$100+ 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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Jun 13 — Jun 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 May 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 May 14, 2026.
This Trip.com deal was found by Cheapflights users on 5/10. 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.
Tue 6/238:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Tue 6/308:56 pm
SAT
- STL
1 stop21h 55m
Frontier
Deal found 5/10![Frontier logo]()
$199
This CheapOair deal was found by Cheapflights users on 5/11. 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.
Wed 6/107:03 pm
STL
- SAT
1 stop25h 08m
Frontier
Wed 6/177:51 pm
SAT
- STL
1 stop23h 02m
Frontier
Deal found 5/11![Frontier logo]()
$200
This Trip.com deal was found by Cheapflights users on 5/11. 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.
Sun 6/144:17 pm
STL
- SAT
1 stop23h 20m
Frontier
Wed 6/177:51 pm
SAT
- STL
1 stop23h 02m
Frontier
Deal found 5/11![Frontier logo]()
$218
This Frontier deal was found by Cheapflights users on 5/13. 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 6/49:06 pm
STL
- SAT
1 stop23h 08m
Frontier
Mon 6/87:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/13![Frontier logo]()
$219
This CheapOair deal was found by Cheapflights users on 5/11. 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 7/148:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Tue 7/218:59 pm
SAT
- STL
1 stop21h 06m
Frontier
Deal found 5/11![Frontier logo]()
$220
This Trip.com deal was found by Cheapflights users on 5/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/278:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Wed 6/38:59 pm
SAT
- STL
1 stop23h 12m
Frontier
Deal found 5/9![Frontier logo]()
$227
This CheapOair deal was found by Cheapflights users on 5/12. 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 8/74:09 pm
STL
- SAT
1 stop23h 32m
Frontier
Mon 8/104:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Deal found 5/12![Frontier logo]()
$234
This Trip.com deal was found by Cheapflights users on 5/11. 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.
Mon 6/227:38 pm
STL
- SAT
1 stop23h 18m
Frontier
Fri 6/268:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Deal found 5/11![Frontier logo]()
$238
This CheapOair deal was found by Cheapflights users on 5/12. 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 7/102:52 pm
STL
- SAT
1 stop29h 22m
Frontier
Mon 7/138:59 pm
SAT
- STL
1 stop21h 06m
Frontier
Deal found 5/12![Frontier logo]()
$240
This Trip.com deal was found by Cheapflights users on 5/10. 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.
Tue 5/268:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Tue 6/28:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Deal found 5/10![Frontier logo]()
$247
This Delta deal was found by Cheapflights users on 5/13. 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.
Wed 7/15:17 pm
MLI
- SAT
1 stop7h 16m
Delta
Wed 7/85:00 pm
SAT
- MLI
1 stop5h 31m
Delta
Deal found 5/13![Delta logo]()
$263
This American Airlines deal was found by Cheapflights users on 5/11. 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 6/106:43 pm
CMI
- SAT
1 stop5h 16m
American Airlines
Tue 6/166:05 am
SAT
- CMI
1 stop4h 58m
American Airlines
Deal found 5/11![American Airlines logo]()
$270
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 May 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 May 14, 2026.
This Delta deal was found by Cheapflights users on 5/13. 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.
Wed 7/15:17 pm
MLI
- SAT
1 stop7h 16m
Delta
Wed 7/85:00 pm
SAT
- MLI
1 stop5h 31m
Delta
Deal found 5/13![Delta logo]()
$263
This American Airlines deal was found by Cheapflights users on 5/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:43 pm
CMI
- SAT
1 stop5h 16m
American Airlines
Tue 6/162:10 pm
SAT
- CMI
1 stop6h 49m
American Airlines
Deal found 5/14![American Airlines logo]()
$306
This Southwest deal was found by Cheapflights users on 5/10. 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 9/293:15 pm
MDW
- SAT
1 stop6h 40m
Southwest
Wed 9/309:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 5/10![Southwest logo]()
$315
This United Airlines deal was found by Cheapflights users on 5/9. 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 6/21:30 pm
ORD
- SAT
Nonstop3h 00m
United Airlines
Sat 6/65:30 am
SAT
- ORD
1 stop4h 50m
United Airlines
Deal found 5/9![United Airlines logo]()
$328
This Delta deal was found by Cheapflights users on 5/12. 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.
Tue 9/111:00 am
MLI
- SAT
1 stop6h 09m
Delta
Sun 9/62:10 pm
SAT
- MLI
1 stop8h 20m
Delta
Deal found 5/12![Delta logo]()
$294
This Southwest deal was found by Cheapflights users on 5/9. 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.
Tue 6/29:00 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Sat 6/62:15 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 5/9![Southwest logo]()
$318
This American Airlines deal was found by Cheapflights users on 5/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:20 pm
PIA
- SAT
1 stop5h 25m
American Airlines
Tue 10/63:56 pm
SAT
- PIA
1 stop8h 13m
American Airlines
Deal found 5/14![American Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 5/12. 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 8/214:24 pm
BMI
- SAT
1 stop8h 04m
Delta
Sat 8/296:23 am
SAT
- BMI
1 stop5h 04m
Delta
Deal found 5/12![Delta logo]()
$302
This United Airlines deal was found by Cheapflights users on 5/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:15 am
STL
- SAT
1 stop4h 33m
United Airlines
Sat 11/712:24 pm
SAT
- STL
1 stop4h 11m
United Airlines
Deal found 5/14![United Airlines logo]()
$334
This American Airlines deal was found by Cheapflights users on 5/13. 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.
Thu 6/46:00 am
PIA
- SAT
1 stop8h 05m
American Airlines
Mon 6/85:52 pm
SAT
- PIA
1 stop6h 06m
American Airlines
Deal found 5/13![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 5/11. 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 9/248:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Tue 9/298:05 am
SAT
- MDW
1 stop7h 15m
Southwest
Deal found 5/11![Southwest logo]()
$328
This Delta deal was found by Cheapflights users on 5/10. 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 8/286:00 am
BMI
- SAT
1 stop7h 18m
Delta
Sat 9/55:30 am
SAT
- BMI
1 stop5h 41m
Delta
Deal found 5/10![Delta logo]()
$302
This United Airlines deal was found by Cheapflights users on 5/9. 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 8/185:09 pm
MLI
- SAT
1 stop5h 42m
United Airlines
Sat 8/2212:55 pm
SAT
- MLI
1 stop6h 36m
United Airlines
Deal found 5/9![United Airlines logo]()
$343
This American Airlines deal was found by Cheapflights users on 5/12. 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 5/294:22 pm
BMI
- SAT
1 stop5h 38m
American Airlines
Sun 5/316:27 pm
SAT
- BMI
1 stop5h 32m
American Airlines
Deal found 5/12![American Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 5/14. 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 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 40m
Southwest
Sat 7/2511:40 am
SAT
- MDW
1 stop6h 35m
Southwest
Deal found 5/14![Southwest logo]()
$346
This Delta deal was found by Cheapflights users on 5/12. 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.
Tue 6/29:22 am
MDW
- SAT
1 stop6h 30m
Delta
Tue 6/166:40 am
SAT
- MDW
1 stop5h 25m
Delta
Deal found 5/12![Delta logo]()
$325
This United Airlines deal was found by Cheapflights users on 5/9. 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 6/199:10 am
ORD
- SAT
Nonstop3h 02m
United Airlines
Tue 6/234:35 pm
SAT
- ORD
1 stop6h 14m
United Airlines
Deal found 5/9![United Airlines logo]()
$366
This United Airlines deal was found by Cheapflights users on 5/12. 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.
Mon 7/137:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Sat 7/181:20 pm
SAT
- ORD
Nonstop3h 02m
United Airlines
Deal found 5/12![United Airlines logo]()
$367
This American Airlines deal was found by Cheapflights users on 5/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/16:00 pm
BMI
- SAT
1 stop5h 59m
American Airlines
Thu 8/65:30 pm
SAT
- BMI
1 stop5h 20m
American Airlines
Deal found 5/14![American Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 5/9. 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 7/66:30 am
ORD
- SAT
1 stop5h 16m
Delta
Tue 7/215:15 am
SAT
- ORD
1 stop5h 22m
Delta
Deal found 5/9![Delta logo]()
$338
This Southwest deal was found by Cheapflights users on 5/10. 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 6/238:25 am
STL
- SAT
Nonstop2h 10m
Southwest
Tue 6/307:15 am
SAT
- STL
1 stop4h 50m
Southwest
Deal found 5/10![Southwest logo]()
$386
This United Airlines deal was found by Cheapflights users on 5/13. 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.
Sat 8/19:10 am
ORD
- SAT
Nonstop3h 04m
United Airlines
Thu 8/65:32 pm
SAT
- ORD
Nonstop3h 01m
United Airlines
Deal found 5/13![United Airlines logo]()
$367
This American Airlines deal was found by Cheapflights users on 5/10. 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 8/281:41 pm
BMI
- SAT
2 stops8h 19m
American Airlines
Sat 9/54:40 pm
SAT
- BMI
1 stop6h 10m
American Airlines
Deal found 5/10![American Airlines logo]()
$382
This Delta deal was found by Cheapflights users on 5/9. 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 6/35:17 pm
MLI
- SAT
1 stop7h 27m
Delta
Sat 6/62:27 pm
SAT
- MLI
1 stop7h 54m
Delta
Deal found 5/9![Delta logo]()
$349
This Southwest deal was found by Cheapflights users on 5/11. 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 6/239:20 pm
STL
- SAT
Nonstop2h 05m
Southwest
Sat 6/276:20 pm
SAT
- STL
1 stop5h 25m
Southwest
Deal found 5/11![Southwest logo]()
$386
This United Airlines deal was found by Cheapflights users on 5/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/248:00 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Wed 5/276:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Deal found 5/11![United Airlines logo]()
$367
This Delta deal was found by Cheapflights users on 5/9. 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 6/82:07 pm
ORD
- SAT
1 stop8h 14m
Delta
Mon 6/155:15 am
SAT
- ORD
1 stop5h 35m
Delta
Deal found 5/9![Delta logo]()
$351
This American Airlines deal was found by Cheapflights users on 5/12. 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 8/211:41 pm
BMI
- SAT
2 stops7h 31m
American Airlines
Sat 8/297:00 am
SAT
- BMI
2 stops10h 02m
American Airlines
Deal found 5/12![American Airlines logo]()
$387
This United Airlines deal was found by Cheapflights users on 5/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2910:45 am
PIA
- SAT
1 stop5h 18m
United Airlines
Tue 6/25:30 pm
SAT
- PIA
1 stop5h 50m
United Airlines
Deal found 5/14![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 5/12. 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 8/1110:15 am
STL
- SAT
2 stops6h 35m
Southwest
Thu 8/132:05 pm
SAT
- STL
2 stops7h 35m
Southwest
Deal found 5/12![Southwest logo]()
$427
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated May 14, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated May 14, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 5/10. 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.
Tue 5/268:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Tue 6/28:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Deal found 5/10![Frontier logo]()
$247
This CheapOair deal was found by Cheapflights users on 5/12. 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 5/278:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Wed 6/37:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/12![Frontier logo]()
$230
This CheapOair deal was found by Cheapflights users on 5/12. 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 6/36:51 pm
STL
- SAT
1 stop25h 23m
Frontier
Mon 6/87:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/12![Frontier logo]()
$234
This CheapOair deal was found by Cheapflights users on 5/12. 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 6/38:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Sun 6/77:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/12![Frontier logo]()
$240
This Frontier deal was found by Cheapflights users on 5/13. 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 6/49:06 pm
STL
- SAT
1 stop23h 08m
Frontier
Mon 6/87:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/13![Frontier logo]()
$219
This CheapOair deal was found by Cheapflights users on 5/11. 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.
Wed 6/107:03 pm
STL
- SAT
1 stop25h 08m
Frontier
Wed 6/177:51 pm
SAT
- STL
1 stop23h 02m
Frontier
Deal found 5/11![Frontier logo]()
$200
This American Airlines deal was found by Cheapflights users on 5/11. 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 6/106:43 pm
CMI
- SAT
1 stop5h 16m
American Airlines
Tue 6/166:05 am
SAT
- CMI
1 stop4h 58m
American Airlines
Deal found 5/11![American Airlines logo]()
$270
This Booking.com deal was found by Cheapflights users on 5/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/114:17 pm
STL
- SAT
1 stop23h 20m
Frontier
Wed 6/178:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Deal found 5/14![Frontier logo]()
$235
This Trip.com deal was found by Cheapflights users on 5/11. 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.
Sun 6/144:17 pm
STL
- SAT
1 stop23h 20m
Frontier
Wed 6/177:51 pm
SAT
- STL
1 stop23h 02m
Frontier
Deal found 5/11![Frontier logo]()
$218
This Trip.com deal was found by Cheapflights users on 5/11. 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.
Mon 6/227:38 pm
STL
- SAT
1 stop23h 18m
Frontier
Fri 6/268:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Deal found 5/11![Frontier logo]()
$238
This Trip.com deal was found by Cheapflights users on 5/10. 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.
Tue 6/238:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Tue 6/308:56 pm
SAT
- STL
1 stop21h 55m
Frontier
Deal found 5/10![Frontier logo]()
$199
This CheapOair deal was found by Cheapflights users on 5/10. 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.
Tue 6/238:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Fri 6/268:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Deal found 5/10![Frontier logo]()
$220
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 May 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 May 14, 2026.
This Super.com deal was found by Cheapflights users on 5/14. 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.
Tue 6/99:48 pm
ORD
- SAT
1 stop21h 08m
Frontier
Deal found 5/14![Frontier logo]()
$100
This Expedia deal was found by Cheapflights users on 5/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:15 am
ORD
- SAT
1 stop12h 59m
Frontier
Deal found 5/13![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 5/13. 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.
Fri 11/61:02 pm
ORD
- SAT
1 stop7h 54m
Frontier
Deal found 5/13![Frontier logo]()
$105
This CheapOair deal was found by Cheapflights users on 5/10. 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.
Wed 8/57:03 pm
STL
- SAT
1 stop25h 11m
Frontier
Deal found 5/10![Frontier logo]()
$106
This Super.com deal was found by Cheapflights users on 5/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/167:20 am
ORD
- SAT
1 stop12h 51m
Frontier
Deal found 5/11![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 5/13. 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 7/117:15 am
ORD
- SAT
1 stop12h 59m
Frontier
Deal found 5/13![Frontier logo]()
$111
This Trip.com deal was found by Cheapflights users on 5/11. 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.
Thu 6/49:06 pm
STL
- SAT
1 stop23h 08m
Frontier
Deal found 5/11![Frontier logo]()
$113
This Frontier deal was found by Cheapflights users on 5/10. 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.
Sat 8/87:15 am
ORD
- SAT
1 stop12h 59m
Frontier
Deal found 5/10![Frontier logo]()
$115
This Mytrip deal was found by Cheapflights users on 5/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/18:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Deal found 5/11![Frontier logo]()
$119
This Mytrip deal was found by Cheapflights users on 5/10. 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.
Mon 8/249:48 pm
ORD
- SAT
1 stop21h 08m
Frontier
Deal found 5/10![Frontier logo]()
$120
This Trip.com deal was found by Cheapflights users on 5/11. 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.
Mon 6/152:56 pm
STL
- SAT
1 stop29h 15m
Frontier
Deal found 5/11![Frontier logo]()
$120
This CheapOair deal was found by Cheapflights users on 5/12. 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 5/279:37 pm
ORD
- SAT
1 stop21h 22m
Frontier
Deal found 5/12![Frontier logo]()
$121
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 May 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $199 (Trip.com) |
One-way from | $100 (Super.com) |
Popular in | April |
Cheapest in | October |
Average price | $387 |
Good round-trip deal | $327 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 May 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
Wed 7/1
5:17 pm-12:33 am
1 stop7h 16m
San Antonio
Wed 7/8
5:00 pm-10:31 pm
1 stop5h 31m
$263
MolineSan Antonio
MLI - SAT
MLISAT
Moline Quad-City
Tue 9/1
11:00 am-5:09 pm
1 stop6h 09m
San Antonio
Sun 9/6
2:10 pm-10:30 pm
1 stop8h 20m
$294
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Fri 8/21
4:24 pm-12:28 am
1 stop8h 04m
San Antonio
Sat 8/29
6:23 am-11:27 am
1 stop5h 04m
$302
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Fri 8/28
6:00 am-1:18 pm
1 stop7h 18m
San Antonio
Sat 9/5
5:30 am-11:11 am
1 stop5h 41m
$302
ChampaignSan Antonio
CMI - SAT
CMISAT
Champaign University-Willard
Wed 6/10
6:43 pm-11:59 pm
1 stop5h 16m
San Antonio
Tue 6/16
2:10 pm-8:59 pm
1 stop6h 49m
$306
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Tue 9/29
3:15 pm-9:55 pm
1 stop6h 40m
San Antonio
Wed 9/30
9:25 am-12:00 pm
Nonstop2h 35m
$315
Quickest round-trip
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Tue 6/2
9:00 pm-11:50 pm
Nonstop2h 50m
San Antonio
Sat 6/6
2:15 pm-4:50 pm
Nonstop2h 35m
$318
PeoriaSan Antonio
PIA - SAT
PIASAT
Greater Peoria
Sat 10/3
12:20 pm-5:45 pm
1 stop5h 25m
San Antonio
Tue 10/6
3:56 pm-12:09 am
1 stop8h 13m
$319
PeoriaSan Antonio
PIA - SAT
PIASAT
Greater Peoria
Thu 6/4
6:00 am-2:05 pm
1 stop8h 05m
San Antonio
Mon 6/8
5:52 pm-11:58 pm
1 stop6h 06m
$319
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Tue 6/2
9:22 am-3:52 pm
1 stop6h 30m
San Antonio
Tue 6/16
6:40 am-12:05 pm
1 stop5h 25m
$325
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.
STL-SAT
CMI-SAT
MLI-SAT
MDW-SAT
ORD-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
CMI-SAT
MLI-SAT
MDW-SAT
How far ahead should I book a flight from Illinois to San Antonio?
Booking 39 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 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 May 14, 2026.
It’s optimal to fly from Illinois to San Antonio in the afternoon. By choosing this option you can save up to 9% 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 May 9, 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.
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 May 14, 2026.
The most flights from USIL to SAT are scheduled on a Monday (24 on average). You will have fewer flight options on Saturday, 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?
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.
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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 May 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 May 14, 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 May 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$234 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$176 | Average$259 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$214 | Average$349 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$356 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$228 | Average$406 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$439 | FlexibilityNo cancel fee | On-time63% |