$78+ Cheap flights from San Antonio (SAT) to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Apr 5 — Apr 121
Round-trip
1 adult, Economy
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Cheapest flights from San Antonio to IllinoisExplore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 6, 2026.
Explore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 6, 2026.
This CheapOair deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 5/18:25 pm
SAT
- STL
1 stop18h 56m
Frontier
Sun 5/38:06 pm
STL
- SAT
1 stop18h 09m
Frontier
Deal found 3/3![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 5/93:34 pm
SAT
- ORD
1 stop18h 16m
Multiple Airlines
Tue 5/121:27 pm
ORD
- SAT
2 stops23h 50m
Multiple Airlines
Deal found 3/4![Multiple Airlines logo]()
$199
This Orbitz deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:31 pm
SAT
- ORD
1 stop12h 16m
Frontier
Sat 5/98:00 am
ORD
- SAT
1 stop9h 59m
Frontier
Deal found 3/3![Frontier logo]()
$201
This Booking.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:25 pm
SAT
- ORD
1 stop9h 43m
Frontier
Sun 5/310:50 am
ORD
- SAT
1 stop27h 25m
Frontier
Deal found 3/3![Frontier logo]()
$202
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/144:04 pm
SAT
- ORD
2 stops17h 58m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 4/144:04 pm
SAT
- ORD
2 stops17h 58m
Multiple Airlines
Fri 4/171:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$204
This CheapOair deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:45 am
SAT
- STL
1 stop27h 04m
Frontier
Fri 3/208:12 pm
STL
- SAT
1 stop28h 05m
Frontier
Deal found 3/3![Frontier logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/184:04 pm
SAT
- ORD
1 stop17h 41m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$208
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/154:49 pm
SAT
- ORD
2 stops18h 43m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$209
This CheapOair deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 5/1510:23 am
SAT
- ORD
1 stop29h 02m
Frontier
Sat 5/169:18 pm
ORD
- SAT
1 stop14h 22m
Frontier
Deal found 3/4![Frontier logo]()
$212
This Expedia deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
Tue 3/242:13 pm
SAT
- ORD
1 stop9h 25m
Frontier
Sat 4/45:53 pm
ORD
- SAT
1 stop6h 26m
Frontier
Deal found 3/2![Frontier logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 5/73:14 pm
SAT
- ORD
1 stop18h 36m
Multiple Airlines
Mon 5/119:44 pm
ORD
- SAT
2 stops40h 35m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$216
Best flights from San Antonio to IllinoisDiscover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 6, 2026.
Discover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 6, 2026.
This United Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 4/1111:46 am
SAT
- STL
1 stop4h 22m
United Airlines
Fri 4/176:00 am
STL
- SAT
1 stop4h 50m
United Airlines
Deal found 3/1![United Airlines logo]()
$240
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 4/164:30 pm
SAT
- STL
1 stop6h 55m
Southwest
Sun 4/195:35 pm
STL
- SAT
1 stop7h 10m
Southwest
Deal found 3/1![Southwest logo]()
$267
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 8/205:50 pm
SAT
- STL
1 stop5h 11m
Delta
Tue 8/259:00 am
STL
- SAT
1 stop6h 16m
Delta
Deal found 3/1![Delta logo]()
$267
This American Airlines deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 4/15:00 am
SAT
- MLI
2 stops8h 21m
American Airlines
Sun 4/56:00 am
MLI
- SAT
1 stop7h 01m
American Airlines
Deal found 3/4![American Airlines logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/102:12 pm
SAT
- RFD
2 stops20h 25m
Multiple Airlines
Sun 6/1411:27 am
RFD
- SAT
1 stop12h 24m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$328
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 4/206:12 pm
SAT
- STL
1 stop5h 01m
Delta
Thu 4/309:59 am
STL
- SAT
1 stop7h 39m
Delta
Deal found 3/1![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/31:00 pm
SAT
- STL
1 stop5h 55m
Southwest
Mon 4/68:35 am
STL
- SAT
1 stop7h 05m
Southwest
Deal found 3/2![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 5/15:49 pm
SAT
- PIA
1 stop5h 00m
United Airlines
Mon 5/45:30 pm
PIA
- SAT
1 stop5h 24m
United Airlines
Deal found 3/3![United Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/226:21 pm
SAT
- STL
1 stop5h 38m
Delta
Tue 5/268:53 am
STL
- SAT
1 stop8h 27m
Delta
Deal found 3/5![Delta logo]()
$271
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/74:17 pm
SAT
- STL
1 stop6h 11m
United Airlines
Thu 4/96:00 am
STL
- SAT
1 stop4h 50m
United Airlines
Deal found 3/5![United Airlines logo]()
$282
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/77:25 am
SAT
- STL
Nonstop2h 10m
Southwest
Thu 4/95:45 am
STL
- SAT
1 stop7h 30m
Southwest
Deal found 3/5![Southwest logo]()
$288
This American Airlines deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 3/185:00 am
SAT
- PIA
1 stop5h 39m
American Airlines
Sun 3/225:22 pm
PIA
- SAT
1 stop5h 45m
American Airlines
Deal found 3/3![American Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 5/285:25 am
SAT
- STL
1 stop6h 55m
Delta
Sun 5/316:00 am
STL
- SAT
1 stop5h 03m
Delta
Deal found 3/3![Delta logo]()
$287
This Southwest deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/97:20 am
SAT
- STL
Nonstop2h 10m
Southwest
Sun 4/125:35 pm
STL
- SAT
1 stop7h 10m
Southwest
Deal found 3/2![Southwest logo]()
$289
This United Airlines deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 4/105:35 pm
SAT
- PIA
1 stop6h 22m
United Airlines
Mon 4/135:35 pm
PIA
- SAT
1 stop5h 32m
United Airlines
Deal found 3/4![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 4/15:36 pm
SAT
- MLI
1 stop5h 17m
American Airlines
Tue 4/712:52 pm
MLI
- SAT
1 stop9h 09m
American Airlines
Deal found 3/3![American Airlines logo]()
$334
This Delta deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 4/105:10 am
SAT
- BMI
1 stop6h 10m
Delta
Mon 4/134:20 pm
BMI
- SAT
1 stop8h 26m
Delta
Deal found 3/4![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:30 am
SAT
- STL
2 stops6h 20m
Southwest
Sun 4/196:35 pm
STL
- SAT
1 stop7h 20m
Southwest
Deal found 3/5![Southwest logo]()
$292
This United Airlines deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 4/15:50 pm
SAT
- ORD
Nonstop2h 56m
United Airlines
Wed 4/82:05 pm
ORD
- SAT
1 stop6h 37m
United Airlines
Deal found 3/4![United Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 4/175:20 am
SAT
- BMI
1 stop5h 59m
Delta
Mon 4/204:20 pm
BMI
- SAT
1 stop8h 26m
Delta
Deal found 3/4![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 7/185:10 pm
SAT
- MDW
1 stop6h 00m
Southwest
Sat 7/2510:55 am
MDW
- SAT
Nonstop2h 40m
Southwest
Deal found 3/1![Southwest logo]()
$294
This American Airlines deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 3/245:19 am
SAT
- MLI
1 stop8h 02m
American Airlines
Sat 3/282:02 pm
MLI
- SAT
2 stops9h 57m
American Airlines
Deal found 3/3![American Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 5/306:47 am
SAT
- PIA
1 stop5h 59m
United Airlines
Mon 6/15:33 pm
PIA
- SAT
1 stop5h 21m
United Airlines
Deal found 3/1![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/179:36 am
SAT
- BMI
1 stop5h 39m
American Airlines
Mon 4/202:46 pm
BMI
- SAT
2 stops9h 10m
American Airlines
Deal found 3/4![American Airlines logo]()
$364
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/184:20 pm
SAT
- MDW
1 stop6h 08m
Delta
Tue 4/216:00 am
MDW
- SAT
1 stop5h 21m
Delta
Deal found 3/2![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 7/189:50 am
SAT
- ORD
1 stop6h 15m
Southwest
Sat 7/253:10 pm
ORD
- SAT
1 stop6h 55m
Southwest
Deal found 3/1![Southwest logo]()
$320
This United Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 3/249:52 am
SAT
- ORD
1 stop4h 52m
United Airlines
Sat 3/288:03 pm
ORD
- SAT
Nonstop3h 12m
United Airlines
Deal found 3/1![United Airlines logo]()
$343
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 5/222:12 pm
SAT
- RFD
1 stop19h 09m
Multiple Airlines
Sun 5/241:11 pm
RFD
- SAT
2 stops29h 20m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$572
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.
Wed 5/66:20 am
SAT
- MDW
1 stop5h 47m
Delta
Mon 5/119:22 am
MDW
- SAT
1 stop6h 30m
Delta
Deal found 3/6![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 5/73:20 pm
SAT
- MDW
1 stop5h 45m
Southwest
Sat 5/96:15 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 3/4![Southwest logo]()
$332
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated March 6, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated March 6, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:45 am
SAT
- STL
1 stop27h 04m
Frontier
Fri 3/208:12 pm
STL
- SAT
1 stop28h 05m
Frontier
Deal found 3/3![Frontier logo]()
$205
This Expedia deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
Tue 3/242:13 pm
SAT
- ORD
1 stop9h 25m
Frontier
Sat 4/45:53 pm
ORD
- SAT
1 stop6h 26m
Frontier
Deal found 3/2![Frontier logo]()
$215
This Frontier deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 4/17:45 am
SAT
- ORD
1 stop6h 34m
Frontier
Sat 4/45:53 pm
ORD
- SAT
1 stop6h 26m
Frontier
Deal found 3/4![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 4/77:45 am
SAT
- ORD
2 stops38h 54m
Multiple Airlines
Sat 4/181:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$220
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/144:04 pm
SAT
- ORD
2 stops17h 58m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 4/144:04 pm
SAT
- ORD
2 stops17h 58m
Multiple Airlines
Fri 4/171:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/144:04 pm
SAT
- ORD
2 stops17h 58m
Multiple Airlines
Thu 4/237:15 pm
ORD
- SAT
1 stop28h 36m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/144:04 pm
SAT
- ORD
2 stops17h 58m
Multiple Airlines
Fri 4/241:43 pm
ORD
- SAT
1 stop10h 08m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$221
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/154:49 pm
SAT
- ORD
2 stops18h 43m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/154:49 pm
SAT
- ORD
2 stops18h 43m
Multiple Airlines
Sun 4/192:10 pm
ORD
- SAT
1 stop9h 41m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 4/176:00 am
SAT
- ORD
1 stop16h 54m
Multiple Airlines
Mon 4/206:31 pm
ORD
- SAT
2 stops20h 38m
Multiple Airlines
Deal found 3/4![Multiple Airlines logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/184:04 pm
SAT
- ORD
1 stop17h 41m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$208
One-way flights from San Antonio to IllinoisSearch for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated March 6, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated March 6, 2026.
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 4/26:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/6![Frontier logo]()
$78
This Frontier deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:13 pm
SAT
- STL
1 stop9h 06m
Frontier
Deal found 3/3![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/294:49 pm
SAT
- STL
1 stop26h 32m
Frontier
Deal found 3/2![Frontier logo]()
$82
This Expedia deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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.
Sun 5/32:59 pm
SAT
- STL
1 stop28h 33m
Frontier
Deal found 3/4![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/171:22 pm
SAT
- ORD
1 stop6h 41m
Spirit Airlines
Deal found 3/2![Spirit Airlines logo]()
$89
This Priceline deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 5/18:25 pm
SAT
- ORD
1 stop9h 43m
Frontier
Deal found 3/3![Frontier logo]()
$90
This CheapOair deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 5/13:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Deal found 3/2![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 5/123:14 pm
SAT
- MDW
2 stops28h 17m
Frontier
Deal found 3/3![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 4/214:04 pm
SAT
- MDW
2 stops27h 27m
Frontier
Deal found 3/3![Frontier logo]()
$95
This Booking.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:04 pm
SAT
- ORD
1 stop17h 41m
Frontier
Deal found 3/3![Frontier logo]()
$96
This Expedia deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 4/186:30 pm
SAT
- MDW
1 stop13h 29m
Frontier
Deal found 3/3![Frontier logo]()
$96
This Booking.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1412:30 pm
SAT
- ORD
1 stop17h 38m
Frontier
Deal found 3/2![Frontier logo]()
$97
Find flight deals from San Antonio to Illinois
Keep the following information in mind while searching for San Antonio to Illinois flight deals. Data was last updated March 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $171 (CheapOair) |
One-way from | $78 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $394 |
Good round-trip deal | $368 or less |
Good one-way deal | $203 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from San Antonio to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 6, 2026.
Use the filters below to find and compare flights from San Antonio to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Sat 4/11
11:46 am-4:08 pm
1 stop4h 22m
Lambert-St Louis
Fri 4/17
6:00 am-10:50 am
1 stop4h 50m
$240
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 4/16
4:30 pm-11:25 pm
1 stop6h 55m
Lambert-St Louis
Sun 4/19
5:35 pm-12:45 am
1 stop7h 10m
$267
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 8/20
5:50 pm-11:01 pm
1 stop5h 11m
Lambert-St Louis
Tue 8/25
9:00 am-3:16 pm
1 stop6h 16m
$267
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Mon 4/20
6:12 pm-11:13 pm
1 stop5h 01m
Lambert-St Louis
Thu 4/30
9:59 am-5:38 pm
1 stop7h 39m
$267
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Fri 4/3
1:00 pm-6:55 pm
1 stop5h 55m
Lambert-St Louis
Mon 4/6
8:35 am-3:40 pm
1 stop7h 05m
$267
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Fri 5/22
6:21 pm-11:59 pm
1 stop5h 38m
Lambert-St Louis
Tue 5/26
8:53 am-5:20 pm
1 stop8h 27m
$271
San AntonioPeoria
SAT - PIA
SATPIA
San Antonio
Fri 5/1
5:49 pm-10:49 pm
1 stop5h 00m
Greater Peoria
Mon 5/4
5:30 pm-10:54 pm
1 stop5h 24m
$279
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Tue 4/7
4:17 pm-10:28 pm
1 stop6h 11m
Lambert-St Louis
Thu 4/9
6:00 am-10:50 am
1 stop4h 50m
$282
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Thu 5/28
5:25 am-12:20 pm
1 stop6h 55m
Lambert-St Louis
Sun 5/31
6:00 am-11:03 am
1 stop5h 03m
$287
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Tue 4/7
7:25 am-9:35 am
Nonstop2h 10m
Lambert-St Louis
Thu 4/9
5:45 am-1:15 pm
1 stop7h 30m
$288
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Antonio to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Antonio with our price prediction graph.
SAT-STL
SAT-MLI
SAT-RFD
SAT-PIA
SAT-BMI
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Antonio to Illinois
SAT-USIL
SAT-STL
SAT-MLI
SAT-RFD
SAT-PIA
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, January is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $54). Flying from San Antonio to Illinois in May is currently the most expensive (average of $161). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SAT to IL?
Find hourly flight availability from San Antonio to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 6, 2026.
It’s optimal to fly from San Antonio to Illinois in the morning. By choosing this option you can save up to 40% on the cost of your flight, compared to a flight in the evening.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated March 6, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest, United Airlines, and American Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Related info for your journey
Find useful and relevant information for your journey from San Antonio to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for San Antonio to Illinois
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Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from San Antonio to Illinois by cabin class
Find flights from San Antonio to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on March 6, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
San Antonio to Illinois flights
Consider these flights traveling from San Antonio to Illinois.
Top 5 airlines flying from San Antonio to Illinois
Discover the top 5 airlines that operate flights from San Antonio to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$213 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$143 | Average$261 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$216 | Average$405 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$247 | Average$414 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$400 | FlexibilityNo cancel fee | On-time63% |