$105+ Cheap flights from San Antonio (SAT) to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jul 11 — Jul 181
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from San Antonio to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from San Antonio to Illinois
Cheapest
Best
Last-minute
One-way
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 11, 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 11, 2026.
This Frontier deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Mon 7/68:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/8![Frontier logo]()
$264
This Mytrip deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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.
Sat 7/184:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Tue 7/218:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/6![Frontier logo]()
$267
This CheapOair deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/147:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Tue 7/218:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/9![Frontier logo]()
$268
This Booking.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Tue 7/147:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/9![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 6/10![Frontier logo]()
$273
This CheapOair deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/153:10 pm
SAT
- STL
1 stop28h 05m
Frontier
Mon 10/198:10 pm
STL
- SAT
1 stop15h 11m
Frontier
Deal found 6/9![Frontier logo]()
$277
This Booking.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/97:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Thu 7/167:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 6/10![Frontier logo]()
$280
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/301:20 pm
SAT
- ORD
Nonstop3h 02m
United Airlines
Sat 7/47:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 6/9![United Airlines logo]()
$305
This Southwest deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/302:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Sat 7/410:15 am
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/9![Southwest logo]()
$305
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:35 pm
SAT
- CMI
1 stop4h 24m
American Airlines
Wed 7/226:36 pm
CMI
- SAT
1 stop5h 34m
American Airlines
Deal found 6/10![American Airlines logo]()
$306
This Frontier deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:08 am
SAT
- STL
1 stop8h 07m
Frontier
Thu 9/178:34 pm
STL
- SAT
1 stop12h 28m
Frontier
Deal found 6/9![Frontier logo]()
$308
This Priceline deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:56 pm
SAT
- ORD
1 stop8h 11m
Frontier
Sat 7/47:20 am
ORD
- SAT
1 stop12h 51m
Frontier
Deal found 6/9![Frontier logo]()
$308
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 11, 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 11, 2026.
This American Airlines deal was found by Cheapflights users on 6/5. 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 7/316:57 pm
SAT
- BMI
1 stop5h 38m
American Airlines
Mon 8/35:45 pm
BMI
- SAT
1 stop6h 25m
American Airlines
Deal found 6/5![American Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/87:20 am
SAT
- STL
Nonstop2h 05m
Southwest
Tue 8/118:40 am
STL
- SAT
Nonstop2h 10m
Southwest
Deal found 6/10![Southwest logo]()
$310
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/412:05 pm
SAT
- MLI
1 stop8h 04m
Delta
Fri 7/105:05 pm
MLI
- SAT
1 stop5h 14m
Delta
Deal found 6/9![Delta logo]()
$311
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:40 am
SAT
- PIA
1 stop5h 58m
United Airlines
Sat 7/255:43 pm
PIA
- SAT
1 stop5h 14m
United Airlines
Deal found 6/10![United Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/159:32 pm
SAT
- RFD
1 stop14h 52m
Multiple Airlines
Wed 7/298:49 pm
RFD
- SAT
2 stops21h 55m
Multiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$458
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:55 am
SAT
- STL
1 stop6h 38m
Delta
Tue 8/256:00 am
STL
- SAT
1 stop7h 38m
Delta
Deal found 6/10![Delta logo]()
$315
This American Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/56:57 pm
SAT
- BMI
1 stop5h 38m
American Airlines
Sat 7/114:30 pm
BMI
- SAT
1 stop5h 30m
American Airlines
Deal found 6/9![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:18 pm
SAT
- ORD
1 stop5h 22m
United Airlines
Wed 7/85:45 pm
ORD
- SAT
1 stop4h 57m
United Airlines
Deal found 6/10![United Airlines logo]()
$325
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/283:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Mon 8/3110:10 am
MDW
- SAT
2 stops6h 50m
Southwest
Deal found 6/10![Southwest logo]()
$347
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/285:20 am
SAT
- STL
1 stop6h 57m
Delta
Wed 8/53:39 pm
STL
- SAT
1 stop5h 25m
Delta
Deal found 6/9![Delta logo]()
$327
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:38 pm
SAT
- ORD
1 stop4h 45m
United Airlines
Mon 9/285:53 pm
ORD
- SAT
1 stop4h 58m
United Airlines
Deal found 6/9![United Airlines logo]()
$328
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/132:48 pm
SAT
- CMI
1 stop7h 11m
American Airlines
Sat 7/256:34 pm
CMI
- SAT
1 stop5h 25m
American Airlines
Deal found 6/10![American Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/131:50 pm
SAT
- MDW
2 stops6h 35m
Southwest
Tue 7/149:00 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 6/10![Southwest logo]()
$351
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/32:43 pm
SAT
- MLI
1 stop7h 36m
Delta
Sun 9/66:00 am
MLI
- SAT
1 stop7h 38m
Delta
Deal found 6/9![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:35 am
SAT
- ORD
Nonstop3h 00m
United Airlines
Fri 10/91:30 pm
ORD
- SAT
Nonstop3h 01m
United Airlines
Deal found 6/10![United Airlines logo]()
$333
This American Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 6/9![American Airlines logo]()
$345
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/242:40 pm
SAT
- MLI
1 stop7h 54m
Delta
Wed 7/155:05 pm
MLI
- SAT
1 stop7h 15m
Delta
Deal found 6/7![Delta logo]()
$333
This Southwest deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/292:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Tue 8/48:30 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/6![Southwest logo]()
$367
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/71:25 pm
SAT
- ORD
Nonstop3h 02m
United Airlines
Thu 7/97:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 6/9![United Airlines logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:56 pm
SAT
- RFD
1 stop23h 49m
Multiple Airlines
Sun 8/239:35 pm
RFD
- SAT
1 stop22h 36m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$470
This American Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/56:57 pm
SAT
- PIA
1 stop5h 25m
American Airlines
Sat 7/119:50 am
PIA
- SAT
2 stops7h 54m
American Airlines
Deal found 6/7![American Airlines logo]()
$366
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/282:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Tue 7/289:00 pm
MDW
- SAT
Nonstop2h 45m
Southwest
Deal found 6/7![Southwest logo]()
$367
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/45:15 am
SAT
- MDW
1 stop7h 24m
Delta
Tue 9/86:00 am
MDW
- SAT
1 stop5h 10m
Delta
Deal found 6/9![Delta logo]()
$339
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/306:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Tue 7/75:45 pm
ORD
- SAT
1 stop4h 57m
United Airlines
Deal found 6/7![United Airlines logo]()
$346
This Kiwi.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/217:39 pm
SAT
- RFD
2 stops24h 20m
Multiple Airlines
Fri 7/247:50 pm
RFD
- SAT
1 stop19h 51m
Multiple Airlines
Deal found 6/9![Multiple Airlines logo]()
$475
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/159:55 am
SAT
- CMI
2 stops8h 11m
American Airlines
Wed 7/226:36 pm
CMI
- SAT
1 stop5h 34m
American Airlines
Deal found 6/10![American Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/112:35 pm
SAT
- MDW
1 stop6h 10m
Southwest
Fri 8/1410:10 am
MDW
- SAT
2 stops6h 50m
Southwest
Deal found 6/8![Southwest logo]()
$375
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 8/125:27 pm
SAT
- ORD
Nonstop3h 00m
United Airlines
Sat 8/151:30 pm
ORD
- SAT
Nonstop3h 01m
United Airlines
Deal found 6/6![United Airlines logo]()
$367
This American Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 6/136:32 pm
SAT
- BMI
1 stop5h 36m
American Airlines
Sat 6/204:22 pm
BMI
- SAT
1 stop4h 44m
American Airlines
Deal found 6/6![American Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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
Sun 8/21:14 pm
RFD
- SAT
1 stop31h 23m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$496
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated June 11, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated June 11, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/302:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Sat 7/410:15 am
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 6/9![Southwest logo]()
$305
This Frontier deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Mon 7/68:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/8![Frontier logo]()
$264
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/412:05 pm
SAT
- MLI
1 stop8h 04m
Delta
Fri 7/105:05 pm
MLI
- SAT
1 stop5h 14m
Delta
Deal found 6/9![Delta logo]()
$311
This Booking.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:32 pm
SAT
- STL
1 stop20h 33m
Frontier
Tue 7/147:03 pm
STL
- SAT
1 stop25h 34m
Frontier
Deal found 6/9![Frontier logo]()
$270
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/82:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Tue 8/44:40 pm
MDW
- SAT
1 stop6h 15m
Southwest
Deal found 6/8![Southwest logo]()
$310
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/82:35 pm
SAT
- MDW
1 stop7h 40m
Delta
Tue 8/410:54 am
MDW
- SAT
1 stop7h 52m
Delta
Deal found 6/8![Delta logo]()
$319
This Booking.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/97:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Thu 7/167:10 pm
STL
- SAT
1 stop25h 27m
Frontier
Deal found 6/10![Frontier logo]()
$280
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/96:40 am
SAT
- PIA
1 stop5h 58m
United Airlines
Wed 7/152:33 pm
PIA
- SAT
1 stop8h 24m
United Airlines
Deal found 6/10![United Airlines logo]()
$319
This CheapOair deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/147:39 pm
SAT
- STL
1 stop23h 44m
Frontier
Tue 7/218:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/9![Frontier logo]()
$268
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:35 pm
SAT
- CMI
1 stop4h 24m
American Airlines
Wed 7/226:36 pm
CMI
- SAT
1 stop5h 34m
American Airlines
Deal found 6/10![American Airlines logo]()
$306
This Mytrip deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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.
Sat 7/184:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Tue 7/218:08 pm
STL
- SAT
1 stop22h 36m
Frontier
Deal found 6/6![Frontier logo]()
$267
This CheapOair deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 6/10![Frontier 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 June 11, 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 11, 2026.
This Frontier deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/49:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/10![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/10![Frontier logo]()
$114
This Priceline deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline 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 6/10![Frontier logo]()
$115
This American Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:24 am
SAT
- ORD
Nonstop3h 05m
American Airlines
Deal found 6/9![American Airlines logo]()
$116
This Southwest deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/42:35 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 6/9![Southwest logo]()
$117
This Trip.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com 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 6/8![Frontier logo]()
$119
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/57:10 am
SAT
- STL
Nonstop2h 05m
Southwest
Deal found 6/8![Southwest logo]()
$126
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/412:05 pm
SAT
- ORD
1 stop8h 50m
Delta
Deal found 6/9![Delta logo]()
$126
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/45:20 am
SAT
- MDW
1 stop6h 31m
Delta
Deal found 6/8![Delta logo]()
$126
This Frontier deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Deal found 6/9![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/48:56 pm
SAT
- ORD
1 stop8h 11m
Frontier
Deal found 6/10![Frontier logo]()
$129
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/279:32 pm
SAT
- ORD
1 stop8h 05m
Frontier
Deal found 6/7![Frontier logo]()
$131
Find flight deals from San Antonio to Illinois
Keep the following information in mind while searching for San Antonio to Illinois flight deals. Data was last updated June 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $264 (Frontier) |
One-way from | $105 (Frontier) |
Popular in | June |
Cheapest in | September |
Average price | $404 |
Good round-trip deal | $356 or less |
Good one-way deal | $208 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 11, 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 AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Fri 7/31
6:57 pm-12:35 am
1 stop5h 38m
Bloomington-Normal
Mon 8/3
5:45 pm-12:10 am
1 stop6h 25m
$309
Quickest round-trip
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Sat 8/8
7:20 am-9:25 am
Nonstop2h 05m
Lambert-St Louis
Tue 8/11
8:40 am-10:50 am
Nonstop2h 10m
$310
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Sat 7/4
12:05 pm-8:09 pm
1 stop8h 04m
Moline Quad-City
Fri 7/10
5:05 pm-10:19 pm
1 stop5h 14m
$311
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 8/20
7:55 am-2:33 pm
1 stop6h 38m
Lambert-St Louis
Tue 8/25
6:00 am-1:38 pm
1 stop7h 38m
$315
San AntonioPeoria
SAT - PIA
SATPIA
San Antonio
Sat 7/18
6:40 am-12:38 pm
1 stop5h 58m
Greater Peoria
Sat 7/25
5:43 pm-10:57 pm
1 stop5h 14m
$319
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Sun 7/5
6:57 pm-12:35 am
1 stop5h 38m
Bloomington-Normal
Sat 7/11
4:30 pm-10:00 pm
1 stop5h 30m
$319
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Sat 7/4
4:18 pm-9:40 pm
1 stop5h 22m
Chicago O'Hare Intl
Wed 7/8
5:45 pm-10:42 pm
1 stop4h 57m
$325
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Tue 7/28
5:20 am-12:17 pm
1 stop6h 57m
Lambert-St Louis
Wed 8/5
3:39 pm-9:04 pm
1 stop5h 25m
$327
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Fri 9/25
7:38 pm-12:23 am
1 stop4h 45m
Chicago O'Hare Intl
Mon 9/28
5:53 pm-10:51 pm
1 stop4h 58m
$328
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Thu 9/3
2:43 pm-10:19 pm
1 stop7h 36m
Moline Quad-City
Sun 9/6
6:00 am-1:38 pm
1 stop7h 38m
$329
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-BMI
SAT-STL
SAT-MLI
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-BMI
SAT-STL
SAT-MLI
SAT-PIA
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 11, 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 11, 2026.
The most flights from SAT to USIL are scheduled on a Tuesday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 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 11, 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.
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for San Antonio to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from San Antonio to Illinois by cabin class
Find flights from San Antonio to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on June 11, 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 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$211 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$235 | Average$435 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$407 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$277 | Average$440 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$323 | FlexibilityNo cancel fee | On-timeN/A |