$77+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Apr 9 — Apr 161
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 10, 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 10, 2026.
This CheapOair 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 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
Sun 5/38:06 pm
STL
- SAT
1 stop18h 09m
Frontier
Deal found 3/5![Frontier logo]()
$171
This Booking.com deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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
Mon 4/2010:55 am
ORD
- SAT
1 stop28h 14m
Frontier
Deal found 3/10![Frontier logo]()
$201
This Expedia deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:45 am
SAT
- STL
1 stop27h 04m
Frontier
Sat 3/288:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Deal found 3/9![Frontier logo]()
$205
This Booking.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/3010:05 am
SAT
- ORD
1 stop14h 52m
Frontier
Wed 4/13:29 pm
ORD
- SAT
1 stop8h 50m
Frontier
Deal found 3/9![Frontier logo]()
$206
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.
Wed 4/154:49 pm
SAT
- ORD
1 stop17h 01m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$210
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.
Sat 5/93:34 pm
SAT
- ORD
1 stop18h 16m
Multiple Airlines
Tue 5/124:28 pm
ORD
- SAT
2 stops20h 49m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$214
This Expedia deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1110:23 am
SAT
- STL
1 stop12h 56m
Frontier
Thu 5/149:55 pm
STL
- SAT
1 stop13h 45m
Frontier
Deal found 3/9![Frontier logo]()
$215
This Expedia deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/810:22 am
SAT
- ORD
1 stop9h 29m
Multiple Airlines
Mon 4/132:29 pm
ORD
- SAT
1 stop24h 40m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 pm
SAT
- ORD
1 stop23h 00m
Frontier
Mon 4/2010:55 am
ORD
- SAT
1 stop28h 14m
Frontier
Deal found 3/9![Frontier logo]()
$217
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.
Tue 4/1410:22 am
SAT
- ORD
1 stop9h 29m
Multiple Airlines
Mon 4/208:58 pm
ORD
- SAT
2 stops18h 11m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$220
This Expedia deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1710:23 am
SAT
- ORD
1 stop29h 00m
Frontier
Mon 4/2010:55 am
ORD
- SAT
1 stop28h 14m
Frontier
Deal found 3/10![Frontier logo]()
$221
This Expedia deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:31 pm
SAT
- ORD
1 stop12h 16m
Frontier
Wed 5/69:18 pm
ORD
- SAT
1 stop14h 22m
Frontier
Deal found 3/6![Frontier logo]()
$222
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 10, 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 10, 2026.
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.
Thu 8/208:00 am
SAT
- STL
1 stop6h 38m
Delta
Tue 8/257:20 am
STL
- SAT
1 stop7h 56m
Delta
Deal found 3/5![Delta logo]()
$247
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:02 pm
SAT
- STL
1 stop4h 26m
United Airlines
Fri 5/16:00 am
STL
- SAT
1 stop4h 47m
United Airlines
Deal found 3/7![United Airlines logo]()
$270
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 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/15:00 am
SAT
- MLI
2 stops8h 21m
American Airlines
Sun 4/56:00 am
MLI
- SAT
2 stops8h 18m
American Airlines
Deal found 3/7![American Airlines logo]()
$345
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 6/47:26 pm
SAT
- RFD
2 stops24h 54m
Multiple Airlines
Sun 6/711:27 am
RFD
- SAT
1 stop12h 24m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$370
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 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:37 am
SAT
- STL
1 stop4h 31m
United Airlines
Thu 8/205:10 am
STL
- SAT
1 stop7h 33m
United Airlines
Deal found 3/7![United Airlines logo]()
$271
This Southwest deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/305:25 pm
SAT
- MDW
1 stop6h 40m
Southwest
Sat 4/410:05 am
MDW
- SAT
2 stops6h 15m
Southwest
Deal found 3/8![Southwest logo]()
$302
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/305:30 pm
SAT
- ORD
Nonstop2h 56m
United Airlines
Sat 4/42:00 pm
ORD
- SAT
1 stop6h 42m
United Airlines
Deal found 3/8![United Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/3110:45 am
SAT
- STL
1 stop5h 13m
Delta
Mon 8/35:30 pm
STL
- SAT
1 stop6h 44m
Delta
Deal found 3/9![Delta logo]()
$291
This Southwest deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/145:40 pm
SAT
- MDW
1 stop4h 05m
Southwest
Sat 4/186:15 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 3/6![Southwest logo]()
$303
This Delta deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:20 pm
SAT
- STL
1 stop5h 18m
Delta
Mon 6/156:00 am
STL
- SAT
1 stop7h 46m
Delta
Deal found 3/10![Delta logo]()
$291
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:49 am
SAT
- MLI
1 stop5h 38m
United Airlines
Mon 4/273:20 pm
MLI
- SAT
1 stop7h 38m
United Airlines
Deal found 3/6![United Airlines logo]()
$299
This Southwest deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/42:10 pm
SAT
- MDW
1 stop6h 40m
Southwest
Thu 5/710:10 am
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 3/6![Southwest logo]()
$321
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/135:34 pm
SAT
- CMI
1 stop6h 29m
United Airlines
Sun 5/175:45 am
CMI
- SAT
1 stop6h 30m
United Airlines
Deal found 3/7![United Airlines logo]()
$303
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 5/192:35 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Thu 5/219:40 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 3/5![Southwest logo]()
$322
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/710:52 am
SAT
- MDW
1 stop5h 20m
Delta
Tue 5/1212:51 pm
MDW
- SAT
1 stop5h 32m
Delta
Deal found 3/6![Delta logo]()
$324
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:25 pm
SAT
- ORD
1 stop5h 47m
United Airlines
Thu 5/149:05 am
ORD
- SAT
Nonstop3h 10m
United Airlines
Deal found 3/8![United Airlines logo]()
$314
This Southwest deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/72:40 pm
SAT
- MDW
Nonstop2h 35m
Southwest
Tue 5/129:00 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 3/6![Southwest logo]()
$322
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:20 am
SAT
- MDW
1 stop5h 47m
Delta
Mon 5/111:59 pm
MDW
- SAT
1 stop7h 33m
Delta
Deal found 3/8![Delta logo]()
$324
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:49 pm
SAT
- ORD
Nonstop2h 56m
United Airlines
Thu 5/72:20 pm
ORD
- SAT
1 stop6h 29m
United Airlines
Deal found 3/6![United Airlines logo]()
$321
This American Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/108:31 pm
SAT
- CMI
1 stop18h 08m
American Airlines
Sun 4/126:58 pm
CMI
- SAT
1 stop5h 01m
American Airlines
Deal found 3/9![American Airlines logo]()
$532
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/34:40 pm
SAT
- STL
Nonstop2h 10m
Southwest
Mon 4/69:45 pm
STL
- SAT
Nonstop2h 25m
Southwest
Deal found 3/7![Southwest logo]()
$339
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.
Thu 8/204:35 pm
SAT
- STL
1 stop7h 15m
United Airlines
Tue 8/2510:24 am
STL
- SAT
2 stops9h 29m
United Airlines
Deal found 3/5![United Airlines logo]()
$322
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2410:50 am
SAT
- MLI
1 stop5h 42m
Delta
Sat 3/285:15 pm
MLI
- SAT
1 stop7h 22m
Delta
Deal found 3/6![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/212:30 pm
SAT
- STL
2 stops5h 25m
Southwest
Mon 6/85:25 pm
STL
- SAT
2 stops6h 05m
Southwest
Deal found 3/6![Southwest logo]()
$346
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.
Thu 4/162:02 pm
SAT
- STL
1 stop7h 11m
United Airlines
Tue 4/217:45 am
STL
- SAT
2 stops12h 03m
United Airlines
Deal found 3/5![United Airlines logo]()
$322
This American Airlines deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/247:00 am
SAT
- CMI
1 stop7h 24m
American Airlines
Sat 3/2812:01 pm
CMI
- SAT
2 stops10h 54m
American Airlines
Deal found 3/10![American Airlines logo]()
$578
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:20 am
SAT
- MDW
1 stop7h 22m
Delta
Thu 5/1410:55 am
MDW
- SAT
1 stop6h 21m
Delta
Deal found 3/9![Delta logo]()
$362
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:05 pm
SAT
- STL
1 stop4h 30m
Southwest
Mon 6/155:25 pm
STL
- SAT
2 stops6h 05m
Southwest
Deal found 3/7![Southwest logo]()
$351
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated March 10, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:45 am
SAT
- STL
1 stop27h 04m
Frontier
Sat 3/288:12 pm
STL
- SAT
1 stop12h 54m
Frontier
Deal found 3/9![Frontier logo]()
$205
This CheapOair deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:45 am
SAT
- STL
1 stop27h 04m
Frontier
Fri 3/278:12 pm
STL
- SAT
1 stop28h 05m
Frontier
Deal found 3/6![Frontier logo]()
$226
This Booking.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/3010:05 am
SAT
- ORD
1 stop14h 52m
Frontier
Wed 4/13:29 pm
ORD
- SAT
1 stop8h 50m
Frontier
Deal found 3/9![Frontier logo]()
$206
This Frontier deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:45 am
SAT
- STL
1 stop27h 03m
Frontier
Mon 4/68:19 pm
STL
- SAT
1 stop28h 00m
Frontier
Deal found 3/9![Frontier logo]()
$224
This Expedia deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/810:22 am
SAT
- ORD
1 stop9h 29m
Multiple Airlines
Mon 4/132:29 pm
ORD
- SAT
1 stop24h 40m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 pm
SAT
- ORD
1 stop23h 00m
Frontier
Mon 4/2010:55 am
ORD
- SAT
1 stop28h 14m
Frontier
Deal found 3/9![Frontier logo]()
$217
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.
Tue 4/1410:22 am
SAT
- ORD
1 stop9h 29m
Multiple Airlines
Mon 4/208:58 pm
ORD
- SAT
2 stops18h 11m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$220
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.
Wed 4/154:49 pm
SAT
- ORD
1 stop17h 01m
Multiple Airlines
Wed 4/221:27 pm
ORD
- SAT
1 stop10h 24m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$210
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.
Wed 4/154:49 pm
SAT
- ORD
1 stop17h 01m
Frontier
Sat 4/185:50 am
ORD
- SAT
2 stops11h 45m
Frontier
Deal found 3/6![Frontier logo]()
$228
This Kiwi.com deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/163:00 pm
SAT
- ORD
1 stop18h 50m
Frontier
Mon 4/208:58 pm
ORD
- SAT
2 stops42h 55m
Frontier
Deal found 3/10![Frontier logo]()
$229
This Expedia deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1710:23 am
SAT
- ORD
1 stop29h 00m
Frontier
Mon 4/2010:55 am
ORD
- SAT
1 stop28h 14m
Frontier
Deal found 3/10![Frontier logo]()
$221
This Booking.com deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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
Mon 4/2010:55 am
ORD
- SAT
1 stop28h 14m
Frontier
Deal found 3/10![Frontier logo]()
$201
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 10, 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 10, 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.
Fri 5/83:14 pm
SAT
- STL
1 stop27h 58m
Frontier
Deal found 3/6![Frontier logo]()
$77
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 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:13 pm
SAT
- STL
1 stop9h 06m
Frontier
Deal found 3/6![Frontier logo]()
$80
This Booking.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:25 pm
SAT
- ORD
1 stop9h 43m
Frontier
Deal found 3/6![Frontier logo]()
$90
This CheapOair deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/77:45 am
SAT
- STL
1 stop26h 03m
Frontier
Deal found 3/8![Frontier logo]()
$92
This Expedia 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 Expedia 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 3/5![Frontier logo]()
$96
This Expedia 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 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 3/5![Frontier logo]()
$96
This Booking.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:45 am
SAT
- ORD
1 stop26h 58m
Frontier
Deal found 3/9![Frontier logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/93:34 pm
SAT
- STL
1 stop27h 38m
Frontier
Deal found 3/9![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/93:34 pm
SAT
- ORD
1 stop18h 16m
Frontier
Deal found 3/9![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:45 am
SAT
- STL
1 stop27h 03m
Frontier
Deal found 3/9![Frontier logo]()
$100
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1410:22 am
SAT
- ORD
1 stop9h 29m
Spirit Airlines
Deal found 3/6![Spirit Airlines logo]()
$100
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 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $171 (CheapOair) |
One-way from | $77 (Kiwi.com) |
Popular in | December |
Cheapest in | September |
Average price | $393 |
Good round-trip deal | $387 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 10, 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
7:20 am-3:16 pm
1 stop7h 56m
$247
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Mon 4/27
6:02 pm-10:28 pm
1 stop4h 26m
Lambert-St Louis
Fri 5/1
6:00 am-10:47 am
1 stop4h 47m
$270
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 AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Wed 8/12
9:37 am-2:08 pm
1 stop4h 31m
Lambert-St Louis
Thu 8/20
5:10 am-12:43 pm
1 stop7h 33m
$271
San AntonioChicago
SAT - ORD
SATORD
San Antonio
Mon 3/30
5:30 pm-8:26 pm
Nonstop2h 56m
Chicago O'Hare Intl
Sat 4/4
2:00 pm-8:42 pm
1 stop6h 42m
$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
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Fri 7/31
10:45 am-3:58 pm
1 stop5h 13m
Lambert-St Louis
Mon 8/3
5:30 pm-12:14 am
1 stop6h 44m
$291
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
Fri 6/12
6:20 pm-11:38 pm
1 stop5h 18m
Lambert-St Louis
Mon 6/15
6:00 am-1:46 pm
1 stop7h 46m
$291
San AntonioMoline
SAT - MLI
SATMLI
San Antonio
Tue 4/21
6:49 am-12:27 pm
1 stop5h 38m
Moline Quad-City
Mon 4/27
3:20 pm-10:58 pm
1 stop7h 38m
$299
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
Mon 3/30
5:25 pm-12:05 am
1 stop6h 40m
Chicago Midway
Sat 4/4
10:05 am-4:20 pm
2 stops6h 15m
$302
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-ORD
SAT-STL
SAT-MDW
SAT-MLI
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-ORD
SAT-STL
SAT-MDW
SAT-MLI
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 $156). 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 10, 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 March 10, 2026.
The most flights from SAT to USIL are scheduled on a Monday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).
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 10, 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.
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
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
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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 10, 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 10, 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$405 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$247 | Average$414 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$396 | FlexibilityNo cancel fee | On-time63% |