$86+ Cheap flights from Austin (AUS) 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ORD
Aug 24 — Aug 311
Round-trip
1 adult, Economy
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Cheapest flights from Austin to IllinoisExplore the most affordable flight options available from Austin to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 25, 2026.
Explore the most affordable flight options available from Austin to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Wed 9/1610:50 am
AUS
- STL
1 stop22h 50m
Frontier
Tue 9/2210:35 am
STL
- AUS
1 stop23h 13m
Frontier
Deal found 7/23![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 10/610:50 am
AUS
- STL
1 stop22h 50m
Frontier
Tue 10/1310:35 am
STL
- AUS
1 stop23h 13m
Frontier
Deal found 7/23![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 10/910:50 am
AUS
- STL
1 stop22h 50m
Frontier
Mon 10/1210:35 am
STL
- AUS
1 stop23h 13m
Frontier
Deal found 7/22![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 7/24. 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 8/275:37 pm
AUS
- STL
1 stop23h 45m
Frontier
Sun 8/306:17 pm
STL
- AUS
1 stop22h 22m
Frontier
Deal found 7/24![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 10/2210:50 am
AUS
- STL
1 stop22h 50m
Frontier
Mon 10/268:10 pm
STL
- AUS
1 stop27h 49m
Frontier
Deal found 7/23![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:50 am
AUS
- STL
1 stop22h 50m
Frontier
Sun 9/2710:35 am
STL
- AUS
1 stop23h 13m
Frontier
Deal found 7/20![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/122:51 pm
AUS
- STL
1 stop26h 46m
Frontier
Mon 8/174:57 pm
STL
- AUS
1 stop23h 42m
Frontier
Deal found 7/20![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/141:33 pm
AUS
- STL
1 stop19h 24m
Frontier
Thu 8/206:17 pm
STL
- AUS
1 stop22h 22m
Frontier
Deal found 7/20![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:50 am
AUS
- STL
1 stop22h 50m
Frontier
Sun 9/1310:35 am
STL
- AUS
1 stop23h 13m
Frontier
Deal found 7/21![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/206:15 am
AUS
- STL
1 stop12h 58m
Frontier
Sun 8/236:17 pm
STL
- AUS
1 stop22h 22m
Frontier
Deal found 7/22![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:45 am
AUS
- PIA
1 stop6h 34m
Multiple Airlines
Sun 11/15:24 pm
PIA
- AUS
1 stop26h 02m
Multiple Airlines
Deal found 7/21![Multiple Airlines logo]()
$241
This Priceline deal was found by Cheapflights users on 7/20. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/82:51 pm
AUS
- MDW
1 stop7h 12m
Frontier
Tue 8/1111:06 am
MDW
- AUS
1 stop5h 33m
Frontier
Deal found 7/20![Frontier logo]()
$248
Best flights from Austin to IllinoisDiscover carefully curated flight deals from Austin to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 25, 2026.
Discover carefully curated flight deals from Austin to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 25, 2026.
This Southwest deal was found by Cheapflights users on 7/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/113:50 pm
AUS
- STL
Nonstop2h 05m
Southwest
Sat 8/158:25 am
STL
- AUS
Nonstop2h 00m
Southwest
Deal found 7/22![Southwest logo]()
$209
This United Airlines deal was found by Cheapflights users on 7/21. 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 8/189:00 am
AUS
- ORD
Nonstop2h 55m
United Airlines
Tue 8/2511:00 am
ORD
- AUS
Nonstop2h 58m
United Airlines
Deal found 7/21![United Airlines logo]()
$261
This American Airlines deal was found by Cheapflights users on 7/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:41 pm
AUS
- PIA
1 stop5h 38m
American Airlines
Tue 8/257:11 am
PIA
- AUS
1 stop4h 41m
American Airlines
Deal found 7/20![American Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 7/23. 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 8/135:20 am
AUS
- ORD
1 stop7h 48m
Delta
Sat 8/153:00 pm
ORD
- AUS
1 stop5h 55m
Delta
Deal found 7/23![Delta logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/2712:47 pm
AUS
- RFD
1 stop7h 58m
Multiple Airlines
Sun 8/303:59 pm
RFD
- AUS
2 stops31h 42m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$350
This Southwest deal was found by Cheapflights users on 7/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:55 pm
AUS
- STL
1 stop3h 30m
Southwest
Thu 8/208:45 pm
STL
- AUS
Nonstop2h 00m
Southwest
Deal found 7/23![Southwest logo]()
$215
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/195:44 pm
AUS
- ORD
1 stop5h 42m
United Airlines
Wed 8/268:10 pm
ORD
- AUS
Nonstop2h 55m
United Airlines
Deal found 7/20![United Airlines logo]()
$271
This Southwest deal was found by Cheapflights users on 7/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/283:15 pm
AUS
- STL
Nonstop2h 05m
Southwest
Mon 8/318:25 am
STL
- AUS
Nonstop2h 00m
Southwest
Deal found 7/21![Southwest logo]()
$249
This Delta deal was found by Cheapflights users on 7/23. 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 8/135:20 am
AUS
- ORD
1 stop7h 48m
Delta
Mon 8/171:41 pm
ORD
- AUS
1 stop8h 17m
Delta
Deal found 7/23![Delta logo]()
$281
This United Airlines deal was found by Cheapflights users on 7/24. 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 8/184:10 pm
AUS
- ORD
1 stop5h 22m
United Airlines
Wed 8/268:10 pm
ORD
- AUS
Nonstop2h 55m
United Airlines
Deal found 7/24![United Airlines logo]()
$271
This American Airlines deal was found by Cheapflights users on 7/22. 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 10/67:41 am
AUS
- SPI
1 stop6h 48m
American Airlines
Tue 10/132:59 pm
SPI
- AUS
1 stop7h 37m
American Airlines
Deal found 7/22![American Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 7/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/145:35 pm
AUS
- STL
1 stop4h 30m
Southwest
Thu 8/208:45 pm
STL
- AUS
Nonstop2h 00m
Southwest
Deal found 7/20![Southwest logo]()
$259
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/191:00 pm
AUS
- PIA
1 stop6h 03m
United Airlines
Tue 8/258:29 am
PIA
- AUS
2 stops6h 57m
United Airlines
Deal found 7/20![United Airlines logo]()
$282
This Southwest deal was found by Cheapflights users on 7/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/124:40 pm
AUS
- MDW
Nonstop2h 30m
Southwest
Mon 8/178:40 pm
MDW
- AUS
Nonstop2h 30m
Southwest
Deal found 7/21![Southwest logo]()
$261
This American Airlines deal was found by Cheapflights users on 7/24. 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 9/56:47 pm
AUS
- BMI
1 stop5h 12m
American Airlines
Sat 9/125:02 am
BMI
- AUS
1 stop6h 08m
American Airlines
Deal found 7/24![American Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2712:47 pm
AUS
- RFD
1 stop7h 58m
Multiple Airlines
Mon 8/317:04 pm
RFD
- AUS
2 stops21h 35m
Multiple Airlines
Deal found 7/20![Multiple Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 7/20. 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.
Fri 8/73:00 pm
AUS
- MLI
1 stop7h 19m
Delta
Wed 8/126:00 am
MLI
- AUS
1 stop6h 29m
Delta
Deal found 7/20![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 7/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:30 pm
AUS
- MDW
Nonstop2h 30m
Southwest
Wed 8/1910:15 am
MDW
- AUS
Nonstop2h 35m
Southwest
Deal found 7/23![Southwest logo]()
$261
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Mon 8/175:20 pm
AUS
- ORD
Nonstop2h 58m
United Airlines
Thu 8/207:00 am
ORD
- AUS
Nonstop2h 58m
United Airlines
Deal found 7/20![United Airlines logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:43 am
AUS
- RFD
2 stops22h 57m
Multiple Airlines
Sun 10/119:33 pm
RFD
- AUS
1 stop14h 03m
Multiple Airlines
Deal found 7/21![Multiple Airlines logo]()
$354
This American Airlines deal was found by Cheapflights users on 7/24. 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 8/216:00 am
AUS
- MLI
1 stop5h 02m
American Airlines
Fri 8/2811:43 am
MLI
- AUS
2 stops7h 28m
American Airlines
Deal found 7/24![American Airlines logo]()
$324
This KAYAK deal was found by Cheapflights users on 7/21. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:00 pm
AUS
- ORD
1 stop8h 30m
Delta
Thu 8/205:30 am
ORD
- AUS
1 stop5h 30m
Delta
Deal found 7/21![Delta logo]()
$336
This Southwest deal was found by Cheapflights users on 7/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/166:00 am
AUS
- STL
1 stop4h 35m
Southwest
Mon 8/178:45 pm
STL
- AUS
Nonstop2h 00m
Southwest
Deal found 7/20![Southwest logo]()
$263
This United Airlines deal was found by Cheapflights users on 7/21. 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.
Thu 10/226:45 am
AUS
- ORD
Nonstop2h 55m
United Airlines
Mon 10/2611:40 am
ORD
- AUS
Nonstop3h 03m
United Airlines
Deal found 7/21![United Airlines logo]()
$291
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/193:41 pm
AUS
- SPI
2 stops8h 31m
American Airlines
Wed 8/266:08 am
SPI
- AUS
1 stop4h 48m
American Airlines
Deal found 7/22![American Airlines logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:31 pm
AUS
- RFD
1 stop8h 08m
Multiple Airlines
Sun 9/133:53 pm
RFD
- AUS
2 stops32h 06m
Multiple Airlines
Deal found 7/21![Multiple Airlines logo]()
$368
This United Airlines deal was found by Cheapflights users on 7/24. 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 9/31:00 pm
AUS
- ORD
Nonstop2h 55m
United Airlines
Mon 9/77:00 am
ORD
- AUS
Nonstop2h 58m
United Airlines
Deal found 7/24![United Airlines logo]()
$292
This Southwest deal was found by Cheapflights users on 7/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:25 pm
AUS
- MDW
1 stop4h 20m
Southwest
Tue 10/138:40 pm
MDW
- AUS
Nonstop2h 35m
Southwest
Deal found 7/22![Southwest logo]()
$267
This Delta deal was found by Cheapflights users on 7/20. 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 8/65:15 am
AUS
- STL
1 stop6h 31m
Delta
Sun 8/96:00 am
STL
- AUS
1 stop5h 00m
Delta
Deal found 7/20![Delta logo]()
$357
This American Airlines deal was found by Cheapflights users on 7/21. 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.
Thu 9/176:38 pm
AUS
- SPI
1 stop5h 29m
American Airlines
Sun 9/206:00 am
SPI
- AUS
1 stop4h 50m
American Airlines
Deal found 7/21![American Airlines logo]()
$329
Last-minute flights from Austin to IllinoisDiscover last-minute flight deals from Austin to Illinois. Data last updated July 25, 2026 and is based on user searches.
Discover last-minute flight deals from Austin to Illinois. Data last updated July 25, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 7/20. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/82:51 pm
AUS
- MDW
1 stop7h 12m
Frontier
Tue 8/1111:06 am
MDW
- AUS
1 stop5h 33m
Frontier
Deal found 7/20![Frontier logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/122:51 pm
AUS
- STL
1 stop26h 46m
Frontier
Mon 8/174:57 pm
STL
- AUS
1 stop23h 42m
Frontier
Deal found 7/20![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/135:34 pm
AUS
- STL
1 stop15h 23m
Frontier
Mon 8/174:57 pm
STL
- AUS
1 stop23h 42m
Frontier
Deal found 7/23![Frontier logo]()
$188
This Southwest deal was found by Cheapflights users on 7/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1311:40 am
AUS
- STL
Nonstop2h 05m
Southwest
Mon 8/175:15 am
STL
- AUS
1 stop5h 45m
Southwest
Deal found 7/23![Southwest logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/141:33 pm
AUS
- STL
1 stop19h 24m
Frontier
Thu 8/206:17 pm
STL
- AUS
1 stop22h 22m
Frontier
Deal found 7/20![Frontier logo]()
$177
This Southwest deal was found by Cheapflights users on 7/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:00 am
AUS
- STL
Nonstop2h 05m
Southwest
Mon 8/178:45 pm
STL
- AUS
Nonstop2h 00m
Southwest
Deal found 7/24![Southwest logo]()
$217
This Southwest deal was found by Cheapflights users on 7/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/183:50 pm
AUS
- STL
Nonstop2h 05m
Southwest
Wed 8/198:50 pm
STL
- AUS
Nonstop2h 00m
Southwest
Deal found 7/22![Southwest logo]()
$209
This Super.com deal was found by Cheapflights users on 7/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:15 pm
AUS
- ORD
1 stop17h 21m
Frontier
Mon 8/242:41 pm
ORD
- AUS
1 stop9h 00m
Frontier
Deal found 7/24![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/206:15 am
AUS
- STL
1 stop12h 58m
Frontier
Sun 8/236:17 pm
STL
- AUS
1 stop22h 22m
Frontier
Deal found 7/22![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/246:15 am
AUS
- STL
1 stop12h 58m
Frontier
Fri 8/286:17 pm
STL
- AUS
2 stops29h 24m
Frontier
Deal found 7/19![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 7/24. 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 8/275:37 pm
AUS
- STL
1 stop23h 45m
Frontier
Sun 8/306:17 pm
STL
- AUS
1 stop22h 22m
Frontier
Deal found 7/24![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:15 pm
AUS
- ORD
1 stop17h 21m
Frontier
Sun 8/307:44 pm
ORD
- AUS
1 stop14h 26m
Frontier
Deal found 7/20![Frontier logo]()
$249
One-way flights from Austin to IllinoisSearch for one-way flight options from Austin to Illinois. Find affordable one-way fares based on user searches. Data last updated July 25, 2026.
Search for one-way flight options from Austin to Illinois. Find affordable one-way fares based on user searches. Data last updated July 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 9/2210:50 am
AUS
- STL
1 stop22h 50m
Frontier
Deal found 7/23![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 9/2110:50 am
AUS
- STL
1 stop22h 50m
Frontier
Deal found 7/23![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/205:37 pm
AUS
- STL
1 stop23h 45m
Frontier
Deal found 7/23![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 7/22. 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.
Wed 8/195:37 pm
AUS
- STL
1 stop23h 45m
Frontier
Deal found 7/22![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:37 pm
AUS
- STL
1 stop23h 45m
Frontier
Deal found 7/22![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:16 pm
AUS
- STL
2 stops13h 24m
Frontier
Deal found 7/20![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:27 pm
AUS
- STL
1 stop21h 48m
Frontier
Deal found 7/21![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:50 am
AUS
- STL
1 stop22h 50m
Frontier
Deal found 7/21![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/246:15 am
AUS
- STL
1 stop12h 58m
Frontier
Deal found 7/22![Frontier logo]()
$103
This Southwest deal was found by Cheapflights users on 7/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/191:30 pm
AUS
- MDW
Nonstop2h 30m
Southwest
Deal found 7/22![Southwest logo]()
$131
This United Airlines deal was found by Cheapflights users on 7/21. 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.
Sat 8/159:00 am
AUS
- ORD
Nonstop2h 55m
United Airlines
Deal found 7/21![United Airlines logo]()
$131
This Frontier deal was found by Cheapflights users on 7/25. 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 10/910:50 am
AUS
- MDW
1 stop11h 08m
Frontier
Deal found 7/25![Frontier logo]()
$132
Find flight deals from Austin to Illinois
Keep the following information in mind while searching for Austin to Illinois flight deals. Data was last updated July 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $169 (Kiwi.com) |
One-way from | $86 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $334 |
Good round-trip deal | $303 or less |
Good one-way deal | $186 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Austin 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 25, 2026.
Use the filters below to find and compare flights from Austin to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
AustinSt. Louis
AUS - STL
AUSSTL
Austin Bergstrom
Tue 8/11
3:50 pm-5:55 pm
Nonstop2h 05m
Lambert-St Louis
Sat 8/15
8:25 am-10:25 am
Nonstop2h 00m
$209
AustinSt. Louis
AUS - STL
AUSSTL
Austin Bergstrom
Tue 8/18
12:55 pm-4:25 pm
1 stop3h 30m
Lambert-St Louis
Thu 8/20
8:45 pm-10:45 pm
Nonstop2h 00m
$215
AustinSt. Louis
AUS - STL
AUSSTL
Austin Bergstrom
Fri 8/28
3:15 pm-5:20 pm
Nonstop2h 05m
Lambert-St Louis
Mon 8/31
8:25 am-10:25 am
Nonstop2h 00m
$249
AustinSt. Louis
AUS - STL
AUSSTL
Austin Bergstrom
Fri 8/14
5:35 pm-10:05 pm
1 stop4h 30m
Lambert-St Louis
Thu 8/20
8:45 pm-10:45 pm
Nonstop2h 00m
$259
AustinChicago
AUS - ORD
AUSORD
Austin Bergstrom
Tue 8/18
9:00 am-11:55 am
Nonstop2h 55m
Chicago O'Hare Intl
Tue 8/25
11:00 am-1:58 pm
Nonstop2h 58m
$261
AustinChicago
AUS - MDW
AUSMDW
Austin Bergstrom
Wed 8/12
4:40 pm-7:10 pm
Nonstop2h 30m
Chicago Midway
Mon 8/17
8:40 pm-11:10 pm
Nonstop2h 30m
$261
AustinChicago
AUS - MDW
AUSMDW
Austin Bergstrom
Tue 8/18
1:30 pm-4:00 pm
Nonstop2h 30m
Chicago Midway
Wed 8/19
10:15 am-12:50 pm
Nonstop2h 35m
$261
AustinSt. Louis
AUS - STL
AUSSTL
Austin Bergstrom
Sun 8/16
6:00 am-10:35 am
1 stop4h 35m
Lambert-St Louis
Mon 8/17
8:45 pm-10:45 pm
Nonstop2h 00m
$263
AustinChicago
AUS - MDW
AUSMDW
Austin Bergstrom
Tue 10/6
2:25 pm-6:45 pm
1 stop4h 20m
Chicago Midway
Tue 10/13
8:40 pm-11:15 pm
Nonstop2h 35m
$267
AustinChicago
AUS - ORD
AUSORD
Austin Bergstrom
Wed 8/19
5:44 pm-11:26 pm
1 stop5h 42m
Chicago O'Hare Intl
Wed 8/26
8:10 pm-11:05 pm
Nonstop2h 55m
$271
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Austin to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Austin with our price prediction graph.
AUS-STL
AUS-ORD
AUS-PIA
AUS-BMI
AUS-MLI
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 Austin to Illinois
AUS-USIL
AUS-STL
AUS-ORD
AUS-PIA
AUS-BMI
What is the cheapest month to book a flight from Austin to Illinois?
Currently, January is the cheapest month in which you can book a flight from Austin to Illinois (average of $218). Flying from Austin to Illinois in June is currently the most expensive (average of $359). 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 AUS to IL?
Find hourly flight availability from Austin 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 25, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 45% on flights from Austin to Illinois by exploring options for tickets in the evening.
Weekly flight availability from Austin to Illinois
Explore weekly flight availability from Austin 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 25, 2026.
The most flights from AUS to USIL are scheduled on a Monday (41 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).
How much does it cost to fly round-trip from Austin to Illinois?
Airfare is below average for this route at the moment.
Austin to Illinois flights typically cost between $260 and $416 in October.The cheapest round-trip price found within the last 5 days was $248 on Frontier (Oct 7-Oct 13).
How far ahead should I book a flight from Austin to Illinois?
To ensure you get the cheapest price possible for a flight from Austin to Illinois, you should look to book at least 79 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest day to fly from Austin to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Austin to Illinois. Price data was last updated on July 18, 2026.
Travelers seeking maximum savings on their Austin to Illinois flight should consider departing on Tuesday evenings when fares are most often at their lowest. Monday at noon 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 25, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican Airlines from Austin to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from Austin 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 Austin 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 Austin to Illinois by cabin class
Find flights from Austin to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Austin and Illinois flights
Browse other Austin and Illinois flight options. Last updated on July 25, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Austin to Illinois flights
Consider these flights traveling from Austin to Illinois.
Top 6 airlines flying from Austin to Illinois
Discover the top 6 airlines that operate flights from Austin 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 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$67 | Average$234 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$162 | Average$547 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$166 | Average$419 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$169 | Average$344 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$173 | Average$246 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$190 | Average$380 | FlexibilityNo cancel fee | On-time69% |