$94+ Cheap flights from Illinois to San Antonio (SAT)
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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Sep 17 — Sep 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
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 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 August 18, 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 August 18, 2026.
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/175:19 pm -
1 stop15h 51m
Mon 9/2112:39 pm -
1 stop22h 53m
Deal found 8/13![Frontier logo]()
$176
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:39 pm -
1 stop14h 31m
Thu 9/178:20 pm -
1 stop22h 57m
Deal found 8/13![Frontier logo]()
$201
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/258:10 pm -
1 stop23h 15m
Wed 9/303:19 pm -
1 stop19h 58m
Deal found 8/13![Frontier logo]()
$210
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:10 pm -
1 stop23h 15m
Mon 9/2110:05 am -
1 stop6h 29m
Deal found 8/13![Frontier logo]()
$212
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:39 pm -
1 stop14h 31m
Sun 9/1312:39 pm -
1 stop22h 38m
Deal found 8/13![Frontier logo]()
$224
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:45 pm -
1 stop26h 44m
Fri 9/410:24 pm -
1 stop19h 26m
Deal found 8/13![Frontier logo]()
$247
This Southwest deal was found by Cheapflights users on 8/13. 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 10/138:50 pm -
Nonstop2h 10m
Tue 10/2011:25 am -
1 stop3h 45m
Deal found 8/13![Southwest logo]()
$256
This Expedia deal was found by Cheapflights users on 8/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:17 pm -
1 stop8h 46m
Mon 9/149:50 pm -
1 stop13h 42m
Deal found 8/16![Frontier logo]()
$258
This deal was found by Cheapflights users on 8/13. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1010:00 am -
1 stop5h 44m
Tue 11/175:30 am -
1 stop5h 45m
Deal found 8/13![Delta logo]()
$263
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/101:30 pm -
Nonstop3h 01m
Sat 9/125:59 pm -
1 stop7h 00m
Deal found 8/17![United Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/148:35 pm -
Nonstop2h 45m
Wed 9/163:30 pm -
1 stop6h 25m
Deal found 8/17![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/67:45 pm -
Nonstop3h 08m
Mon 11/96:37 am -
Nonstop2h 59m
Deal found 8/17![United Airlines logo]()
$268
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 August 18, 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 August 18, 2026.
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/234:40 pm -
1 stop6h 20m
Tue 9/299:25 am -
Nonstop2h 35m
Deal found 8/17![Southwest logo]()
$267
This Delta deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 10/212:35 pm -
1 stop6h 11m
Mon 10/55:15 am -
1 stop7h 24m
Deal found 8/17![Delta logo]()
$288
This American Airlines deal was found by Cheapflights users on 8/15. 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.
Sat 12/56:01 am -
1 stop5h 54m
Sat 12/126:40 pm -
1 stop5h 19m
Deal found 8/15![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/15. 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 9/128:29 am -
1 stop8h 02m
Mon 9/141:00 pm -
1 stop7h 59m
Deal found 8/15![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 8/15. 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.
Wed 10/214:30 pm -
1 stop6h 30m
Sat 10/242:50 pm -
1 stop6h 50m
Deal found 8/15![Southwest logo]()
$277
This Delta deal was found by Cheapflights users on 8/15. 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 12/255:45 pm -
1 stop5h 23m
Fri 1/154:25 pm -
1 stop7h 25m
Deal found 8/15![Delta logo]()
$299
This Southwest deal was found by Cheapflights users on 8/14. 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.
Mon 9/285:50 pm -
1 stop5h 10m
Thu 10/17:55 pm -
1 stop5h 10m
Deal found 8/14![Southwest logo]()
$277
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Wed 9/304:24 pm -
1 stop6h 26m
Sat 10/310:51 am -
1 stop5h 03m
Deal found 8/16![American Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 8/18. 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.
Sat 1/95:00 pm -
1 stop7h 28m
Sat 1/1610:45 am -
1 stop5h 37m
Deal found 8/18![Delta logo]()
$303
This Southwest deal was found by Cheapflights users on 8/16. 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 11/1110:15 am -
2 stops7h 25m
Wed 11/183:30 pm -
1 stop7h 10m
Deal found 8/16![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 8/14. 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.
Thu 11/127:45 pm -
Nonstop3h 08m
Tue 11/176:37 am -
Nonstop2h 59m
Deal found 8/14![United Airlines logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:17 pm -
2 stops20h 14m
Mon 9/145:29 pm -
2 stops19h 53m
Deal found 8/13![Alaska Airlines logo]()
$718
This Delta deal was found by Cheapflights users on 8/13. 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.
Tue 1/55:55 am -
1 stop7h 27m
Tue 1/1910:45 am -
1 stop5h 37m
Deal found 8/13![Delta logo]()
$303
This United Airlines deal was found by Cheapflights users on 8/14. 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.
Sat 9/261:30 pm -
Nonstop3h 00m
Mon 10/56:35 am -
Nonstop3h 00m
Deal found 8/14![United Airlines logo]()
$347
This American Airlines deal was found by Cheapflights users on 8/14. 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.
Sat 8/296:00 am -
1 stop6h 53m
Wed 9/22:45 pm -
1 stop7h 15m
Deal found 8/14![American Airlines logo]()
$352
This Delta deal was found by Cheapflights users on 8/15. 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 10/3012:13 pm -
1 stop7h 35m
Tue 11/35:00 pm -
1 stop5h 36m
Deal found 8/15![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 12/247:45 pm -
Nonstop3h 14m
Sun 12/276:45 am -
Nonstop2h 58m
Deal found 8/17![United Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 8/16. 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 10/35:10 am -
2 stops8h 30m
Wed 10/712:55 pm -
2 stops6h 30m
Deal found 8/16![Southwest logo]()
$343
This American Airlines deal was found by Cheapflights users on 8/15. 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.
Fri 10/303:58 pm -
1 stop6h 59m
Tue 11/34:27 pm -
2 stops7h 32m
Deal found 8/15![American Airlines logo]()
$380
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 1/136:15 am -
1 stop4h 33m
Sat 1/166:43 am -
1 stop5h 23m
Deal found 8/17![United Airlines logo]()
$362
This Delta deal was found by Cheapflights users on 8/15. 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.
Sat 11/1411:28 am -
1 stop8h 27m
Thu 11/196:40 am -
1 stop5h 10m
Deal found 8/15![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 8/16. 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 9/3010:30 am -
2 stops6h 20m
Wed 10/712:55 pm -
2 stops6h 30m
Deal found 8/16![Southwest logo]()
$343
This United Airlines deal was found by Cheapflights users on 8/15. 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 2/36:15 am -
1 stop4h 33m
Sat 2/64:20 pm -
2 stops6h 49m
Deal found 8/15![United Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 8/15. 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.
Wed 2/36:55 pm -
Nonstop2h 20m
Sat 2/67:35 am -
Nonstop2h 00m
Deal found 8/15![Southwest logo]()
$357
This Delta deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 10/87:20 pm -
1 stop5h 13m
Sat 10/107:50 am -
1 stop5h 30m
Deal found 8/17![Delta logo]()
$367
This American Airlines deal was found by Cheapflights users on 8/13. 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.
Fri 11/612:17 pm -
1 stop7h 05m
Wed 11/115:00 am -
1 stop6h 47m
Deal found 8/13![American Airlines logo]()
$447
This United Airlines deal was found by Cheapflights users on 8/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:45 pm -
Nonstop3h 15m
Sun 12/2011:48 am -
1 stop4h 32m
Deal found 8/12![United Airlines logo]()
$390
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 1/136:55 pm -
Nonstop2h 20m
Sat 1/167:35 am -
Nonstop2h 00m
Deal found 8/17![Southwest logo]()
$357
This American Airlines deal was found by Cheapflights users on 8/15. 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.
Fri 1/157:01 am -
1 stop6h 10m
Tue 1/195:37 pm -
1 stop5h 45m
Deal found 8/15![American Airlines logo]()
$447
This Delta deal was found by Cheapflights users on 8/16. 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.
Wed 12/168:29 am -
1 stop7h 36m
Sun 12/206:15 pm -
1 stop5h 35m
Deal found 8/16![Delta logo]()
$375
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated August 18, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated August 18, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:45 pm -
1 stop26h 44m
Fri 9/410:24 pm -
1 stop19h 26m
Deal found 8/13![Frontier logo]()
$247
This CheapOair deal was found by Cheapflights users on 8/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/44:23 pm -
1 stop16h 33m
Mon 9/710:24 pm -
1 stop19h 26m
Deal found 8/12![Frontier logo]()
$237
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:39 pm -
1 stop14h 31m
Thu 9/178:20 pm -
1 stop22h 57m
Deal found 8/13![Frontier logo]()
$201
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:39 pm -
1 stop14h 31m
Sun 9/1312:39 pm -
1 stop22h 38m
Deal found 8/13![Frontier logo]()
$224
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/101:30 pm -
Nonstop3h 01m
Sat 9/125:59 pm -
1 stop7h 00m
Deal found 8/17![United Airlines logo]()
$267
This Expedia deal was found by Cheapflights users on 8/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:17 pm -
1 stop8h 46m
Mon 9/149:50 pm -
1 stop13h 42m
Deal found 8/16![Frontier logo]()
$258
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/118:10 pm -
1 stop23h 15m
Sun 9/1312:39 pm -
1 stop22h 38m
Deal found 8/13![Frontier logo]()
$260
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/148:35 pm -
Nonstop2h 45m
Wed 9/163:30 pm -
1 stop6h 25m
Deal found 8/17![Southwest logo]()
$267
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/175:19 pm -
1 stop15h 51m
Mon 9/2112:39 pm -
1 stop22h 53m
Deal found 8/13![Frontier logo]()
$176
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:10 pm -
1 stop23h 15m
Mon 9/2110:05 am -
1 stop6h 29m
Deal found 8/13![Frontier logo]()
$212
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/229:06 pm -
Nonstop2h 49m
Fri 9/256:48 pm -
Nonstop3h 12m
Deal found 8/17![American Airlines logo]()
$268
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/258:10 pm -
1 stop23h 15m
Wed 9/303:19 pm -
1 stop19h 58m
Deal found 8/13![Frontier logo]()
$210
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 August 18, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated August 18, 2026.
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/128:10 pm -
1 stop14h 02m
Deal found 8/13![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/156:30 am -
1 stop12h 55m
Deal found 8/17![Frontier logo]()
$95
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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.
Mon 9/1412:26 pm -
1 stop6h 59m
Deal found 8/17![Frontier logo]()
$100
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 10/236:30 am -
1 stop12h 56m
Deal found 8/17![Frontier logo]()
$106
This Expedia deal was found by Cheapflights users on 8/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:00 pm -
1 stop23h 26m
Deal found 8/13![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 8/14. 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.
Fri 9/118:10 pm -
1 stop23h 15m
Deal found 8/14![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 8/14. 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.
Mon 9/142:29 pm -
2 stops23h 51m
Deal found 8/14![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 8/13. 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.
Fri 10/91:30 pm -
1 stop8h 19m
Deal found 8/13![Frontier logo]()
$119
This Frontier deal was found by Cheapflights users on 8/14. 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 11/61:02 pm -
1 stop7h 54m
Deal found 8/14![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 8/13. 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.
Fri 11/137:00 am -
1 stop13h 56m
Deal found 8/13![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:00 am -
2 stops37h 26m
Deal found 8/13![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1110:35 am -
2 stops32h 26m
Deal found 8/13![Frontier logo]()
$128
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 August 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $176 (CheapOair) |
One-way from | $94 (CheapOair) |
Popular in | August |
Cheapest in | October |
Average price | $433 |
Good round-trip deal | $360 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 2,558,603 searches. Data last updated August 18, 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
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Wed 9/23
4:40 pm-11:00 pm
1 stop6h 20m
San Antonio
Tue 9/29
9:25 am-12:00 pm
Nonstop2h 35m
$267
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Wed 10/21
4:30 pm-11:00 pm
1 stop6h 30m
San Antonio
Sat 10/24
2:50 pm-9:40 pm
1 stop6h 50m
$277
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Mon 9/28
5:50 pm-11:00 pm
1 stop5h 10m
San Antonio
Thu 10/1
7:55 pm-1:05 am
1 stop5h 10m
$277
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Wed 11/11
10:15 am-5:40 pm
2 stops7h 25m
San Antonio
Wed 11/18
3:30 pm-10:40 pm
1 stop7h 10m
$282
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Fri 10/2
12:35 pm-6:46 pm
1 stop6h 11m
San Antonio
Mon 10/5
5:15 am-12:39 pm
1 stop7h 24m
$288
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Fri 12/25
5:45 pm-11:08 pm
1 stop5h 23m
San Antonio
Fri 1/15
4:25 pm-11:50 pm
1 stop7h 25m
$299
MolineSan Antonio
MLI Moline Quad-City - SAT San Antonio
MLISAT
Moline Quad-City
Sat 1/9
5:00 pm-12:28 am
1 stop7h 28m
San Antonio
Sat 1/16
10:45 am-4:22 pm
1 stop5h 37m
$303
MolineSan Antonio
MLI Moline Quad-City - SAT San Antonio
MLISAT
Moline Quad-City
Tue 1/5
5:55 am-1:22 pm
1 stop7h 27m
San Antonio
Tue 1/19
10:45 am-4:22 pm
1 stop5h 37m
$303
BloomingtonSan Antonio
BMI Bloomington-Normal - SAT San Antonio
BMISAT
Bloomington-Normal
Sat 12/5
6:01 am-11:55 am
1 stop5h 54m
San Antonio
Sat 12/12
6:40 pm-11:59 pm
1 stop5h 19m
$319
BloomingtonSan Antonio
BMI Bloomington-Normal - SAT San Antonio
BMISAT
Bloomington-Normal
Wed 9/30
4:24 pm-10:50 pm
1 stop6h 26m
San Antonio
Sat 10/3
10:51 am-3:54 pm
1 stop5h 03m
$319
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.
STL-SAT
ORD-SAT
MDW-SAT
MLI-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
STL-SAT
ORD-SAT
MDW-SAT
MLI-SAT
What is the cheapest month to book a flight from Illinois to San Antonio?
Currently, October is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $352). Flying from Illinois to San Antonio in March is currently the most expensive (average of $443). 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 August 18, 2026.
It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 2% on the cost of your flight, compared to a flight in the morning.
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 August 18, 2026.
The most flights from USIL to SAT are scheduled on a Monday (24 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (17 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 $344 and $591 in September.The cheapest round-trip price found within the last 5 days was $267 on United Airlines (Sep 10-Sep 14).
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 August 15, 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 August 18, 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 August 18, 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 2,558,603 searches. Data last updated August 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$226 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$224 | Average$372 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$361 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$258 | Average$404 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$305 | Average$447 | FlexibilityNo cancel fee | On-time63% |