$88+ 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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Apr 18 — Apr 251
Round-trip
1 adult, Economy
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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 19, 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 19, 2026.
This Expedia deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:55 pm
STL
- SAT
1 stop13h 45m
Frontier
Thu 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Deal found 3/14![Frontier logo]()
$180
This CheapOair deal was found by Cheapflights users on 3/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:51 pm
STL
- SAT
1 stop25h 23m
Frontier
Sun 5/107:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 3/17![Frontier logo]()
$191
This CheapOair deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/258:17 pm
STL
- SAT
1 stop17h 56m
Frontier
Fri 5/18:25 pm
SAT
- STL
1 stop18h 56m
Frontier
Deal found 3/15![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:23 pm
STL
- SAT
2 stops37h 01m
Frontier
Wed 4/224:49 pm
SAT
- STL
1 stop26h 32m
Frontier
Deal found 3/18![Frontier logo]()
$221
This Mytrip deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Tue 4/77:45 am
SAT
- STL
1 stop26h 03m
Frontier
Deal found 3/14![Frontier logo]()
$224
This Expedia deal was found by Cheapflights users on 3/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:55 pm
STL
- SAT
1 stop13h 13m
Frontier
Mon 4/201:51 pm
SAT
- STL
1 stop9h 28m
Frontier
Deal found 3/16![Frontier logo]()
$225
This CheapOair deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/28:17 pm
STL
- SAT
1 stop17h 56m
Frontier
Tue 5/58:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Deal found 3/14![Frontier logo]()
$233
This Expedia deal was found by Cheapflights users on 3/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/258:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Mon 3/302:13 pm
SAT
- STL
1 stop9h 06m
Frontier
Deal found 3/16![Frontier logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Mon 4/66:00 pm
SAT
- STL
1 stop16h 30m
Frontier
Deal found 3/16![Frontier logo]()
$247
This Gotogate deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/288:12 pm
STL
- SAT
1 stop28h 05m
Frontier
Tue 4/77:45 am
SAT
- STL
1 stop26h 03m
Frontier
Deal found 3/15![Frontier logo]()
$249
This CheapOair deal was found by Cheapflights users on 3/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:51 pm
STL
- SAT
1 stop25h 23m
Frontier
Mon 5/257:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 3/18![Frontier logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/258:17 pm
STL
- SAT
1 stop17h 56m
Frontier
Thu 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Deal found 3/15![Frontier logo]()
$267
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 19, 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 19, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/307:46 pm
EVV
- SAT
1 stop16h 41m
Multiple Airlines
Sun 4/510:22 am
SAT
- EVV
2 stops20h 51m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$286
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:25 pm
STL
- SAT
1 stop3h 55m
Southwest
Wed 4/221:40 pm
SAT
- STL
1 stop4h 15m
Southwest
Deal found 3/16![Southwest logo]()
$286
This United Airlines deal was found by Cheapflights users on 3/17. 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 4/149:10 am
STL
- SAT
2 stops8h 33m
United Airlines
Sat 4/1811:46 am
SAT
- STL
1 stop4h 22m
United Airlines
Deal found 3/17![United Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/143:45 pm
BMI
- SAT
1 stop7h 07m
American Airlines
Sat 4/186:26 am
SAT
- BMI
1 stop7h 50m
American Airlines
Deal found 3/14![American Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/110:12 am
STL
- SAT
1 stop8h 02m
Delta
Mon 4/66:17 pm
SAT
- STL
1 stop5h 41m
Delta
Deal found 3/14![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/165:15 pm
STL
- SAT
1 stop5h 40m
Southwest
Mon 4/207:20 am
SAT
- STL
Nonstop2h 10m
Southwest
Deal found 3/16![Southwest logo]()
$294
This American Airlines deal was found by Cheapflights users on 3/16. 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.
Sat 4/1111:16 am
BMI
- SAT
1 stop6h 28m
American Airlines
Sat 4/186:26 am
SAT
- BMI
1 stop7h 50m
American Airlines
Deal found 3/16![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:00 am
STL
- SAT
1 stop4h 50m
United Airlines
Sun 4/56:02 pm
SAT
- STL
1 stop4h 26m
United Airlines
Deal found 3/15![United Airlines logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/307:46 pm
EVV
- SAT
1 stop16h 41m
Multiple Airlines
Thu 4/210:22 am
SAT
- EVV
2 stops20h 51m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$321
This Delta deal was found by Cheapflights users on 3/17. 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.
Tue 4/145:21 pm
MDW
- SAT
1 stop7h 25m
Delta
Mon 4/2011:50 am
SAT
- MDW
1 stop6h 08m
Delta
Deal found 3/17![Delta logo]()
$323
This Southwest deal was found by Cheapflights users on 3/18. 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.
Sat 4/188:45 am
STL
- SAT
Nonstop2h 15m
Southwest
Sat 4/257:15 am
SAT
- STL
1 stop6h 45m
Southwest
Deal found 3/18![Southwest logo]()
$294
This United Airlines deal was found by Cheapflights users on 3/17. 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.
Wed 5/69:05 am
ORD
- SAT
Nonstop3h 10m
United Airlines
Fri 5/87:10 pm
SAT
- ORD
1 stop5h 35m
United Airlines
Deal found 3/17![United Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/134:20 pm
BMI
- SAT
1 stop6h 05m
Delta
Sat 4/186:20 am
SAT
- BMI
1 stop4h 59m
Delta
Deal found 3/14![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/186:10 am
STL
- SAT
2 stops10h 50m
Southwest
Tue 4/216:20 am
SAT
- STL
2 stops6h 40m
Southwest
Deal found 3/15![Southwest logo]()
$301
This United Airlines deal was found by Cheapflights users on 3/17. 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 5/29:05 am
ORD
- SAT
Nonstop3h 10m
United Airlines
Mon 5/47:10 pm
SAT
- ORD
1 stop6h 17m
United Airlines
Deal found 3/17![United Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/134:20 pm
BMI
- SAT
1 stop8h 26m
Delta
Tue 4/215:20 am
SAT
- BMI
1 stop5h 59m
Delta
Deal found 3/15![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 3/17. 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.
Tue 4/149:00 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Tue 4/215:40 pm
SAT
- MDW
1 stop4h 05m
Southwest
Deal found 3/17![Southwest logo]()
$303
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 5/266:28 pm
SAT
- EVV
1 stop5h 31m
American Airlines
Deal found 3/14![American Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 3/18. 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.
Sun 4/194:20 pm
BMI
- SAT
1 stop8h 26m
Delta
Fri 5/16:20 am
SAT
- BMI
1 stop4h 59m
Delta
Deal found 3/18![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/296:00 am
BMI
- SAT
1 stop6h 12m
United Airlines
Sun 5/316:40 am
SAT
- BMI
1 stop7h 43m
United Airlines
Deal found 3/15![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 3/17. 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.
Wed 4/158:25 am
STL
- SAT
Nonstop2h 20m
Southwest
Wed 4/155:05 pm
SAT
- STL
1 stop5h 15m
Southwest
Deal found 3/17![Southwest logo]()
$307
This American Airlines deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:41 pm
MLI
- SAT
1 stop5h 18m
American Airlines
Mon 4/203:11 pm
SAT
- MLI
2 stops8h 43m
American Airlines
Deal found 3/15![American Airlines logo]()
$392
This United Airlines deal was found by Cheapflights users on 3/16. 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.
Thu 5/212:58 pm
BMI
- SAT
1 stop7h 56m
United Airlines
Tue 5/265:18 pm
SAT
- BMI
1 stop5h 09m
United Airlines
Deal found 3/16![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 3/17. 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.
Fri 5/85:17 pm
MLI
- SAT
1 stop7h 27m
Delta
Sat 5/95:00 pm
SAT
- MLI
1 stop5h 21m
Delta
Deal found 3/17![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 3/17. 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.
Thu 4/99:40 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Mon 4/136:45 pm
SAT
- MDW
1 stop5h 10m
Southwest
Deal found 3/17![Southwest logo]()
$319
This United Airlines deal was found by Cheapflights users on 3/17. 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.
Wed 5/278:10 am
MLI
- SAT
1 stop7h 53m
United Airlines
Wed 6/106:40 am
SAT
- MLI
1 stop5h 59m
United Airlines
Deal found 3/17![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 3/18. 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 9/25:55 am
MLI
- SAT
1 stop7h 12m
Delta
Sun 9/62:10 pm
SAT
- MLI
1 stop8h 20m
Delta
Deal found 3/18![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/910:30 am
MDW
- SAT
2 stops7h 15m
Southwest
Sat 5/167:15 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 3/16![Southwest logo]()
$324
This American Airlines deal was found by Cheapflights users on 3/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:58 pm
CMI
- SAT
1 stop5h 01m
American Airlines
Fri 5/16:26 am
SAT
- CMI
1 stop7h 42m
American Airlines
Deal found 3/18![American Airlines logo]()
$446
This United Airlines deal was found by Cheapflights users on 3/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:30 am
PIA
- SAT
1 stop5h 54m
United Airlines
Sat 5/26:49 am
SAT
- PIA
1 stop6h 08m
United Airlines
Deal found 3/18![United Airlines logo]()
$339
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated March 19, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated March 19, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 3/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/258:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Mon 3/302:13 pm
SAT
- STL
1 stop9h 06m
Frontier
Deal found 3/16![Frontier logo]()
$236
This Expedia deal was found by Cheapflights users on 3/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/278:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Tue 3/312:13 pm
SAT
- STL
1 stop9h 06m
Frontier
Deal found 3/18![Frontier logo]()
$261
This Gotogate deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/288:12 pm
STL
- SAT
1 stop28h 05m
Frontier
Tue 4/77:45 am
SAT
- STL
1 stop26h 03m
Frontier
Deal found 3/15![Frontier logo]()
$249
This Mytrip deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Tue 4/77:45 am
SAT
- STL
1 stop26h 03m
Frontier
Deal found 3/14![Frontier logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Mon 4/66:00 pm
SAT
- STL
1 stop16h 30m
Frontier
Deal found 3/16![Frontier logo]()
$247
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:21 am
STL
- SAT
2 stops36h 58m
Frontier
Wed 5/137:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 3/18![Frontier logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:23 pm
STL
- SAT
2 stops37h 01m
Frontier
Wed 4/224:49 pm
SAT
- STL
1 stop26h 32m
Frontier
Deal found 3/18![Frontier logo]()
$221
This Expedia deal was found by Cheapflights users on 3/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:55 pm
STL
- SAT
1 stop13h 13m
Frontier
Mon 4/201:51 pm
SAT
- STL
1 stop9h 28m
Frontier
Deal found 3/16![Frontier logo]()
$225
This Kiwi.com deal was found by Cheapflights users on 3/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/177:46 pm
EVV
- SAT
1 stop21h 49m
Multiple Airlines
Wed 4/222:12 pm
SAT
- EVV
1 stop25h 11m
Multiple Airlines
Deal found 3/17![Multiple Airlines logo]()
$274
This Expedia deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:55 pm
STL
- SAT
1 stop13h 45m
Frontier
Thu 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Deal found 3/14![Frontier logo]()
$180
This CheapOair deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/258:17 pm
STL
- SAT
1 stop17h 56m
Frontier
Fri 5/18:25 pm
SAT
- STL
1 stop18h 56m
Frontier
Deal found 3/15![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/258:17 pm
STL
- SAT
1 stop17h 56m
Frontier
Thu 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Deal found 3/15![Frontier logo]()
$267
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 19, 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 19, 2026.
This Trip.com deal was found by Cheapflights users on 3/18. 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.
Fri 4/178:06 pm
STL
- SAT
1 stop19h 03m
Frontier
Deal found 3/18![Frontier logo]()
$88
This Travelocity deal was found by Cheapflights users on 3/17. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:55 pm
STL
- SAT
1 stop13h 13m
Frontier
Deal found 3/17![Frontier logo]()
$96
This Expedia deal was found by Cheapflights users on 3/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/188:00 am
ORD
- SAT
1 stop9h 35m
Frontier
Deal found 3/17![Frontier logo]()
$100
This Expedia deal was found by Cheapflights users on 3/17. 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 Expedia 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 3/17![Frontier logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/208:17 pm
STL
- SAT
1 stop18h 52m
Frontier
Deal found 3/18![Frontier logo]()
$100
This eDestinos deal was found by Cheapflights users on 3/17. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:38 am
ORD
- SAT
1 stop25h 46m
Frontier
Deal found 3/17![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/199:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/18![Frontier logo]()
$102
This CheapOair deal was found by Cheapflights users on 3/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/118:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Deal found 3/17![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/135:15 am
ORD
- SAT
1 stop11h 50m
Frontier
Deal found 3/16![Frontier logo]()
$106
This Frontier deal was found by Cheapflights users on 3/17. 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 4/136:00 am
MDW
- SAT
1 stop11h 05m
Frontier
Deal found 3/17![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/129:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/14![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 3/18. 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 5/1412:16 pm
STL
- SAT
1 stop7h 58m
Frontier
Deal found 3/18![Frontier logo]()
$111
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 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $180 (Expedia) |
One-way from | $88 (Trip.com) |
Popular in | April |
Cheapest in | October |
Average price | $400 |
Good round-trip deal | $330 or less |
Good one-way deal | $166 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 19, 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
EvansvilleSan Antonio
EVV - SAT
EVVSAT
Evansville Dress Regional
Mon 3/30
7:46 pm-12:27 pm
1 stop16h 41m
San Antonio
Sun 4/5
10:22 am-7:13 am
2 stops20h 51m
$286
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Tue 4/21
1:25 pm-5:20 pm
1 stop3h 55m
San Antonio
Wed 4/22
1:40 pm-5:55 pm
1 stop4h 15m
$286
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Thu 4/16
5:15 pm-10:55 pm
1 stop5h 40m
San Antonio
Mon 4/20
7:20 am-9:30 am
Nonstop2h 10m
$294
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Sat 4/18
8:45 am-11:00 am
Nonstop2h 15m
San Antonio
Sat 4/25
7:15 am-2:00 pm
1 stop6h 45m
$294
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Sat 4/18
6:10 am-5:00 pm
2 stops10h 50m
San Antonio
Tue 4/21
6:20 am-1:00 pm
2 stops6h 40m
$301
Quickest round-trip
ChicagoSan Antonio
MDW - SAT
MDWSAT
Chicago Midway
Tue 4/14
9:00 pm-11:50 pm
Nonstop2h 50m
San Antonio
Tue 4/21
5:40 pm-9:45 pm
1 stop4h 05m
$303
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Wed 4/15
8:25 am-10:45 am
Nonstop2h 20m
San Antonio
Wed 4/15
5:05 pm-10:20 pm
1 stop5h 15m
$307
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
Tue 4/14
9:10 am-5:43 pm
2 stops8h 33m
San Antonio
Sat 4/18
11:46 am-4:08 pm
1 stop4h 22m
$309
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Tue 4/14
3:45 pm-10:52 pm
1 stop7h 07m
San Antonio
Sat 4/18
6:26 am-2:16 pm
1 stop7h 50m
$309
BloomingtonSan Antonio
BMI - SAT
BMISAT
Bloomington-Normal
Sat 4/11
11:16 am-5:44 pm
1 stop6h 28m
San Antonio
Sat 4/18
6:26 am-2:16 pm
1 stop7h 50m
$309
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.
EVV-SAT
STL-SAT
BMI-SAT
MDW-SAT
ORD-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
EVV-SAT
STL-SAT
BMI-SAT
MDW-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 19, 2026.
It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 9% 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 March 14, 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. Sunday at noon 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 19, 2026.
The most flights from USIL to SAT are scheduled on a Wednesday (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
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Alternative routes for Illinois to San Antonio
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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 19, 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 19, 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 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$200 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$176 | Average$254 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$214 | Average$348 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$358 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$234 | Average$404 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$409 | FlexibilityNo cancel fee | On-time63% |