$86+ Cheap flights from Illinois to San Antonio (SAT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Apr 10 — Apr 171
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Illinois to San Antonio 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 Illinois to San Antonio
Cheapest
Best
Last-minute
One-way
Cheapest flights from Illinois to San AntonioExplore the most affordable flight options available from Illinois to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 11, 2026.
Explore the most affordable flight options available from Illinois to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 11, 2026.
This Expedia deal was found by Cheapflights users on 3/8. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/79:55 pm
STL
- SAT
1 stop13h 45m
Frontier
Sun 5/103:14 pm
SAT
- STL
1 stop27h 58m
Frontier
Deal found 3/8![Frontier logo]()
$160
This CheapOair deal was found by Cheapflights users on 3/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/88:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Fri 4/106:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/8![Frontier logo]()
$171
This CheapOair deal was found by Cheapflights users on 3/9. 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.
Fri 4/108:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Fri 4/173:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Deal found 3/9![Frontier logo]()
$191
This CheapOair deal was found by Cheapflights users on 3/9. 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.
Fri 5/154:55 pm
STL
- SAT
1 stop25h 04m
Frontier
Mon 5/1810:23 am
SAT
- STL
1 stop12h 56m
Frontier
Deal found 3/9![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:29 pm
STL
- SAT
1 stop22h 36m
Frontier
Thu 4/96:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/6![Frontier logo]()
$194
This CheapOair deal was found by Cheapflights users on 3/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/510:12 pm
STL
- SAT
1 stop12h 31m
Frontier
Sun 4/126:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/6![Frontier logo]()
$206
This CheapOair deal was found by Cheapflights users on 3/10. 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.
Fri 4/108:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Sun 4/126:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/10![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2611:21 am
STL
- SAT
2 stops22h 06m
Multiple Airlines
Sun 4/56:45 am
SAT
- STL
1 stop27h 03m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$215
This American Airlines deal was found by Cheapflights users on 3/7. 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.
Sat 4/45:12 am
STL
- SAT
1 stop5h 46m
American Airlines
Sat 4/115:00 am
SAT
- STL
1 stop3h 54m
American Airlines
Deal found 3/7![American Airlines logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/294:51 pm
STL
- SAT
1 stop19h 36m
Multiple Airlines
Sun 4/56:45 am
SAT
- STL
1 stop27h 03m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$219
This Expedia deal was found by Cheapflights users on 3/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2512:35 pm
ORD
- SAT
1 stop22h 05m
Multiple Airlines
Wed 4/810:22 am
SAT
- ORD
1 stop9h 29m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$280
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/21:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Mon 5/46:31 pm
SAT
- ORD
2 stops15h 52m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$281
Best flights from Illinois to San AntonioDiscover carefully curated flight deals from Illinois to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
Discover carefully curated flight deals from Illinois to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
This Delta deal was found by Cheapflights users on 3/8. 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.
Thu 7/21:30 pm
STL
- SAT
1 stop6h 47m
Delta
Sun 7/56:45 am
SAT
- STL
1 stop6h 09m
Delta
Deal found 3/8![Delta logo]()
$271
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/189:23 am
STL
- SAT
1 stop6h 40m
United Airlines
Mon 6/296:40 am
SAT
- STL
1 stop5h 31m
United Airlines
Deal found 3/8![United Airlines logo]()
$275
This Southwest deal was found by Cheapflights users on 3/9. 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.
Sun 4/195:35 am
STL
- SAT
1 stop6h 30m
Southwest
Wed 4/229:40 am
SAT
- STL
1 stop5h 10m
Southwest
Deal found 3/9![Southwest logo]()
$287
This American Airlines deal was found by Cheapflights users on 3/6. 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.
Thu 6/46:00 am
PIA
- SAT
1 stop6h 45m
American Airlines
Mon 6/85:35 pm
SAT
- PIA
1 stop6h 03m
American Airlines
Deal found 3/6![American Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 3/8. 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 4/76:00 am
STL
- SAT
1 stop6h 42m
Delta
Fri 4/106:17 pm
SAT
- STL
1 stop5h 41m
Delta
Deal found 3/8![Delta logo]()
$271
This United Airlines deal was found by Cheapflights users on 3/10. 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.
Wed 4/86:00 am
STL
- SAT
1 stop4h 50m
United Airlines
Thu 4/94:17 pm
SAT
- STL
1 stop6h 11m
United Airlines
Deal found 3/10![United Airlines logo]()
$290
This American Airlines deal was found by Cheapflights users on 3/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/62:56 pm
BMI
- SAT
2 stops7h 59m
American Airlines
Sat 4/113:11 pm
SAT
- BMI
2 stops8h 41m
American Airlines
Deal found 3/8![American Airlines logo]()
$300
This Delta deal was found by Cheapflights users on 3/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/315:21 pm
STL
- SAT
1 stop7h 17m
Delta
Fri 4/312:34 pm
SAT
- STL
1 stop5h 19m
Delta
Deal found 3/6![Delta logo]()
$279
This Southwest deal was found by Cheapflights users on 3/9. 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.
Fri 4/107:15 pm
STL
- SAT
1 stop3h 45m
Southwest
Fri 4/177:20 am
SAT
- STL
Nonstop2h 10m
Southwest
Deal found 3/9![Southwest logo]()
$309
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/129:41 am
BMI
- SAT
2 stops9h 59m
United Airlines
Sat 5/166:49 am
SAT
- BMI
1 stop6h 02m
United Airlines
Deal found 3/8![United Airlines logo]()
$294
This Southwest deal was found by Cheapflights users on 3/6. 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.
Mon 4/209:45 pm
STL
- SAT
Nonstop2h 20m
Southwest
Fri 4/244:30 pm
SAT
- STL
1 stop6h 55m
Southwest
Deal found 3/6![Southwest logo]()
$313
This Delta deal was found by Cheapflights users on 3/7. 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.
Sat 4/1112:02 pm
BMI
- SAT
1 stop6h 49m
Delta
Sat 4/184:20 pm
SAT
- BMI
1 stop6h 01m
Delta
Deal found 3/7![Delta logo]()
$289
This American Airlines deal was found by Cheapflights users on 3/10. 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.
Sat 4/112:46 pm
BMI
- SAT
2 stops9h 10m
American Airlines
Sat 4/185:00 am
SAT
- BMI
2 stops9h 16m
American Airlines
Deal found 3/10![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 3/7. 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.
Wed 3/258:17 am
STL
- SAT
2 stops7h 16m
United Airlines
Sat 3/289:52 am
SAT
- STL
1 stop6h 13m
United Airlines
Deal found 3/7![United Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 3/6. 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.
Thu 4/29:45 pm
STL
- SAT
Nonstop2h 25m
Southwest
Thu 4/95:45 pm
SAT
- STL
1 stop5h 55m
Southwest
Deal found 3/6![Southwest logo]()
$313
This Delta deal was found by Cheapflights users on 3/8. 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.
Fri 4/104:04 pm
BMI
- SAT
1 stop6h 26m
Delta
Sat 4/185:20 am
SAT
- BMI
1 stop5h 59m
Delta
Deal found 3/8![Delta logo]()
$289
This United Airlines deal was found by Cheapflights users on 3/7. 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.
Fri 4/171:55 pm
MLI
- SAT
2 stops9h 04m
United Airlines
Mon 4/206:49 am
SAT
- MLI
1 stop5h 38m
United Airlines
Deal found 3/7![United Airlines logo]()
$304
This Southwest deal was found by Cheapflights users on 3/10. 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.
Thu 4/99:45 pm
STL
- SAT
Nonstop2h 20m
Southwest
Thu 4/165:45 pm
SAT
- STL
1 stop5h 55m
Southwest
Deal found 3/10![Southwest logo]()
$315
This Delta deal was found by Cheapflights users on 3/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:01 am
BMI
- SAT
1 stop5h 09m
Delta
Sun 8/164:25 pm
SAT
- BMI
1 stop5h 57m
Delta
Deal found 3/6![Delta logo]()
$289
This American Airlines deal was found by Cheapflights users on 3/7. 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.
Sat 5/235:30 pm
EVV
- SAT
1 stop5h 36m
American Airlines
Tue 5/266:35 pm
SAT
- EVV
1 stop5h 24m
American Airlines
Deal found 3/7![American Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 3/6. 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.
Tue 9/11:33 pm
MLI
- SAT
2 stops9h 05m
United Airlines
Sat 9/51:45 pm
SAT
- MLI
1 stop7h 18m
United Airlines
Deal found 3/6![United Airlines logo]()
$304
This Southwest deal was found by Cheapflights users on 3/6. 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.
Tue 4/2110:10 am
MDW
- SAT
2 stops6h 05m
Southwest
Sat 4/255:05 am
SAT
- MDW
2 stops8h 40m
Southwest
Deal found 3/6![Southwest logo]()
$327
This Delta deal was found by Cheapflights users on 3/9. 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.
Wed 9/25:00 pm
MLI
- SAT
1 stop7h 15m
Delta
Sun 9/62:10 pm
SAT
- MLI
1 stop8h 20m
Delta
Deal found 3/9![Delta logo]()
$299
This American Airlines deal was found by Cheapflights users on 3/10. 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 3/256:20 am
BMI
- SAT
1 stop6h 30m
American Airlines
Sun 3/295:19 am
SAT
- BMI
1 stop5h 42m
American Airlines
Deal found 3/10![American Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 3/7. 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.
Fri 4/103:20 pm
MLI
- SAT
1 stop7h 38m
United Airlines
Fri 4/174:17 pm
SAT
- MLI
2 stops7h 40m
United Airlines
Deal found 3/7![United Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 3/9. 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.
Fri 4/109:40 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Fri 4/172:40 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 3/9![Southwest logo]()
$331
This Delta deal was found by Cheapflights users on 3/10. 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.
Wed 6/2412:00 pm
BMI
- SAT
1 stop5h 13m
Delta
Sat 6/275:30 am
SAT
- BMI
1 stop5h 41m
Delta
Deal found 3/10![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:00 am
BMI
- SAT
2 stops9h 39m
United Airlines
Wed 7/86:40 am
SAT
- BMI
1 stop7h 43m
United Airlines
Deal found 3/8![United Airlines logo]()
$331
This Southwest deal was found by Cheapflights users on 3/8. 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 4/298:55 pm
STL
- SAT
Nonstop2h 20m
Southwest
Mon 5/47:20 am
SAT
- STL
Nonstop2h 10m
Southwest
Deal found 3/8![Southwest logo]()
$339
This Delta deal was found by Cheapflights users on 3/10. 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.
Fri 5/15:11 pm
MLI
- SAT
1 stop5h 14m
Delta
Tue 5/195:00 pm
SAT
- MLI
1 stop5h 21m
Delta
Deal found 3/10![Delta logo]()
$319
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated March 11, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated March 11, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 3/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2512:35 pm
ORD
- SAT
1 stop22h 05m
Multiple Airlines
Wed 4/810:22 am
SAT
- ORD
1 stop9h 29m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$280
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2611:21 am
STL
- SAT
2 stops22h 06m
Multiple Airlines
Sun 4/56:45 am
SAT
- STL
1 stop27h 03m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/294:51 pm
STL
- SAT
1 stop19h 36m
Multiple Airlines
Sun 4/56:45 am
SAT
- STL
1 stop27h 03m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:29 pm
STL
- SAT
1 stop22h 36m
Frontier
Thu 4/96:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/6![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:29 pm
STL
- SAT
1 stop22h 36m
Frontier
Mon 4/66:00 pm
SAT
- STL
1 stop16h 30m
Frontier
Deal found 3/6![Frontier logo]()
$227
This CheapOair deal was found by Cheapflights users on 3/10. 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.
Fri 4/36:10 pm
ORD
- SAT
1 stop15h 17m
Spirit Airlines
Mon 4/61:22 pm
SAT
- ORD
1 stop27h 34m
Spirit Airlines
Deal found 3/10![Spirit Airlines logo]()
$283
This American Airlines deal was found by Cheapflights users on 3/7. 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.
Sat 4/45:12 am
STL
- SAT
1 stop5h 46m
American Airlines
Sat 4/115:00 am
SAT
- STL
1 stop3h 54m
American Airlines
Deal found 3/7![American Airlines logo]()
$218
This CheapOair deal was found by Cheapflights users on 3/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/510:12 pm
STL
- SAT
1 stop12h 31m
Frontier
Sun 4/126:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/6![Frontier logo]()
$206
This CheapOair deal was found by Cheapflights users on 3/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/88:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Fri 4/106:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/8![Frontier logo]()
$171
This CheapOair deal was found by Cheapflights users on 3/9. 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.
Fri 4/108:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Fri 4/173:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Deal found 3/9![Frontier logo]()
$191
This CheapOair deal was found by Cheapflights users on 3/10. 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.
Fri 4/108:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Sun 4/126:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/10![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Thu 4/231:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Sat 4/256:00 am
SAT
- ORD
1 stop15h 17m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$282
One-way flights from Illinois to San AntonioSearch for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
This Frontier deal was found by Cheapflights users on 3/9. 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.
Thu 5/79:55 pm
STL
- SAT
1 stop13h 45m
Frontier
Deal found 3/9![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:53 pm
ORD
- SAT
1 stop30h 26m
Frontier
Deal found 3/6![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 3/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/83:29 pm
ORD
- SAT
1 stop8h 50m
Frontier
Deal found 3/6![Frontier logo]()
$90
This Priceline deal was found by Cheapflights users on 3/9. 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.
Sat 4/189:14 am
MDW
- SAT
1 stop8h 21m
Frontier
Deal found 3/9![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/9. 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.
Thu 4/97:55 am
ORD
- SAT
1 stop7h 56m
Frontier
Deal found 3/9![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/48:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Deal found 3/6![Frontier logo]()
$91
This CheapOair deal was found by Cheapflights users on 3/9. 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.
Wed 4/88:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Deal found 3/9![Frontier logo]()
$92
This Trip.com deal was found by Cheapflights users on 3/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/98:12 pm
STL
- SAT
1 stop18h 07m
Frontier
Deal found 3/10![Frontier logo]()
$94
This Priceline deal was found by Cheapflights users on 3/6. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/102:29 pm
ORD
- SAT
1 stop9h 50m
Frontier
Deal found 3/6![Frontier logo]()
$96
This Booking.com deal was found by Cheapflights users on 3/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:14 am
MDW
- SAT
1 stop24h 10m
Frontier
Deal found 3/6![Frontier logo]()
$96
This Priceline deal was found by Cheapflights users on 3/10. 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.
Sat 5/99:14 am
MDW
- SAT
1 stop8h 45m
Frontier
Deal found 3/10![Frontier logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/68:19 pm
STL
- SAT
1 stop28h 00m
Frontier
Deal found 3/6![Frontier logo]()
$100
Find flight deals from Illinois to San Antonio
Keep the following information in mind while searching for Illinois to San Antonio flight deals. Data was last updated March 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $160 (Expedia) |
One-way from | $86 (Frontier) |
Popular in | April |
Cheapest in | October |
Average price | $400 |
Good round-trip deal | $347 or less |
Good one-way deal | $192 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Antonio 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 March 11, 2026.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Thu 7/2
1:30 pm-8:17 pm
1 stop6h 47m
San Antonio
Sun 7/5
6:45 am-12:54 pm
1 stop6h 09m
$271
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Tue 4/7
6:00 am-12:42 pm
1 stop6h 42m
San Antonio
Fri 4/10
6:17 pm-11:58 pm
1 stop5h 41m
$271
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Thu 6/18
9:23 am-4:03 pm
1 stop6h 40m
San Antonio
Mon 6/29
6:40 am-12:11 pm
1 stop5h 31m
$275
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Tue 3/31
5:21 pm-12:38 am
1 stop7h 17m
San Antonio
Fri 4/3
12:34 pm-5:53 pm
1 stop5h 19m
$279
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Sun 4/19
5:35 am-12:05 pm
1 stop6h 30m
San Antonio
Wed 4/22
9:40 am-2:50 pm
1 stop5h 10m
$287
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Sat 4/11
12:02 pm-6:51 pm
1 stop6h 49m
San Antonio
Sat 4/18
4:20 pm-10:21 pm
1 stop6h 01m
$289
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Fri 4/10
4:04 pm-10:30 pm
1 stop6h 26m
San Antonio
Sat 4/18
5:20 am-11:19 am
1 stop5h 59m
$289
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Thu 8/13
6:01 am-11:10 am
1 stop5h 09m
San Antonio
Sun 8/16
4:25 pm-10:22 pm
1 stop5h 57m
$289
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Wed 4/8
6:00 am-10:50 am
1 stop4h 50m
San Antonio
Thu 4/9
4:17 pm-10:28 pm
1 stop6h 11m
$290
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Tue 5/12
9:41 am-7:40 pm
2 stops9h 59m
San Antonio
Sat 5/16
6:49 am-12:51 pm
1 stop6h 02m
$294
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to San Antonio
Have a flexible travel schedule? Discover the best time to fly to San Antonio from Illinois with our price prediction graph.
STL-SAT
MDW-SAT
MLI-SAT
ORD-SAT
CMI-SAT
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 Illinois to San Antonio
USIL-SAT
STL-SAT
MDW-SAT
MLI-SAT
ORD-SAT
What is the cheapest month to book a flight from Illinois to San Antonio?
Currently, January is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $59). Flying from Illinois to San Antonio in September is currently the most expensive (average of $154). 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 IL to SAT?
Find hourly flight availability from Illinois to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 11, 2026.
It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 8% on the cost of your flight, compared to a flight at noon.
What is the cheapest day to fly from Illinois to San Antonio?
Use this chart to determine the cheapest time to fly round-trip from Illinois to San Antonio. Price data was last updated on February 21, 2026.
Travelers seeking maximum savings on their Illinois to San Antonio flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Illinois to San Antonio
Explore weekly flight availability from Illinois to San Antonio. 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 March 11, 2026.
The most flights from USIL to SAT are scheduled on a Monday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Antonio. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
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
San Antonio flight routes
Top destinations
Alternative routes for Illinois to San Antonio
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Antonio by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to San Antonio by cabin class
Find flights from Illinois to San Antonio, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and San Antonio flights
Browse other Illinois and San Antonio flight options. Last updated on March 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Antonio
Explore flights to San Antonio departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on March 11, 2026.
Illinois to San Antonio flights
Consider these flights traveling from Illinois to San Antonio.
Top 6 airlines flying from Illinois to San Antonio
Discover the top 6 airlines that operate flights from Illinois to San Antonio. 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 March 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$200 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$167 | Average$253 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$198 | Average$350 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$328 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$235 | Average$406 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$405 | FlexibilityNo cancel fee | On-time63% |