$104+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jul 16 — Jul 231
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 June 16, 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 June 16, 2026.
This CheapOair deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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 8/139:32 pm
SAT
- STL
1 stop20h 43m
Frontier
Sat 8/228:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 6/16![Frontier logo]()
$254
This CheapOair deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/147:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Tue 7/218:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/12![Frontier logo]()
$264
This CheapOair deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Tue 8/256:58 pm
STL
- SAT
1 stop25h 13m
Frontier
Deal found 6/11![Frontier logo]()
$268
This CheapOair deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/209:51 am
SAT
- STL
1 stop14h 08m
Frontier
Wed 7/227:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/12![Frontier logo]()
$271
This CheapOair deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/219:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Thu 7/234:09 pm
STL
- SAT
1 stop16h 47m
Frontier
Deal found 6/11![Frontier logo]()
$273
This Booking.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Mon 7/68:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/11![Frontier logo]()
$275
This CheapOair deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/153:10 pm
SAT
- STL
1 stop28h 05m
Frontier
Mon 10/198:10 pm
STL
- SAT
1 stop15h 11m
Frontier
Deal found 6/11![Frontier logo]()
$277
This CheapOair deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/279:51 am
SAT
- STL
1 stop14h 08m
Frontier
Thu 7/307:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 6/13![Frontier logo]()
$278
This Trip.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/157:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Wed 7/227:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/14![Frontier logo]()
$282
This Trip.com deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 8/67:49 pm
SAT
- STL
1 stop23h 34m
Frontier
Mon 8/108:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Deal found 6/15![Frontier logo]()
$287
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/256:01 am
SAT
- MLI
1 stop4h 38m
American Airlines
Sat 8/14:44 pm
MLI
- SAT
1 stop7h 14m
American Airlines
Deal found 6/15![American Airlines logo]()
$293
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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
Tue 8/251:15 pm
MLI
- SAT
2 stops8h 01m
United Airlines
Deal found 6/16![United 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 June 16, 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 June 16, 2026.
This CheapOair deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Tue 8/256:58 pm
STL
- SAT
1 stop25h 13m
Frontier
Deal found 6/11![Frontier logo]()
$268
This Southwest deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 9/99:25 am
SAT
- MDW
Nonstop2h 35m
Southwest
Thu 9/108:35 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/15![Southwest logo]()
$305
This American Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/116:01 am
SAT
- MLI
1 stop4h 38m
American Airlines
Sat 7/1811:28 am
MLI
- SAT
1 stop6h 34m
American Airlines
Deal found 6/13![American Airlines logo]()
$306
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 8/56:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Wed 8/122:42 pm
ORD
- SAT
1 stop6h 10m
United Airlines
Deal found 6/15![United Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/611:29 am
SAT
- MDW
1 stop7h 04m
Delta
Wed 9/231:00 pm
MDW
- SAT
1 stop5h 38m
Delta
Deal found 6/11![Delta logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:32 pm
SAT
- RFD
1 stop14h 52m
Multiple Airlines
Mon 8/37:50 pm
RFD
- SAT
2 stops24h 47m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$411
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/265:30 am
SAT
- BMI
1 stop5h 53m
Delta
Mon 9/284:23 pm
BMI
- SAT
1 stop7h 53m
Delta
Deal found 6/13![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/510:50 am
SAT
- MDW
1 stop6h 05m
Southwest
Wed 9/231:55 pm
MDW
- SAT
1 stop4h 00m
Southwest
Deal found 6/14![Southwest logo]()
$312
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/105:32 pm
SAT
- MLI
1 stop5h 44m
United Airlines
Thu 7/163:47 pm
MLI
- SAT
1 stop7h 10m
United Airlines
Deal found 6/15![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/15:35 pm
SAT
- BMI
1 stop5h 33m
American Airlines
Sun 7/56:00 pm
BMI
- SAT
1 stop6h 10m
American Airlines
Deal found 6/15![American Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:30 am
SAT
- MDW
1 stop6h 40m
Delta
Tue 9/85:45 pm
MDW
- SAT
1 stop5h 01m
Delta
Deal found 6/14![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/102:05 pm
SAT
- MDW
1 stop4h 45m
Southwest
Mon 10/129:30 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 6/11![Southwest logo]()
$335
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:30 am
SAT
- STL
1 stop4h 45m
United Airlines
Wed 8/198:00 am
STL
- SAT
2 stops9h 43m
United Airlines
Deal found 6/11![United Airlines logo]()
$342
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 6/12![American Airlines logo]()
$345
This Delta deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/282:43 pm
SAT
- MLI
1 stop7h 36m
Delta
Sun 8/306:00 am
MLI
- SAT
1 stop5h 10m
Delta
Deal found 6/14![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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
Mon 10/129:30 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 6/13![Southwest logo]()
$340
This Delta deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 8/262:43 pm
SAT
- ORD
1 stop6h 12m
Delta
Mon 8/315:20 pm
ORD
- SAT
1 stop5h 14m
Delta
Deal found 6/15![Delta logo]()
$325
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:30 pm
SAT
- PIA
1 stop5h 29m
United Airlines
Sat 9/266:15 am
PIA
- SAT
2 stops9h 38m
United Airlines
Deal found 6/14![United Airlines logo]()
$361
This American Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:00 am
SAT
- BMI
2 stops6h 49m
American Airlines
Mon 9/284:24 pm
BMI
- SAT
1 stop5h 35m
American Airlines
Deal found 6/13![American Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:20 am
SAT
- MDW
Nonstop2h 35m
Southwest
Tue 8/48:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/11![Southwest logo]()
$340
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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 11/305:00 pm
SAT
- MLI
1 stop7h 14m
United Airlines
Sat 12/58:10 am
MLI
- SAT
1 stop7h 28m
United Airlines
Deal found 6/16![United Airlines logo]()
$366
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:15 am
SAT
- MDW
1 stop7h 24m
Delta
Mon 8/106:05 am
MDW
- SAT
1 stop5h 05m
Delta
Deal found 6/13![Delta logo]()
$333
This Southwest deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/83:35 pm
SAT
- STL
Nonstop2h 10m
Southwest
Tue 7/149:20 pm
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 6/15![Southwest logo]()
$353
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/135:35 pm
SAT
- PIA
1 stop6h 05m
American Airlines
Sun 7/197:13 pm
PIA
- SAT
1 stop4h 57m
American Airlines
Deal found 6/15![American Airlines logo]()
$399
This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:32 pm
SAT
- RFD
1 stop14h 52m
Multiple Airlines
Sun 7/261:14 pm
RFD
- SAT
2 stops29h 30m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$534
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:30 am
SAT
- STL
2 stops10h 08m
United Airlines
Tue 8/257:00 am
STL
- SAT
1 stop8h 10m
United Airlines
Deal found 6/11![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:25 am
SAT
- MDW
1 stop5h 26m
Delta
Sun 9/2710:48 am
MDW
- SAT
1 stop6h 10m
Delta
Deal found 6/11![Delta logo]()
$358
This Southwest deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/156:25 pm
SAT
- STL
1 stop3h 40m
Southwest
Wed 7/228:25 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 6/14![Southwest logo]()
$359
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:40 am
SAT
- MLI
1 stop7h 11m
United Airlines
Sat 10/318:50 am
MLI
- SAT
1 stop7h 40m
United Airlines
Deal found 6/11![United Airlines logo]()
$373
This Kiwi.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/99:55 am
SAT
- RFD
2 stops21h 54m
Multiple Airlines
Fri 7/107:50 pm
RFD
- SAT
1 stop19h 51m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$560
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated June 16, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 6/306:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Tue 6/307:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 6/15![United Airlines logo]()
$305
This American Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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 7/15:35 pm
SAT
- MLI
1 stop5h 55m
American Airlines
Wed 7/86:50 pm
MLI
- SAT
1 stop5h 20m
American Airlines
Deal found 6/16![American Airlines logo]()
$306
This Booking.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Tue 7/77:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/12![Frontier logo]()
$268
This Booking.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Mon 7/68:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/11![Frontier logo]()
$275
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/411:55 am
SAT
- MDW
Nonstop2h 35m
Southwest
Wed 7/89:00 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 6/11![Southwest logo]()
$305
This CheapOair deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/147:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Tue 7/218:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/12![Frontier logo]()
$264
This Trip.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/157:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Wed 7/227:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/14![Frontier logo]()
$282
This CheapOair deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair 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
Sat 7/189:57 pm
ORD
- SAT
1 stop20h 47m
Frontier
Deal found 6/14![Frontier logo]()
$304
This CheapOair deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/209:51 am
SAT
- STL
1 stop14h 08m
Frontier
Wed 7/227:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/12![Frontier logo]()
$271
This CheapOair deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/219:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Thu 7/234:09 pm
STL
- SAT
1 stop16h 47m
Frontier
Deal found 6/11![Frontier logo]()
$273
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/256:01 am
SAT
- MLI
1 stop4h 38m
American Airlines
Sat 8/14:44 pm
MLI
- SAT
1 stop7h 14m
American Airlines
Deal found 6/15![American Airlines logo]()
$293
This CheapOair deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/279:51 am
SAT
- STL
1 stop14h 08m
Frontier
Thu 7/307:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 6/13![Frontier logo]()
$278
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 June 16, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This Super.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/119:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/13![Frontier logo]()
$104
This Super.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/14![Frontier logo]()
$114
This Frontier deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 6/15![Frontier logo]()
$115
This CheapOair deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:51 pm
SAT
- ORD
1 stop25h 44m
Frontier
Deal found 6/11![Frontier logo]()
$116
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/81:00 pm
SAT
- ORD
Nonstop3h 00m
United Airlines
Deal found 6/11![United Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/82:35 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/11![Southwest logo]()
$117
This Frontier deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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 9/1411:08 am
SAT
- STL
1 stop8h 07m
Frontier
Deal found 6/16![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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 8/139:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/16![Frontier logo]()
$123
This Super.com deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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 7/209:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/16![Frontier logo]()
$124
This Super.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/119:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/11![Frontier logo]()
$126
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:20 am
SAT
- ORD
1 stop7h 19m
Delta
Deal found 6/11![Delta logo]()
$127
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/511:29 am
SAT
- MDW
1 stop7h 04m
Delta
Deal found 6/11![Delta logo]()
$127
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 June 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $254 (CheapOair) |
One-way from | $104 (Super.com) |
Popular in | June |
Cheapest in | September |
Average price | $405 |
Good round-trip deal | $356 or less |
Good one-way deal | $250 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 June 16, 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 AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 8/20
7:51 pm-7:23 pm
1 stop23h 32m
Lambert-St Louis
Tue 8/25
6:58 pm-8:11 pm
1 stop25h 13m
$268
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Wed 9/9
9:25 am-12:00 pm
Nonstop2h 35m
Chicago Midway
Thu 9/10
8:35 pm-11:15 pm
Nonstop2h 40m
$305
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Sat 7/11
6:01 am-10:39 am
1 stop4h 38m
Moline Quad-City
Sat 7/18
11:28 am-6:02 pm
1 stop6h 34m
$306
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Wed 8/5
6:40 am-9:38 am
Nonstop2h 58m
Chicago O'Hare Intl
Wed 8/12
2:42 pm-8:52 pm
1 stop6h 10m
$307
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Thu 8/6
11:29 am-6:33 pm
1 stop7h 04m
Chicago Midway
Wed 9/23
1:00 pm-6:38 pm
1 stop5h 38m
$308
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Sat 9/26
5:30 am-11:23 am
1 stop5h 53m
Bloomington-Normal
Mon 9/28
4:23 pm-12:16 am
1 stop7h 53m
$309
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Wed 8/5
10:50 am-4:55 pm
1 stop6h 05m
Chicago Midway
Wed 9/23
1:55 pm-5:55 pm
1 stop4h 00m
$312
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Tue 9/1
6:30 am-1:10 pm
1 stop6h 40m
Chicago Midway
Tue 9/8
5:45 pm-10:46 pm
1 stop5h 01m
$317
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Fri 7/10
5:32 pm-11:16 pm
1 stop5h 44m
Moline Quad-City
Thu 7/16
3:47 pm-10:57 pm
1 stop7h 10m
$319
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Fri 8/28
2:43 pm-10:19 pm
1 stop7h 36m
Moline Quad-City
Sun 8/30
6:00 am-11:10 am
1 stop5h 10m
$319
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Antonio to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Antonio with our price prediction graph.
SAT-ORD
SAT-MDW
SAT-STL
SAT-MLI
SAT-RFD
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Antonio to Illinois
SAT-USIL
SAT-ORD
SAT-MDW
SAT-STL
SAT-MLI
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $96). Flying from San Antonio to Illinois in June is currently the most expensive (average of $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 June 16, 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 June 16, 2026.
The most flights from SAT to USIL are scheduled on a Monday (36 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 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 June 16, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest,Delta, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
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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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 June 16, 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 June 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$211 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$235 | Average$434 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$413 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$287 | Average$444 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$323 | FlexibilityNo cancel fee | On-timeN/A |