$82+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
May 4 — May 111
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 April 4, 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 April 4, 2026.
This CheapOair deal was found by Cheapflights users on 4/2. 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.
Tue 5/58:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Thu 5/712:36 pm
STL
- SAT
1 stop7h 38m
Frontier
Deal found 4/2![Frontier logo]()
$151
This Expedia deal was found by Cheapflights users on 4/2. 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.
Thu 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Thu 5/712:36 pm
STL
- SAT
1 stop7h 38m
Frontier
Deal found 4/2![Frontier logo]()
$160
This CheapOair deal was found by Cheapflights users on 4/3. 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 5/87:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Tue 5/126:51 pm
STL
- SAT
1 stop25h 23m
Frontier
Deal found 4/3![Frontier logo]()
$171
This Frontier deal was found by Cheapflights users on 4/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/243:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Mon 4/278:17 pm
STL
- SAT
1 stop18h 52m
Frontier
Deal found 4/1![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 4/3. 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.
Thu 4/233:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Mon 4/278:17 pm
STL
- SAT
1 stop18h 52m
Frontier
Deal found 4/3![Frontier logo]()
$188
This CheapOair deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/173:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Sun 4/199:55 pm
STL
- SAT
1 stop19h 36m
Frontier
Deal found 3/31![Frontier logo]()
$191
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:04 pm
SAT
- STL
1 stop27h 17m
Frontier
Mon 4/208:17 pm
STL
- SAT
1 stop18h 52m
Frontier
Deal found 4/1![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/306:00 am
SAT
- ORD
1 stop15h 17m
Multiple Airlines
Mon 5/119:42 pm
ORD
- SAT
1 stop21h 17m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$226
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/187:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
Mon 6/19:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/31![Frontier logo]()
$227
This CheapOair deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” 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 4/116:45 am
SAT
- ORD
1 stop17h 53m
Frontier
Mon 4/135:15 am
ORD
- SAT
1 stop11h 50m
Frontier
Deal found 3/30![Frontier logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/197:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
Tue 6/26:55 am
ORD
- SAT
2 stops12h 04m
Frontier
Deal found 3/31![Frontier logo]()
$235
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/187:54 pm
SAT
- ORD
2 stops19h 09m
Multiple Airlines
Wed 6/39:42 pm
ORD
- SAT
1 stop21h 17m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$236
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 April 4, 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 April 4, 2026.
This Delta deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” 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 8/208:00 am
SAT
- STL
1 stop6h 38m
Delta
Tue 8/255:30 pm
STL
- SAT
1 stop6h 45m
Delta
Deal found 3/30![Delta logo]()
$291
This Southwest deal was found by Cheapflights users on 4/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/202:35 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Tue 5/269:00 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 4/3![Southwest logo]()
$297
This United Airlines deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:18 pm
SAT
- ORD
Nonstop3h 03m
United Airlines
Tue 6/92:05 pm
ORD
- SAT
1 stop7h 08m
United Airlines
Deal found 3/31![United Airlines logo]()
$307
This American Airlines deal was found by Cheapflights users on 4/3. 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 4/286:14 pm
SAT
- BMI
1 stop5h 38m
American Airlines
Tue 5/53:45 pm
BMI
- SAT
1 stop7h 07m
American Airlines
Deal found 4/3![American Airlines logo]()
$307
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/2211:30 am
SAT
- RFD
2 stops21h 51m
Multiple Airlines
Sun 5/2411:27 am
RFD
- SAT
1 stop28h 49m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 4/4. 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.
Tue 5/52:35 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Sat 5/910:45 am
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 4/4![Southwest logo]()
$303
This Delta deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/276:12 pm
SAT
- STL
1 stop5h 01m
Delta
Fri 5/16:50 pm
STL
- SAT
1 stop5h 56m
Delta
Deal found 3/31![Delta logo]()
$305
This United Airlines deal was found by Cheapflights users on 4/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:47 am
SAT
- ORD
Nonstop2h 58m
United Airlines
Tue 5/267:58 pm
ORD
- SAT
Nonstop2h 59m
United Airlines
Deal found 4/2![United Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 4/2. 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 4/247:20 am
SAT
- STL
Nonstop2h 10m
Southwest
Mon 4/279:45 pm
STL
- SAT
Nonstop2h 20m
Southwest
Deal found 4/2![Southwest logo]()
$307
This American Airlines deal was found by Cheapflights users on 4/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/65:00 am
SAT
- PIA
1 stop6h 42m
American Airlines
Wed 5/135:40 pm
PIA
- SAT
1 stop5h 12m
American Airlines
Deal found 4/2![American Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 4/3. 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.
Sat 5/22:00 pm
SAT
- ORD
Nonstop2h 55m
United Airlines
Sat 5/93:00 pm
ORD
- SAT
1 stop5h 49m
United Airlines
Deal found 4/3![United Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 4/4. 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.
Thu 5/2811:50 am
SAT
- MDW
1 stop6h 43m
Delta
Tue 6/25:15 pm
MDW
- SAT
1 stop7h 29m
Delta
Deal found 4/4![Delta logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/152:12 pm
SAT
- RFD
2 stops19h 35m
Multiple Airlines
Sun 4/1910:37 am
RFD
- SAT
1 stop13h 14m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$378
This Southwest deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/285:40 pm
SAT
- MDW
1 stop4h 05m
Southwest
Tue 5/510:15 am
MDW
- SAT
2 stops7h 05m
Southwest
Deal found 3/31![Southwest logo]()
$318
This Delta deal was found by Cheapflights users on 4/2. 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.
Mon 5/46:20 am
SAT
- BMI
1 stop4h 59m
Delta
Mon 5/114:14 pm
BMI
- SAT
1 stop6h 17m
Delta
Deal found 4/2![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Wed 9/21:40 pm
SAT
- ORD
Nonstop2h 59m
United Airlines
Tue 9/81:07 pm
ORD
- SAT
Nonstop3h 01m
United Airlines
Deal found 4/1![United Airlines logo]()
$332
This American Airlines deal was found by Cheapflights users on 4/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/216:27 pm
SAT
- BMI
1 stop5h 32m
American Airlines
Mon 5/256:02 pm
BMI
- SAT
1 stop5h 59m
American Airlines
Deal found 4/1![American Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/284:55 pm
SAT
- ORD
1 stop7h 00m
Southwest
Tue 5/511:55 am
ORD
- SAT
2 stops9h 50m
Southwest
Deal found 3/31![Southwest logo]()
$322
This Kiwi.com deal was found by Cheapflights users on 4/3. 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.
Sat 6/206:00 am
SAT
- RFD
1 stop28h 37m
Multiple Airlines
Thu 7/911:27 am
RFD
- SAT
2 stops23h 23m
Multiple Airlines
Deal found 4/3![Multiple Airlines logo]()
$393
This Delta deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/228:00 am
SAT
- BMI
1 stop7h 37m
Delta
Mon 4/274:20 pm
BMI
- SAT
1 stop6h 05m
Delta
Deal found 3/31![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/105:18 pm
SAT
- MLI
1 stop5h 13m
United Airlines
Tue 6/162:31 pm
MLI
- SAT
2 stops8h 11m
United Airlines
Deal found 3/30![United Airlines logo]()
$338
This American Airlines deal was found by Cheapflights users on 4/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:42 pm
SAT
- PIA
1 stop6h 10m
American Airlines
Tue 4/211:22 pm
PIA
- SAT
2 stops8h 39m
American Airlines
Deal found 4/2![American Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 4/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/25:05 am
SAT
- MDW
2 stops8h 40m
Southwest
Sat 5/96:15 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 4/3![Southwest logo]()
$324
This American Airlines deal was found by Cheapflights users on 4/3. 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 4/1510:27 am
SAT
- BMI
1 stop4h 48m
American Airlines
Thu 4/233:45 pm
BMI
- SAT
1 stop5h 57m
American Airlines
Deal found 4/3![American Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 4/3. 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.
Tue 6/166:40 am
SAT
- MLI
1 stop7h 16m
United Airlines
Mon 6/223:52 pm
MLI
- SAT
1 stop7h 02m
United Airlines
Deal found 4/3![United Airlines logo]()
$348
This Delta deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 9/46:15 pm
SAT
- STL
1 stop5h 22m
Delta
Tue 9/86:00 am
STL
- SAT
1 stop5h 10m
Delta
Deal found 3/31![Delta logo]()
$355
This Southwest deal was found by Cheapflights users on 4/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/84:45 pm
SAT
- STL
Nonstop2h 10m
Southwest
Sun 5/106:35 pm
STL
- SAT
1 stop7h 20m
Southwest
Deal found 4/3![Southwest logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/219:55 am
SAT
- RFD
2 stops21h 50m
Multiple Airlines
Sun 5/2411:27 am
RFD
- SAT
1 stop28h 49m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$449
This American Airlines deal was found by Cheapflights users on 4/3. 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.
Thu 4/236:26 am
SAT
- CMI
1 stop7h 42m
American Airlines
Wed 5/66:58 pm
CMI
- SAT
1 stop5h 01m
American Airlines
Deal found 4/3![American Airlines logo]()
$390
This United Airlines deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/115:18 pm
SAT
- MLI
1 stop6h 41m
United Airlines
Tue 6/162:31 pm
MLI
- SAT
2 stops8h 11m
United Airlines
Deal found 3/30![United Airlines logo]()
$359
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated April 4, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated April 4, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” 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 4/116:45 am
SAT
- ORD
1 stop17h 53m
Frontier
Mon 4/135:15 am
ORD
- SAT
1 stop11h 50m
Frontier
Deal found 3/30![Frontier logo]()
$232
This CheapOair deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/173:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Sun 4/199:55 pm
STL
- SAT
1 stop19h 36m
Frontier
Deal found 3/31![Frontier logo]()
$191
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:04 pm
SAT
- STL
1 stop27h 17m
Frontier
Mon 4/208:17 pm
STL
- SAT
1 stop18h 52m
Frontier
Deal found 4/1![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 4/3. 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.
Thu 4/233:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Mon 4/278:17 pm
STL
- SAT
1 stop18h 52m
Frontier
Deal found 4/3![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 4/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/243:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Mon 4/278:17 pm
STL
- SAT
1 stop18h 52m
Frontier
Deal found 4/1![Frontier logo]()
$182
This Expedia deal was found by Cheapflights users on 4/2. 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.
Thu 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Thu 5/712:36 pm
STL
- SAT
1 stop7h 38m
Frontier
Deal found 4/2![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/306:00 am
SAT
- ORD
1 stop15h 17m
Multiple Airlines
Mon 5/119:42 pm
ORD
- SAT
1 stop21h 17m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$226
This CheapOair deal was found by Cheapflights users on 4/2. 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.
Tue 5/58:59 pm
SAT
- STL
1 stop21h 07m
Frontier
Thu 5/712:36 pm
STL
- SAT
1 stop7h 38m
Frontier
Deal found 4/2![Frontier logo]()
$151
This CheapOair deal was found by Cheapflights users on 4/3. 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 5/87:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Tue 5/126:51 pm
STL
- SAT
1 stop25h 23m
Frontier
Deal found 4/3![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/187:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
Mon 6/19:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/31![Frontier logo]()
$227
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/187:54 pm
SAT
- ORD
2 stops19h 09m
Multiple Airlines
Wed 6/39:42 pm
ORD
- SAT
1 stop21h 17m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/197:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
Tue 6/26:55 am
ORD
- SAT
2 stops12h 04m
Frontier
Deal found 3/31![Frontier logo]()
$235
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 April 4, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated April 4, 2026.
This CheapOair deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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.
Mon 5/46:31 pm
SAT
- STL
1 stop23h 35m
Frontier
Deal found 3/31![Frontier logo]()
$82
This Expedia deal was found by Cheapflights users on 4/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Deal found 4/1![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 4/3. 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 6/307:51 pm
SAT
- STL
1 stop23h 32m
Frontier
Deal found 4/3![Frontier logo]()
$106
This CheapOair deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 6/108:56 pm
SAT
- STL
1 stop22h 40m
Frontier
Deal found 3/31![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 5/13:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Deal found 3/31![Frontier logo]()
$117
This Trip.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/31![Frontier logo]()
$120
This CheapOair deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/317:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 3/31![Frontier logo]()
$123
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/284:04 pm
SAT
- STL
2 stops31h 15m
Frontier
Deal found 3/31![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” 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 5/18:25 pm
SAT
- MDW
2 stops25h 49m
Frontier
Deal found 3/30![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” 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 4/1410:22 am
SAT
- ORD
1 stop10h 55m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 4/1. 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.
Tue 4/284:04 pm
SAT
- MDW
2 stops46h 28m
Frontier
Deal found 4/1![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” 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 5/18:25 pm
SAT
- ORD
2 stops24h 47m
Multiple Airlines
Deal found 3/30![Multiple Airlines logo]()
$138
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 April 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $151 (CheapOair) |
One-way from | $82 (CheapOair) |
Popular in | December |
Cheapest in | September |
Average price | $366 |
Good round-trip deal | $369 or less |
Good one-way deal | $218 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 April 4, 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
Thu 8/20
8:00 am-2:38 pm
1 stop6h 38m
Lambert-St Louis
Tue 8/25
5:30 pm-12:15 am
1 stop6h 45m
$291
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Wed 5/20
2:35 pm-5:10 pm
Nonstop2h 35m
Chicago Midway
Tue 5/26
9:00 pm-11:50 pm
Nonstop2h 50m
$297
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Tue 5/5
2:35 pm-5:10 pm
Nonstop2h 35m
Chicago Midway
Sat 5/9
10:45 am-1:35 pm
Nonstop2h 50m
$303
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Mon 4/27
6:12 pm-11:13 pm
1 stop5h 01m
Lambert-St Louis
Fri 5/1
6:50 pm-12:46 am
1 stop5h 56m
$305
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Wed 6/3
5:18 pm-8:21 pm
Nonstop3h 03m
Chicago O'Hare Intl
Tue 6/9
2:05 pm-9:13 pm
1 stop7h 08m
$307
San AntonioBloomington
SAT - BMI
SATBMI
San Antonio
Tue 4/28
6:14 pm-11:52 pm
1 stop5h 38m
Bloomington-Normal
Tue 5/5
3:45 pm-10:52 pm
1 stop7h 07m
$307
Quickest round-trip
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Fri 4/24
7:20 am-9:30 am
Nonstop2h 10m
Lambert-St Louis
Mon 4/27
9:45 pm-12:05 am
Nonstop2h 20m
$307
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Sat 5/23
6:47 am-9:45 am
Nonstop2h 58m
Chicago O'Hare Intl
Tue 5/26
7:58 pm-10:57 pm
Nonstop2h 59m
$317
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Tue 4/28
5:40 pm-9:45 pm
1 stop4h 05m
Chicago Midway
Tue 5/5
10:15 am-5:20 pm
2 stops7h 05m
$318
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Sat 5/2
2:00 pm-4:55 pm
Nonstop2h 55m
Chicago O'Hare Intl
Sat 5/9
3:00 pm-8:49 pm
1 stop5h 49m
$319
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-ORD
SAT-MDW
SAT-BMI
SAT-RFD
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Antonio to Illinois
SAT-USIL
SAT-STL
SAT-ORD
SAT-MDW
SAT-BMI
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 $168). 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 April 4, 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.
Weekly flight availability from San Antonio to Illinois
Explore weekly flight availability from San Antonio to Illinois. 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 April 4, 2026.
The most flights from SAT to USIL are scheduled on a Monday (28 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (8 on average).
How much does it cost to fly round-trip from San Antonio to Illinois?
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 April 4, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest,United Airlines, andAmerican Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
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
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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 April 4, 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 April 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$213 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$143 | Average$274 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$215 | Average$414 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$247 | Average$407 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$397 | FlexibilityNo cancel fee | On-time63% |