$104+ Cheap flights from San Antonio (SAT) 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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jul 31 — Aug 71
Round-trip
1 adult, Economy
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Cheapest flights from San Antonio to IllinoisExplore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2026.
Explore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2026.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/84:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Mon 8/107:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 6/27![Frontier logo]()
$260
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/254:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Sat 8/18:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/27![Frontier logo]()
$271
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/289:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Tue 8/117:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/28![Frontier logo]()
$276
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/109:51 am
SAT
- STL
1 stop14h 08m
Frontier
Tue 8/117:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/27![Frontier logo]()
$281
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Wed 8/57:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 7/1![Frontier logo]()
$283
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/279:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Mon 8/37:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 6/27![Frontier logo]()
$287
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:08 am
SAT
- STL
1 stop8h 07m
Frontier
Sun 9/208:34 pm
STL
- SAT
1 stop12h 28m
Frontier
Deal found 6/30![Frontier logo]()
$290
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.
Tue 8/2510:24 pm
SAT
- STL
1 stop19h 26m
Frontier
Fri 8/286:45 pm
STL
- SAT
1 stop26h 44m
Frontier
Deal found 6/30![Frontier logo]()
$295
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.
Wed 7/299:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Thu 7/305:13 pm
ORD
- SAT
1 stop15h 43m
Frontier
Deal found 6/29![Frontier logo]()
$298
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.
Mon 7/207:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Thu 7/235:13 pm
ORD
- SAT
1 stop15h 43m
Frontier
Deal found 6/30![Frontier logo]()
$299
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/103:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Sat 8/1510:05 am
MDW
- SAT
2 stops5h 55m
Southwest
Deal found 6/29![Southwest logo]()
$299
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.
Tue 7/287:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Tue 8/46:34 pm
STL
- SAT
2 stops24h 20m
Frontier
Deal found 6/30![Frontier logo]()
$300
Best flights from San Antonio to IllinoisDiscover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 1, 2026.
Discover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 1, 2026.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:08 am
SAT
- STL
1 stop8h 07m
Frontier
Sun 9/208:34 pm
STL
- SAT
1 stop12h 28m
Frontier
Deal found 6/30![Frontier logo]()
$290
This American Airlines deal was found by Cheapflights users on 6/26. 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 8/76:52 pm
SAT
- MLI
1 stop5h 16m
American Airlines
Wed 8/196:00 am
MLI
- SAT
1 stop6h 53m
American Airlines
Deal found 6/26![American Airlines logo]()
$306
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.
Thu 10/298:00 am
SAT
- BMI
1 stop7h 42m
Delta
Mon 11/24:23 pm
BMI
- SAT
1 stop5h 21m
Delta
Deal found 6/29![Delta 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.
Tue 8/259:30 am
SAT
- STL
1 stop4h 45m
United Airlines
Sat 8/297:25 am
STL
- SAT
2 stops8h 18m
United Airlines
Deal found 6/29![United Airlines logo]()
$316
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/102:55 pm
SAT
- STL
1 stop6h 45m
Southwest
Tue 8/118:40 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 6/27![Southwest logo]()
$319
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 7/315:35 pm
SAT
- MLI
1 stop5h 55m
American Airlines
Sat 8/87:22 pm
MLI
- SAT
1 stop5h 18m
American Airlines
Deal found 6/28![American Airlines logo]()
$306
This Delta deal was found by Cheapflights users on 6/26. 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 8/72:43 pm
SAT
- MLI
1 stop7h 36m
Delta
Wed 8/196:00 am
MLI
- SAT
2 stops9h 54m
Delta
Deal found 6/26![Delta logo]()
$311
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:32 pm
SAT
- STL
2 stops20h 05m
Frontier
Wed 8/58:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Deal found 7/1![Frontier logo]()
$315
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.
Sat 8/15:30 am
SAT
- ORD
1 stop4h 50m
United Airlines
Sat 8/17:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 6/27![United Airlines logo]()
$318
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/297:25 am
SAT
- STL
Nonstop2h 10m
Southwest
Wed 8/58:45 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/1![Southwest logo]()
$321
This American Airlines deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/16:57 pm
SAT
- BMI
1 stop5h 38m
American Airlines
Mon 8/104:49 pm
BMI
- SAT
1 stop6h 01m
American Airlines
Deal found 6/26![American Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 6/26. 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 9/175:15 am
SAT
- ORD
1 stop5h 22m
Delta
Mon 9/215:10 pm
ORD
- SAT
1 stop5h 36m
Delta
Deal found 6/26![Delta logo]()
$311
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/17:25 am
SAT
- STL
Nonstop2h 10m
Southwest
Tue 8/48:45 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 6/29![Southwest logo]()
$321
This Delta deal was found by Cheapflights users on 6/26. 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 9/105:15 am
SAT
- ORD
1 stop7h 44m
Delta
Mon 9/148:55 am
ORD
- SAT
1 stop7h 00m
Delta
Deal found 6/26![Delta logo]()
$311
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.
Tue 8/111:00 pm
SAT
- ORD
Nonstop3h 00m
United Airlines
Wed 8/127:50 pm
ORD
- SAT
Nonstop3h 00m
United Airlines
Deal found 6/28![United Airlines logo]()
$355
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/242:15 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Thu 9/248:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/30![Southwest logo]()
$329
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 8/1411:29 am
SAT
- MLI
2 stops10h 50m
Delta
Tue 8/186:00 am
MLI
- SAT
2 stops9h 54m
Delta
Deal found 6/27![Delta logo]()
$316
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.
Tue 7/145:30 am
SAT
- PIA
2 stops7h 08m
United Airlines
Sat 7/185:43 pm
PIA
- SAT
1 stop5h 14m
United Airlines
Deal found 6/29![United Airlines logo]()
$374
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:10 am
SAT
- STL
2 stops6h 15m
Southwest
Sat 8/298:25 am
STL
- SAT
2 stops8h 00m
Southwest
Deal found 6/29![Southwest logo]()
$340
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.
Sat 8/86:25 am
SAT
- STL
1 stop5h 31m
Delta
Sat 8/85:33 pm
STL
- SAT
1 stop5h 10m
Delta
Deal found 6/27![Delta logo]()
$319
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 7/315:32 pm
SAT
- MLI
1 stop5h 44m
United Airlines
Sat 8/81:15 pm
MLI
- SAT
2 stops9h 29m
United Airlines
Deal found 6/28![United Airlines logo]()
$384
This Southwest deal was found by Cheapflights users on 6/26. 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.
Mon 8/175:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Tue 8/181:55 pm
MDW
- SAT
1 stop4h 00m
Southwest
Deal found 6/26![Southwest logo]()
$352
This KAYAK deal was found by Cheapflights users on 6/26. 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.
Sun 8/167:28 am
SAT
- ORD
Nonstop3h 07m
American Airlines
Tue 8/183:54 pm
ORD
- SAT
1 stop6h 56m
American Airlines
Deal found 6/26![American Airlines logo]()
$429
This Delta deal was found by Cheapflights users on 6/26. 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 8/17:40 am
SAT
- BMI
1 stop7h 54m
Delta
Sun 8/94:24 pm
BMI
- SAT
1 stop8h 04m
Delta
Deal found 6/26![Delta logo]()
$339
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:35 am
SAT
- MDW
1 stop5h 40m
Southwest
Mon 11/1610:05 am
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 6/30![Southwest logo]()
$355
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 8/2512:15 pm
SAT
- STL
1 stop6h 56m
United Airlines
Wed 8/261:36 pm
STL
- SAT
1 stop7h 16m
United Airlines
Deal found 6/30![United Airlines logo]()
$391
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 7/102:48 pm
SAT
- BMI
2 stops9h 47m
American Airlines
Mon 7/135:45 pm
BMI
- SAT
1 stop6h 25m
American Airlines
Deal found 6/27![American Airlines logo]()
$437
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 9/411:29 am
SAT
- ORD
1 stop7h 00m
Delta
Tue 9/86:25 pm
ORD
- SAT
1 stop5h 45m
Delta
Deal found 6/28![Delta logo]()
$356
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 7/205:32 pm
SAT
- ORD
Nonstop3h 01m
United Airlines
Wed 7/221:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 6/29![United Airlines logo]()
$394
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/203:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Sun 8/238:40 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/30![Southwest logo]()
$373
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated July 1, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated July 1, 2026 and is based on user searches.
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.
Wed 7/159:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Sun 7/195:13 pm
ORD
- SAT
1 stop15h 43m
Frontier
Deal found 6/30![Frontier logo]()
$300
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 7/159:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Thu 7/237:15 am
ORD
- SAT
1 stop13h 22m
Frontier
Deal found 6/29![Frontier logo]()
$306
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/207:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Thu 7/235:13 pm
ORD
- SAT
1 stop15h 43m
Frontier
Deal found 7/1![Frontier logo]()
$299
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.
Fri 7/249:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Sat 7/259:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/29![Frontier logo]()
$303
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/254:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Sat 8/18:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/27![Frontier logo]()
$271
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.
Sat 7/259:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Mon 7/279:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/29![Frontier logo]()
$302
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/279:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Mon 8/37:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 6/27![Frontier logo]()
$287
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/289:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Tue 8/117:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/28![Frontier logo]()
$276
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.
Tue 7/287:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Tue 8/46:34 pm
STL
- SAT
2 stops24h 20m
Frontier
Deal found 6/30![Frontier logo]()
$300
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.
Wed 7/299:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Thu 7/305:13 pm
ORD
- SAT
1 stop15h 43m
Frontier
Deal found 6/29![Frontier logo]()
$298
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Sun 8/29:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/29![Frontier logo]()
$301
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 7/315:35 pm
SAT
- MLI
1 stop5h 55m
American Airlines
Sat 8/87:22 pm
MLI
- SAT
1 stop5h 18m
American Airlines
Deal found 6/28![American Airlines logo]()
$306
One-way flights from San Antonio to IllinoisSearch for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated July 1, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated July 1, 2026.
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/59:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/27![Frontier logo]()
$104
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:26 pm
SAT
- ORD
1 stop17h 10m
Frontier
Deal found 6/30![Frontier logo]()
$109
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/289:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/30![Frontier logo]()
$113
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/28![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 6/26. 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 8/2610:24 pm
SAT
- ORD
1 stop20h 38m
Frontier
Deal found 6/26![Frontier logo]()
$118
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.
Tue 8/258:26 pm
SAT
- ORD
1 stop17h 10m
Frontier
Deal found 6/30![Frontier logo]()
$121
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/27![Frontier logo]()
$122
This Frontier deal was found by Cheapflights users on 6/26. 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.
Sat 8/229:51 am
SAT
- STL
1 stop6h 20m
Frontier
Deal found 6/26![Frontier logo]()
$124
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/30![Frontier logo]()
$124
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:34 pm
SAT
- ORD
1 stop13h 23m
Frontier
Deal found 6/30![Frontier logo]()
$128
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/254:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Deal found 6/30![Frontier logo]()
$129
This Trip.com deal was found by Cheapflights users on 6/26. 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 8/2410:24 pm
SAT
- STL
1 stop19h 26m
Frontier
Deal found 6/26![Frontier logo]()
$133
Find flight deals from San Antonio to Illinois
Keep the following information in mind while searching for San Antonio to Illinois flight deals. Data was last updated July 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $260 (Frontier) |
One-way from | $104 (Super.com) |
Popular in | June |
Cheapest in | September |
Average price | $385 |
Good round-trip deal | $352 or less |
Good one-way deal | $252 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from San Antonio 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 1, 2026.
Use the filters below to find and compare flights from San Antonio to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 9/17
11:08 am-7:15 pm
1 stop8h 07m
Lambert-St Louis
Sun 9/20
8:34 pm-9:02 am
1 stop12h 28m
$290
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Fri 8/7
6:52 pm-12:08 am
1 stop5h 16m
Moline Quad-City
Wed 8/19
6:00 am-12:53 pm
1 stop6h 53m
$306
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Fri 7/31
5:35 pm-11:30 pm
1 stop5h 55m
Moline Quad-City
Sat 8/8
7:22 pm-12:40 am
1 stop5h 18m
$306
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Thu 10/29
8:00 am-3:42 pm
1 stop7h 42m
Bloomington-Normal
Mon 11/2
4:23 pm-9:44 pm
1 stop5h 21m
$309
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Sat 8/1
6:57 pm-12:35 am
1 stop5h 38m
Bloomington-Normal
Mon 8/10
4:49 pm-10:50 pm
1 stop6h 01m
$309
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Fri 8/7
2:43 pm-10:19 pm
1 stop7h 36m
Moline Quad-City
Wed 8/19
6:00 am-3:54 pm
2 stops9h 54m
$311
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Thu 9/17
5:15 am-10:37 am
1 stop5h 22m
Chicago O'Hare Intl
Mon 9/21
5:10 pm-10:46 pm
1 stop5h 36m
$311
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Thu 9/10
5:15 am-12:59 pm
1 stop7h 44m
Chicago O'Hare Intl
Mon 9/14
8:55 am-3:55 pm
1 stop7h 00m
$311
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Wed 7/29
9:32 pm-5:37 pm
2 stops20h 05m
Lambert-St Louis
Wed 8/5
8:08 pm-6:54 pm
1 stop22h 46m
$315
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Tue 8/25
9:30 am-2:15 pm
1 stop4h 45m
Lambert-St Louis
Sat 8/29
7:25 am-3:43 pm
2 stops8h 18m
$316
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Antonio to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Antonio with our price prediction graph.
SAT-STL
SAT-ORD
SAT-MDW
SAT-MLI
SAT-RFD
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 San Antonio to Illinois
SAT-USIL
SAT-STL
SAT-ORD
SAT-MDW
SAT-MLI
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $96). Flying from San Antonio to Illinois in June is currently the most expensive (average of $231). 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 SAT to IL?
Find hourly flight availability from San Antonio 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 1, 2026.
It’s optimal to fly from San Antonio to Illinois in the evening. By choosing this option you can save up to 34% on the cost of your flight, compared to a flight at noon.
How much does it cost to fly round-trip from San Antonio to Illinois?
How far ahead should I book a flight from San Antonio to Illinois?
Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Antonio to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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 1, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest,Delta, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from San Antonio 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 San Antonio to Illinois
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Complete your trip
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Find flights from San Antonio to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on July 1, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
San Antonio to Illinois flights
Consider these flights traveling from San Antonio to Illinois.
Top 5 airlines flying from San Antonio to Illinois
Discover the top 5 airlines that operate flights from San Antonio 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 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$211 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$235 | Average$435 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$420 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$283 | Average$447 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$323 | FlexibilityNo cancel fee | On-timeN/A |