$108+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jun 30 — Jul 71
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 May 31, 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 May 31, 2026.
This American Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 8/208:00 am
SAT
- STL
1 stop6h 45m
American Airlines
Tue 8/255:42 am
STL
- SAT
1 stop4h 27m
American Airlines
Deal found 5/30![American Airlines logo]()
$259
This United Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 8/146:36 am
SAT
- STL
1 stop5h 26m
United Airlines
Mon 8/175:30 pm
STL
- SAT
1 stop5h 21m
United Airlines
Deal found 5/30![United Airlines logo]()
$261
This CheapOair deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/237:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Sat 7/118:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 5/30![Frontier logo]()
$268
This Booking.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Sat 7/258:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Deal found 5/27![Frontier logo]()
$270
This American Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/276:05 am
SAT
- CMI
1 stop5h 00m
American Airlines
Sat 7/46:34 pm
CMI
- SAT
1 stop5h 25m
American Airlines
Deal found 5/27![American Airlines logo]()
$270
This CheapOair deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/228:56 pm
SAT
- STL
1 stop21h 55m
Frontier
Wed 6/247:46 pm
STL
- SAT
1 stop24h 25m
Frontier
Deal found 5/30![Frontier logo]()
$273
This Booking.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/258:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Tue 6/308:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/27![Frontier logo]()
$275
This CheapOair deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/228:56 pm
SAT
- STL
1 stop21h 55m
Frontier
Thu 6/252:56 pm
STL
- SAT
1 stop29h 15m
Frontier
Deal found 5/30![Frontier logo]()
$278
This Booking.com deal was found by Cheapflights users on 5/28. Clicking the “Pick Dates” 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 6/258:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Thu 7/212:11 pm
STL
- SAT
1 stop8h 00m
Frontier
Deal found 5/28![Frontier logo]()
$280
This American Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/246:01 am
SAT
- MLI
1 stop4h 38m
American Airlines
Wed 7/156:50 pm
MLI
- SAT
1 stop5h 20m
American Airlines
Deal found 5/27![American Airlines logo]()
$291
This CheapOair deal was found by Cheapflights users on 5/31. Clicking the “Pick Dates” 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 7/89:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Wed 7/157:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 5/31![Frontier logo]()
$294
This CheapOair deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 10/153:10 pm
SAT
- STL
1 stop28h 05m
Frontier
Mon 10/198:10 pm
STL
- SAT
1 stop15h 11m
Frontier
Deal found 5/30![Frontier logo]()
$303
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 May 31, 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 May 31, 2026.
This American Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/276:05 am
SAT
- CMI
1 stop5h 00m
American Airlines
Sat 7/46:34 pm
CMI
- SAT
1 stop5h 25m
American Airlines
Deal found 5/27![American Airlines logo]()
$270
This United Airlines deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:32 pm
SAT
- ORD
Nonstop3h 01m
United Airlines
Tue 7/281:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/29![United Airlines logo]()
$305
This Southwest deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 10/222:20 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Mon 10/269:55 am
MDW
- SAT
2 stops6h 20m
Southwest
Deal found 5/27![Southwest logo]()
$328
This Delta deal was found by Cheapflights users on 5/31. Clicking the “Pick Dates” 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 9/176:45 am
SAT
- MDW
1 stop5h 10m
Delta
Mon 9/211:00 pm
MDW
- SAT
1 stop5h 38m
Delta
Deal found 5/31![Delta logo]()
$355
This Kiwi.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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 stops23h 04m
Multiple Airlines
Deal found 5/26![Multiple Airlines logo]()
$478
This United Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:20 pm
SAT
- ORD
1 stop5h 25m
United Airlines
Wed 7/159:25 am
ORD
- SAT
Nonstop3h 04m
United Airlines
Deal found 5/26![United Airlines logo]()
$307
This American Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/256:24 pm
SAT
- BMI
1 stop6h 11m
American Airlines
Thu 7/24:30 pm
BMI
- SAT
1 stop6h 34m
American Airlines
Deal found 5/30![American Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 8/2911:10 am
SAT
- MDW
Nonstop2h 35m
Southwest
Sat 9/51:50 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/30![Southwest logo]()
$335
This American Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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 7/106:57 pm
SAT
- PIA
1 stop5h 25m
American Airlines
Sat 7/114:43 pm
PIA
- SAT
1 stop5h 17m
American Airlines
Deal found 5/26![American Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 9/35:45 pm
SAT
- ORD
1 stop6h 17m
Delta
Tue 9/83:50 pm
ORD
- SAT
1 stop5h 38m
Delta
Deal found 5/30![Delta logo]()
$356
This United Airlines deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” 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 8/16:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Tue 8/47:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/29![United Airlines logo]()
$336
This Southwest deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” 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 8/111:40 am
SAT
- MDW
2 stops5h 15m
Southwest
Tue 8/48:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/29![Southwest logo]()
$347
This American Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:57 pm
SAT
- PIA
1 stop5h 25m
American Airlines
Tue 7/146:58 pm
PIA
- SAT
1 stop5h 12m
American Airlines
Deal found 5/30![American Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” 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 6/135:00 pm
SAT
- MLI
1 stop5h 34m
Delta
Wed 6/175:56 am
MLI
- SAT
1 stop7h 39m
Delta
Deal found 5/29![Delta logo]()
$369
This United Airlines deal was found by Cheapflights users on 5/31. Clicking the “Pick Dates” 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 8/206:36 am
SAT
- STL
1 stop5h 26m
United Airlines
Tue 8/257:25 am
STL
- SAT
2 stops12h 33m
United Airlines
Deal found 5/31![United Airlines logo]()
$344
This American Airlines deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” 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 6/277:02 am
SAT
- PIA
1 stop4h 52m
American Airlines
Sun 7/57:13 pm
PIA
- SAT
1 stop4h 57m
American Airlines
Deal found 5/29![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/15:30 am
SAT
- MDW
2 stops6h 40m
Southwest
Mon 7/69:25 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 5/29![Southwest logo]()
$351
This United Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:57 pm
SAT
- ORD
1 stop5h 18m
United Airlines
Mon 8/37:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/30![United Airlines logo]()
$346
This Delta deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 9/310:46 am
SAT
- ORD
1 stop6h 05m
Delta
Mon 9/75:28 am
ORD
- SAT
1 stop8h 10m
Delta
Deal found 5/27![Delta logo]()
$387
This Southwest deal was found by Cheapflights users on 5/28. Clicking the “Pick Dates” 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 6/274:40 pm
SAT
- MDW
1 stop6h 35m
Southwest
Mon 6/299:25 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/28![Southwest logo]()
$377
This American Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/256:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Sat 6/274:42 pm
MLI
- SAT
1 stop7h 17m
American Airlines
Deal found 5/30![American Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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 8/185:27 pm
SAT
- MLI
1 stop5h 47m
United Airlines
Sat 8/226:00 am
MLI
- SAT
2 stops9h 43m
United Airlines
Deal found 5/26![United Airlines logo]()
$348
This Kiwi.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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.
Fri 6/1211:30 am
SAT
- RFD
2 stops47h 07m
Multiple Airlines
Fri 6/197:53 pm
RFD
- SAT
1 stop19h 44m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$513
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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 7/186:05 am
SAT
- MDW
1 stop7h 04m
Delta
Mon 7/206:00 am
MDW
- SAT
1 stop5h 09m
Delta
Deal found 5/26![Delta logo]()
$387
This Southwest deal was found by Cheapflights users on 5/31. Clicking the “Pick Dates” 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 7/96:30 pm
SAT
- MDW
1 stop4h 35m
Southwest
Mon 7/139:25 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 5/31![Southwest logo]()
$377
This American Airlines deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/225:35 pm
SAT
- CMI
1 stop4h 24m
American Airlines
Sun 7/266:36 pm
CMI
- SAT
1 stop5h 34m
American Airlines
Deal found 5/29![American Airlines logo]()
$345
This United Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 7/171:20 pm
SAT
- ORD
Nonstop3h 01m
United Airlines
Tue 7/211:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/30![United Airlines logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 7/159:32 pm
SAT
- RFD
1 stop14h 52m
Multiple Airlines
Mon 7/207:50 pm
RFD
- SAT
2 stops22h 54m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$536
This Delta deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 10/1012:50 pm
SAT
- MDW
1 stop5h 47m
Delta
Sun 10/1110:35 am
MDW
- SAT
1 stop6h 43m
Delta
Deal found 5/30![Delta logo]()
$411
This Southwest deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/275:20 pm
SAT
- MDW
1 stop5h 50m
Southwest
Mon 7/69:25 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 5/27![Southwest logo]()
$377
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated May 31, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated May 31, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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 6/187:51 pm
SAT
- ORD
1 stop24h 52m
Frontier
Mon 6/229:48 pm
ORD
- SAT
1 stop21h 08m
Frontier
Deal found 5/26![Frontier logo]()
$309
This CheapOair deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/228:56 pm
SAT
- STL
1 stop21h 55m
Frontier
Wed 6/247:46 pm
STL
- SAT
1 stop24h 25m
Frontier
Deal found 5/30![Frontier logo]()
$273
This CheapOair deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/228:56 pm
SAT
- STL
1 stop21h 55m
Frontier
Thu 6/252:56 pm
STL
- SAT
1 stop29h 15m
Frontier
Deal found 5/30![Frontier logo]()
$278
This CheapOair deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/237:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Sat 7/118:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 5/30![Frontier logo]()
$268
This American Airlines deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/232:10 pm
SAT
- ORD
Nonstop3h 02m
American Airlines
Tue 6/302:46 pm
ORD
- SAT
Nonstop3h 06m
American Airlines
Deal found 5/29![American Airlines logo]()
$306
This American Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/246:01 am
SAT
- MLI
1 stop4h 38m
American Airlines
Wed 7/156:50 pm
MLI
- SAT
1 stop5h 20m
American Airlines
Deal found 5/27![American Airlines logo]()
$291
This American Airlines deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” 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 6/246:05 am
SAT
- ORD
Nonstop3h 02m
American Airlines
Wed 7/1510:00 am
ORD
- SAT
Nonstop2h 50m
American Airlines
Deal found 5/29![American Airlines logo]()
$305
This United Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/241:20 pm
SAT
- ORD
Nonstop3h 09m
United Airlines
Wed 7/18:51 am
ORD
- SAT
1 stop6h 48m
United Airlines
Deal found 5/27![United Airlines logo]()
$307
This Booking.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/258:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Tue 6/308:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/27![Frontier logo]()
$275
This Booking.com deal was found by Cheapflights users on 5/28. Clicking the “Pick Dates” 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 6/258:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Thu 7/212:11 pm
STL
- SAT
1 stop8h 00m
Frontier
Deal found 5/28![Frontier logo]()
$280
This American Airlines deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 6/256:24 pm
SAT
- BMI
1 stop6h 11m
American Airlines
Thu 7/24:30 pm
BMI
- SAT
1 stop6h 34m
American Airlines
Deal found 5/30![American Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 6/276:05 am
SAT
- CMI
1 stop5h 00m
American Airlines
Sat 7/46:34 pm
CMI
- SAT
1 stop5h 25m
American Airlines
Deal found 5/27![American Airlines logo]()
$270
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 May 31, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated May 31, 2026.
This Delta deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” 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 8/2510:46 am
SAT
- ORD
1 stop8h 03m
Delta
Deal found 5/29![Delta logo]()
$108
This Super.com deal was found by Cheapflights users on 5/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/159:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 5/28![Frontier logo]()
$111
This Super.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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 6/238:56 pm
SAT
- ORD
1 stop8h 11m
Frontier
Deal found 5/26![Frontier logo]()
$114
This Frontier deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 5/30![Frontier logo]()
$115
This Southwest deal was found by Cheapflights users on 5/28. Clicking the “Pick Dates” 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 8/259:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 5/28![Southwest logo]()
$117
This Mytrip deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:51 pm
SAT
- ORD
1 stop14h 10m
Frontier
Deal found 5/27![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” 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.
Sat 7/44:22 pm
SAT
- ORD
1 stop6h 57m
Frontier
Deal found 5/29![Frontier logo]()
$128
This Frontier deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 7/254:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Deal found 5/30![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” 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 7/259:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 5/30![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” 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 7/114:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Deal found 5/27![Frontier logo]()
$130
This Frontier deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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 7/189:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 5/26![Frontier logo]()
$130
This American Airlines deal was found by Cheapflights users on 5/31. Clicking the “Pick Dates” 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 8/275:00 am
SAT
- STL
1 stop4h 24m
American Airlines
Deal found 5/31![American Airlines logo]()
$131
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 May 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $259 (American Airlines) |
One-way from | $108 (Delta) |
Popular in | December |
Cheapest in | September |
Average price | $392 |
Good round-trip deal | $357 or less |
Good one-way deal | $213 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 May 31, 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 AntonioChampaign
SAT - CMI
SATCMI
San Antonio
Sat 6/27
6:05 am-11:05 am
1 stop5h 00m
Champaign University-Willard
Sat 7/4
6:34 pm-11:59 pm
1 stop5h 25m
$270
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Tue 7/14
5:32 pm-8:33 pm
Nonstop3h 01m
Chicago O'Hare Intl
Tue 7/28
1:30 pm-4:29 pm
Nonstop2h 59m
$305
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Wed 7/8
7:20 pm-12:45 am
1 stop5h 25m
Chicago O'Hare Intl
Wed 7/15
9:25 am-12:29 pm
Nonstop3h 04m
$307
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Thu 6/25
6:24 pm-12:35 am
1 stop6h 11m
Bloomington-Normal
Thu 7/2
4:30 pm-11:04 pm
1 stop6h 34m
$309
San AntonioPeoria
SAT - PIA
SATPIA
San Antonio
Fri 7/10
6:57 pm-12:22 am
1 stop5h 25m
Greater Peoria
Sat 7/11
4:43 pm-10:00 pm
1 stop5h 17m
$319
San AntonioPeoria
SAT - PIA
SATPIA
San Antonio
Wed 7/8
6:57 pm-12:22 am
1 stop5h 25m
Greater Peoria
Tue 7/14
6:58 pm-12:10 am
1 stop5h 12m
$319
San AntonioPeoria
SAT - PIA
SATPIA
San Antonio
Sat 6/27
7:02 am-11:54 am
1 stop4h 52m
Greater Peoria
Sun 7/5
7:13 pm-12:10 am
1 stop4h 57m
$319
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Thu 10/22
2:20 pm-4:55 pm
Nonstop2h 35m
Chicago Midway
Mon 10/26
9:55 am-4:15 pm
2 stops6h 20m
$328
Quickest round-trip
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Sat 8/29
11:10 am-1:45 pm
Nonstop2h 35m
Chicago Midway
Sat 9/5
1:50 pm-4:30 pm
Nonstop2h 40m
$335
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Sat 8/1
6:40 am-9:38 am
Nonstop2h 58m
Chicago O'Hare Intl
Tue 8/4
7:58 pm-10:57 pm
Nonstop2h 59m
$336
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-STL
SAT-CMI
SAT-MLI
SAT-ORD
SAT-BMI
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-STL
SAT-CMI
SAT-MLI
SAT-ORD
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 $230). 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 May 31, 2026.
It’s optimal to fly from San Antonio to Illinois in the morning. By choosing this option you can save up to 40% on the cost of your flight, compared to a flight in the evening.
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 May 31, 2026.
The most flights from SAT to USIL are scheduled on a Friday (30 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 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 May 31, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest,United Airlines, andAmerican Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Spirit Airlines
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
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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Alternative routes for San Antonio to Illinois
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Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from San Antonio to Illinois by cabin class
Find flights from San Antonio to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on May 31, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 May 31, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$213 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$235 | Average$436 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$404 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$277 | Average$437 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$328 | FlexibilityNo cancel fee | On-timeN/A |