$99+ Cheap flights from Illinois to San Antonio (SAT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to San Antonio 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
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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 Illinois to San Antonio
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Cheapest flights from Illinois to San AntonioExplore the most affordable flight options available from Illinois to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
Explore the most affordable flight options available from Illinois to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
This Trip.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/54:26 pm -
1 stop16h 52m
Tue 11/108:20 pm -
1 stop19h 03m
Deal found 9/15![Frontier logo]()
$263
This Priceline deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/49:50 am -
1 stop10h 22m
Mon 12/712:00 pm -
1 stop6h 54m
Deal found 9/12![Frontier logo]()
$264
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/38:50 pm -
Nonstop2h 50m
Sat 11/77:45 am -
1 stop5h 45m
Deal found 9/16![Southwest logo]()
$272
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/161:30 pm -
1 stop8h 19m
Fri 10/238:21 pm -
1 stop22h 36m
Deal found 9/15![Frontier logo]()
$272
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 12/56:25 pm -
Nonstop2h 55m
Tue 12/84:35 pm -
1 stop6h 30m
Deal found 9/13![Southwest logo]()
$273
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
Sat 10/36:30 am -
1 stop12h 55m
Mon 10/59:50 pm -
1 stop7h 48m
Deal found 9/11![Frontier logo]()
$274
This Super.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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.
Wed 10/286:30 am -
1 stop12h 55m
Sun 11/18:20 pm -
1 stop28h 01m
Deal found 9/14![Frontier logo]()
$275
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/65:40 am -
1 stop4h 06m
Sat 10/106:38 pm -
1 stop5h 41m
Deal found 9/16![American Airlines logo]()
$275
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/146:30 am -
1 stop12h 56m
Wed 10/218:21 pm -
1 stop28h 03m
Deal found 9/14![Frontier logo]()
$276
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/48:50 pm -
Nonstop2h 55m
Sat 11/76:35 am -
2 stops7h 55m
Deal found 9/16![Southwest logo]()
$276
This Trip.com deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” 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 12/36:05 pm -
1 stop26h 07m
Mon 12/712:00 pm -
1 stop6h 54m
Deal found 9/12![Frontier logo]()
$276
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:30 am -
1 stop12h 56m
Fri 10/2310:34 pm -
2 stops25h 50m
Deal found 9/16![Frontier logo]()
$277
Best flights from Illinois to San AntonioDiscover carefully curated flight deals from Illinois to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from Illinois to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/205:29 pm -
1 stop5h 38m
Sat 10/245:15 am -
1 stop5h 14m
Deal found 9/16![Delta logo]()
$281
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/315:30 am -
1 stop5h 16m
Sat 10/315:57 pm -
1 stop5h 29m
Deal found 9/15![United Airlines logo]()
$281
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/159:20 pm -
Nonstop2h 50m
Thu 10/226:45 pm -
1 stop5h 35m
Deal found 9/16![Southwest logo]()
$311
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:30 am -
2 stops26h 38m
Sat 10/242:47 pm -
2 stops33h 37m
Deal found 9/16![Frontier logo]()
$347
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/64:38 pm -
1 stop7h 21m
Sat 10/106:00 am -
1 stop5h 03m
Deal found 9/14![American Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/128:30 pm -
Nonstop3h 07m
Mon 11/166:34 am -
Nonstop2h 59m
Deal found 9/16![United Airlines logo]()
$301
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 11/178:25 pm -
Nonstop2h 20m
Thu 11/193:20 pm -
Nonstop2h 00m
Deal found 9/14![Southwest logo]()
$318
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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.
Sun 10/255:04 pm -
1 stop7h 29m
Sat 10/316:50 am -
1 stop5h 26m
Deal found 9/14![Delta logo]()
$336
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/165:03 pm -
1 stop6h 55m
Mon 10/196:38 pm -
1 stop5h 33m
Deal found 9/16![American Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/169:45 pm -
Nonstop2h 10m
Mon 10/194:40 pm -
1 stop7h 00m
Deal found 9/14![Southwest logo]()
$325
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/144:26 pm -
1 stop5h 22m
Wed 10/215:30 am -
1 stop5h 56m
Deal found 9/14![Delta logo]()
$339
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/288:13 am -
2 stops9h 50m
Sun 11/15:34 pm -
1 stop5h 25m
Deal found 9/15![United Airlines logo]()
$341
This American Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” 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 10/24:24 pm -
1 stop6h 26m
Mon 10/56:38 pm -
1 stop5h 21m
Deal found 9/12![American Airlines logo]()
$354
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/239:45 pm -
Nonstop2h 10m
Mon 10/267:55 pm -
1 stop4h 45m
Deal found 9/15![Southwest logo]()
$325
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/3011:08 am -
2 stops11h 59m
Tue 11/35:00 pm -
1 stop5h 30m
Deal found 9/15![Delta logo]()
$341
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/63:58 pm -
1 stop6h 59m
Sat 10/105:43 pm -
1 stop5h 15m
Deal found 9/16![American Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/68:50 pm -
Nonstop2h 15m
Sat 10/102:20 pm -
1 stop5h 40m
Deal found 9/16![Southwest logo]()
$343
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 9/296:32 am -
1 stop5h 39m
Sat 10/31:12 pm -
1 stop7h 31m
Deal found 9/14![United Airlines logo]()
$399
This American Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/296:48 pm -
1 stop5h 09m
Sat 11/72:55 pm -
1 stop7h 07m
Deal found 9/13![American Airlines logo]()
$375
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 11/249:30 pm -
Nonstop3h 00m
Tue 12/13:20 pm -
1 stop6h 15m
Deal found 9/13![Southwest logo]()
$350
This Delta deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” 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 9/2311:19 am -
1 stop5h 42m
Wed 9/308:00 am -
1 stop8h 22m
Deal found 9/12![Delta logo]()
$401
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/13:41 pm -
2 stops7h 10m
Sun 10/45:30 pm -
1 stop5h 28m
Deal found 9/16![United Airlines logo]()
$404
This Southwest deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” 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 10/101:50 pm -
Nonstop2h 10m
Sat 10/173:45 pm -
1 stop4h 25m
Deal found 9/12![Southwest logo]()
$357
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 9/296:00 am -
2 stops8h 51m
Sat 10/34:27 pm -
1 stop6h 51m
Deal found 9/14![American Airlines logo]()
$404
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 9/2911:19 am -
2 stops11h 25m
Sat 10/35:15 am -
2 stops11h 14m
Deal found 9/14![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/317:49 pm -
Nonstop3h 08m
Wed 11/46:34 am -
Nonstop2h 58m
Deal found 9/13![United Airlines logo]()
$417
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 11/139:50 pm -
Nonstop2h 20m
Sun 11/157:30 am -
Nonstop2h 05m
Deal found 9/14![Southwest logo]()
$361
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/2912:38 pm -
2 stops9h 22m
Wed 11/49:22 am -
1 stop4h 40m
Deal found 9/15![American Airlines logo]()
$417
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/124:26 pm -
1 stop8h 07m
Sat 10/175:30 am -
1 stop5h 56m
Deal found 9/13![Delta logo]()
$428
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/72:35 pm -
1 stop8h 22m
Fri 11/131:52 pm -
1 stop7h 14m
Deal found 9/15![United Airlines logo]()
$429
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated September 17, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
Sat 10/36:30 am -
1 stop12h 55m
Mon 10/59:50 pm -
1 stop7h 48m
Deal found 9/11![Frontier logo]()
$274
This Frontier deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” 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.
Sat 10/36:30 am -
1 stop12h 55m
Tue 10/63:19 pm -
1 stop14h 19m
Deal found 9/12![Frontier logo]()
$278
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/65:40 am -
1 stop4h 06m
Sat 10/106:38 pm -
1 stop5h 41m
Deal found 9/16![American Airlines logo]()
$275
This CheapOair deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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 10/76:30 am -
1 stop12h 55m
Tue 10/138:21 pm -
1 stop28h 03m
Deal found 9/11![Frontier logo]()
$280
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/106:20 pm -
Nonstop2h 50m
Tue 10/1312:55 pm -
2 stops6h 30m
Deal found 9/16![Southwest logo]()
$276
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/146:30 am -
1 stop12h 56m
Wed 10/218:21 pm -
1 stop28h 03m
Deal found 9/14![Frontier logo]()
$276
This Frontier deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/154:30 pm -
1 stop16h 38m
Mon 10/1910:03 am -
1 stop13h 10m
Deal found 9/13![Frontier logo]()
$279
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/161:30 pm -
1 stop8h 19m
Fri 10/238:21 pm -
1 stop22h 36m
Deal found 9/15![Frontier logo]()
$272
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/161:30 pm -
1 stop8h 19m
Mon 10/1910:03 am -
1 stop13h 10m
Deal found 9/14![Frontier logo]()
$280
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:30 am -
1 stop12h 56m
Fri 10/2310:34 pm -
2 stops25h 50m
Deal found 9/16![Frontier logo]()
$277
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/2110:10 am -
2 stops5h 40m
Wed 10/282:25 pm -
Nonstop2h 40m
Deal found 9/14![Southwest logo]()
$278
This Super.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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.
Wed 10/286:30 am -
1 stop12h 55m
Sun 11/18:20 pm -
1 stop28h 01m
Deal found 9/14![Frontier logo]()
$275
One-way flights from Illinois to San AntonioSearch for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Flightnetwork deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:30 am -
1 stop12h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$99
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/36:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$109
This Priceline deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Tue 12/157:25 am -
1 stop10h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$110
This Priceline deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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.
Wed 12/912:51 pm -
1 stop8h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$111
This CheapOair deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/206:30 am -
1 stop12h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$113
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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.
Sat 10/176:30 am -
1 stop12h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$117
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/146:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/116:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/266:35 pm -
2 stops24h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/166:44 pm -
2 stops24h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$130
Find flight deals from Illinois to San Antonio
Keep the following information in mind while searching for Illinois to San Antonio flight deals. Data was last updated September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $263 (Trip.com) |
One-way from | $99 (Flightnetwork) |
Popular in | August |
Cheapest in | October |
Average price | $365 |
Good round-trip deal | $319 or less |
Good one-way deal | $161 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Antonio that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisSan Antonio
STL Lambert-St Louis - SAT San Antonio
STLSAT
Lambert-St Louis
Wed 11/11
10:00 am-3:27 pm
1 stop5h 27m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$138
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Sat 12/12
1:30 pm-8:00 pm
1 stop6h 30m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$141
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Tue 12/15
8:39 am-4:09 pm
1 stop7h 30m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$141
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Sat 10/17
8:29 am-2:10 pm
1 stop5h 41m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$141
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Thu 10/22
6:00 pm-11:40 pm
1 stop5h 40m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$161
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Thu 11/19
9:55 am-4:20 pm
1 stop6h 25m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$161
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Mon 11/23
5:05 pm-10:54 pm
1 stop5h 49m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$161
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Mon 11/16
9:30 am-4:05 pm
1 stop6h 35m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$161
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Fri 10/23
9:20 pm-12:10 am
Nonstop2h 50m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$170
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Mon 11/23
9:30 pm-12:25 am
Nonstop2h 55m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$170
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to San Antonio
Have a flexible travel schedule? Discover the best time to fly to San Antonio from Illinois with our price prediction graph.
ORD-SAT
MDW-SAT
MLI-SAT
STL-SAT
BMI-SAT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Illinois to San Antonio
USIL-SAT
ORD-SAT
MDW-SAT
MLI-SAT
STL-SAT
What is the cheapest month to book a flight from Illinois to San Antonio?
Currently, January is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $362). Flying from Illinois to San Antonio in March is currently the most expensive (average of $440). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from IL to SAT?
Find hourly flight availability from Illinois to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2026.
It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 4% on the cost of your flight, compared to a flight in the afternoon.
Weekly flight availability from Illinois to San Antonio
Explore weekly flight availability from Illinois to San Antonio. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 17, 2026.
The most flights from USIL to SAT are scheduled on a Wednesday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 on average).
How much does it cost to fly round-trip from Illinois to San Antonio?
Airfare is below average for this route at the moment.
Illinois to San Antonio flights typically cost between $297 and $533 in October.The cheapest round-trip price found within the last 5 days was $274 on Frontier (Oct 20-Oct 29).
How far ahead should I book a flight from Illinois to San Antonio?
Booking 48 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to San Antonio. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Illinois to San Antonio?
Use this chart to determine the cheapest time to fly round-trip from Illinois to San Antonio. Price data was last updated on September 12, 2026.
Travelers seeking maximum savings on their Illinois to San Antonio flight should consider departing on Friday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Antonio. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to San Antonio
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Complete your trip
Complete your trip to San Antonio by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to San Antonio by cabin class
Find flights from Illinois to San Antonio, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and San Antonio flights
Browse other Illinois and San Antonio flight options. Last updated on September 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Antonio
Explore flights to San Antonio departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Illinois to San Antonio flights
Consider these flights traveling from Illinois to San Antonio.
Top 5 airlines flying from Illinois to San Antonio
Discover the top 5 airlines that operate flights from Illinois to San Antonio. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$232 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$221 | Average$370 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$246 | Average$338 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$258 | Average$403 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$297 | Average$447 | FlexibilityNo cancel fee | On-time63% |