$111+ 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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Jul 14 — Jul 211
Round-trip
1 adult, Economy
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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 June 14, 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 June 14, 2026.
This Frontier deal was found by Cheapflights users on 6/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Mon 8/109:51 am
SAT
- STL
1 stop14h 08m
Frontier
Deal found 6/11![Frontier logo]()
$263
This CheapOair deal was found by Cheapflights users on 6/12. 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.
Tue 7/148:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Tue 7/219:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Deal found 6/12![Frontier logo]()
$264
This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:20 am
ORD
- SAT
1 stop12h 51m
Frontier
Wed 7/89:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/12![Frontier logo]()
$270
This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:20 am
ORD
- SAT
1 stop12h 51m
Frontier
Tue 7/79:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/12![Frontier logo]()
$271
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/3111:30 am
MDW
- SAT
Nonstop2h 40m
Southwest
Wed 11/49:45 am
SAT
- MDW
2 stops7h 25m
Southwest
Deal found 6/11![Southwest logo]()
$273
This CheapOair deal was found by Cheapflights users on 6/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/27:38 pm
STL
- SAT
1 stop23h 18m
Frontier
Tue 7/77:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Deal found 6/10![Frontier logo]()
$273
This CheapOair deal was found by Cheapflights users on 6/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/241:02 pm
ORD
- SAT
1 stop8h 37m
Frontier
Sun 9/277:49 pm
SAT
- ORD
1 stop14h 12m
Frontier
Deal found 6/10![Frontier logo]()
$274
This Mytrip deal was found by Cheapflights users on 6/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/105:13 pm
ORD
- SAT
1 stop22h 28m
Frontier
Sat 7/119:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/12![Frontier logo]()
$276
This Delta deal was found by Cheapflights users on 6/9. 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.
Sat 9/2612:40 pm
ORD
- SAT
1 stop8h 34m
Delta
Tue 9/2910:59 am
SAT
- ORD
1 stop7h 46m
Delta
Deal found 6/9![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 6/10. 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.
Sat 9/2611:25 am
MDW
- SAT
1 stop7h 13m
Delta
Wed 9/305:15 am
SAT
- MDW
1 stop7h 19m
Delta
Deal found 6/10![Delta logo]()
$277
This CheapOair deal was found by Cheapflights users on 6/11. 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 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
Mon 7/209:51 am
SAT
- ORD
1 stop13h 19m
Frontier
Deal found 6/11![Frontier logo]()
$278
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/67:30 am
MDW
- SAT
1 stop6h 10m
Southwest
Wed 8/127:10 am
SAT
- MDW
1 stop6h 45m
Southwest
Deal found 6/11![Southwest logo]()
$278
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 June 14, 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 June 14, 2026.
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Tue 6/3011:09 am
MLI
- SAT
1 stop7h 28m
American Airlines
Sat 8/85:59 am
SAT
- MLI
1 stop5h 14m
American Airlines
Deal found 6/11![American Airlines logo]()
$293
This Delta deal was found by Cheapflights users on 6/11. 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.
Sat 10/1011:00 am
MLI
- SAT
1 stop6h 18m
Delta
Wed 10/144:25 pm
SAT
- MLI
1 stop6h 05m
Delta
Deal found 6/11![Delta logo]()
$293
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/13:47 pm
MLI
- SAT
1 stop7h 10m
United Airlines
Sat 8/85:30 am
SAT
- MLI
2 stops8h 26m
United Airlines
Deal found 6/12![United Airlines logo]()
$298
This Southwest deal was found by Cheapflights users on 6/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:00 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Wed 7/1512:55 pm
SAT
- MDW
1 stop5h 35m
Southwest
Deal found 6/9![Southwest logo]()
$315
This Delta deal was found by Cheapflights users on 6/10. 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.
Fri 10/95:00 pm
MLI
- SAT
1 stop7h 28m
Delta
Wed 10/1410:45 am
SAT
- MLI
1 stop5h 37m
Delta
Deal found 6/10![Delta logo]()
$306
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:32 am
MLI
- SAT
2 stops9h 21m
United Airlines
Sat 10/176:35 am
SAT
- MLI
1 stop6h 02m
United Airlines
Deal found 6/8![United Airlines logo]()
$308
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/57:13 pm
PIA
- SAT
1 stop4h 57m
American Airlines
Sat 7/115:01 am
SAT
- PIA
1 stop6h 54m
American Airlines
Deal found 6/9![American Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 6/10. 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.
Wed 7/85:05 pm
MLI
- SAT
1 stop7h 15m
Delta
Wed 7/152:35 pm
SAT
- MLI
1 stop7h 56m
Delta
Deal found 6/10![Delta logo]()
$306
This Southwest deal was found by Cheapflights users on 6/10. 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 7/219:00 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Sat 7/259:20 am
SAT
- MDW
2 stops7h 40m
Southwest
Deal found 6/10![Southwest logo]()
$351
This United Airlines deal was found by Cheapflights users on 6/10. 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 7/217:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Sat 7/251:25 pm
SAT
- ORD
Nonstop3h 02m
United Airlines
Deal found 6/10![United Airlines logo]()
$336
This Delta deal was found by Cheapflights users on 6/11. 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.
Wed 10/285:55 am
MLI
- SAT
1 stop7h 27m
Delta
Mon 11/22:10 pm
SAT
- MLI
1 stop8h 20m
Delta
Deal found 6/11![Delta logo]()
$306
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/47:29 am
CMI
- SAT
1 stop7h 28m
American Airlines
Fri 7/105:35 pm
SAT
- CMI
1 stop4h 24m
American Airlines
Deal found 6/9![American Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 6/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/411:05 am
MDW
- SAT
Nonstop2h 35m
Southwest
Mon 9/75:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/13![Southwest logo]()
$360
This Delta deal was found by Cheapflights users on 6/10. 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 8/204:24 pm
BMI
- SAT
1 stop8h 04m
Delta
Sun 8/235:20 am
SAT
- BMI
1 stop6h 07m
Delta
Deal found 6/10![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/9. 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 8/1812:59 pm
STL
- SAT
2 stops9h 40m
United Airlines
Wed 8/195:30 am
SAT
- STL
2 stops10h 08m
United Airlines
Deal found 6/9![United Airlines logo]()
$347
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/266:02 pm
BMI
- SAT
1 stop5h 57m
American Airlines
Sun 6/286:24 pm
SAT
- BMI
1 stop6h 11m
American Airlines
Deal found 6/9![American Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 6/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/298:25 am
STL
- SAT
Nonstop2h 10m
Southwest
Tue 8/46:50 am
SAT
- STL
1 stop7h 05m
Southwest
Deal found 6/13![Southwest logo]()
$363
This Delta deal was found by Cheapflights users on 6/11. 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.
Fri 10/912:00 pm
BMI
- SAT
1 stop8h 22m
Delta
Mon 10/128:00 am
SAT
- BMI
1 stop7h 16m
Delta
Deal found 6/11![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/9. 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 7/110:44 am
PIA
- SAT
1 stop5h 45m
United Airlines
Sun 7/56:40 am
SAT
- PIA
1 stop5h 57m
United Airlines
Deal found 6/9![United Airlines logo]()
$361
This American Airlines deal was found by Cheapflights users on 6/13. 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.
Sun 7/126:00 pm
BMI
- SAT
1 stop6h 10m
American Airlines
Sun 7/196:57 pm
SAT
- BMI
1 stop5h 38m
American Airlines
Deal found 6/13![American Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 6/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:30 am
STL
- SAT
Nonstop2h 05m
Southwest
Sat 8/292:25 pm
SAT
- STL
1 stop5h 55m
Southwest
Deal found 6/9![Southwest logo]()
$371
This Delta deal was found by Cheapflights users on 6/9. 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.
Thu 9/36:00 am
MLI
- SAT
1 stop5h 10m
Delta
Thu 9/102:10 pm
SAT
- MLI
1 stop8h 20m
Delta
Deal found 6/9![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 6/9. 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.
Mon 7/207:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Sat 7/251:25 pm
SAT
- ORD
Nonstop3h 02m
United Airlines
Deal found 6/9![United Airlines logo]()
$367
This Southwest deal was found by Cheapflights users on 6/12. 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 7/147:10 am
MDW
- SAT
1 stop4h 20m
Southwest
Fri 7/171:50 pm
SAT
- MDW
2 stops6h 35m
Southwest
Deal found 6/12![Southwest logo]()
$377
This American Airlines deal was found by Cheapflights users on 6/11. 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 8/204:49 pm
BMI
- SAT
1 stop7h 10m
American Airlines
Sun 8/235:00 am
SAT
- BMI
2 stops8h 00m
American Airlines
Deal found 6/11![American Airlines logo]()
$389
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:45 am
ORD
- SAT
Nonstop3h 07m
United Airlines
Sun 9/65:30 pm
SAT
- ORD
Nonstop3h 00m
United Airlines
Deal found 6/12![United Airlines logo]()
$373
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/29:40 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Sat 8/86:10 am
SAT
- MDW
2 stops8h 05m
Southwest
Deal found 6/11![Southwest logo]()
$378
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/314:18 pm
BMI
- SAT
1 stop8h 02m
Delta
Sun 8/25:20 am
SAT
- BMI
1 stop6h 03m
Delta
Deal found 6/12![Delta logo]()
$354
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 12/56:45 am
MLI
- SAT
1 stop5h 25m
United Airlines
Wed 12/96:40 am
SAT
- MLI
1 stop5h 55m
United Airlines
Deal found 6/8![United Airlines logo]()
$373
This American Airlines deal was found by Cheapflights users on 6/13. 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.
Wed 7/14:47 pm
PIA
- SAT
1 stop6h 18m
American Airlines
Sat 7/45:01 am
SAT
- PIA
1 stop6h 54m
American Airlines
Deal found 6/13![American Airlines logo]()
$424
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated June 14, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated June 14, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:20 am
ORD
- SAT
1 stop12h 51m
Frontier
Wed 7/89:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/12![Frontier logo]()
$270
This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:20 am
ORD
- SAT
1 stop12h 51m
Frontier
Tue 7/79:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/12![Frontier logo]()
$271
This CheapOair deal was found by Cheapflights users on 6/9. 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 7/39:48 pm
ORD
- SAT
1 stop21h 08m
Frontier
Fri 7/107:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Deal found 6/9![Frontier logo]()
$280
This Trip.com deal was found by Cheapflights users on 6/10. 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.
Wed 7/89:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Wed 7/159:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/10![Frontier logo]()
$282
This Mytrip deal was found by Cheapflights users on 6/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/105:13 pm
ORD
- SAT
1 stop22h 28m
Frontier
Sat 7/119:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/12![Frontier logo]()
$276
This CheapOair deal was found by Cheapflights users on 6/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/117:15 am
ORD
- SAT
1 stop13h 22m
Frontier
Sun 7/127:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Deal found 6/11![Frontier logo]()
$274
This CheapOair deal was found by Cheapflights users on 6/12. 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.
Tue 7/148:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Tue 7/219:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Deal found 6/12![Frontier logo]()
$264
This CheapOair deal was found by Cheapflights users on 6/13. 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.
Tue 7/147:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Mon 7/209:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Deal found 6/13![Frontier logo]()
$273
This CheapOair deal was found by Cheapflights users on 6/11. 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 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
Mon 7/209:51 am
SAT
- ORD
1 stop13h 19m
Frontier
Deal found 6/11![Frontier logo]()
$278
This CheapOair deal was found by Cheapflights users on 6/13. 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 7/167:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Mon 7/209:51 am
SAT
- STL
1 stop14h 08m
Frontier
Deal found 6/13![Frontier logo]()
$278
This CheapOair deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair 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
Mon 7/277:39 pm
SAT
- ORD
1 stop25h 13m
Frontier
Deal found 6/14![Frontier logo]()
$279
This Trip.com deal was found by Cheapflights users on 6/11. 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 Trip.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
Fri 7/319:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/11![Frontier logo]()
$283
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 June 14, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated June 14, 2026.
This Booking.com deal was found by Cheapflights users on 6/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/59:57 pm
ORD
- SAT
1 stop20h 57m
Frontier
Deal found 6/11![Frontier logo]()
$111
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Tue 9/810:00 pm
ORD
- SAT
Nonstop2h 48m
American Airlines
Deal found 6/11![American Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/11![Southwest logo]()
$117
This Super.com deal was found by Cheapflights users on 6/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/219:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/12![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 6/13. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/13![Frontier logo]()
$121
This Trip.com deal was found by Cheapflights users on 6/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/13![Frontier logo]()
$125
This eDestinos deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/309:48 pm
ORD
- SAT
1 stop21h 08m
Frontier
Deal found 6/14![Frontier logo]()
$126
This Delta deal was found by Cheapflights users on 6/9. 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.
Wed 8/512:46 pm
MDW
- SAT
1 stop6h 00m
Delta
Deal found 6/9![Delta logo]()
$126
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:40 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 6/11![Southwest logo]()
$126
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:50 pm
ORD
- SAT
1 stop7h 14m
Delta
Deal found 6/12![Delta logo]()
$127
This Frontier deal was found by Cheapflights users on 6/10. 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.
Thu 9/101:02 pm
ORD
- SAT
1 stop8h 37m
Frontier
Deal found 6/10![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 6/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:46 pm
STL
- SAT
1 stop8h 53m
Frontier
Deal found 6/11![Frontier logo]()
$129
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 June 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $263 (Frontier) |
One-way from | $111 (Booking.com) |
Popular in | April |
Cheapest in | October |
Average price | $367 |
Good round-trip deal | $336 or less |
Good one-way deal | $183 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 June 14, 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
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Tue 6/30
11:09 am-6:37 pm
1 stop7h 28m
San Antonio
Sat 8/8
5:59 am-11:13 am
1 stop5h 14m
$293
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Sat 10/10
11:00 am-5:18 pm
1 stop6h 18m
San Antonio
Wed 10/14
4:25 pm-10:30 pm
1 stop6h 05m
$293
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Wed 7/1
3:47 pm-10:57 pm
1 stop7h 10m
San Antonio
Sat 8/8
5:30 am-1:56 pm
2 stops8h 26m
$298
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Fri 10/9
5:00 pm-12:28 am
1 stop7h 28m
San Antonio
Wed 10/14
10:45 am-4:22 pm
1 stop5h 37m
$306
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Wed 7/8
5:05 pm-12:20 am
1 stop7h 15m
San Antonio
Wed 7/15
2:35 pm-10:31 pm
1 stop7h 56m
$306
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Wed 10/28
5:55 am-1:22 pm
1 stop7h 27m
San Antonio
Mon 11/2
2:10 pm-10:30 pm
1 stop8h 20m
$306
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Sat 10/10
6:32 am-3:53 pm
2 stops9h 21m
San Antonio
Sat 10/17
6:35 am-12:37 pm
1 stop6h 02m
$308
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Thu 8/20
4:24 pm-12:28 am
1 stop8h 04m
San Antonio
Sun 8/23
5:20 am-11:27 am
1 stop6h 07m
$309
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Fri 10/9
12:00 pm-8:22 pm
1 stop8h 22m
San Antonio
Mon 10/12
8:00 am-3:16 pm
1 stop7h 16m
$309
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Wed 7/8
9:00 pm-11:45 pm
Nonstop2h 45m
San Antonio
Wed 7/15
12:55 pm-6:30 pm
1 stop5h 35m
$315
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.
MDW-SAT
STL-SAT
ORD-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
MDW-SAT
STL-SAT
ORD-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 April is currently the most expensive (average of $198). 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 June 14, 2026.
It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 8% 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 June 14, 2026.
The most flights from USIL to SAT are scheduled on a Monday (27 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (21 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 13, 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 at noon 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
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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 June 14, 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 June 14, 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 June 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$230 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$218 | Average$360 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$356 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$235 | Average$437 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$241 | Average$408 | FlexibilityNo cancel fee | On-time71% |