$70+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Mar 15 — Mar 221
1 adult, Economy
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Find cheap flights from Illinois to San Antonio with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to San Antonio
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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 February 13, 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 February 13, 2026.
This Priceline deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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.
Thu 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
Mon 3/21:52 pm
SAT
- STL
1 stop10h 07m
Frontier
Deal found 2/9![Frontier logo]()
$154
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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.
Thu 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
Sun 3/18:24 pm
SAT
- STL
1 stop27h 35m
Frontier
Deal found 2/9![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Frontier
Mon 3/98:53 pm
SAT
- STL
1 stop26h 26m
Frontier
Deal found 2/11![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Multiple Airlines
Wed 3/116:00 am
SAT
- STL
1 stop17h 19m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/28:22 pm
STL
- SAT
2 stops37h 08m
Multiple Airlines
Wed 3/116:00 am
SAT
- STL
1 stop17h 19m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$172
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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.
Mon 2/231:54 pm
STL
- SAT
1 stop26h 47m
Frontier
Thu 2/268:20 pm
SAT
- STL
1 stop16h 49m
Frontier
Deal found 2/9![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Multiple Airlines
Tue 3/1010:26 am
SAT
- STL
2 stops24h 11m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Frontier
Tue 3/106:45 am
SAT
- STL
1 stop27h 04m
Frontier
Deal found 2/10![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/188:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Mon 3/232:40 pm
SAT
- STL
1 stop8h 39m
Frontier
Deal found 2/10![Frontier logo]()
$189
This CheapOair deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
- SAT
1 stop26h 34m
Frontier
Fri 2/2710:48 pm
SAT
- STL
1 stop18h 58m
Frontier
Deal found 2/13![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Multiple Airlines
Thu 3/510:26 am
SAT
- STL
2 stops25h 23m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$195
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/253:45 pm
BMI
- SAT
1 stop7h 22m
American Airlines
Tue 3/315:21 pm
SAT
- BMI
1 stop6h 27m
American Airlines
Deal found 2/11![American Airlines logo]()
$269
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 February 13, 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 February 13, 2026.
This CheapOair deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/158:12 pm
STL
- SAT
1 stop18h 27m
Frontier
Mon 5/1810:23 am
SAT
- STL
1 stop12h 56m
Frontier
Deal found 2/12![Frontier logo]()
$171
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 7/15:29 pm
STL
- SAT
1 stop5h 35m
United Airlines
Sat 7/46:49 am
SAT
- STL
1 stop5h 22m
United Airlines
Deal found 2/9![United Airlines logo]()
$197
This Delta deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 5/287:09 pm
STL
- SAT
1 stop5h 31m
Delta
Mon 6/16:24 pm
SAT
- STL
1 stop5h 35m
Delta
Deal found 2/10![Delta logo]()
$207
This American Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/75:21 pm
STL
- SAT
1 stop6h 38m
American Airlines
Fri 4/105:00 am
SAT
- STL
1 stop3h 54m
American Airlines
Deal found 2/12![American Airlines logo]()
$232
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/248:35 pm
MDW
- SAT
Nonstop2h 55m
Southwest
Tue 3/317:45 pm
SAT
- MDW
1 stop4h 20m
Southwest
Deal found 2/10![Southwest logo]()
$287
This CheapOair deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 2/271:59 pm
STL
- SAT
1 stop5h 38m
Frontier
Sun 3/18:24 pm
SAT
- STL
1 stop27h 35m
Frontier
Deal found 2/9![Frontier logo]()
$171
This Frontier deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
Mon 3/21:52 pm
SAT
- STL
1 stop10h 07m
Frontier
Deal found 2/13![Frontier logo]()
$181
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 5/16:50 pm
STL
- SAT
1 stop5h 44m
Delta
Mon 5/46:12 pm
SAT
- STL
1 stop5h 01m
Delta
Deal found 2/9![Delta logo]()
$207
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 5/136:00 am
STL
- SAT
1 stop4h 47m
United Airlines
Mon 5/186:02 pm
SAT
- STL
1 stop4h 28m
United Airlines
Deal found 2/10![United Airlines logo]()
$232
This CheapOair deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
Sun 3/18:24 pm
SAT
- STL
1 stop27h 35m
Frontier
Deal found 2/13![Frontier logo]()
$192
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/252:56 pm
BMI
- SAT
2 stops7h 59m
American Airlines
Tue 3/319:13 am
SAT
- BMI
1 stop6h 02m
American Airlines
Deal found 2/11![American Airlines logo]()
$274
This Southwest deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/178:35 pm
MDW
- SAT
Nonstop2h 55m
Southwest
Tue 3/313:55 pm
SAT
- MDW
1 stop6h 00m
Southwest
Deal found 2/12![Southwest logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 5/118:12 pm
STL
- SAT
1 stop18h 07m
Frontier
Mon 5/183:14 pm
SAT
- STL
2 stops32h 05m
Frontier
Deal found 2/9![Frontier logo]()
$219
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 3/313:20 pm
MLI
- SAT
1 stop7h 33m
United Airlines
Tue 4/76:49 am
SAT
- MLI
1 stop7h 00m
United Airlines
Deal found 2/9![United Airlines logo]()
$279
This American Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/103:31 pm
MLI
- SAT
1 stop7h 23m
American Airlines
Tue 3/245:19 am
SAT
- MLI
1 stop8h 02m
American Airlines
Deal found 2/12![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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.
Mon 4/135:12 pm
MLI
- SAT
1 stop5h 13m
Delta
Tue 4/215:00 pm
SAT
- MLI
1 stop5h 35m
Delta
Deal found 2/9![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/289:35 pm
MDW
- SAT
Nonstop2h 55m
Southwest
Wed 4/16:15 pm
SAT
- MDW
1 stop5h 50m
Southwest
Deal found 2/12![Southwest logo]()
$298
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/188:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Mon 3/232:40 pm
SAT
- STL
2 stops19h 52m
Frontier
Deal found 2/10![Frontier logo]()
$227
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 5/205:30 pm
MLI
- SAT
1 stop5h 24m
United Airlines
Wed 5/275:24 pm
SAT
- MLI
1 stop6h 35m
United Airlines
Deal found 2/9![United Airlines logo]()
$279
This American Airlines deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/283:45 pm
BMI
- SAT
1 stop6h 13m
American Airlines
Wed 3/45:17 am
SAT
- BMI
1 stop5h 44m
American Airlines
Deal found 2/13![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 4/145:12 pm
MLI
- SAT
1 stop7h 18m
Delta
Sat 4/184:20 pm
SAT
- MLI
1 stop6h 15m
Delta
Deal found 2/9![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1111:05 am
MDW
- SAT
Nonstop3h 00m
Southwest
Sat 3/147:50 pm
SAT
- MDW
1 stop5h 00m
Southwest
Deal found 2/12![Southwest logo]()
$298
This CheapOair deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/238:12 pm
STL
- SAT
1 stop28h 05m
Frontier
Thu 3/266:45 am
SAT
- STL
1 stop27h 04m
Frontier
Deal found 2/12![Frontier logo]()
$229
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 5/15:30 pm
MLI
- SAT
1 stop5h 24m
United Airlines
Fri 5/85:29 pm
SAT
- MLI
1 stop6h 30m
United Airlines
Deal found 2/9![United Airlines logo]()
$279
This American Airlines deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:50 pm
PIA
- SAT
1 stop5h 06m
American Airlines
Tue 3/245:19 am
SAT
- PIA
1 stop7h 28m
American Airlines
Deal found 2/13![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 4/145:10 am
ORD
- SAT
1 stop6h 11m
Delta
Wed 4/155:10 am
SAT
- ORD
1 stop7h 35m
Delta
Deal found 2/11![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/1710:10 am
MDW
- SAT
Nonstop2h 50m
Southwest
Tue 4/219:05 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 2/10![Southwest logo]()
$302
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/83:20 pm
MLI
- SAT
1 stop7h 33m
United Airlines
Sat 4/116:49 am
SAT
- MLI
1 stop5h 38m
United Airlines
Deal found 2/10![United Airlines logo]()
$279
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/56:55 pm
PIA
- SAT
1 stop5h 01m
American Airlines
Mon 3/95:53 pm
SAT
- PIA
1 stop6h 03m
American Airlines
Deal found 2/11![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/316:07 pm
MDW
- SAT
1 stop6h 31m
Delta
Tue 4/75:10 am
SAT
- MDW
1 stop7h 19m
Delta
Deal found 2/11![Delta logo]()
$297
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated February 13, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated February 13, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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.
Mon 2/231:54 pm
STL
- SAT
1 stop26h 47m
Frontier
Thu 2/268:20 pm
SAT
- STL
1 stop16h 49m
Frontier
Deal found 2/9![Frontier logo]()
$181
This CheapOair deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
- SAT
1 stop26h 34m
Frontier
Fri 2/2710:48 pm
SAT
- STL
1 stop18h 58m
Frontier
Deal found 2/13![Frontier logo]()
$192
This Priceline deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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.
Thu 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
Mon 3/21:52 pm
SAT
- STL
1 stop10h 07m
Frontier
Deal found 2/9![Frontier logo]()
$154
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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.
Thu 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
Sun 3/18:24 pm
SAT
- STL
1 stop27h 35m
Frontier
Deal found 2/9![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Frontier
Mon 3/98:53 pm
SAT
- STL
1 stop26h 26m
Frontier
Deal found 2/11![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Multiple Airlines
Thu 3/56:00 am
SAT
- STL
1 stop17h 59m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Multiple Airlines
Tue 3/1010:26 am
SAT
- STL
2 stops24h 11m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/288:17 pm
STL
- SAT
1 stop20h 02m
Frontier
Tue 3/106:45 am
SAT
- STL
1 stop27h 04m
Frontier
Deal found 2/10![Frontier logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/28:22 pm
STL
- SAT
2 stops37h 08m
Multiple Airlines
Wed 3/116:00 am
SAT
- STL
1 stop17h 19m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$172
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/35:22 pm
MLI
- SAT
1 stop5h 50m
United Airlines
Tue 3/101:23 pm
SAT
- MLI
1 stop7h 25m
United Airlines
Deal found 2/10![United Airlines logo]()
$279
This Frontier deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/188:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Mon 3/232:40 pm
SAT
- STL
1 stop8h 39m
Frontier
Deal found 2/10![Frontier logo]()
$189
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/253:45 pm
BMI
- SAT
1 stop7h 22m
American Airlines
Tue 3/315:21 pm
SAT
- BMI
1 stop6h 27m
American Airlines
Deal found 2/11![American Airlines logo]()
$269
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 February 13, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated February 13, 2026.
This Mytrip deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/48:30 am
ORD
- SAT
1 stop28h 42m
Frontier
Deal found 2/10![Frontier logo]()
$70
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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.
Fri 3/66:05 am
MDW
- SAT
1 stop8h 46m
Frontier
Deal found 2/10![Frontier logo]()
$72
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/258:00 am
ORD
- SAT
1 stop9h 59m
Frontier
Deal found 2/10![Frontier logo]()
$73
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/259:14 am
MDW
- SAT
1 stop8h 45m
Frontier
Deal found 2/10![Frontier logo]()
$73
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/188:00 am
ORD
- SAT
1 stop9h 59m
Frontier
Deal found 2/10![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 5/1110:55 am
ORD
- SAT
1 stop27h 24m
Frontier
Deal found 2/11![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 5/118:12 pm
STL
- SAT
1 stop18h 07m
Frontier
Deal found 2/10![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 5/121:27 pm
ORD
- SAT
1 stop20h 03m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$79
This Mytrip deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/38:16 pm
ORD
- SAT
1 stop13h 14m
Spirit Airlines
Deal found 2/10![Spirit Airlines logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/265:16 pm
MDW
- SAT
1 stop22h 59m
Frontier
Deal found 2/10![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 2/271:59 pm
STL
- SAT
1 stop5h 38m
Frontier
Deal found 2/9![Frontier logo]()
$80
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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.
Fri 3/65:05 am
ORD
- SAT
1 stop9h 46m
Frontier
Deal found 2/10![Frontier logo]()
$83
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 February 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $154 (Priceline) |
One-way from | $70 (Mytrip) |
Popular in | February |
Cheapest in | October |
Average price | $419 |
Good round-trip deal | $325 or less |
Good one-way deal | $166 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 February 13, 2026.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.
Fly from
Illinois
Fly to
San Antonio
Route
Depart
Return
Price
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Fri 5/15
8:12 pm-2:39 pm
1 stop18h 27m
San Antonio
Mon 5/18
10:23 am-11:19 pm
1 stop12h 56m
$171
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Fri 2/27
1:59 pm-7:37 pm
1 stop5h 38m
San Antonio
Sun 3/1
8:24 pm-11:59 pm
1 stop27h 35m
$171
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Thu 2/26
10:11 pm-9:58 am
1 stop11h 47m
San Antonio
Mon 3/2
1:52 pm-11:59 pm
1 stop10h 07m
$181
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Thu 2/26
10:11 pm-9:58 am
1 stop11h 47m
San Antonio
Sun 3/1
8:24 pm-11:59 pm
1 stop27h 35m
$192
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Wed 7/1
5:29 pm-11:04 pm
1 stop5h 35m
San Antonio
Sat 7/4
6:49 am-12:11 pm
1 stop5h 22m
$197
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Thu 5/28
7:09 pm-12:40 am
1 stop5h 31m
San Antonio
Mon 6/1
6:24 pm-11:59 pm
1 stop5h 35m
$207
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Fri 5/1
6:50 pm-12:34 am
1 stop5h 44m
San Antonio
Mon 5/4
6:12 pm-11:13 pm
1 stop5h 01m
$207
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Mon 5/11
8:12 pm-2:19 pm
1 stop18h 07m
San Antonio
Mon 5/18
3:14 pm-11:19 pm
2 stops32h 05m
$219
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Wed 3/18
8:12 pm-9:06 am
1 stop12h 54m
San Antonio
Mon 3/23
2:40 pm-10:32 am
2 stops19h 52m
$227
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Mon 3/23
8:12 pm-12:17 am
1 stop28h 05m
San Antonio
Thu 3/26
6:45 am-9:49 am
1 stop27h 04m
$229
Showing 1-10 of 60 results
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.
STL-SAT
BMI-SAT
MDW-SAT
MLI-SAT
PIA-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
STL-SAT
BMI-SAT
MDW-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 $59). Flying from Illinois to San Antonio in September is currently the most expensive (average of $154). 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 February 13, 2026.
It’s optimal to fly from Illinois to San Antonio in the afternoon. By choosing this option you can save up to 7% on the cost of your flight, compared to a flight at noon.
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 February 7, 2026.
Travelers seeking maximum savings on their Illinois to San Antonio flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 February 13, 2026.
The most flights from USIL to SAT are scheduled on a Friday (22 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (9 on average).
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 to San Antonio by adding a car rental and/or hotel reservation to your travel itinerary.
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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 February 13, 2026.
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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 February 13, 2026.
Illinois to San Antonio flights
Consider these flights traveling from Illinois to San Antonio.
Top 6 airlines flying from Illinois to San Antonio
Discover the top 6 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 February 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$198 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$167 | Average$253 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$205 | Average$404 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$208 | Average$355 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$411 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$258 | Average$318 | FlexibilityNo cancel fee | On-timeN/A |