$95+ 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
Jun 20 — Jun 271
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 May 21, 2026.
Explore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 21, 2026.
This Frontier deal was found by Cheapflights users on 5/16. 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.
Thu 6/118:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Mon 6/152:56 pm
STL
- SAT
1 stop29h 15m
Frontier
Deal found 5/16![Frontier logo]()
$227
This Booking.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/118:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Sat 6/137:38 pm
STL
- SAT
1 stop23h 18m
Frontier
Deal found 5/18![Frontier logo]()
$235
This Booking.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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 7/98:59 pm
SAT
- STL
1 stop17h 08m
Frontier
Mon 7/132:52 pm
STL
- SAT
1 stop29h 22m
Frontier
Deal found 5/18![Frontier logo]()
$240
This Trip.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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 7/28:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Mon 7/68:08 pm
STL
- SAT
1 stop22h 46m
Frontier
Deal found 5/18![Frontier logo]()
$249
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/242:40 pm
SAT
- MLI
1 stop7h 54m
Delta
Wed 7/155:56 am
MLI
- SAT
1 stop7h 36m
Delta
Deal found 5/18![Delta logo]()
$263
This Mytrip deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/167:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Tue 6/238:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/19![Frontier logo]()
$267
This Booking.com deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/107:51 pm
SAT
- STL
1 stop23h 02m
Frontier
Tue 6/238:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/20![Frontier logo]()
$270
This Booking.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” 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 6/134:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Sat 6/207:38 pm
STL
- SAT
1 stop23h 18m
Frontier
Deal found 5/19![Frontier logo]()
$275
This CheapOair deal was found by Cheapflights users on 5/16. 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.
Fri 7/177:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Mon 7/202:52 pm
STL
- SAT
1 stop29h 22m
Frontier
Deal found 5/16![Frontier logo]()
$278
This American Airlines deal was found by Cheapflights users on 5/16. 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.
Mon 6/156:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Sat 6/206:52 pm
MLI
- SAT
1 stop5h 33m
American Airlines
Deal found 5/16![American Airlines logo]()
$291
This Frontier deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 7/108:59 pm
SAT
- ORD
1 stop8h 29m
Frontier
Fri 7/177:15 am
ORD
- SAT
1 stop12h 59m
Frontier
Deal found 5/17![Frontier logo]()
$300
This Mytrip deal was found by Cheapflights users on 5/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/308:56 pm
SAT
- ORD
1 stop8h 11m
Frontier
Tue 7/79:57 pm
ORD
- SAT
1 stop20h 57m
Frontier
Deal found 5/16![Frontier logo]()
$303
Best flights from San Antonio to IllinoisDiscover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 21, 2026.
Discover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 21, 2026.
This Delta deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/242:40 pm
SAT
- MLI
1 stop7h 54m
Delta
Wed 7/155:56 am
MLI
- SAT
1 stop7h 36m
Delta
Deal found 5/20![Delta logo]()
$263
This American Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/168:00 am
SAT
- MLI
1 stop7h 59m
American Airlines
Tue 6/236:52 pm
MLI
- SAT
1 stop5h 07m
American Airlines
Deal found 5/19![American Airlines logo]()
$291
This United Airlines deal was found by Cheapflights users on 5/16. 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 7/285:30 am
SAT
- ORD
1 stop4h 50m
United Airlines
Tue 7/287:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/16![United Airlines logo]()
$315
This Southwest deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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 6/173:35 pm
SAT
- MDW
1 stop7h 00m
Southwest
Wed 6/245:20 pm
MDW
- SAT
1 stop6h 35m
Southwest
Deal found 5/20![Southwest logo]()
$325
This Kiwi.com deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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 7/169:55 am
SAT
- ORD
2 stops21h 58m
Multiple Airlines
Thu 7/237:45 am
ORD
- SAT
1 stop26h 04m
Multiple Airlines
Deal found 5/20![Multiple Airlines logo]()
$437
This American Airlines deal was found by Cheapflights users on 5/16. 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.
Mon 6/156:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Sat 6/206:52 pm
MLI
- SAT
1 stop5h 33m
American Airlines
Deal found 5/16![American Airlines logo]()
$291
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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 7/75:00 pm
SAT
- ORD
1 stop6h 53m
Delta
Wed 7/89:45 am
ORD
- SAT
1 stop5h 25m
Delta
Deal found 5/18![Delta logo]()
$325
This United Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” 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 7/165:57 pm
SAT
- ORD
1 stop6h 48m
United Airlines
Wed 7/221:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/19![United Airlines logo]()
$346
This Southwest deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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 6/232:00 pm
SAT
- MDW
Nonstop2h 40m
Southwest
Mon 6/296:40 pm
MDW
- SAT
1 stop6h 20m
Southwest
Deal found 5/20![Southwest logo]()
$346
This Delta deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 6/2411:30 am
SAT
- MDW
1 stop7h 01m
Delta
Wed 7/159:49 am
MDW
- SAT
1 stop7h 22m
Delta
Deal found 5/17![Delta logo]()
$325
This American Airlines deal was found by Cheapflights users on 5/21. Clicking the “Pick Dates” 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 6/67:08 pm
SAT
- MLI
1 stop4h 22m
American Airlines
Mon 6/156:52 pm
MLI
- SAT
1 stop5h 07m
American Airlines
Deal found 5/21![American Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 7/214:18 pm
SAT
- ORD
1 stop5h 22m
United Airlines
Sat 7/257:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/17![United Airlines logo]()
$346
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/912:50 pm
SAT
- MDW
2 stops6h 00m
Southwest
Wed 7/159:00 am
MDW
- SAT
1 stop6h 20m
Southwest
Deal found 5/18![Southwest logo]()
$361
This Delta deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:00 pm
SAT
- BMI
1 stop5h 30m
Delta
Tue 6/94:19 pm
BMI
- SAT
1 stop8h 14m
Delta
Deal found 5/20![Delta logo]()
$339
This United Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:30 am
SAT
- ORD
1 stop5h 53m
United Airlines
Fri 6/191:30 pm
ORD
- SAT
Nonstop3h 00m
United Airlines
Deal found 5/20![United Airlines logo]()
$366
This Southwest deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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 8/611:10 am
SAT
- MDW
2 stops5h 45m
Southwest
Mon 8/104:45 pm
MDW
- SAT
1 stop5h 40m
Southwest
Deal found 5/20![Southwest logo]()
$374
This Delta deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 6/254:15 pm
SAT
- MDW
1 stop6h 02m
Delta
Tue 6/306:00 am
MDW
- SAT
1 stop7h 35m
Delta
Deal found 5/17![Delta logo]()
$356
This American Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 6/146:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Sun 6/214:45 pm
MLI
- SAT
1 stop6h 20m
American Airlines
Deal found 5/17![American Airlines logo]()
$398
This United Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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 7/166:40 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Thu 7/231:30 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/20![United Airlines logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” 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 7/29:55 am
SAT
- EVV
2 stops21h 48m
Multiple Airlines
Sun 7/58:16 pm
EVV
- SAT
1 stop12h 40m
Multiple Airlines
Deal found 5/19![Multiple Airlines logo]()
$500
This Southwest deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” 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 7/207:05 am
SAT
- MDW
1 stop6h 40m
Southwest
Thu 7/239:25 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/19![Southwest logo]()
$377
This American Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/115:52 pm
SAT
- PIA
1 stop6h 06m
American Airlines
Wed 6/174:47 pm
PIA
- SAT
1 stop4h 19m
American Airlines
Deal found 5/20![American Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/172:40 pm
SAT
- MDW
1 stop7h 35m
Delta
Tue 7/211:49 pm
MDW
- SAT
1 stop7h 37m
Delta
Deal found 5/20![Delta logo]()
$376
This Southwest deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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 8/73:30 pm
SAT
- MDW
1 stop3h 50m
Southwest
Tue 8/1110:30 am
MDW
- SAT
2 stops6h 20m
Southwest
Deal found 5/20![Southwest logo]()
$377
This United Airlines deal was found by Cheapflights users on 5/16. 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.
Fri 7/245:57 pm
SAT
- ORD
1 stop5h 18m
United Airlines
Mon 7/277:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 5/16![United Airlines logo]()
$397
This Southwest deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 6/295:40 am
SAT
- MDW
2 stops6h 30m
Southwest
Mon 6/299:25 pm
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 5/17![Southwest logo]()
$382
This Kiwi.com deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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 6/248:56 pm
SAT
- RFD
1 stop15h 27m
Multiple Airlines
Mon 6/297:48 pm
RFD
- SAT
2 stops23h 08m
Multiple Airlines
Deal found 5/20![Multiple Airlines logo]()
$567
This American Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/52:45 pm
SAT
- CMI
1 stop6h 22m
American Airlines
Tue 6/96:43 pm
CMI
- SAT
1 stop5h 16m
American Airlines
Deal found 5/20![American Airlines logo]()
$436
This United Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/86:40 am
SAT
- PIA
1 stop5h 58m
United Airlines
Sat 8/158:29 am
PIA
- SAT
1 stop8h 02m
United Airlines
Deal found 5/17![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 6/297:40 am
SAT
- ORD
1 stop6h 36m
Delta
Mon 6/296:22 pm
ORD
- SAT
1 stop6h 11m
Delta
Deal found 5/17![Delta logo]()
$427
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated May 21, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated May 21, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/16. 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.
Fri 5/297:54 pm
SAT
- ORD
1 stop24h 38m
Frontier
Sun 5/319:37 pm
ORD
- SAT
1 stop21h 22m
Frontier
Deal found 5/16![Frontier logo]()
$300
This Booking.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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.
Mon 6/88:59 pm
SAT
- STL
1 stop20h 06m
Frontier
Mon 6/222:56 pm
STL
- SAT
1 stop29h 15m
Frontier
Deal found 5/17![Frontier logo]()
$285
This Frontier deal was found by Cheapflights users on 5/16. 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.
Thu 6/118:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Mon 6/152:56 pm
STL
- SAT
1 stop29h 15m
Frontier
Deal found 5/16![Frontier logo]()
$227
This Booking.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/118:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Sat 6/137:38 pm
STL
- SAT
1 stop23h 18m
Frontier
Deal found 5/18![Frontier logo]()
$235
This Booking.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” 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 6/134:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Sat 6/207:38 pm
STL
- SAT
1 stop23h 18m
Frontier
Deal found 5/19![Frontier logo]()
$275
This American Airlines deal was found by Cheapflights users on 5/16. 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.
Mon 6/156:24 pm
SAT
- MLI
1 stop5h 47m
American Airlines
Sat 6/206:52 pm
MLI
- SAT
1 stop5h 33m
American Airlines
Deal found 5/16![American Airlines logo]()
$291
This Mytrip deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/167:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Tue 6/238:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/19![Frontier logo]()
$267
This Booking.com deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/178:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Wed 6/248:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/20![Frontier logo]()
$270
This Booking.com deal was found by Cheapflights users on 5/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/198:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Tue 6/238:08 pm
STL
- SAT
1 stop22h 48m
Frontier
Deal found 5/16![Frontier logo]()
$286
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/242:40 pm
SAT
- MLI
1 stop7h 54m
Delta
Wed 7/155:56 am
MLI
- SAT
1 stop7h 36m
Delta
Deal found 5/18![Delta logo]()
$263
This American Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/242:10 pm
SAT
- ORD
Nonstop3h 02m
American Airlines
Tue 6/309:00 pm
ORD
- SAT
Nonstop2h 59m
American Airlines
Deal found 5/19![American Airlines logo]()
$304
This Mytrip deal was found by Cheapflights users on 5/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/308:56 pm
SAT
- ORD
1 stop8h 11m
Frontier
Tue 7/79:57 pm
ORD
- SAT
1 stop20h 57m
Frontier
Deal found 5/16![Frontier logo]()
$303
One-way flights from San Antonio to IllinoisSearch for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated May 21, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated May 21, 2026.
This Priceline deal was found by Cheapflights users on 5/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/118:59 pm
SAT
- ORD
1 stop8h 29m
Frontier
Deal found 5/16![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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 6/177:51 pm
SAT
- ORD
1 stop24h 52m
Frontier
Deal found 5/18![Frontier logo]()
$100
This Frontier deal was found by Cheapflights users on 5/16. 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.
Sat 6/134:22 pm
SAT
- STL
1 stop7h 27m
Frontier
Deal found 5/16![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 5/16. 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.
Sat 7/118:59 pm
SAT
- ORD
1 stop8h 29m
Frontier
Deal found 5/16![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 7/134:26 pm
SAT
- STL
1 stop7h 33m
Frontier
Deal found 5/17![Frontier logo]()
$114
This Frontier deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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 7/98:59 pm
SAT
- ORD
1 stop8h 29m
Frontier
Deal found 5/18![Frontier logo]()
$114
This Priceline deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 7/108:59 pm
SAT
- ORD
1 stop8h 29m
Frontier
Deal found 5/17![Frontier logo]()
$115
This Trip.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” 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 7/68:59 pm
SAT
- ORD
1 stop8h 29m
Frontier
Deal found 5/19![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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.
Fri 6/127:51 pm
SAT
- ORD
1 stop24h 52m
Frontier
Deal found 5/18![Frontier logo]()
$120
This Trip.com deal was found by Cheapflights users on 5/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/118:56 pm
SAT
- STL
1 stop17h 10m
Frontier
Deal found 5/16![Frontier logo]()
$121
This Orbitz deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/147:51 pm
SAT
- ORD
1 stop25h 01m
Frontier
Deal found 5/18![Frontier logo]()
$121
This Trip.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” 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 7/98:59 pm
SAT
- STL
1 stop17h 08m
Frontier
Deal found 5/17![Frontier logo]()
$122
Find flight deals from San Antonio to Illinois
Keep the following information in mind while searching for San Antonio to Illinois flight deals. Data was last updated May 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $227 (Frontier) |
One-way from | $95 (Frontier) |
Popular in | December |
Cheapest in | September |
Average price | $389 |
Good round-trip deal | $336 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 May 21, 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 AntonioMoline
SAT - MLI
SATMLI
San Antonio
Wed 6/24
2:40 pm-10:34 pm
1 stop7h 54m
Moline Quad-City
Wed 7/15
5:56 am-1:32 pm
1 stop7h 36m
$263
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Tue 6/16
8:00 am-3:59 pm
1 stop7h 59m
Moline Quad-City
Tue 6/23
6:52 pm-11:59 pm
1 stop5h 07m
$291
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Mon 6/15
6:24 pm-12:11 am
1 stop5h 47m
Moline Quad-City
Sat 6/20
6:52 pm-12:25 am
1 stop5h 33m
$291
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Tue 7/28
5:30 am-10:20 am
1 stop4h 50m
Chicago O'Hare Intl
Tue 7/28
7:58 pm-10:57 pm
Nonstop2h 59m
$315
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Wed 6/17
3:35 pm-10:35 pm
1 stop7h 00m
Chicago Midway
Wed 6/24
5:20 pm-11:55 pm
1 stop6h 35m
$325
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Tue 7/7
5:00 pm-11:53 pm
1 stop6h 53m
Chicago O'Hare Intl
Wed 7/8
9:45 am-3:10 pm
1 stop5h 25m
$325
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Wed 6/24
11:30 am-6:31 pm
1 stop7h 01m
Chicago Midway
Wed 7/15
9:49 am-5:11 pm
1 stop7h 22m
$325
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Sat 6/6
5:00 pm-10:30 pm
1 stop5h 30m
Bloomington-Normal
Tue 6/9
4:19 pm-12:33 am
1 stop8h 14m
$339
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Sat 6/6
7:08 pm-11:30 pm
1 stop4h 22m
Moline Quad-City
Mon 6/15
6:52 pm-11:59 pm
1 stop5h 07m
$344
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Thu 7/16
5:57 pm-12:45 am
1 stop6h 48m
Chicago O'Hare Intl
Wed 7/22
1:30 pm-4:29 pm
Nonstop2h 59m
$346
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-STL
SAT-MLI
SAT-MDW
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-STL
SAT-MLI
SAT-MDW
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $96). Flying from San Antonio to Illinois in June is currently the most expensive (average of $218). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SAT to IL?
Find hourly flight availability from San Antonio to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 21, 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.
How much does it cost to fly round-trip from San Antonio to Illinois?
How far ahead should I book a flight from San Antonio to Illinois?
Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Antonio to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated May 21, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest,United Airlines, andAmerican Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
7.9
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Related info for your journey
Find useful and relevant information for your journey from San Antonio to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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 May 21, 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 6 airlines flying from San Antonio to Illinois
Discover the top 6 airlines that operate flights from San Antonio to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$213 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$247 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$235 | Average$435 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$406 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$265 | Average$432 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$328 | FlexibilityNo cancel fee | On-timeN/A |