$103+ Cheap flights from San Antonio (SAT) to Illinois
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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Aug 11 — Aug 181
Round-trip
1 adult, Economy
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Cheapest flights from San Antonio to IllinoisExplore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 12, 2026.
Explore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 12, 2026.
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:00 am
SAT
- STL
1 stop4h 24m
American Airlines
Tue 8/255:42 am
STL
- SAT
1 stop4h 19m
American Airlines
Deal found 7/8![American Airlines logo]()
$257
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.
Sat 8/84:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Mon 8/107:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 7/9![Frontier logo]()
$259
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/135:00 am
SAT
- STL
1 stop4h 24m
American Airlines
Mon 8/173:32 pm
STL
- SAT
1 stop5h 25m
American Airlines
Deal found 7/8![American Airlines logo]()
$260
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.
Sat 8/87:20 am
SAT
- STL
Nonstop2h 05m
Southwest
Wed 8/128:45 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/10![Southwest logo]()
$274
This Southwest deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/43:30 pm
SAT
- STL
Nonstop2h 10m
Southwest
Tue 8/118:40 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/7![Southwest logo]()
$276
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.
Fri 8/79:51 am
SAT
- ORD
1 stop13h 19m
Frontier
Fri 8/147:29 am
ORD
- SAT
1 stop13h 08m
Frontier
Deal found 7/10![Frontier logo]()
$279
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2310:24 pm
SAT
- ORD
1 stop20h 38m
Frontier
Sun 8/307:44 pm
ORD
- SAT
1 stop13h 12m
Frontier
Deal found 7/9![Frontier logo]()
$280
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 8/213:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Mon 8/245:55 am
MDW
- SAT
1 stop4h 30m
Southwest
Deal found 7/10![Southwest logo]()
$280
This Trip.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 7/287:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Sat 8/18:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 7/7![Frontier logo]()
$281
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/49:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Tue 8/116:19 am
ORD
- SAT
2 stops12h 35m
Frontier
Deal found 7/9![Frontier logo]()
$281
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 8/142:15 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Sat 8/1510:05 am
MDW
- SAT
2 stops5h 55m
Southwest
Deal found 7/9![Southwest logo]()
$281
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:26 pm
SAT
- ORD
1 stop17h 10m
Multiple Airlines
Tue 9/17:44 pm
ORD
- SAT
2 stops20h 29m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$282
Best flights from San Antonio to IllinoisDiscover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 12, 2026.
Discover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 12, 2026.
This Travelocity 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/119:57 am
SAT
- ORD
1 stop13h 58m
Frontier
Sun 9/1310:40 pm
ORD
- SAT
1 stop11h 32m
Frontier
Deal found 7/11![Frontier logo]()
$279
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:30 pm
SAT
- ORD
Nonstop3h 00m
United Airlines
Mon 8/247:50 pm
ORD
- SAT
Nonstop3h 00m
United Airlines
Deal found 7/11![United Airlines logo]()
$297
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2311:36 am
SAT
- MLI
2 stops10h 54m
Delta
Wed 9/305:16 pm
MLI
- SAT
1 stop6h 54m
Delta
Deal found 7/11![Delta logo]()
$298
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.
Wed 11/43:20 pm
SAT
- STL
Nonstop2h 05m
Southwest
Tue 11/106:35 am
STL
- SAT
1 stop7h 25m
Southwest
Deal found 7/12![Southwest logo]()
$302
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 8/84:40 pm
SAT
- MLI
1 stop5h 31m
American Airlines
Fri 8/146:00 am
MLI
- SAT
1 stop6h 53m
American Airlines
Deal found 7/9![American Airlines logo]()
$306
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:32 pm
SAT
- RFD
1 stop14h 52m
Multiple Airlines
Mon 8/37:50 pm
RFD
- SAT
2 stops24h 47m
Multiple Airlines
Deal found 7/9![Multiple Airlines logo]()
$467
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 8/85:40 am
SAT
- STL
1 stop3h 50m
Southwest
Mon 8/108:30 am
STL
- SAT
Nonstop2h 05m
Southwest
Deal found 7/9![Southwest logo]()
$305
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:20 am
SAT
- STL
1 stop6h 26m
Delta
Tue 8/253:39 pm
STL
- SAT
1 stop5h 25m
Delta
Deal found 7/11![Delta logo]()
$307
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.
Sun 8/97:28 am
SAT
- BMI
1 stop5h 32m
American Airlines
Sat 8/154:49 pm
BMI
- SAT
1 stop6h 05m
American Airlines
Deal found 7/11![American Airlines logo]()
$309
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.
Sat 8/85:30 am
SAT
- MLI
2 stops9h 35m
United Airlines
Fri 8/1410:30 am
MLI
- SAT
1 stop6h 01m
United Airlines
Deal found 7/9![United Airlines logo]()
$311
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.
Thu 9/311:50 am
SAT
- STL
1 stop6h 35m
Southwest
Tue 9/84:45 pm
STL
- SAT
1 stop6h 20m
Southwest
Deal found 7/11![Southwest logo]()
$307
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/52:45 pm
SAT
- MLI
2 stops9h 23m
American Airlines
Wed 8/124:32 pm
MLI
- SAT
1 stop4h 25m
American Airlines
Deal found 7/8![American Airlines logo]()
$311
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 11/54:29 pm
SAT
- MLI
1 stop6h 05m
Delta
Sun 11/85:10 pm
MLI
- SAT
1 stop7h 17m
Delta
Deal found 7/9![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:30 am
SAT
- PIA
2 stops9h 30m
United Airlines
Tue 9/84:35 pm
PIA
- SAT
1 stop6h 16m
United Airlines
Deal found 7/7![United Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 9/19:27 am
SAT
- PIA
1 stop6h 26m
American Airlines
Tue 9/86:48 pm
PIA
- SAT
1 stop6h 00m
American Airlines
Deal found 7/7![American Airlines logo]()
$319
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.
Fri 9/411:29 am
SAT
- MDW
1 stop7h 04m
Delta
Tue 9/89:29 am
MDW
- SAT
1 stop6h 26m
Delta
Deal found 7/9![Delta logo]()
$339
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:30 am
SAT
- STL
1 stop5h 32m
United Airlines
Wed 8/268:50 am
STL
- SAT
2 stops8h 53m
United Airlines
Deal found 7/8![United Airlines logo]()
$342
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.
Sun 8/235:20 pm
SAT
- MDW
1 stop7h 05m
Southwest
Sat 8/291:50 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 7/10![Southwest logo]()
$347
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.
Thu 8/205:27 pm
SAT
- STL
1 stop5h 32m
United Airlines
Tue 8/257:25 am
STL
- SAT
2 stops8h 18m
United Airlines
Deal found 7/10![United Airlines logo]()
$343
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/210:59 am
SAT
- MLI
2 stops7h 12m
American Airlines
Mon 9/76:45 pm
MLI
- SAT
1 stop6h 03m
American Airlines
Deal found 7/8![American Airlines logo]()
$351
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/87:55 pm
SAT
- MDW
1 stop5h 10m
Southwest
Sun 10/119:25 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 7/8![Southwest logo]()
$374
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.
Thu 12/36:43 am
SAT
- ORD
Nonstop2h 56m
United Airlines
Sun 12/67:45 am
ORD
- SAT
1 stop5h 18m
United Airlines
Deal found 7/10![United Airlines logo]()
$347
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:20 am
SAT
- MDW
1 stop6h 36m
Delta
Wed 8/55:10 pm
MDW
- SAT
1 stop7h 18m
Delta
Deal found 7/8![Delta logo]()
$394
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/76:40 am
SAT
- PIA
1 stop5h 58m
United Airlines
Thu 8/135:45 am
PIA
- SAT
2 stops9h 58m
United Airlines
Deal found 7/8![United Airlines logo]()
$352
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.
Wed 8/53:30 pm
SAT
- STL
Nonstop2h 10m
Southwest
Fri 8/148:45 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/12![Southwest logo]()
$389
This Delta deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 10/168:00 am
SAT
- ORD
1 stop6h 27m
Delta
Sat 10/242:00 pm
ORD
- SAT
1 stop8h 27m
Delta
Deal found 7/7![Delta logo]()
$407
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.
Fri 9/114:27 pm
SAT
- CMI
1 stop5h 19m
American Airlines
Sun 9/136:41 pm
CMI
- SAT
1 stop5h 14m
American Airlines
Deal found 7/9![American Airlines logo]()
$420
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.
Mon 10/127:40 am
SAT
- STL
Nonstop2h 05m
Southwest
Thu 10/158:30 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/9![Southwest logo]()
$391
This United Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/81:25 pm
SAT
- ORD
Nonstop3h 02m
United Airlines
Sat 8/151:30 pm
ORD
- SAT
Nonstop3h 01m
United Airlines
Deal found 7/7![United Airlines logo]()
$367
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/411:29 am
SAT
- ORD
1 stop7h 00m
Delta
Mon 9/76:00 am
ORD
- SAT
1 stop5h 49m
Delta
Deal found 7/8![Delta logo]()
$407
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated July 12, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated July 12, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 7/287:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Sat 8/18:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 7/7![Frontier logo]()
$281
This Southwest deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/43:30 pm
SAT
- STL
Nonstop2h 10m
Southwest
Tue 8/118:40 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/7![Southwest logo]()
$276
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/49:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Tue 8/116:19 am
ORD
- SAT
2 stops12h 35m
Frontier
Deal found 7/9![Frontier logo]()
$281
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.
Fri 8/79:51 am
SAT
- ORD
1 stop13h 19m
Frontier
Fri 8/147:29 am
ORD
- SAT
1 stop13h 08m
Frontier
Deal found 7/10![Frontier logo]()
$279
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.
Sat 8/84:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Mon 8/107:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 7/9![Frontier logo]()
$259
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.
Sat 8/87:20 am
SAT
- STL
Nonstop2h 05m
Southwest
Wed 8/128:45 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/10![Southwest logo]()
$274
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/135:00 am
SAT
- STL
1 stop4h 24m
American Airlines
Mon 8/173:32 pm
STL
- SAT
1 stop5h 25m
American Airlines
Deal found 7/8![American Airlines logo]()
$260
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 8/142:15 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Sat 8/1510:05 am
MDW
- SAT
2 stops5h 55m
Southwest
Deal found 7/9![Southwest logo]()
$281
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:26 pm
SAT
- ORD
1 stop17h 10m
Multiple Airlines
Tue 9/17:44 pm
ORD
- SAT
2 stops20h 29m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$282
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:00 am
SAT
- STL
1 stop4h 24m
American Airlines
Tue 8/255:42 am
STL
- SAT
1 stop4h 19m
American Airlines
Deal found 7/8![American Airlines logo]()
$257
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 8/213:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Mon 8/245:55 am
MDW
- SAT
1 stop4h 30m
Southwest
Deal found 7/10![Southwest logo]()
$280
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2310:24 pm
SAT
- ORD
1 stop20h 38m
Frontier
Sun 8/307:44 pm
ORD
- SAT
1 stop13h 12m
Frontier
Deal found 7/9![Frontier logo]()
$280
One-way flights from San Antonio to IllinoisSearch for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated July 12, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated July 12, 2026.
This Super.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/49:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/7![Frontier logo]()
$103
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/59:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/8![Frontier logo]()
$104
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/210:24 pm
SAT
- ORD
1 stop20h 38m
Frontier
Deal found 7/9![Frontier logo]()
$109
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 9/77:28 am
SAT
- ORD
Nonstop3h 07m
American Airlines
Deal found 7/9![American Airlines logo]()
$116
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 8/105:00 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/10![Southwest logo]()
$116
This American Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/85:59 am
SAT
- ORD
Nonstop3h 07m
American Airlines
Deal found 7/7![American Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/182:50 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 7/7![Southwest logo]()
$117
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:26 pm
SAT
- ORD
1 stop13h 35m
Frontier
Deal found 7/9![Frontier logo]()
$121
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/109:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/10![Frontier logo]()
$122
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.
Sat 8/89:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/8![Frontier logo]()
$124
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/611:25 am
SAT
- STL
1 stop3h 45m
Southwest
Deal found 7/8![Southwest logo]()
$125
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:38 pm
SAT
- STL
3 stops23h 44m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$126
Find flight deals from San Antonio to Illinois
Keep the following information in mind while searching for San Antonio to Illinois flight deals. Data was last updated July 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $257 (American Airlines) |
One-way from | $103 (Super.com) |
Popular in | June |
Cheapest in | September |
Average price | $387 |
Good round-trip deal | $332 or less |
Good one-way deal | $252 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from San Antonio to Illinois 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 12, 2026.
Use the filters below to find and compare flights from San Antonio to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Fri 9/11
9:57 am-11:55 pm
1 stop13h 58m
Chicago O'Hare Intl
Sun 9/13
10:40 pm-10:12 am
1 stop11h 32m
$279
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Sat 8/22
5:30 pm-8:30 pm
Nonstop3h 00m
Chicago O'Hare Intl
Mon 8/24
7:50 pm-10:50 pm
Nonstop3h 00m
$297
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Wed 9/23
11:36 am-10:30 pm
2 stops10h 54m
Moline Quad-City
Wed 9/30
5:16 pm-12:10 am
1 stop6h 54m
$298
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Wed 11/4
3:20 pm-5:25 pm
Nonstop2h 05m
Lambert-St Louis
Tue 11/10
6:35 am-2:00 pm
1 stop7h 25m
$302
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Sat 8/8
5:40 am-9:30 am
1 stop3h 50m
Lambert-St Louis
Mon 8/10
8:30 am-10:35 am
Nonstop2h 05m
$305
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Sat 8/8
4:40 pm-10:11 pm
1 stop5h 31m
Moline Quad-City
Fri 8/14
6:00 am-12:53 pm
1 stop6h 53m
$306
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 8/20
5:20 am-11:46 am
1 stop6h 26m
Lambert-St Louis
Tue 8/25
3:39 pm-9:04 pm
1 stop5h 25m
$307
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 9/3
11:50 am-6:25 pm
1 stop6h 35m
Lambert-St Louis
Tue 9/8
4:45 pm-11:05 pm
1 stop6h 20m
$307
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Sun 8/9
7:28 am-1:00 pm
1 stop5h 32m
Bloomington-Normal
Sat 8/15
4:49 pm-10:54 pm
1 stop6h 05m
$309
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Sat 8/8
5:30 am-3:05 pm
2 stops9h 35m
Moline Quad-City
Fri 8/14
10:30 am-4:31 pm
1 stop6h 01m
$311
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Antonio to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Antonio with our price prediction graph.
SAT-ORD
SAT-MDW
SAT-STL
SAT-MLI
SAT-RFD
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 San Antonio to Illinois
SAT-USIL
SAT-ORD
SAT-MDW
SAT-STL
SAT-MLI
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $96). Flying from San Antonio to Illinois in June is currently the most expensive (average of $231). 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 SAT to IL?
Find hourly flight availability from San Antonio to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 12, 2026.
It’s optimal to fly from San Antonio to Illinois in the evening. By choosing this option you can save up to 34% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from San Antonio to Illinois
Explore weekly flight availability from San Antonio to Illinois. 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 12, 2026.
The most flights from SAT to USIL are scheduled on a Sunday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 on average).
How much does it cost to fly round-trip from San Antonio to Illinois?
How far ahead should I book a flight from San Antonio to Illinois?
Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Antonio to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated July 12, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest,Delta, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.6
Overall
7.9
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Overall
7.9
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Overall
7.9
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Overall
7.9
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Overall
7.9
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Overall
7.9
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from San Antonio to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Complete your trip
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San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on July 12, 2026.
Popular flight searches
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San Antonio to Illinois flights
Consider these flights traveling from San Antonio to Illinois.
Top 5 airlines flying from San Antonio to Illinois
Discover the top 5 airlines that operate flights from San Antonio to Illinois. 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 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$221 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$235 | Average$441 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$420 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$287 | Average$445 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$323 | FlexibilityNo cancel fee | On-timeN/A |