$124+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Aug 13 — Aug 201
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 July 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 July 14, 2026.
This CheapOair deal was found by Cheapflights users on 7/14. 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.
Sat 10/106:50 am
ORD
- SAT
1 stop14h 56m
Frontier
Thu 10/153:10 pm
SAT
- ORD
1 stop18h 51m
Frontier
Deal found 7/14![Frontier logo]()
$254
This Frontier deal was found by Cheapflights users on 7/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/49:10 pm
ORD
- SAT
1 stop11h 46m
Frontier
Mon 9/79:51 am
SAT
- ORD
1 stop13h 17m
Frontier
Deal found 7/14![Frontier logo]()
$255
This Delta deal was found by Cheapflights users on 7/10. 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.
Tue 10/277:10 am
STL
- SAT
1 stop5h 26m
Delta
Tue 10/276:22 pm
SAT
- STL
1 stop5h 26m
Delta
Deal found 7/10![Delta logo]()
$257
This CheapOair deal was found by Cheapflights users on 7/13. 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 8/135:13 pm
ORD
- SAT
1 stop15h 43m
Frontier
Mon 8/177:49 pm
SAT
- ORD
1 stop17h 47m
Frontier
Deal found 7/13![Frontier logo]()
$258
This American Airlines deal was found by Cheapflights users on 7/9. 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 9/268:30 am
STL
- SAT
1 stop4h 37m
American Airlines
Wed 9/306:48 pm
SAT
- STL
1 stop5h 39m
American Airlines
Deal found 7/9![American Airlines logo]()
$258
This American Airlines deal was found by Cheapflights users on 7/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/245:42 am
STL
- SAT
1 stop4h 19m
American Airlines
Thu 8/276:52 pm
SAT
- STL
1 stop5h 22m
American Airlines
Deal found 7/10![American Airlines logo]()
$259
This Super.com deal was found by Cheapflights users on 7/14. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1410:16 am
ORD
- SAT
1 stop29h 25m
Frontier
Mon 8/179:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/14![Frontier logo]()
$261
This CheapOair deal was found by Cheapflights users on 7/13. 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.
Mon 8/37:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Thu 8/69:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Deal found 7/13![Frontier logo]()
$264
This CheapOair deal was found by Cheapflights users on 7/13. 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 9/2310:40 pm
ORD
- SAT
1 stop20h 14m
Frontier
Sun 9/277:49 pm
SAT
- ORD
1 stop25h 46m
Frontier
Deal found 7/13![Frontier logo]()
$267
This Southwest deal was found by Cheapflights users on 7/10. 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 10/278:30 am
STL
- SAT
Nonstop2h 10m
Southwest
Fri 10/306:45 pm
SAT
- STL
1 stop5h 50m
Southwest
Deal found 7/10![Southwest logo]()
$267
This Frontier deal was found by Cheapflights users on 7/13. 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 9/37:44 pm
ORD
- SAT
1 stop13h 12m
Frontier
Mon 9/79:51 am
SAT
- ORD
1 stop13h 17m
Frontier
Deal found 7/13![Frontier logo]()
$268
This Frontier deal was found by Cheapflights users on 7/9. 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.
Thu 10/88:34 pm
STL
- SAT
1 stop13h 05m
Frontier
Mon 10/1212:43 pm
SAT
- STL
1 stop12h 34m
Frontier
Deal found 7/9![Frontier logo]()
$268
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 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 July 14, 2026.
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/74:48 pm
STL
- SAT
1 stop7h 07m
United Airlines
Thu 8/135:30 am
SAT
- STL
1 stop4h 40m
United Airlines
Deal found 7/9![United Airlines logo]()
$293
This Delta deal was found by Cheapflights users on 7/10. 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.
Tue 1/55:55 am
MLI
- SAT
1 stop7h 27m
Delta
Tue 1/1910:45 am
SAT
- MLI
1 stop5h 37m
Delta
Deal found 7/10![Delta logo]()
$293
This Southwest deal was found by Cheapflights users on 7/12. 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 9/88:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Tue 9/159:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/12![Southwest logo]()
$297
This American Airlines deal was found by Cheapflights users on 7/12. 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.
Fri 8/144:49 pm
BMI
- SAT
1 stop5h 11m
American Airlines
Sun 8/166:52 pm
SAT
- BMI
1 stop5h 07m
American Airlines
Deal found 7/12![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 7/10. 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.
Sat 10/311:32 pm
CMI
- SAT
2 stops9h 19m
United Airlines
Thu 11/56:43 am
SAT
- CMI
1 stop6h 07m
United Airlines
Deal found 7/10![United Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 7/13. 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.
Thu 8/68:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Mon 8/105:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/13![Southwest logo]()
$297
This Delta deal was found by Cheapflights users on 7/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/225:16 pm
MLI
- SAT
1 stop6h 54m
Delta
Tue 9/298:00 am
SAT
- MLI
1 stop8h 22m
Delta
Deal found 7/13![Delta logo]()
$306
This American Airlines deal was found by Cheapflights users on 7/13. 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 8/124:49 pm
BMI
- SAT
1 stop5h 11m
American Airlines
Tue 8/185:54 pm
SAT
- BMI
1 stop4h 59m
American Airlines
Deal found 7/13![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 7/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/41:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Tue 8/116:30 am
SAT
- ORD
Nonstop2h 59m
United Airlines
Deal found 7/13![United Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 7/11. 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.
Wed 8/2610:10 am
MDW
- SAT
Nonstop2h 40m
Southwest
Wed 9/29:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/11![Southwest logo]()
$297
This Delta deal was found by Cheapflights users on 7/12. 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 11/275:00 pm
MLI
- SAT
1 stop7h 28m
Delta
Wed 12/210:45 am
SAT
- MLI
1 stop5h 37m
Delta
Deal found 7/12![Delta logo]()
$306
This American Airlines deal was found by Cheapflights users on 7/10. 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 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 7/10![American Airlines logo]()
$314
This Southwest deal was found by Cheapflights users on 7/10. 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.
Mon 8/248:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Mon 8/315:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/10![Southwest logo]()
$301
This Delta deal was found by Cheapflights users on 7/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:05 am
STL
- SAT
1 stop6h 58m
Delta
Tue 9/294:21 pm
SAT
- STL
1 stop7h 21m
Delta
Deal found 7/13![Delta logo]()
$307
This United Airlines deal was found by Cheapflights users on 7/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/196:30 am
BMI
- SAT
1 stop5h 17m
United Airlines
Mon 11/236:43 am
SAT
- BMI
1 stop7h 07m
United Airlines
Deal found 7/13![United Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 7/9. 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 8/14:43 pm
PIA
- SAT
1 stop6h 21m
American Airlines
Sun 8/236:00 am
SAT
- PIA
1 stop5h 50m
American Airlines
Deal found 7/9![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 7/11. 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 10/241:50 pm
STL
- SAT
Nonstop2h 10m
Southwest
Tue 10/2711:25 am
SAT
- STL
1 stop3h 45m
Southwest
Deal found 7/11![Southwest logo]()
$303
This Delta deal was found by Cheapflights users on 7/10. 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 12/1011:51 am
STL
- SAT
1 stop5h 27m
Delta
Mon 12/146:15 pm
SAT
- STL
1 stop5h 24m
Delta
Deal found 7/10![Delta logo]()
$309
This Delta deal was found by Cheapflights users on 7/10. 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 7/10![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 7/13. 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 9/212:45 pm
STL
- SAT
1 stop4h 05m
Southwest
Sun 9/62:45 pm
SAT
- STL
Nonstop2h 10m
Southwest
Deal found 7/13![Southwest logo]()
$314
This United Airlines deal was found by Cheapflights users on 7/10. 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.
Mon 8/107:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Sun 8/165:30 am
SAT
- ORD
1 stop5h 50m
United Airlines
Deal found 7/10![United Airlines logo]()
$347
This American Airlines deal was found by Cheapflights users on 7/11. 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.
Sat 10/36:00 am
PIA
- SAT
2 stops9h 37m
American Airlines
Tue 10/64:28 pm
SAT
- PIA
2 stops7h 42m
American Airlines
Deal found 7/11![American Airlines logo]()
$366
This Delta deal was found by Cheapflights users on 7/9. 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 11/194:00 pm
BMI
- SAT
1 stop8h 28m
Delta
Mon 11/234:25 pm
SAT
- BMI
1 stop5h 58m
Delta
Deal found 7/9![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 7/9. 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.
Sat 8/151:50 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Sun 8/167:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/9![Southwest logo]()
$337
This United Airlines deal was found by Cheapflights users on 7/10. 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 8/266:03 am
ORD
- SAT
2 stops13h 55m
United Airlines
Fri 8/285:59 pm
SAT
- ORD
1 stop5h 27m
United Airlines
Deal found 7/10![United Airlines logo]()
$380
This Delta deal was found by Cheapflights users on 7/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/45:20 pm
ORD
- SAT
1 stop5h 14m
Delta
Tue 8/115:15 am
SAT
- ORD
1 stop7h 53m
Delta
Deal found 7/13![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 7/9. 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.
Fri 10/165:05 am
STL
- SAT
1 stop5h 55m
Southwest
Mon 10/197:40 am
SAT
- STL
Nonstop2h 05m
Southwest
Deal found 7/9![Southwest logo]()
$348
This Delta deal was found by Cheapflights users on 7/12. 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.
Sat 10/1011:35 am
MDW
- SAT
1 stop5h 40m
Delta
Thu 10/156:45 am
SAT
- MDW
1 stop5h 20m
Delta
Deal found 7/12![Delta logo]()
$317
This United Airlines deal was found by Cheapflights users on 7/12. 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.
Tue 8/111:30 pm
ORD
- SAT
Nonstop3h 01m
United Airlines
Tue 8/185:27 pm
SAT
- ORD
Nonstop3h 00m
United Airlines
Deal found 7/12![United Airlines logo]()
$387
This American Airlines deal was found by Cheapflights users on 7/10. 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 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 7/10![American Airlines logo]()
$437
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated July 14, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated July 14, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/317:15 am
ORD
- SAT
1 stop13h 22m
Frontier
Mon 8/39:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/8![Frontier logo]()
$269
This CheapOair deal was found by Cheapflights users on 7/10. 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.
Sat 8/18:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Thu 8/69:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Deal found 7/10![Frontier logo]()
$273
This Trip.com deal was found by Cheapflights users on 7/13. 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.
Sat 8/19:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Wed 8/59:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/13![Frontier logo]()
$274
This CheapOair deal was found by Cheapflights users on 7/13. 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.
Mon 8/37:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Thu 8/69:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Deal found 7/13![Frontier logo]()
$264
This CheapOair deal was found by Cheapflights users on 7/11. 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.
Tue 8/49:57 pm
ORD
- SAT
1 stop20h 57m
Frontier
Tue 8/119:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/11![Frontier logo]()
$270
This Southwest deal was found by Cheapflights users on 7/10. 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 8/48:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Tue 8/111:30 pm
SAT
- MDW
1 stop7h 10m
Southwest
Deal found 7/10![Southwest logo]()
$274
This CheapOair deal was found by Cheapflights users on 7/12. 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.
Wed 8/58:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Sat 8/84:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Deal found 7/12![Frontier logo]()
$268
This Southwest deal was found by Cheapflights users on 7/10. 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 8/78:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Mon 8/103:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Deal found 7/10![Southwest logo]()
$271
This American Airlines deal was found by Cheapflights users on 7/9. 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.
Mon 8/104:54 pm
STL
- SAT
1 stop7h 54m
American Airlines
Tue 8/112:45 pm
SAT
- STL
1 stop5h 41m
American Airlines
Deal found 7/9![American Airlines logo]()
$258
This CheapOair deal was found by Cheapflights users on 7/13. 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 8/135:13 pm
ORD
- SAT
1 stop15h 43m
Frontier
Mon 8/177:49 pm
SAT
- ORD
1 stop17h 47m
Frontier
Deal found 7/13![Frontier logo]()
$258
This American Airlines deal was found by Cheapflights users on 7/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/245:42 am
STL
- SAT
1 stop4h 19m
American Airlines
Thu 8/276:52 pm
SAT
- STL
1 stop5h 22m
American Airlines
Deal found 7/10![American Airlines logo]()
$259
This Kiwi.com deal was found by Cheapflights users on 7/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:41 pm
ORD
- SAT
1 stop28h 50m
Frontier
Wed 9/28:26 pm
SAT
- ORD
1 stop17h 10m
Frontier
Deal found 7/12![Frontier logo]()
$272
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 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 July 14, 2026.
This United Airlines deal was found by Cheapflights users on 7/10. 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 11/176:15 am
STL
- SAT
1 stop4h 45m
United Airlines
Deal found 7/10![United Airlines logo]()
$124
This Southwest deal was found by Cheapflights users on 7/9. 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 9/98:40 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/9![Southwest logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 7/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:10 pm
STL
- SAT
1 stop14h 02m
Frontier
Deal found 7/12![Frontier logo]()
$128
This Delta deal was found by Cheapflights users on 7/9. 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 9/95:46 pm
STL
- SAT
1 stop6h 24m
Delta
Deal found 7/9![Delta logo]()
$129
This Frontier deal was found by Cheapflights users on 7/13. 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.
Sat 8/157:29 am
ORD
- SAT
1 stop13h 08m
Frontier
Deal found 7/13![Frontier logo]()
$130
This American Airlines deal was found by Cheapflights users on 7/9. 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.
Thu 8/205:42 am
STL
- SAT
1 stop4h 19m
American Airlines
Deal found 7/9![American Airlines logo]()
$130
This CheapOair deal was found by Cheapflights users on 7/14. 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.
Wed 8/127:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 7/14![Frontier logo]()
$131
This Super.com deal was found by Cheapflights users on 7/13. 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.
Mon 8/109:57 pm
ORD
- SAT
1 stop20h 57m
Frontier
Deal found 7/13![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 7/10. 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.
Sun 9/1311:06 am
ORD
- SAT
1 stop7h 48m
Frontier
Deal found 7/10![Frontier logo]()
$135
This Super.com deal was found by Cheapflights users on 7/12. 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 7/289:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 7/12![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 7/11. 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.
Wed 8/124:57 pm
STL
- SAT
3 stops41h 53m
Multiple Airlines
Deal found 7/11![Multiple Airlines logo]()
$139
This CheapOair deal was found by Cheapflights users on 7/11. 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 8/207:58 pm
STL
- SAT
1 stop23h 33m
Frontier
Deal found 7/11![Frontier logo]()
$140
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 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $254 (CheapOair) |
One-way from | $124 (United Airlines) |
Popular in | April |
Cheapest in | October |
Average price | $411 |
Good round-trip deal | $319 or less |
Good one-way deal | $145 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 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
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Fri 8/7
4:48 pm-11:55 pm
1 stop7h 07m
San Antonio
Thu 8/13
5:30 am-10:10 am
1 stop4h 40m
$293
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Tue 1/5
5:55 am-1:22 pm
1 stop7h 27m
San Antonio
Tue 1/19
10:45 am-4:22 pm
1 stop5h 37m
$293
ChampaignSan Antonio
CMI - SAT
CMISAT
Champaign University-Willard
Sat 10/31
1:32 pm-10:51 pm
2 stops9h 19m
San Antonio
Thu 11/5
6:43 am-12:50 pm
1 stop6h 07m
$295
Quickest round-trip
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Tue 9/8
8:30 pm-11:10 pm
Nonstop2h 40m
San Antonio
Tue 9/15
9:25 am-12:00 pm
Nonstop2h 35m
$297
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
$297
ChicagoSan Antonio
ORD - SAT
ORDSAT
Chicago O'Hare Intl
Tue 8/4
1:30 pm-4:29 pm
Nonstop2h 59m
San Antonio
Tue 8/11
6:30 am-9:29 am
Nonstop2h 59m
$297
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Wed 8/26
10:10 am-12:50 pm
Nonstop2h 40m
San Antonio
Wed 9/2
9:25 am-12:00 pm
Nonstop2h 35m
$297
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Mon 8/24
8:35 pm-11:15 pm
Nonstop2h 40m
San Antonio
Mon 8/31
5:00 am-7:35 am
Nonstop2h 35m
$301
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Sat 10/24
1:50 pm-4:00 pm
Nonstop2h 10m
San Antonio
Tue 10/27
11:25 am-3:10 pm
1 stop3h 45m
$303
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Tue 9/22
5:16 pm-12:10 am
1 stop6h 54m
San Antonio
Tue 9/29
8:00 am-4:22 pm
1 stop8h 22m
$306
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
STL-SAT
MDW-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
STL-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 $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 14, 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 14, 2026.
The most flights from USIL to SAT are scheduled on a Sunday (31 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 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 48 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 July 11, 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 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 July 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 July 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$226 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$219 | Average$362 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$361 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$235 | Average$437 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$244 | Average$400 | FlexibilityNo cancel fee | On-time71% |