STL Lambert-St Louis
FSDSTL
Sioux Falls Joe Foss Field
Thu 10/15
7:50 am-12:13 pm
1 stop4h 23m
Lambert-St Louis
Sun 10/18
5:36 pm-11:11 pm
1 stop5h 35m
$322
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.
RAP-ORD
FSD-STL
RAP-MDW
RAP-STL
FSD-ORD
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
RAP-ORD
FSD-STL
RAP-MDW
RAP-STL
What is the cheapest month to book a flight from South Dakota to Illinois?
Currently, November is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $246). Flying from South Dakota to Illinois in June is currently the most expensive (average of $347). 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 August 17, 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 August 17, 2026.
The most flights from USSD to USIL are scheduled on a Monday (18 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (10 on average).
How much does it cost to fly round-trip from South Dakota to Illinois?
Airfare is below average for this route at the moment.
South Dakota to Illinois flights typically cost between $249 and $329 in September.The cheapest round-trip price found within the last 5 days was $190 on Frontier (Sep 11-Sep 14).
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 45 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. Monday 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 August 17, 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
Food
7.2
Entertainment
7.8
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Overall
7.8
Comfort
7.8
Crew
8.5
Food
7.2
Entertainment
7.8
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Overall
7.8
Comfort
7.8
Crew
8.5
Food
7.2
Entertainment
7.8
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Overall
7.8
Comfort
7.8
Crew
8.5
Food
7.2
Entertainment
7.8
Boarding
8.1
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
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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 August 17, 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 August 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$187 | Average$282 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$189 | Average$310 | FlexibilityNo cancel fee | On-time69% |