$127+ Cheap flights from Illinois to San Antonio (SAT)
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 8/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Aug 1 — Aug 81
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to San Antonio with Cheapflights
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Cheapest flights from Illinois to San AntonioExplore the most affordable flight options available from Illinois to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 2, 2026.
Explore the most affordable flight options available from Illinois to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 2, 2026.
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:46 pm
STL
- SAT
1 stop8h 53m
Frontier
Mon 9/2810:34 pm
SAT
- STL
1 stop13h 17m
Frontier
Deal found 6/30![Frontier logo]()
$258
This Travelocity 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/18:10 pm
STL
- SAT
1 stop14h 02m
Frontier
Mon 10/59:57 am
SAT
- STL
1 stop9h 42m
Frontier
Deal found 6/29![Frontier logo]()
$267
This CheapOair deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Wed 7/299:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Deal found 6/27![Frontier logo]()
$268
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.
Fri 7/107:15 am
ORD
- SAT
1 stop13h 22m
Frontier
Wed 8/59:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/30![Frontier logo]()
$276
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.
Sat 10/317:00 am
ORD
- SAT
1 stop11h 53m
Frontier
Wed 11/411:08 am
SAT
- ORD
1 stop22h 53m
Frontier
Deal found 6/30![Frontier logo]()
$277
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.
Tue 8/181:55 pm
MDW
- SAT
1 stop4h 00m
Southwest
Tue 8/259:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/1![Southwest logo]()
$277
This CheapOair deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2311:06 am
ORD
- SAT
1 stop24h 15m
Frontier
Sat 10/3111:08 am
SAT
- ORD
1 stop23h 53m
Frontier
Deal found 6/28![Frontier logo]()
$278
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.
Thu 8/1311:05 am
MDW
- SAT
Nonstop2h 35m
Southwest
Thu 8/205:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/29![Southwest logo]()
$278
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/234:09 pm
STL
- SAT
1 stop16h 47m
Frontier
Mon 7/277:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Deal found 6/29![Frontier logo]()
$278
This CheapOair deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/239:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Sun 7/267:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Deal found 6/27![Frontier logo]()
$279
This CheapOair deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/169:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Tue 7/219:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/28![Frontier logo]()
$280
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.
Wed 8/121:55 pm
MDW
- SAT
1 stop4h 00m
Southwest
Wed 8/197:55 am
SAT
- MDW
1 stop6h 50m
Southwest
Deal found 6/29![Southwest logo]()
$280
Best flights from Illinois to San AntonioDiscover carefully curated flight deals from Illinois to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 2, 2026.
Discover carefully curated flight deals from Illinois to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 2, 2026.
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.
Tue 8/1810:10 am
MDW
- SAT
2 stops5h 30m
Southwest
Tue 8/259:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/27![Southwest logo]()
$280
This United Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:30 am
ORD
- SAT
1 stop5h 59m
United Airlines
Wed 8/265:59 pm
SAT
- ORD
1 stop7h 00m
United Airlines
Deal found 6/28![United Airlines logo]()
$285
This Delta deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/125:00 pm
MLI
- SAT
1 stop7h 28m
Delta
Sat 12/194:25 pm
SAT
- MLI
1 stop6h 05m
Delta
Deal found 6/28![Delta logo]()
$293
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/249:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Sun 7/267:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Deal found 7/1![Frontier logo]()
$304
This American Airlines deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/204:49 pm
BMI
- SAT
1 stop7h 10m
American Airlines
Sun 8/237:28 am
SAT
- BMI
1 stop5h 32m
American Airlines
Deal found 7/1![American Airlines logo]()
$309
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.
Wed 8/511:10 am
MDW
- SAT
1 stop6h 45m
Southwest
Sat 8/811:10 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/30![Southwest logo]()
$281
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.
Sat 8/151:30 pm
ORD
- SAT
Nonstop3h 01m
United Airlines
Thu 8/205:59 pm
SAT
- ORD
1 stop7h 00m
United Airlines
Deal found 6/30![United Airlines logo]()
$291
This Delta deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:00 am
MLI
- SAT
2 stops9h 50m
Delta
Sat 10/108:00 am
SAT
- MLI
1 stop8h 22m
Delta
Deal found 7/1![Delta logo]()
$298
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Mon 8/105:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/28![Southwest logo]()
$291
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.
Tue 8/256:00 am
MLI
- SAT
2 stops9h 54m
Delta
Tue 9/15:15 am
SAT
- MLI
2 stops11h 07m
Delta
Deal found 6/27![Delta logo]()
$303
This American Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:04 pm
BMI
- SAT
1 stop6h 06m
American Airlines
Sun 7/196:57 pm
SAT
- BMI
1 stop5h 38m
American Airlines
Deal found 6/30![American Airlines logo]()
$339
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.
Wed 8/54:40 pm
MDW
- SAT
1 stop6h 15m
Southwest
Mon 8/103:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Deal found 6/29![Southwest logo]()
$293
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.
Wed 7/296:30 am
MLI
- SAT
1 stop5h 59m
United Airlines
Sun 8/25:30 am
SAT
- MLI
2 stops7h 06m
United Airlines
Deal found 6/27![United Airlines logo]()
$324
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.
Wed 8/266:00 am
MLI
- SAT
1 stop7h 38m
Delta
Sun 8/302:43 pm
SAT
- MLI
1 stop7h 36m
Delta
Deal found 6/27![Delta logo]()
$306
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.
Thu 8/137:10 am
MDW
- SAT
1 stop7h 00m
Southwest
Thu 8/203:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Deal found 6/29![Southwest logo]()
$306
This Delta deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2711:08 am
MLI
- SAT
1 stop5h 31m
Delta
Sat 8/292:43 pm
SAT
- MLI
1 stop7h 36m
Delta
Deal found 6/27![Delta logo]()
$306
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 9/18:45 am
ORD
- SAT
Nonstop3h 07m
United Airlines
Wed 9/25:27 pm
SAT
- ORD
Nonstop3h 00m
United Airlines
Deal found 6/29![United Airlines logo]()
$355
This Delta deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/204:24 pm
BMI
- SAT
1 stop8h 04m
Delta
Sun 8/237:55 am
SAT
- BMI
1 stop7h 46m
Delta
Deal found 6/27![Delta logo]()
$309
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.
Sat 8/1510:05 am
MDW
- SAT
2 stops5h 55m
Southwest
Sat 8/226:10 am
SAT
- MDW
2 stops8h 05m
Southwest
Deal found 7/1![Southwest logo]()
$311
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.
Sat 11/146:30 am
CMI
- SAT
2 stops9h 12m
United Airlines
Tue 11/176:43 am
SAT
- CMI
1 stop6h 07m
United Airlines
Deal found 6/29![United Airlines logo]()
$356
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 12/43:50 pm
EVV
- SAT
1 stop7h 02m
American Airlines
Wed 12/910:33 am
SAT
- EVV
1 stop4h 47m
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.
Wed 7/224:18 pm
BMI
- SAT
1 stop8h 02m
Delta
Sat 7/255:20 am
SAT
- BMI
1 stop6h 03m
Delta
Deal found 6/28![Delta logo]()
$309
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.
Mon 7/68:58 pm
ORD
- SAT
2 stops23h 39m
Frontier
Thu 7/99:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/1![Frontier logo]()
$511
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.
Tue 7/283:20 pm
MDW
- SAT
1 stop4h 00m
Southwest
Mon 8/33:20 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/30![Southwest logo]()
$325
This United Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1310:40 am
ORD
- SAT
1 stop5h 03m
United Airlines
Sun 8/166:30 am
SAT
- ORD
Nonstop3h 00m
United Airlines
Deal found 6/28![United Airlines logo]()
$364
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.
Tue 9/111:08 am
MLI
- SAT
2 stops11h 26m
Delta
Sun 9/62:43 pm
SAT
- MLI
1 stop7h 36m
Delta
Deal found 6/29![Delta logo]()
$311
This American Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2312:46 pm
EVV
- SAT
1 stop7h 54m
American Airlines
Sat 7/256:57 pm
SAT
- EVV
1 stop5h 26m
American Airlines
Deal found 6/30![American Airlines logo]()
$467
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/3010:35 am
MDW
- SAT
Nonstop2h 40m
Southwest
Tue 8/44:20 pm
SAT
- MDW
1 stop6h 50m
Southwest
Deal found 6/28![Southwest logo]()
$326
This United Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/225:43 pm
PIA
- SAT
1 stop5h 14m
United Airlines
Sat 7/255:30 am
SAT
- PIA
2 stops7h 08m
United Airlines
Deal found 6/28![United Airlines logo]()
$364
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:25 am
ORD
- SAT
Nonstop3h 04m
United Airlines
Wed 7/227:20 pm
SAT
- ORD
1 stop5h 25m
United Airlines
Deal found 6/26![United Airlines logo]()
$371
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated July 2, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated July 2, 2026 and is based on user searches.
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.
Fri 7/107:15 am
ORD
- SAT
1 stop13h 22m
Frontier
Wed 8/59:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/30![Frontier logo]()
$276
This CheapOair deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/169:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Tue 7/219:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/28![Frontier logo]()
$280
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/234:09 pm
STL
- SAT
1 stop16h 47m
Frontier
Mon 7/277:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Deal found 6/29![Frontier logo]()
$278
This CheapOair deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/239:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Sun 7/267:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Deal found 6/27![Frontier logo]()
$279
This CheapOair deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Wed 7/299:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Deal found 6/27![Frontier logo]()
$268
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/315:13 pm
ORD
- SAT
1 stop22h 28m
Frontier
Sun 8/29:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/30![Frontier logo]()
$278
This United Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/51:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Sat 8/84:35 pm
SAT
- ORD
1 stop6h 14m
United Airlines
Deal found 6/30![United Airlines logo]()
$281
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.
Wed 8/121:55 pm
MDW
- SAT
1 stop4h 00m
Southwest
Wed 8/197:55 am
SAT
- MDW
1 stop6h 50m
Southwest
Deal found 6/29![Southwest logo]()
$280
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.
Thu 8/1311:05 am
MDW
- SAT
Nonstop2h 35m
Southwest
Thu 8/205:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/29![Southwest logo]()
$278
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.
Sat 8/156:45 am
MDW
- SAT
1 stop7h 05m
Southwest
Sat 8/2211:10 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/1![Southwest logo]()
$281
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.
Tue 8/181:55 pm
MDW
- SAT
1 stop4h 00m
Southwest
Tue 8/259:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/1![Southwest logo]()
$277
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:11 pm
ORD
- SAT
1 stop25h 18m
Frontier
Fri 8/288:26 pm
SAT
- ORD
1 stop17h 10m
Frontier
Deal found 6/30![Frontier logo]()
$277
One-way flights from Illinois to San AntonioSearch for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated July 2, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated July 2, 2026.
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/17:29 am
ORD
- SAT
1 stop13h 08m
Frontier
Deal found 7/1![Frontier logo]()
$127
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 8/252:41 pm
ORD
- SAT
1 stop28h 50m
Frontier
Deal found 6/30![Frontier logo]()
$128
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/69:57 pm
ORD
- SAT
1 stop20h 57m
Frontier
Deal found 7/1![Frontier logo]()
$129
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:46 pm
STL
- SAT
1 stop8h 53m
Frontier
Deal found 6/28![Frontier logo]()
$129
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 8/157:29 am
ORD
- SAT
1 stop13h 08m
Frontier
Deal found 6/30![Frontier logo]()
$130
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.
Sat 8/292:41 pm
ORD
- SAT
1 stop28h 50m
Frontier
Deal found 7/1![Frontier logo]()
$133
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.
Sat 7/259:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/30![Frontier logo]()
$134
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 8/118:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Deal found 6/30![Frontier logo]()
$134
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.
Thu 8/207:58 pm
STL
- SAT
1 stop23h 33m
Frontier
Deal found 7/1![Frontier logo]()
$135
This American Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:52 pm
ORD
- SAT
Nonstop2h 48m
American Airlines
Deal found 6/30![American Airlines logo]()
$136
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 7/299:00 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 7/1![Southwest logo]()
$136
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.
Fri 8/79:57 pm
ORD
- SAT
1 stop20h 57m
Frontier
Deal found 6/30![Frontier logo]()
$138
Find flight deals from Illinois to San Antonio
Keep the following information in mind while searching for Illinois to San Antonio flight deals. Data was last updated July 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $258 (Orbitz) |
One-way from | $127 (Expedia) |
Popular in | April |
Cheapest in | October |
Average price | $370 |
Good round-trip deal | $336 or less |
Good one-way deal | $148 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Antonio that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 2, 2026.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Tue 8/18
10:10 am-3:40 pm
2 stops5h 30m
San Antonio
Tue 8/25
9:25 am-12:00 pm
Nonstop2h 35m
$280
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Wed 8/5
11:10 am-5:55 pm
1 stop6h 45m
San Antonio
Sat 8/8
11:10 am-1:45 pm
Nonstop2h 35m
$281
ChicagoSan Antonio
ORD - SAT
ORDSAT
Chicago O'Hare Intl
Wed 8/26
7:30 am-1:29 pm
1 stop5h 59m
San Antonio
Wed 8/26
5:59 pm-12:59 am
1 stop7h 00m
$285
ChicagoSan Antonio
ORD - SAT
ORDSAT
Chicago O'Hare Intl
Sat 8/15
1:30 pm-4:31 pm
Nonstop3h 01m
San Antonio
Thu 8/20
5:59 pm-12:59 am
1 stop7h 00m
$291
Quickest round-trip
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Thu 8/6
8:35 pm-11:15 pm
Nonstop2h 40m
San Antonio
Mon 8/10
5:00 am-7:35 am
Nonstop2h 35m
$291
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Sat 12/12
5:00 pm-12:28 am
1 stop7h 28m
San Antonio
Sat 12/19
4:25 pm-10:30 pm
1 stop6h 05m
$293
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Wed 8/5
4:40 pm-10:55 pm
1 stop6h 15m
San Antonio
Mon 8/10
3:30 pm-7:20 pm
1 stop3h 50m
$293
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Tue 10/6
6:00 am-3:50 pm
2 stops9h 50m
San Antonio
Sat 10/10
8:00 am-4:22 pm
1 stop8h 22m
$298
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Tue 8/25
6:00 am-3:54 pm
2 stops9h 54m
San Antonio
Tue 9/1
5:15 am-4:22 pm
2 stops11h 07m
$303
ChicagoSan Antonio
ORD - SAT
ORDSAT
Chicago O'Hare Intl
Fri 7/24
9:57 pm-6:44 pm
1 stop20h 47m
San Antonio
Sun 7/26
7:39 pm-8:52 pm
1 stop25h 13m
$304
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to San Antonio
Have a flexible travel schedule? Discover the best time to fly to San Antonio from Illinois with our price prediction graph.
ORD-SAT
MDW-SAT
STL-SAT
MLI-SAT
BMI-SAT
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 Illinois to San Antonio
USIL-SAT
ORD-SAT
MDW-SAT
STL-SAT
MLI-SAT
What is the cheapest month to book a flight from Illinois to San Antonio?
Currently, January is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $88). Flying from Illinois to San Antonio in June is currently the most expensive (average of $202). 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 IL to SAT?
Find hourly flight availability from Illinois to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 2, 2026.
It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 9% on the cost of your flight, compared to a flight in the afternoon.
Weekly flight availability from Illinois to San Antonio
Explore weekly flight availability from Illinois to San Antonio. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 2, 2026.
The most flights from USIL to SAT are scheduled on a Thursday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).
How much does it cost to fly round-trip from Illinois to San Antonio?
How far ahead should I book a flight from Illinois to San Antonio?
Booking 46 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to San Antonio. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Illinois to San Antonio?
Use this chart to determine the cheapest time to fly round-trip from Illinois to San Antonio. Price data was last updated on June 27, 2026.
Travelers seeking maximum savings on their Illinois to San Antonio flight should consider departing on Friday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Antonio. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
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Alternative routes for Illinois to San Antonio
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Complete your trip
Complete your trip to San Antonio by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to San Antonio by cabin class
Find flights from Illinois to San Antonio, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and San Antonio flights
Browse other Illinois and San Antonio flight options. Last updated on July 2, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Antonio
Explore flights to San Antonio departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on July 2, 2026.
Illinois to San Antonio flights
Consider these flights traveling from Illinois to San Antonio.
Top 5 airlines flying from Illinois to San Antonio
Discover the top 5 airlines that operate flights from Illinois to San Antonio. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$226 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$218 | Average$361 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$356 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$235 | Average$443 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$241 | Average$402 | FlexibilityNo cancel fee | On-time71% |