$61+ 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
feb. 28 — mar. 71
1 adult, Economy
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Find cheap flights from Illinois to San Antonio with Cheapflights
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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 enero 29, 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 enero 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mar. 2/243:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
mar. 3/35:36 pm
SAT
- STL
1 stop22h 17m
Multiple Airlines
Deal found 1/29![Multiple Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 2/243:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
vie. 2/278:22 pm
SAT
- STL
1 stop17h 34m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
vie. 2/273:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
dom. 3/15:04 pm
SAT
- STL
1 stop13h 47m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
sáb. 2/288:17 pm
STL
- SAT
1 stop20h 02m
Frontier
jue. 3/58:25 pm
SAT
- STL
1 stop13h 24m
Frontier
Deal found 1/29![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mié. 3/45:18 pm
STL
- SAT
1 stop26h 12m
Frontier
mar. 3/106:45 am
SAT
- STL
1 stop27h 04m
Frontier
Deal found 1/29![Frontier logo]()
$169
This Expedia deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
jue. 2/2610:11 pm
STL
- SAT
1 stop23h 42m
Frontier
jue. 3/58:25 pm
SAT
- STL
1 stop13h 24m
Frontier
Deal found 1/29![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mié. 2/253:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
mié. 3/46:00 am
SAT
- STL
1 stop16h 27m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
jue. 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
lun. 3/25:08 pm
SAT
- STL
2 stops29h 19m
Frontier
Deal found 1/26![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 3/33:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
jue. 3/58:25 pm
SAT
- STL
1 stop13h 24m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
vie. 2/278:22 pm
STL
- SAT
2 stops16h 56m
Frontier
dom. 3/15:04 pm
SAT
- STL
1 stop13h 47m
Frontier
Deal found 1/27![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
jue. 2/2610:11 pm
STL
- SAT
2 stops21h 26m
Frontier
mar. 3/35:36 pm
SAT
- STL
1 stop22h 17m
Frontier
Deal found 1/28![Frontier logo]()
$183
This Mytrip deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mié. 3/258:41 pm
ORD
- SAT
1 stop12h 51m
Spirit Airlines
mar. 3/311:22 pm
SAT
- ORD
3 stops22h 25m
Spirit Airlines
Deal found 1/27![Spirit Airlines logo]()
$271
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 enero 29, 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 enero 29, 2026.
This CheapOair deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
jue. 2/2610:11 pm
STL
- SAT
1 stop23h 42m
Frontier
mar. 3/35:36 pm
SAT
- STL
1 stop22h 17m
Frontier
Deal found 1/28![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mié. 2/253:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
mié. 3/46:00 am
SAT
- STL
1 stop16h 27m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$174
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mar. 7/146:00 am
STL
- SAT
1 stop7h 07m
Delta
mar. 7/216:45 am
SAT
- STL
1 stop7h 53m
Delta
Deal found 1/28![Delta logo]()
$259
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mié. 4/226:00 am
STL
- SAT
1 stop4h 50m
United Airlines
dom. 4/264:17 pm
SAT
- STL
1 stop6h 11m
United Airlines
Deal found 1/27![United Airlines logo]()
$265
This Southwest deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mié. 4/12:15 pm
STL
- SAT
1 stop4h 10m
Southwest
lun. 4/61:00 pm
SAT
- STL
1 stop5h 55m
Southwest
Deal found 1/27![Southwest logo]()
$269
This American Airlines deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
sáb. 2/213:33 pm
MLI
- SAT
1 stop6h 25m
American Airlines
jue. 2/265:17 am
SAT
- MLI
1 stop7h 43m
American Airlines
Deal found 1/26![American Airlines logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 3/33:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
jue. 3/58:25 pm
SAT
- STL
1 stop13h 24m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$177
This Delta deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
mar. 3/246:00 am
STL
- SAT
1 stop5h 29m
Delta
sáb. 3/286:13 am
SAT
- STL
1 stop5h 54m
Delta
Deal found 1/26![Delta logo]()
$259
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
dom. 4/196:00 am
STL
- SAT
1 stop4h 50m
United Airlines
mié. 4/225:30 am
SAT
- STL
1 stop3h 55m
United Airlines
Deal found 1/27![United Airlines logo]()
$265
This Southwest deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 3/310:25 am
STL
- SAT
Nonstop2h 25m
Southwest
jue. 3/510:35 am
SAT
- STL
1 stop4h 05m
Southwest
Deal found 1/27![Southwest logo]()
$278
This American Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
vie. 2/207:00 pm
PIA
- SAT
1 stop4h 56m
American Airlines
mar. 2/244:47 pm
SAT
- PIA
2 stops6h 38m
American Airlines
Deal found 1/29![American Airlines logo]()
$284
This Delta deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
lun. 5/257:05 pm
STL
- SAT
1 stop5h 09m
Delta
sáb. 5/306:30 am
SAT
- STL
1 stop5h 00m
Delta
Deal found 1/26![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
vie. 4/173:20 pm
MLI
- SAT
1 stop7h 33m
United Airlines
mié. 4/221:25 pm
SAT
- MLI
1 stop8h 07m
United Airlines
Deal found 1/28![United Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mié. 2/258:10 am
MDW
- SAT
2 stops8h 50m
Southwest
mié. 3/42:10 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 1/28![Southwest logo]()
$290
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mar. 3/313:31 pm
MLI
- SAT
1 stop7h 23m
American Airlines
sáb. 4/115:45 pm
SAT
- MLI
1 stop5h 44m
American Airlines
Deal found 1/28![American Airlines logo]()
$294
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
jue. 4/166:30 am
MLI
- SAT
1 stop5h 54m
United Airlines
lun. 4/205:30 pm
SAT
- MLI
1 stop5h 15m
United Airlines
Deal found 1/27![United Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 3/248:35 pm
MDW
- SAT
Nonstop2h 55m
Southwest
mar. 4/149:05 am
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 1/27![Southwest logo]()
$299
This United Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
vie. 2/205:45 pm
PIA
- SAT
1 stop5h 27m
United Airlines
mar. 2/247:00 am
SAT
- PIA
1 stop5h 43m
United Airlines
Deal found 1/29![United Airlines logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
dom. 3/19:21 am
EVV
- SAT
1 stop10h 08m
Multiple Airlines
mié. 3/46:12 pm
SAT
- EVV
2 stops37h 27m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mar. 4/215:12 pm
MLI
- SAT
1 stop7h 18m
Delta
mar. 5/55:00 pm
SAT
- MLI
1 stop5h 35m
Delta
Deal found 1/28![Delta logo]()
$309
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
jue. 2/125:22 pm
PIA
- SAT
1 stop5h 45m
American Airlines
lun. 2/165:48 pm
SAT
- PIA
1 stop6h 08m
American Airlines
Deal found 1/28![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mar. 3/315:25 pm
PIA
- SAT
1 stop5h 28m
United Airlines
dom. 4/56:49 am
SAT
- PIA
1 stop5h 47m
United Airlines
Deal found 1/28![United Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mar. 4/215:12 pm
MLI
- SAT
1 stop7h 18m
Delta
lun. 5/44:30 pm
SAT
- MLI
1 stop6h 05m
Delta
Deal found 1/28![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
sáb. 2/288:40 pm
MDW
- SAT
Nonstop3h 00m
Southwest
lun. 3/23:50 pm
SAT
- MDW
1 stop5h 50m
Southwest
Deal found 1/27![Southwest logo]()
$320
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
dom. 4/195:12 pm
MLI
- SAT
1 stop7h 22m
Delta
mar. 5/55:00 pm
SAT
- MLI
1 stop5h 35m
Delta
Deal found 1/28![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mié. 2/189:05 am
ORD
- SAT
Nonstop3h 17m
United Airlines
sáb. 2/217:40 am
SAT
- ORD
1 stop4h 57m
United Airlines
Deal found 1/27![United Airlines logo]()
$285
This Southwest deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
mié. 2/252:10 pm
MDW
- SAT
1 stop7h 45m
Southwest
lun. 3/22:40 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Deal found 1/28![Southwest logo]()
$321
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 2/175:20 pm
ORD
- SAT
1 stop5h 32m
United Airlines
mié. 2/187:00 am
SAT
- ORD
Nonstop2h 50m
United Airlines
Deal found 1/27![United Airlines logo]()
$285
This Delta deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 3/319:40 am
ORD
- SAT
1 stop5h 42m
Delta
mié. 4/15:10 am
SAT
- ORD
1 stop8h 07m
Delta
Deal found 1/27![Delta logo]()
$319
This American Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
sáb. 5/235:30 pm
EVV
- SAT
1 stop6h 29m
American Airlines
mar. 5/265:40 pm
SAT
- EVV
1 stop5h 48m
American Airlines
Deal found 1/27![American Airlines logo]()
$387
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated enero 29, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated enero 29, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
lun. 2/25:40 am
ORD
- SAT
1 stop11h 23m
Multiple Airlines
jue. 2/510:35 am
SAT
- ORD
1 stop13h 12m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$274
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
vie. 2/135:05 am
ORD
- SAT
1 stop11h 10m
Multiple Airlines
dom. 2/155:04 pm
SAT
- ORD
2 stops16h 18m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mar. 2/243:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
mar. 3/35:36 pm
SAT
- STL
1 stop22h 17m
Multiple Airlines
Deal found 1/29![Multiple Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
mar. 2/243:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
vie. 2/278:22 pm
SAT
- STL
1 stop17h 34m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mié. 2/253:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
mié. 3/46:00 am
SAT
- STL
1 stop16h 27m
Multiple Airlines
Deal found 1/29![Multiple Airlines logo]()
$174
This CheapOair deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mié. 2/253:49 pm
STL
- SAT
1 stop21h 23m
Frontier
lun. 3/29:33 am
SAT
- STL
1 stop10h 19m
Frontier
Deal found 1/29![Frontier logo]()
$186
This Expedia deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
jue. 2/2610:11 pm
STL
- SAT
1 stop23h 42m
Frontier
jue. 3/58:25 pm
SAT
- STL
1 stop13h 24m
Frontier
Deal found 1/29![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
jue. 2/2610:11 pm
STL
- SAT
1 stop11h 47m
Frontier
lun. 3/25:08 pm
SAT
- STL
2 stops29h 19m
Frontier
Deal found 1/26![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
jue. 2/2610:11 pm
STL
- SAT
2 stops21h 26m
Frontier
mar. 3/35:36 pm
SAT
- STL
1 stop22h 17m
Frontier
Deal found 1/28![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
vie. 2/273:49 pm
STL
- SAT
1 stop8h 10m
Multiple Airlines
dom. 3/15:04 pm
SAT
- STL
1 stop13h 47m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
vie. 2/278:22 pm
STL
- SAT
2 stops16h 56m
Frontier
dom. 3/15:04 pm
SAT
- STL
1 stop13h 47m
Frontier
Deal found 1/27![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
sáb. 2/288:17 pm
STL
- SAT
1 stop20h 02m
Frontier
jue. 3/58:25 pm
SAT
- STL
1 stop13h 24m
Frontier
Deal found 1/29![Frontier logo]()
$167
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 enero 29, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated enero 29, 2026.
This Expedia deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mié. 2/258:16 pm
ORD
- SAT
1 stop13h 14m
Spirit Airlines
Deal found 1/29![Spirit Airlines logo]()
$61
This Expedia deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
lun. 2/238:16 pm
ORD
- SAT
1 stop13h 14m
Spirit Airlines
Deal found 1/29![Spirit Airlines logo]()
$64
This Cheapflightsfares deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/412:44 pm
ORD
- SAT
1 stop11h 15m
Spirit Airlines
Deal found 1/27![Spirit Airlines logo]()
$66
This Cheapflightsfares deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/288:16 pm
ORD
- SAT
1 stop13h 14m
Spirit Airlines
Deal found 1/27![Spirit Airlines logo]()
$68
This Trip.com deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
dom. 3/110:11 pm
STL
- SAT
1 stop22h 33m
Frontier
Deal found 1/26![Frontier logo]()
$69
This Cheapflightsfares deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/248:16 pm
ORD
- SAT
1 stop13h 14m
Spirit Airlines
Deal found 1/27![Spirit Airlines logo]()
$72
This Trip.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
lun. 2/96:20 am
MDW
- SAT
1 stop10h 43m
Frontier
Deal found 1/27![Frontier logo]()
$72
This Trip.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” 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.
sáb. 2/78:22 pm
STL
- SAT
1 stop20h 41m
Frontier
Deal found 1/28![Frontier logo]()
$72
This Trip.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
dom. 3/15:05 am
ORD
- SAT
1 stop11h 14m
Frontier
Deal found 1/27![Frontier logo]()
$73
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” 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.
sáb. 2/284:42 pm
ORD
- SAT
1 stop23h 37m
Frontier
Deal found 1/27![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mar. 3/312:44 pm
ORD
- SAT
1 stop11h 15m
Spirit Airlines
Deal found 1/29![Spirit Airlines logo]()
$75
This Expedia deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” 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.
mié. 4/18:41 pm
ORD
- SAT
1 stop12h 51m
Spirit Airlines
Deal found 1/29![Spirit Airlines logo]()
$76
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 enero 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $159 (Kiwi.com) |
One-way from | $60 (Expedia) |
Popular in | February |
Cheapest in | October |
Average price | $399 |
Good round-trip deal | $333 or less |
Good one-way deal | $183 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 enero 29, 2026.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.
Fly from
Illinois
Fly to
San Antonio
Route
Depart
Return
Price
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
jue. 2/26
10:11 pm-9:53 pm
1 stop23h 42m
San Antonio
mar. 3/3
5:36 pm-3:53 pm
1 stop22h 17m
$159
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
mié. 2/25
3:49 pm-11:59 pm
1 stop8h 10m
San Antonio
mié. 3/4
6:00 am-10:27 pm
1 stop16h 27m
$174
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
mar. 3/3
3:49 pm-11:59 pm
1 stop8h 10m
San Antonio
jue. 3/5
8:25 pm-9:49 am
1 stop13h 24m
$177
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
mar. 7/14
6:00 am-1:07 pm
1 stop7h 07m
San Antonio
mar. 7/21
6:45 am-2:38 pm
1 stop7h 53m
$259
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
mar. 3/24
6:00 am-11:29 am
1 stop5h 29m
San Antonio
sáb. 3/28
6:13 am-12:07 pm
1 stop5h 54m
$259
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
mié. 4/22
6:00 am-10:50 am
1 stop4h 50m
San Antonio
dom. 4/26
4:17 pm-10:28 pm
1 stop6h 11m
$265
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
dom. 4/19
6:00 am-10:50 am
1 stop4h 50m
San Antonio
mié. 4/22
5:30 am-9:25 am
1 stop3h 55m
$265
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
mié. 4/1
2:15 pm-6:25 pm
1 stop4h 10m
San Antonio
lun. 4/6
1:00 pm-6:55 pm
1 stop5h 55m
$269
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
lun. 5/25
7:05 pm-12:14 am
1 stop5h 09m
San Antonio
sáb. 5/30
6:30 am-11:30 am
1 stop5h 00m
$269
St. LouisSan Antonio
STL - SAT
STLSAT
Lambert-St Louis
mar. 3/3
10:25 am-12:50 pm
Nonstop2h 25m
San Antonio
jue. 3/5
10:35 am-2:40 pm
1 stop4h 05m
$278
Showing 1-10 of 60 results
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
ORD-SAT
MDW-SAT
MLI-SAT
PIA-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
ORD-SAT
MDW-SAT
MLI-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 enero 29, 2026.
It’s optimal to fly from Illinois to San Antonio in the afternoon. By choosing this option you can save up to 7% 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 January 24, 2026.
Travelers seeking maximum savings on their Illinois to San Antonio flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Monday 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 enero 29, 2026.
The most flights from USIL to SAT are scheduled on a Wednesday (18 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (5 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
See prices for flight routes from nearby airports that may be better suited for you.
Top 5 airlines flying from Illinois to San Antonio
Discover the top 5 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 enero 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$214 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$167 | Average$259 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$203 | Average$373 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$203 | Average$498 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$214 | Average$401 | FlexibilityNo cancel fee | On-time71% |