$95+ 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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
abr 22 — abr 291
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from San Antonio to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from San Antonio to Illinois
Cheapest
Best
Last-minute
One-way
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 março 23, 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 março 23, 2026.
This CheapOair deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
sex 5/87:54 pm
SAT
- STL
1 stop23h 29m
Frontier
seg 5/119:18 pm
STL
- SAT
1 stop22h 56m
Frontier
Deal found 3/19![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 4/26:45 am
SAT
- STL
1 stop27h 03m
Frontier
seg 4/68:19 pm
STL
- SAT
1 stop28h 00m
Frontier
Deal found 3/18![Frontier logo]()
$185
This CheapOair deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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.
sex 5/13:00 pm
SAT
- STL
1 stop28h 32m
Frontier
dom 5/38:06 pm
STL
- SAT
1 stop18h 09m
Frontier
Deal found 3/21![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qua 4/87:45 am
SAT
- ORD
1 stop6h 34m
Multiple Airlines
seg 4/137:20 am
ORD
- SAT
1 stop26h 07m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$197
This Booking.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
ter 5/57:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
sáb 5/99:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/20![Frontier logo]()
$202
This CheapOair deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 5/18:25 pm
SAT
- ORD
1 stop9h 43m
Frontier
seg 5/48:58 pm
ORD
- SAT
1 stop23h 16m
Frontier
Deal found 3/18![Frontier logo]()
$211
This CheapOair deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qui 4/96:45 am
SAT
- STL
1 stop27h 03m
Frontier
sáb 4/118:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Deal found 3/19![Frontier logo]()
$212
This CheapOair deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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.
qui 5/77:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
ter 5/129:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/23![Frontier logo]()
$212
This Booking.com deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 5/137:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
seg 5/189:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/18![Frontier logo]()
$213
This CheapOair deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
qui 4/910:22 am
SAT
- ORD
1 stop12h 55m
Multiple Airlines
sáb 4/115:53 pm
ORD
- SAT
1 stop6h 26m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$222
This Expedia deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
seg 3/302:13 pm
SAT
- ORD
1 stop9h 25m
Frontier
sex 4/32:29 pm
ORD
- SAT
1 stop9h 50m
Frontier
Deal found 3/20![Frontier logo]()
$225
This CheapOair deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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.
qua 5/67:54 pm
SAT
- ORD
1 stop24h 43m
Frontier
seg 5/119:42 pm
ORD
- SAT
1 stop21h 17m
Frontier
Deal found 3/23![Frontier logo]()
$232
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 março 23, 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 março 23, 2026.
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
seg 4/204:45 pm
SAT
- STL
Nonstop2h 10m
Southwest
seg 4/276:00 pm
STL
- SAT
1 stop6h 30m
Southwest
Deal found 3/22![Southwest logo]()
$251
This United Airlines deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
qui 6/256:40 am
SAT
- STL
1 stop5h 31m
United Airlines
ter 7/75:33 pm
STL
- SAT
1 stop5h 18m
United Airlines
Deal found 3/20![United Airlines logo]()
$291
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
sáb 5/2312:08 pm
SAT
- STL
1 stop5h 52m
Delta
sáb 5/305:15 pm
STL
- SAT
1 stop7h 29m
Delta
Deal found 3/19![Delta logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qua 4/810:22 am
SAT
- RFD
1 stop23h 25m
Multiple Airlines
seg 4/138:35 pm
RFD
- SAT
2 stops43h 18m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
sex 4/176:14 pm
SAT
- BMI
1 stop5h 38m
American Airlines
sex 4/242:46 pm
BMI
- SAT
2 stops8h 06m
American Airlines
Deal found 3/19![American Airlines logo]()
$334
This Delta deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 5/226:21 pm
SAT
- STL
1 stop5h 38m
Delta
ter 5/266:21 am
STL
- SAT
1 stop5h 24m
Delta
Deal found 3/18![Delta logo]()
$291
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
ter 4/216:20 am
SAT
- STL
2 stops6h 40m
Southwest
ter 4/281:25 pm
STL
- SAT
1 stop3h 55m
Southwest
Deal found 3/22![Southwest logo]()
$292
This United Airlines deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 6/194:35 pm
SAT
- STL
1 stop7h 22m
United Airlines
sáb 6/275:33 pm
STL
- SAT
1 stop5h 18m
United Airlines
Deal found 3/18![United Airlines logo]()
$315
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
ter 5/126:30 am
SAT
- STL
1 stop5h 55m
Southwest
sáb 5/168:45 am
STL
- SAT
Nonstop2h 15m
Southwest
Deal found 3/22![Southwest logo]()
$294
This American Airlines deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 4/256:14 pm
SAT
- MLI
1 stop5h 40m
American Airlines
seg 4/276:41 pm
MLI
- SAT
1 stop5h 18m
American Airlines
Deal found 3/18![American Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
ter 4/285:10 am
SAT
- ORD
1 stop5h 09m
Delta
seg 5/46:25 am
ORD
- SAT
1 stop5h 24m
Delta
Deal found 3/19![Delta logo]()
$323
This United Airlines deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 4/106:02 pm
SAT
- ORD
1 stop6h 43m
United Airlines
seg 4/137:59 pm
ORD
- SAT
Nonstop3h 08m
United Airlines
Deal found 3/18![United Airlines logo]()
$323
This Southwest deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
sex 5/84:45 pm
SAT
- STL
Nonstop2h 10m
Southwest
seg 5/119:45 pm
STL
- SAT
Nonstop2h 20m
Southwest
Deal found 3/19![Southwest logo]()
$297
This American Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 5/210:27 am
SAT
- MLI
2 stops7h 40m
American Airlines
sáb 5/912:49 pm
MLI
- SAT
2 stops6h 55m
American Airlines
Deal found 3/23![American Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 4/174:17 pm
SAT
- ORD
1 stop5h 14m
United Airlines
sex 4/241:00 pm
ORD
- SAT
Nonstop3h 09m
United Airlines
Deal found 3/18![United Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
sex 4/176:20 am
SAT
- BMI
1 stop4h 59m
Delta
sex 4/244:20 pm
BMI
- SAT
1 stop6h 05m
Delta
Deal found 3/19![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 4/1811:50 am
SAT
- MDW
Nonstop2h 35m
Southwest
seg 4/279:40 pm
MDW
- SAT
Nonstop2h 50m
Southwest
Deal found 3/19![Southwest logo]()
$309
This Delta deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 4/226:20 am
SAT
- BMI
1 stop4h 59m
Delta
seg 4/274:20 pm
BMI
- SAT
1 stop6h 05m
Delta
Deal found 3/18![Delta logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
qua 6/246:00 am
SAT
- RFD
1 stop28h 37m
Multiple Airlines
dom 6/2811:27 am
RFD
- SAT
2 stops24h 23m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$446
This United Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qua 6/105:18 pm
SAT
- MLI
1 stop5h 13m
United Airlines
qua 6/173:52 pm
MLI
- SAT
1 stop7h 02m
United Airlines
Deal found 3/19![United Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 5/133:45 pm
SAT
- MDW
1 stop6h 30m
Southwest
seg 5/185:55 pm
MDW
- SAT
1 stop6h 20m
Southwest
Deal found 3/18![Southwest logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 4/810:22 am
SAT
- RFD
1 stop23h 25m
Multiple Airlines
qui 4/912:50 pm
RFD
- SAT
2 stops11h 29m
Multiple Airlines
Deal found 3/18![Multiple Airlines logo]()
$457
This United Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
ter 5/196:49 am
SAT
- PIA
1 stop6h 08m
United Airlines
ter 6/22:39 pm
PIA
- SAT
2 stops8h 03m
United Airlines
Deal found 3/19![United Airlines logo]()
$344
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
dom 6/74:20 pm
SAT
- STL
1 stop7h 35m
Southwest
dom 6/146:25 am
STL
- SAT
1 stop5h 00m
Southwest
Deal found 3/22![Southwest logo]()
$326
This Delta deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 5/226:21 pm
SAT
- ORD
1 stop5h 38m
Delta
ter 5/269:25 am
ORD
- SAT
1 stop6h 27m
Delta
Deal found 3/18![Delta logo]()
$372
This United Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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.
qua 5/136:02 pm
SAT
- ORD
1 stop6h 43m
United Airlines
sáb 5/167:45 pm
ORD
- SAT
Nonstop3h 09m
United Airlines
Deal found 3/21![United Airlines logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 7/116:00 am
SAT
- RFD
1 stop28h 37m
Multiple Airlines
dom 7/1911:27 am
RFD
- SAT
2 stops23h 23m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$471
This American Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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.
ter 4/73:11 pm
SAT
- EVV
2 stops8h 43m
American Airlines
sáb 4/116:41 am
EVV
- SAT
1 stop6h 01m
American Airlines
Deal found 3/23![American Airlines logo]()
$480
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
qua 4/295:40 pm
SAT
- MDW
1 stop4h 05m
Southwest
sáb 5/210:30 am
MDW
- SAT
2 stops5h 50m
Southwest
Deal found 3/22![Southwest logo]()
$358
This Kiwi.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
qua 7/296:00 am
SAT
- RFD
1 stop28h 37m
Multiple Airlines
dom 8/211:27 am
RFD
- SAT
1 stop12h 22m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$482
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated março 23, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated março 23, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
ter 3/241:22 pm
SAT
- ORD
1 stop6h 41m
Multiple Airlines
dom 4/1212:00 pm
ORD
- SAT
1 stop21h 27m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$233
This Expedia deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
sex 3/2710:05 am
SAT
- STL
1 stop23h 44m
Frontier
dom 3/297:52 am
STL
- SAT
1 stop29h 31m
Frontier
Deal found 3/22![Frontier logo]()
$240
This Expedia deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
seg 3/302:13 pm
SAT
- ORD
1 stop9h 25m
Frontier
sex 4/32:29 pm
ORD
- SAT
1 stop9h 50m
Frontier
Deal found 3/20![Frontier logo]()
$225
This Kiwi.com deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 4/26:45 am
SAT
- STL
1 stop27h 03m
Frontier
seg 4/68:19 pm
STL
- SAT
1 stop28h 00m
Frontier
Deal found 3/18![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qua 4/87:45 am
SAT
- ORD
1 stop6h 34m
Multiple Airlines
seg 4/137:20 am
ORD
- SAT
1 stop26h 07m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qua 4/87:45 am
SAT
- ORD
1 stop6h 34m
Frontier
ter 4/143:27 pm
ORD
- SAT
2 stops24h 26m
Frontier
Deal found 3/19![Frontier logo]()
$211
This Priceline deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
qua 4/810:22 am
SAT
- ORD
1 stop9h 29m
Multiple Airlines
qui 4/97:55 am
ORD
- SAT
1 stop7h 56m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$237
This CheapOair deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qui 4/96:45 am
SAT
- STL
1 stop27h 03m
Frontier
sáb 4/118:16 pm
STL
- SAT
1 stop28h 03m
Frontier
Deal found 3/19![Frontier logo]()
$212
This CheapOair deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
qui 4/910:22 am
SAT
- ORD
1 stop12h 55m
Multiple Airlines
sáb 4/115:53 pm
ORD
- SAT
1 stop6h 26m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$222
This CheapOair deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
seg 4/1311:38 am
SAT
- ORD
1 stop18h 42m
Frontier
sex 4/176:04 pm
ORD
- SAT
1 stop23h 31m
Frontier
Deal found 3/19![Frontier logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 4/1410:22 am
SAT
- ORD
1 stop23h 14m
Multiple Airlines
qua 4/156:08 pm
ORD
- SAT
2 stops39h 16m
Multiple Airlines
Deal found 3/18![Multiple Airlines logo]()
$238
This CheapOair deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 4/154:49 pm
SAT
- STL
1 stop26h 32m
Frontier
sáb 4/188:17 pm
STL
- SAT
1 stop17h 56m
Frontier
Deal found 3/18![Frontier logo]()
$236
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 março 23, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated março 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qui 4/163:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Deal found 3/19![Frontier logo]()
$95
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
qua 4/229:40 am
SAT
- STL
1 stop5h 10m
Southwest
Deal found 3/22![Southwest logo]()
$98
This CheapOair deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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.
qui 4/303:00 pm
SAT
- STL
1 stop28h 21m
Frontier
Deal found 3/23![Frontier logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
sex 4/173:00 pm
SAT
- STL
1 stop28h 32m
Frontier
Deal found 3/19![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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.
ter 5/197:54 pm
SAT
- STL
2 stops13h 01m
Frontier
Deal found 3/23![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
sex 5/157:54 pm
SAT
- STL
1 stop23h 29m
Frontier
Deal found 3/19![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
qua 4/224:49 pm
SAT
- STL
1 stop26h 32m
Frontier
Deal found 3/22![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
seg 4/201:51 pm
SAT
- STL
1 stop9h 28m
Frontier
Deal found 3/22![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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.
qua 4/154:49 pm
SAT
- ORD
2 stops17h 34m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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.
sex 4/173:00 pm
SAT
- MDW
2 stops31h 14m
Frontier
Deal found 3/21![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
ter 5/197:54 pm
SAT
- MDW
2 stops18h 18m
Frontier
Deal found 3/20![Frontier logo]()
$138
This Super.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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.
sex 3/2710:05 am
SAT
- ORD
1 stop14h 52m
Frontier
Deal found 3/22![Frontier logo]()
$139
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 março 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $171 (CheapOair) |
One-way from | $95 (Kiwi.com) |
Popular in | December |
Cheapest in | September |
Average price | $393 |
Good round-trip deal | $369 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 março 23, 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
seg 4/20
4:45 pm-6:55 pm
Nonstop2h 10m
Lambert-St Louis
seg 4/27
6:00 pm-12:30 am
1 stop6h 30m
$251
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
qui 6/25
6:40 am-12:11 pm
1 stop5h 31m
Lambert-St Louis
ter 7/7
5:33 pm-10:51 pm
1 stop5h 18m
$291
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
sáb 5/23
12:08 pm-6:00 pm
1 stop5h 52m
Lambert-St Louis
sáb 5/30
5:15 pm-12:44 am
1 stop7h 29m
$291
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
sex 5/22
6:21 pm-11:59 pm
1 stop5h 38m
Lambert-St Louis
ter 5/26
6:21 am-11:45 am
1 stop5h 24m
$291
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
ter 4/21
6:20 am-1:00 pm
2 stops6h 40m
Lambert-St Louis
ter 4/28
1:25 pm-5:20 pm
1 stop3h 55m
$292
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
ter 5/12
6:30 am-12:25 pm
1 stop5h 55m
Lambert-St Louis
sáb 5/16
8:45 am-11:00 am
Nonstop2h 15m
$294
Quickest round-trip
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
sex 5/8
4:45 pm-6:55 pm
Nonstop2h 10m
Lambert-St Louis
seg 5/11
9:45 pm-12:05 am
Nonstop2h 20m
$297
San AntonioChicago
SAT - MDW
SATMDW
San Antonio
sáb 4/18
11:50 am-2:25 pm
Nonstop2h 35m
Chicago Midway
seg 4/27
9:40 pm-12:30 am
Nonstop2h 50m
$309
San AntonioSt. Louis
SAT - STL
SATSTL
San Antonio
sex 6/19
4:35 pm-11:57 pm
1 stop7h 22m
Lambert-St Louis
sáb 6/27
5:33 pm-10:51 pm
1 stop5h 18m
$315
San AntonioChicago
SAT - RFD
SATRFD
San Antonio
qua 4/8
10:22 am-9:47 am
1 stop23h 25m
Chicago Greater Rockford
seg 4/13
8:35 pm-3:53 pm
2 stops43h 18m
$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-RFD
SAT-BMI
SAT-MLI
SAT-ORD
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-RFD
SAT-BMI
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 $158). 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 março 23, 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 março 23, 2026.
The most flights from SAT to USIL are scheduled on a Sunday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 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 março 23, 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.
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for San Antonio to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
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 março 23, 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 março 23, 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$415 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$247 | Average$410 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$400 | FlexibilityNo cancel fee | On-time63% |