$99+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jun 5 — Jun 121
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 6, 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 6, 2026.
This CheapOair deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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 5/289:09 pm
SAT
- STL
1 stop23h 02m
Frontier
Sun 5/318:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Deal found 5/4![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/289:09 pm
SAT
- STL
1 stop23h 02m
Frontier
Mon 6/18:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Deal found 5/5![Frontier logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 6/27:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Tue 6/96:31 pm
STL
- SAT
2 stops48h 25m
Frontier
Deal found 5/3![Frontier logo]()
$259
This Kiwi.com deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Fri 8/288:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/2![Frontier logo]()
$265
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:32 pm
SAT
- MLI
1 stop5h 42m
United Airlines
Tue 8/113:44 pm
MLI
- SAT
1 stop7h 11m
United Airlines
Deal found 5/5![United Airlines logo]()
$266
This eDestinos deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/167:51 pm
SAT
- STL
2 stops13h 01m
Frontier
Tue 6/236:31 pm
STL
- SAT
2 stops24h 25m
Frontier
Deal found 5/2![Frontier logo]()
$270
This American Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/306:05 am
SAT
- CMI
1 stop4h 58m
American Airlines
Tue 7/76:36 pm
CMI
- SAT
1 stop5h 34m
American Airlines
Deal found 5/2![American Airlines logo]()
$270
This American Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/306:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Tue 7/146:50 pm
MLI
- SAT
1 stop5h 20m
American Airlines
Deal found 5/1![American Airlines logo]()
$273
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/245:00 pm
SAT
- MLI
1 stop5h 34m
Delta
Wed 7/155:56 am
MLI
- SAT
1 stop7h 36m
Delta
Deal found 5/1![Delta logo]()
$284
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 5/276:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Wed 6/107:59 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/3![United Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/162:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Tue 6/239:00 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/1![Southwest logo]()
$297
This American Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/166:00 am
SAT
- ORD
Nonstop3h 02m
American Airlines
Tue 6/239:00 pm
ORD
- SAT
Nonstop2h 59m
American Airlines
Deal found 5/1![American Airlines logo]()
$298
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 6, 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 6, 2026.
This American Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/306:05 am
SAT
- CMI
1 stop4h 58m
American Airlines
Tue 7/76:36 pm
CMI
- SAT
1 stop5h 34m
American Airlines
Deal found 5/2![American Airlines logo]()
$270
This Delta deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/242:40 pm
SAT
- MLI
1 stop7h 54m
Delta
Wed 7/155:56 am
MLI
- SAT
1 stop7h 36m
Delta
Deal found 5/2![Delta logo]()
$284
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:32 pm
SAT
- MLI
1 stop5h 42m
United Airlines
Tue 8/112:29 pm
MLI
- SAT
2 stops8h 09m
United Airlines
Deal found 5/5![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 6/92:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Sat 6/138:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/3![Southwest logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 7/88:59 pm
SAT
- RFD
1 stop15h 25m
Multiple Airlines
Sun 7/121:14 pm
RFD
- SAT
2 stops29h 40m
Multiple Airlines
Deal found 5/2![Multiple Airlines logo]()
$472
This Delta deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/317:40 am
SAT
- BMI
1 stop7h 54m
Delta
Sun 8/94:24 pm
BMI
- SAT
1 stop8h 04m
Delta
Deal found 5/3![Delta logo]()
$309
This American Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 8/15:35 pm
SAT
- BMI
1 stop5h 34m
American Airlines
Mon 8/104:48 pm
BMI
- SAT
1 stop6h 02m
American Airlines
Deal found 5/2![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 6/96:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Sat 6/139:10 am
ORD
- SAT
Nonstop3h 04m
United Airlines
Deal found 5/3![United Airlines logo]()
$332
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 5/275:00 pm
SAT
- BMI
1 stop5h 30m
Delta
Sun 5/314:14 pm
BMI
- SAT
1 stop6h 17m
Delta
Deal found 5/1![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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 5/297:45 pm
SAT
- MDW
1 stop4h 10m
Southwest
Wed 6/39:00 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 5/4![Southwest logo]()
$342
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Sun 6/146:51 pm
MLI
- SAT
1 stop5h 08m
American Airlines
Deal found 5/5![American Airlines logo]()
$327
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/217:20 pm
SAT
- ORD
1 stop5h 25m
United Airlines
Sat 7/257:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/5![United Airlines logo]()
$346
This Delta deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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 9/178:00 am
SAT
- MLI
1 stop8h 22m
Delta
Mon 9/215:55 am
MLI
- SAT
1 stop7h 12m
Delta
Deal found 5/4![Delta logo]()
$315
This Southwest deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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 6/235:30 am
SAT
- MDW
2 stops6h 40m
Southwest
Mon 6/299:25 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/4![Southwest logo]()
$347
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/85:35 pm
SAT
- PIA
1 stop6h 05m
American Airlines
Sat 7/1112:25 pm
PIA
- SAT
1 stop6h 05m
American Airlines
Deal found 5/5![American Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/115:30 am
SAT
- ORD
1 stop6h 59m
United Airlines
Wed 7/221:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/5![United Airlines logo]()
$346
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/65:00 pm
SAT
- ORD
1 stop6h 03m
Delta
Mon 6/85:30 am
ORD
- SAT
1 stop8h 05m
Delta
Deal found 5/1![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 10/82:20 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Sat 10/1011:30 am
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/1![Southwest logo]()
$367
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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
- BMI
2 stops10h 31m
American Airlines
Sat 7/45:00 am
BMI
- SAT
2 stops9h 58m
American Airlines
Deal found 5/5![American Airlines logo]()
$345
This Kiwi.com deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 5/278:59 pm
SAT
- RFD
1 stop15h 22m
Multiple Airlines
Sun 5/3111:27 am
RFD
- SAT
1 stop28h 49m
Multiple Airlines
Deal found 5/1![Multiple Airlines logo]()
$472
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 9/215:20 am
SAT
- MDW
1 stop7h 10m
Delta
Thu 9/246:00 am
MDW
- SAT
1 stop7h 07m
Delta
Deal found 5/5![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 10/82:01 pm
SAT
- ORD
Nonstop2h 50m
United Airlines
Sat 10/109:17 am
ORD
- SAT
Nonstop2h 53m
United Airlines
Deal found 5/1![United Airlines logo]()
$367
This Southwest deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/62:00 pm
SAT
- MDW
2 stops7h 10m
Southwest
Tue 6/95:50 pm
MDW
- SAT
1 stop4h 30m
Southwest
Deal found 5/2![Southwest logo]()
$373
This Kiwi.com deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/138:56 pm
SAT
- RFD
1 stop15h 27m
Multiple Airlines
Thu 6/1811:27 am
RFD
- SAT
2 stops23h 23m
Multiple Airlines
Deal found 5/2![Multiple Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 7/111:20 pm
SAT
- ORD
Nonstop3h 02m
United Airlines
Mon 7/131:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/2![United Airlines logo]()
$367
This American Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 6/16:27 pm
SAT
- BMI
1 stop5h 32m
American Airlines
Sun 6/76:02 pm
BMI
- SAT
1 stop5h 57m
American Airlines
Deal found 5/3![American Airlines logo]()
$372
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 5/195:00 pm
SAT
- MLI
1 stop5h 21m
Delta
Thu 6/45:56 am
MLI
- SAT
1 stop7h 36m
Delta
Deal found 5/1![Delta logo]()
$342
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/186:30 pm
SAT
- MDW
1 stop4h 30m
Southwest
Tue 6/2310:25 am
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/1![Southwest logo]()
$377
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/187:20 pm
SAT
- ORD
1 stop5h 25m
United Airlines
Thu 6/257:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/5![United Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 5/202:27 pm
SAT
- MLI
1 stop7h 54m
Delta
Tue 6/95:56 am
MLI
- SAT
1 stop7h 39m
Delta
Deal found 5/1![Delta logo]()
$346
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated May 6, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated May 6, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 5/197:54 pm
SAT
- ORD
2 stops12h 01m
Frontier
Wed 5/279:37 pm
ORD
- SAT
1 stop21h 22m
Frontier
Deal found 5/3![Frontier logo]()
$301
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 5/276:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Wed 6/107:59 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/3![United Airlines logo]()
$297
This Mytrip deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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.
Wed 5/277:54 pm
SAT
- ORD
1 stop24h 38m
Multiple Airlines
Sun 5/315:05 am
ORD
- SAT
1 stop11h 11m
Multiple Airlines
Deal found 5/1![Multiple Airlines logo]()
$302
This CheapOair deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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 5/289:09 pm
SAT
- STL
1 stop23h 02m
Frontier
Sun 5/318:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Deal found 5/4![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/289:09 pm
SAT
- STL
1 stop23h 02m
Frontier
Mon 6/18:08 pm
STL
- SAT
1 stop22h 51m
Frontier
Deal found 5/5![Frontier logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 6/27:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Tue 6/96:31 pm
STL
- SAT
2 stops48h 25m
Frontier
Deal found 5/3![Frontier logo]()
$259
This eDestinos deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/167:51 pm
SAT
- STL
2 stops13h 01m
Frontier
Tue 6/236:31 pm
STL
- SAT
2 stops24h 25m
Frontier
Deal found 5/2![Frontier logo]()
$270
This Southwest deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 6/169:20 am
SAT
- MDW
Nonstop2h 35m
Southwest
Tue 6/239:00 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/3![Southwest logo]()
$297
This American Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/166:00 am
SAT
- ORD
Nonstop3h 02m
American Airlines
Tue 6/239:00 pm
ORD
- SAT
Nonstop2h 59m
American Airlines
Deal found 5/1![American Airlines logo]()
$298
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/245:00 pm
SAT
- MLI
1 stop5h 34m
Delta
Wed 7/155:56 am
MLI
- SAT
1 stop7h 36m
Delta
Deal found 5/1![Delta logo]()
$284
This American Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/306:05 am
SAT
- CMI
1 stop4h 58m
American Airlines
Tue 7/76:36 pm
CMI
- SAT
1 stop5h 34m
American Airlines
Deal found 5/2![American Airlines logo]()
$270
This American Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/306:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Tue 7/146:50 pm
MLI
- SAT
1 stop5h 20m
American Airlines
Deal found 5/1![American Airlines logo]()
$273
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 6, 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 6, 2026.
This Trip.com deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 5/188:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Deal found 5/2![Frontier logo]()
$99
This Frontier deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/274:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Deal found 5/1![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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.
Mon 8/104:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Deal found 5/5![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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 6/264:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Deal found 5/4![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 5/267:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/1![Frontier logo]()
$121
This CheapOair deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 5/128:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Deal found 5/2![Frontier logo]()
$122
This Expedia deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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.
Mon 6/298:56 pm
SAT
- STL
1 stop21h 55m
Frontier
Deal found 5/4![Frontier logo]()
$123
This Trip.com deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 5/118:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Deal found 5/2![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/27:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/5![Frontier logo]()
$135
This Trip.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/227:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 5/4![Frontier logo]()
$136
This Super.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/257:54 pm
SAT
- ORD
1 stop24h 38m
Frontier
Deal found 5/5![Frontier logo]()
$141
This Frontier deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” 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 6/278:56 pm
SAT
- ORD
1 stop8h 11m
Frontier
Deal found 5/4![Frontier logo]()
$145
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 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $205 (CheapOair) |
One-way from | $99 (Trip.com) |
Popular in | December |
Cheapest in | September |
Average price | $378 |
Good round-trip deal | $367 or less |
Good one-way deal | $221 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 6, 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
Tue 6/30
6:05 am-11:03 am
1 stop4h 58m
Champaign University-Willard
Tue 7/7
6:36 pm-12:10 am
1 stop5h 34m
$270
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Wed 6/24
2:40 pm-10:34 pm
1 stop7h 54m
Moline Quad-City
Wed 7/15
5:56 am-1:32 pm
1 stop7h 36m
$284
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Fri 7/31
7:40 am-3:34 pm
1 stop7h 54m
Bloomington-Normal
Sun 8/9
4:24 pm-12:28 am
1 stop8h 04m
$309
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Sat 8/1
5:35 pm-11:09 pm
1 stop5h 34m
Bloomington-Normal
Mon 8/10
4:48 pm-10:50 pm
1 stop6h 02m
$309
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Wed 5/27
5:00 pm-10:30 pm
1 stop5h 30m
Bloomington-Normal
Sun 5/31
4:14 pm-10:31 pm
1 stop6h 17m
$309
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Thu 9/17
8:00 am-4:22 pm
1 stop8h 22m
Moline Quad-City
Mon 9/21
5:55 am-1:07 pm
1 stop7h 12m
$315
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Fri 6/12
6:24 pm-12:11 am
1 stop5h 47m
Moline Quad-City
Sun 6/14
6:51 pm-11:59 pm
1 stop5h 08m
$327
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Sat 6/6
5:00 pm-11:03 pm
1 stop6h 03m
Chicago O'Hare Intl
Mon 6/8
5:30 am-1:35 pm
1 stop8h 05m
$329
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Mon 9/21
5:20 am-12:30 pm
1 stop7h 10m
Chicago Midway
Thu 9/24
6:00 am-1:07 pm
1 stop7h 07m
$329
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Wed 8/5
5:32 pm-11:14 pm
1 stop5h 42m
Moline Quad-City
Tue 8/11
2:29 pm-10:38 pm
2 stops8h 09m
$332
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-MLI
SAT-CMI
SAT-ORD
SAT-MDW
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-MLI
SAT-CMI
SAT-ORD
How far ahead should I book a flight from San Antonio to Illinois?
Booking 21 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.
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 $218). 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 6, 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 6, 2026.
The most flights from SAT to USIL are scheduled on a Monday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).
How much does it cost to fly round-trip from San Antonio to Illinois?
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 6, 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.
Overall
7.9
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
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
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San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on May 6, 2026.
Popular flight searches
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San Antonio to Illinois flights
Consider these flights traveling from San Antonio to Illinois.
Top 6 airlines flying from San Antonio to Illinois
Discover the top 6 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 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$213 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$247 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$217 | Average$415 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$247 | Average$410 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$400 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$306 | Average$328 | FlexibilityNo cancel fee | On-timeN/A |