$120+ 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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Aug 26 — Sep 21
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 27, 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 27, 2026.
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:08 am
SAT
- STL
1 stop8h 07m
Frontier
Mon 9/2112:46 pm
STL
- SAT
1 stop8h 53m
Frontier
Deal found 7/24![Frontier logo]()
$240
This Frontier deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/137:49 pm
SAT
- STL
1 stop23h 34m
Frontier
Mon 8/178:08 pm
STL
- SAT
1 stop23h 23m
Frontier
Deal found 7/22![Frontier logo]()
$241
This Trip.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:51 am
SAT
- STL
1 stop6h 20m
Frontier
Tue 8/256:45 pm
STL
- SAT
1 stop26h 44m
Frontier
Deal found 7/22![Frontier logo]()
$256
This Trip.com deal was found by Cheapflights users on 7/26. 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.
Wed 9/163:19 pm
SAT
- STL
1 stop19h 58m
Frontier
Mon 9/2112:17 pm
STL
- SAT
1 stop8h 46m
Frontier
Deal found 7/26![Frontier logo]()
$257
This Trip.com deal was found by Cheapflights users on 7/26. 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.
Tue 9/810:24 pm
SAT
- STL
1 stop13h 08m
Frontier
Wed 9/98:10 pm
STL
- SAT
1 stop23h 15m
Frontier
Deal found 7/26![Frontier logo]()
$263
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1111:08 am
SAT
- ORD
1 stop10h 27m
Frontier
Wed 9/1610:40 pm
ORD
- SAT
1 stop11h 32m
Frontier
Deal found 7/24![Frontier logo]()
$268
This CheapOair deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 9/88:26 pm
SAT
- ORD
1 stop13h 35m
Frontier
Sat 9/1210:40 pm
ORD
- SAT
1 stop11h 32m
Frontier
Deal found 7/23![Frontier logo]()
$269
This Super.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 9/88:26 pm
SAT
- ORD
1 stop25h 09m
Frontier
Sat 9/1910:40 pm
ORD
- SAT
1 stop11h 32m
Frontier
Deal found 7/23![Frontier logo]()
$272
This Trip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/149:50 pm
SAT
- ORD
1 stop7h 48m
Frontier
Thu 9/173:50 pm
ORD
- SAT
1 stop17h 20m
Frontier
Deal found 7/24![Frontier logo]()
$275
This CheapOair deal was found by Cheapflights users on 7/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:26 pm
SAT
- ORD
1 stop17h 10m
Frontier
Mon 9/78:11 pm
ORD
- SAT
1 stop25h 18m
Frontier
Deal found 7/26![Frontier logo]()
$276
This Super.com deal was found by Cheapflights users on 7/26. 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.
Thu 8/2010:24 pm
SAT
- ORD
1 stop20h 38m
Frontier
Mon 8/248:11 pm
ORD
- SAT
1 stop25h 18m
Frontier
Deal found 7/26![Frontier logo]()
$277
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/110:34 pm
SAT
- ORD
1 stop13h 23m
Frontier
Mon 10/56:50 am
ORD
- SAT
1 stop14h 49m
Frontier
Deal found 7/24![Frontier logo]()
$278
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 27, 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 27, 2026.
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 9/1911:10 am
SAT
- MDW
Nonstop2h 35m
Southwest
Mon 9/218:35 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 7/25![Southwest logo]()
$297
This American Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/207:28 am
SAT
- STL
1 stop5h 26m
American Airlines
Tue 8/254:54 pm
STL
- SAT
1 stop7h 54m
American Airlines
Deal found 7/25![American Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 7/27. 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 9/35:20 am
SAT
- STL
1 stop6h 26m
Delta
Sun 9/66:00 am
STL
- SAT
1 stop7h 38m
Delta
Deal found 7/27![Delta logo]()
$317
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/2012:55 pm
SAT
- PIA
1 stop6h 08m
United Airlines
Thu 8/2710:41 am
PIA
- SAT
2 stops9h 17m
United Airlines
Deal found 7/23![United Airlines logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 7/27. 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.
Thu 9/1712:39 pm
SAT
- RFD
1 stop8h 00m
Multiple Airlines
Sun 9/279:29 pm
RFD
- SAT
1 stop14h 15m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$390
This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/112:15 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Mon 9/148:35 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 7/24![Southwest logo]()
$302
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1712:50 pm
SAT
- MDW
1 stop5h 47m
Delta
Mon 12/215:59 pm
MDW
- SAT
1 stop5h 21m
Delta
Deal found 7/23![Delta logo]()
$317
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/126:52 pm
SAT
- MLI
1 stop5h 16m
American Airlines
Tue 8/184:32 pm
MLI
- SAT
1 stop6h 18m
American Airlines
Deal found 7/22![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/112:15 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Tue 9/158:30 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 7/24![Southwest logo]()
$302
This Delta deal was found by Cheapflights users on 7/26. 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.
Mon 9/214:21 pm
SAT
- MDW
1 stop6h 23m
Delta
Thu 9/242:00 pm
MDW
- SAT
1 stop7h 22m
Delta
Deal found 7/26![Delta logo]()
$317
This American Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/267:28 am
SAT
- BMI
1 stop5h 39m
American Airlines
Sun 8/304:49 pm
BMI
- SAT
1 stop5h 11m
American Airlines
Deal found 7/24![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 7/26. 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.
Fri 8/216:30 am
SAT
- ORD
Nonstop2h 59m
United Airlines
Wed 8/2610:40 am
ORD
- SAT
1 stop5h 03m
United Airlines
Deal found 7/26![United Airlines logo]()
$354
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/193:30 pm
SAT
- STL
Nonstop2h 10m
Southwest
Wed 8/264:45 pm
STL
- SAT
1 stop3h 45m
Southwest
Deal found 7/22![Southwest logo]()
$307
This American Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:54 pm
SAT
- BMI
1 stop4h 59m
American Airlines
Sat 9/121:19 pm
BMI
- SAT
2 stops8h 40m
American Airlines
Deal found 7/24![American Airlines logo]()
$324
This Delta deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/1211:29 am
SAT
- MDW
1 stop7h 04m
Delta
Sat 8/151:51 pm
MDW
- SAT
1 stop7h 38m
Delta
Deal found 7/22![Delta logo]()
$327
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/215:27 pm
SAT
- PIA
1 stop5h 16m
United Airlines
Fri 8/2810:41 am
PIA
- SAT
2 stops10h 35m
United Airlines
Deal found 7/24![United Airlines logo]()
$362
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:39 pm
SAT
- RFD
1 stop8h 00m
Multiple Airlines
Sun 9/139:29 pm
RFD
- SAT
2 stops21h 56m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 9/37:20 am
SAT
- STL
Nonstop2h 05m
Southwest
Thu 9/106:05 am
STL
- SAT
1 stop6h 20m
Southwest
Deal found 7/23![Southwest logo]()
$307
This American Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/306:52 pm
SAT
- PIA
1 stop5h 07m
American Airlines
Sun 9/66:48 pm
PIA
- SAT
1 stop6h 00m
American Airlines
Deal found 7/24![American Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/46:25 am
SAT
- BMI
1 stop5h 02m
Delta
Mon 9/144:32 pm
BMI
- SAT
1 stop7h 36m
Delta
Deal found 7/24![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/305:30 pm
SAT
- PIA
1 stop5h 13m
United Airlines
Sun 9/65:45 am
PIA
- SAT
2 stops9h 58m
United Airlines
Deal found 7/24![United Airlines logo]()
$362
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 10/85:45 pm
SAT
- STL
1 stop5h 25m
Southwest
Mon 10/129:45 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/23![Southwest logo]()
$307
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/229:25 am
SAT
- RFD
2 stops22h 29m
Multiple Airlines
Sun 10/258:53 pm
RFD
- SAT
1 stop14h 55m
Multiple Airlines
Deal found 7/24![Multiple Airlines logo]()
$430
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/246:10 pm
SAT
- MDW
1 stop5h 35m
Southwest
Mon 9/288:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 7/22![Southwest logo]()
$307
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 11/141:52 pm
SAT
- MLI
1 stop7h 20m
United Airlines
Tue 11/178:46 am
MLI
- SAT
1 stop8h 09m
United Airlines
Deal found 7/23![United Airlines logo]()
$373
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1712:45 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Tue 10/206:00 am
MDW
- SAT
1 stop4h 45m
Southwest
Deal found 7/23![Southwest logo]()
$307
This American Airlines deal was found by Cheapflights users on 7/26. 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 8/77:28 am
SAT
- BMI
1 stop5h 39m
American Airlines
Sat 8/154:49 pm
BMI
- SAT
1 stop5h 11m
American Airlines
Deal found 7/26![American Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 7/26. 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 8/112:15 pm
SAT
- PIA
2 stops8h 28m
United Airlines
Sat 8/155:45 am
PIA
- SAT
1 stop6h 07m
United Airlines
Deal found 7/26![United Airlines logo]()
$384
This Delta deal was found by Cheapflights users on 7/27. 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.
Fri 8/72:43 pm
SAT
- MLI
1 stop7h 36m
Delta
Mon 8/175:09 pm
MLI
- SAT
1 stop7h 19m
Delta
Deal found 7/27![Delta logo]()
$399
This Southwest deal was found by Cheapflights users on 7/27. 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 9/37:20 am
SAT
- STL
Nonstop2h 05m
Southwest
Sun 9/68:20 am
STL
- SAT
1 stop4h 15m
Southwest
Deal found 7/27![Southwest logo]()
$312
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated July 27, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated July 27, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/137:49 pm
SAT
- STL
1 stop23h 34m
Frontier
Mon 8/178:08 pm
STL
- SAT
1 stop23h 23m
Frontier
Deal found 7/22![Frontier logo]()
$241
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/135:15 am
SAT
- MDW
1 stop7h 24m
Delta
Thu 8/2012:46 pm
MDW
- SAT
1 stop6h 00m
Delta
Deal found 7/23![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/197:10 am
SAT
- STL
Nonstop2h 05m
Southwest
Wed 8/268:45 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 7/22![Southwest logo]()
$297
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/199:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Wed 8/198:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 7/22![Southwest logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:26 pm
SAT
- STL
2 stops20h 56m
Frontier
Mon 8/247:58 pm
STL
- SAT
1 stop23h 33m
Frontier
Deal found 7/22![Frontier logo]()
$303
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:20 am
SAT
- STL
Nonstop2h 05m
Southwest
Mon 8/246:25 am
STL
- SAT
1 stop5h 15m
Southwest
Deal found 7/22![Southwest logo]()
$307
This Southwest deal was found by Cheapflights users on 7/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:10 pm
SAT
- MDW
1 stop5h 35m
Southwest
Mon 8/248:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 7/26![Southwest logo]()
$307
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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
Mon 8/245:42 am
STL
- SAT
1 stop4h 19m
American Airlines
Deal found 7/22![American Airlines logo]()
$317
This Trip.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:51 am
SAT
- STL
1 stop6h 20m
Frontier
Tue 8/256:45 pm
STL
- SAT
1 stop26h 44m
Frontier
Deal found 7/22![Frontier logo]()
$256
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/243:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Sat 8/2910:15 am
MDW
- SAT
2 stops7h 45m
Southwest
Deal found 7/23![Southwest logo]()
$318
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Mon 8/318:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 7/22![Southwest logo]()
$303
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/315:30 am
SAT
- STL
1 stop7h 10m
United Airlines
Thu 10/16:15 am
STL
- SAT
1 stop4h 28m
United Airlines
Deal found 7/23![United Airlines logo]()
$312
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 27, 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 27, 2026.
This Frontier deal was found by Cheapflights users on 7/27. 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 10/2412:16 pm
SAT
- STL
1 stop6h 59m
Frontier
Deal found 7/27![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 7/27. 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.
Thu 10/2911:08 am
SAT
- STL
1 stop8h 07m
Frontier
Deal found 7/27![Frontier logo]()
$124
This Frontier deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/198:37 pm
SAT
- ORD
1 stop9h 05m
Frontier
Deal found 7/22![Frontier logo]()
$124
This Expedia deal was found by Cheapflights users on 7/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2612:43 pm
SAT
- STL
1 stop12h 34m
Frontier
Deal found 7/27![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/194:53 pm
SAT
- STL
3 stops48h 29m
Multiple Airlines
Deal found 7/23![Multiple Airlines logo]()
$128
This Trip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/2410:24 pm
SAT
- STL
1 stop19h 26m
Frontier
Deal found 7/25![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 9/289:50 pm
SAT
- ORD
1 stop7h 48m
Frontier
Deal found 7/25![Frontier logo]()
$129
This Expedia deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/219:57 am
SAT
- ORD
1 stop13h 58m
Frontier
Deal found 7/22![Frontier logo]()
$130
This Super.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/179:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 7/23![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/264:53 pm
SAT
- STL
3 stops24h 29m
Multiple Airlines
Deal found 7/23![Multiple Airlines logo]()
$135
This Frontier deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/249:51 am
SAT
- ORD
1 stop13h 17m
Frontier
Deal found 7/22![Frontier logo]()
$135
This Priceline deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/259:50 pm
SAT
- ORD
1 stop7h 48m
Frontier
Deal found 7/25![Frontier logo]()
$136
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 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $240 (Frontier) |
One-way from | $120 (Frontier) |
Popular in | June |
Cheapest in | September |
Average price | $398 |
Good round-trip deal | $328 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 27, 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
Quickest round-trip
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Sat 9/19
11:10 am-1:45 pm
Nonstop2h 35m
Chicago Midway
Mon 9/21
8:35 pm-11:20 pm
Nonstop2h 45m
$297
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Fri 9/11
2:15 pm-4:50 pm
Nonstop2h 35m
Chicago Midway
Mon 9/14
8:35 pm-11:20 pm
Nonstop2h 45m
$302
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Fri 9/11
2:15 pm-4:50 pm
Nonstop2h 35m
Chicago Midway
Tue 9/15
8:30 pm-11:15 pm
Nonstop2h 45m
$302
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 8/20
7:28 am-12:54 pm
1 stop5h 26m
Lambert-St Louis
Tue 8/25
4:54 pm-12:48 am
1 stop7h 54m
$307
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Wed 8/19
3:30 pm-5:40 pm
Nonstop2h 10m
Lambert-St Louis
Wed 8/26
4:45 pm-8:30 pm
1 stop3h 45m
$307
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 9/3
7:20 am-9:25 am
Nonstop2h 05m
Lambert-St Louis
Thu 9/10
6:05 am-12:25 pm
1 stop6h 20m
$307
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 10/8
5:45 pm-11:10 pm
1 stop5h 25m
Lambert-St Louis
Mon 10/12
9:45 pm-11:55 pm
Nonstop2h 10m
$307
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Thu 9/24
6:10 pm-11:45 pm
1 stop5h 35m
Chicago Midway
Mon 9/28
8:35 pm-11:15 pm
Nonstop2h 40m
$307
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Sat 10/17
12:45 pm-3:25 pm
Nonstop2h 40m
Chicago Midway
Tue 10/20
6:00 am-10:45 am
1 stop4h 45m
$307
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 9/3
7:20 am-9:25 am
Nonstop2h 05m
Lambert-St Louis
Sun 9/6
8:20 am-12:35 pm
1 stop4h 15m
$312
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-ORD
SAT-MDW
SAT-PIA
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-STL
SAT-ORD
SAT-MDW
SAT-PIA
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, September is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $336). Flying from San Antonio to Illinois in June is currently the most expensive (average of $439). 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 27, 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 27, 2026.
The most flights from SAT to USIL are scheduled on a Monday (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?
Airfare is typical for this route at the moment.
San Antonio to Illinois flights typically cost between $235 and $408 in September.The cheapest round-trip price found within the last 5 days was $268 on Frontier (Sep 11-Sep 16).
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 27, 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.
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
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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Alternative routes for San Antonio to Illinois
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Complete your trip
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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 July 27, 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 July 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$223 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$235 | Average$431 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$279 | Average$441 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$287 | Average$441 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$323 | FlexibilityNo cancel fee | On-timeN/A |