$94+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Sep 25 — Oct 21
Round-trip
1 adult, Economy
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Find cheap flights from San Antonio to Illinois with Cheapflights
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Cheapest flights from San Antonio to IllinoisExplore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 26, 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 August 26, 2026.
This American Airlines deal was found by Cheapflights users on 8/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:48 pm -
1 stop5h 39m
Sat 9/265:43 am -
1 stop4h 18m
Deal found 8/22![American Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 8/23. 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.
Fri 9/188:20 pm -
1 stop22h 57m
Mon 9/218:10 pm -
1 stop23h 15m
Deal found 8/23![Frontier logo]()
$220
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/158:20 pm -
1 stop22h 57m
Mon 9/218:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/158:20 pm -
1 stop22h 57m
Fri 9/188:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/158:20 pm -
1 stop22h 57m
Wed 9/238:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$231
This Kiwi.com deal was found by Cheapflights users on 8/23. 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.
Fri 10/168:21 pm -
1 stop22h 36m
Mon 10/198:00 pm -
1 stop23h 26m
Deal found 8/23![Frontier logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/188:20 pm -
1 stop22h 57m
Wed 9/238:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$251
This Super.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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.
Thu 9/178:20 pm -
1 stop28h 03m
Tue 9/226:30 am -
1 stop12h 55m
Deal found 8/25![Frontier logo]()
$256
This Kiwi.com deal was found by Cheapflights users on 8/23. 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.
Fri 9/118:20 pm -
1 stop22h 57m
Mon 9/148:10 pm -
1 stop23h 15m
Deal found 8/23![Frontier logo]()
$257
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Mon 9/146:30 am -
Nonstop3h 00m
Wed 9/168:45 am -
Nonstop3h 07m
Deal found 8/21![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 8/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:00 am -
Nonstop2h 40m
Wed 10/218:45 pm -
Nonstop2h 45m
Deal found 8/21![Southwest logo]()
$257
This Frontier deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 11/510:29 pm -
1 stop14h 04m
Mon 11/91:28 pm -
1 stop8h 06m
Deal found 8/26![Frontier logo]()
$258
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 August 26, 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 August 26, 2026.
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Mon 9/146:30 am -
Nonstop3h 00m
Wed 9/168:45 am -
Nonstop3h 07m
Deal found 8/21![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 8/22. 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.
Wed 10/142:25 pm -
Nonstop2h 40m
Mon 10/199:20 pm -
Nonstop2h 45m
Deal found 8/22![Southwest logo]()
$297
This Delta deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 10/2111:36 am -
2 stops10h 54m
Sat 10/2411:08 am -
2 stops11h 12m
Deal found 8/24![Delta logo]()
$313
This American Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 12/177:00 am -
1 stop7h 01m
Wed 1/62:39 pm -
1 stop5h 10m
Deal found 8/24![American Airlines logo]()
$355
This Kiwi.com deal was found by Cheapflights users on 8/21. 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.
Thu 10/19:25 am -
2 stops33h 47m
Sun 10/49:36 pm -
1 stop14h 08m
Deal found 8/21![Multiple Airlines logo]()
$441
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Fri 10/25:30 am -
1 stop4h 43m
Wed 10/77:50 pm -
Nonstop3h 00m
Deal found 8/21![United Airlines logo]()
$278
This Delta deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 10/225:15 am -
1 stop7h 44m
Mon 10/269:51 am -
1 stop7h 23m
Deal found 8/24![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 10/234:45 pm -
1 stop6h 25m
Mon 10/269:20 pm -
Nonstop2h 45m
Deal found 8/25![Southwest logo]()
$320
This United Airlines deal was found by Cheapflights users on 8/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/225:39 pm -
Nonstop3h 01m
Tue 1/57:15 am -
1 stop5h 50m
Deal found 8/22![United Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 10/2211:36 am -
1 stop6h 24m
Mon 10/265:09 pm -
1 stop7h 24m
Deal found 8/24![Delta logo]()
$317
This American Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 12/177:00 am -
1 stop7h 01m
Tue 1/56:43 pm -
1 stop5h 16m
Deal found 8/24![American Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 8/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:00 pm -
Nonstop2h 05m
Mon 10/199:45 pm -
Nonstop2h 10m
Deal found 8/21![Southwest logo]()
$327
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/224:21 pm -
1 stop6h 13m
Tue 9/294:32 pm -
1 stop7h 36m
Deal found 8/25![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 8/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1611:45 am -
1 stop5h 15m
Mon 10/199:45 pm -
Nonstop2h 10m
Deal found 8/23![Southwest logo]()
$337
This American Airlines deal was found by Cheapflights users on 8/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:00 am -
1 stop5h 50m
Thu 9/104:43 pm -
1 stop6h 07m
Deal found 8/22![American Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/185:30 pm -
Nonstop2h 59m
Mon 9/214:11 pm -
1 stop6h 33m
Deal found 8/25![United Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 8/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1012:45 pm -
Nonstop2h 40m
Tue 10/138:45 pm -
Nonstop2h 45m
Deal found 8/23![Southwest logo]()
$337
This American Airlines deal was found by Cheapflights users on 8/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/246:48 pm -
1 stop5h 15m
Thu 10/14:24 pm -
1 stop4h 42m
Deal found 8/22![American Airlines logo]()
$382
This Kiwi.com deal was found by Cheapflights users on 8/21. 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.
Thu 10/89:25 am -
2 stops22h 37m
Sun 10/119:33 pm -
1 stop14h 42m
Deal found 8/21![Multiple Airlines logo]()
$464
This United Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/175:30 am -
1 stop4h 40m
Sat 9/193:32 pm -
2 stops7h 12m
Deal found 8/25![United Airlines logo]()
$352
This Southwest deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 9/176:10 pm -
1 stop5h 40m
Mon 9/218:35 pm -
Nonstop2h 45m
Deal found 8/24![Southwest logo]()
$354
This United Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 12/176:45 am -
Nonstop2h 58m
Sun 12/207:45 pm -
Nonstop3h 14m
Deal found 8/25![United Airlines logo]()
$375
This Delta deal was found by Cheapflights users on 8/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:30 am -
1 stop10h 52m
Mon 10/265:04 pm -
1 stop7h 29m
Deal found 8/22![Delta logo]()
$417
This Southwest deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 10/15:00 pm -
Nonstop2h 05m
Thu 10/19:45 pm -
Nonstop2h 10m
Deal found 8/24![Southwest logo]()
$357
This Kiwi.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:39 pm -
1 stop8h 00m
Sun 9/209:29 pm -
1 stop14h 15m
Deal found 8/25![Multiple Airlines logo]()
$525
This United Airlines deal was found by Cheapflights users on 8/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/21:17 pm -
1 stop7h 26m
Mon 10/52:28 pm -
1 stop8h 22m
Deal found 8/23![United Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 8/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:15 am -
1 stop7h 32m
Tue 10/135:09 pm -
1 stop7h 24m
Deal found 8/21![Delta logo]()
$426
This American Airlines deal was found by Cheapflights users on 8/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/307:10 am -
1 stop4h 58m
Sun 11/112:11 pm -
1 stop5h 55m
Deal found 8/22![American Airlines logo]()
$485
This Southwest deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 10/312:45 pm -
Nonstop2h 40m
Sun 10/49:25 pm -
Nonstop2h 45m
Deal found 8/25![Southwest logo]()
$385
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Tue 9/85:30 pm -
Nonstop3h 00m
Mon 9/147:50 pm -
Nonstop3h 01m
Deal found 8/21![United Airlines logo]()
$386
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated August 26, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated August 26, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/23. 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.
Fri 9/118:20 pm -
1 stop22h 57m
Mon 9/148:10 pm -
1 stop23h 15m
Deal found 8/23![Frontier logo]()
$257
This American Airlines deal was found by Cheapflights users on 8/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/123:02 pm -
Nonstop3h 05m
Mon 9/149:06 pm -
Nonstop2h 49m
Deal found 8/21![American Airlines logo]()
$259
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Mon 9/146:30 am -
Nonstop3h 00m
Wed 9/168:45 am -
Nonstop3h 07m
Deal found 8/21![United Airlines logo]()
$257
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/158:20 pm -
1 stop22h 57m
Mon 9/218:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/158:20 pm -
1 stop22h 57m
Fri 9/188:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/158:20 pm -
1 stop22h 57m
Wed 9/238:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$231
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/158:20 pm -
1 stop22h 57m
Tue 9/2212:17 pm -
2 stops31h 08m
Deal found 8/26![Frontier logo]()
$260
This Super.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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.
Thu 9/178:20 pm -
1 stop28h 03m
Tue 9/226:30 am -
1 stop12h 55m
Deal found 8/25![Frontier logo]()
$256
This Kiwi.com deal was found by Cheapflights users on 8/23. 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.
Fri 9/188:20 pm -
1 stop22h 57m
Mon 9/218:10 pm -
1 stop23h 15m
Deal found 8/23![Frontier logo]()
$220
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” 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 9/188:20 pm -
1 stop22h 57m
Wed 9/238:10 pm -
1 stop23h 15m
Deal found 8/26![Frontier logo]()
$251
This American Airlines deal was found by Cheapflights users on 8/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:48 pm -
1 stop5h 39m
Sat 9/265:43 am -
1 stop4h 18m
Deal found 8/22![American Airlines logo]()
$187
This Trip.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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.
Fri 9/259:50 pm -
1 stop7h 48m
Mon 9/288:55 pm -
1 stop17h 25m
Deal found 8/24![Frontier logo]()
$260
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 August 26, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated August 26, 2026.
This American Airlines deal was found by Cheapflights users on 8/23. 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.
Tue 9/226:48 pm -
1 stop5h 39m
Deal found 8/23![American Airlines logo]()
$94
This Frontier deal was found by Cheapflights users on 8/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1910:03 am -
1 stop8h 59m
Deal found 8/21![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 9/228:20 pm -
1 stop22h 57m
Deal found 8/24![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 8/22. 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.
Tue 10/208:21 pm -
1 stop19h 03m
Deal found 8/22![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 8/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/208:21 pm -
1 stop28h 03m
Deal found 8/21![Frontier logo]()
$114
This Expedia deal was found by Cheapflights users on 8/22. 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.
Mon 9/218:20 pm -
1 stop28h 03m
Deal found 8/22![Frontier logo]()
$115
This Jetabroad deal was found by Cheapflights users on 8/21. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:21 pm -
1 stop28h 03m
Deal found 8/21![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 8/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2310:03 am -
1 stop8h 59m
Deal found 8/21![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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.
Fri 10/29:50 pm -
1 stop7h 48m
Deal found 8/25![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 9/258:20 pm -
1 stop22h 57m
Deal found 8/24![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 8/22. 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.
Fri 9/188:20 pm -
1 stop22h 57m
Deal found 8/22![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 8/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/18:20 pm -
1 stop28h 03m
Deal found 8/23![Frontier logo]()
$126
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 August 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $187 (American Airlines) |
One-way from | $89 (Delta) |
Popular in | June |
Cheapest in | September |
Average price | $382 |
Good round-trip deal | $350 or less |
Good one-way deal | $224 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 7,457,451 searches. Data last updated August 26, 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 AntonioChicago
SAT San Antonio - ORD Chicago O'Hare Intl
SATORD
San Antonio
Mon 9/14
6:30 am-9:30 am
Nonstop3h 00m
Chicago O'Hare Intl
Wed 9/16
8:45 am-11:52 am
Nonstop3h 07m
$257
San AntonioChicago
SAT San Antonio - ORD Chicago O'Hare Intl
SATORD
San Antonio
Fri 10/2
5:30 am-10:13 am
1 stop4h 43m
Chicago O'Hare Intl
Wed 10/7
7:50 pm-10:50 pm
Nonstop3h 00m
$278
San AntonioChicago
SAT San Antonio - MDW Chicago Midway
SATMDW
San Antonio
Wed 10/14
2:25 pm-5:05 pm
Nonstop2h 40m
Chicago Midway
Mon 10/19
9:20 pm-12:05 am
Nonstop2h 45m
$297
San AntonioChicago
SAT San Antonio - ORD Chicago O'Hare Intl
SATORD
San Antonio
Tue 12/22
5:39 pm-8:40 pm
Nonstop3h 01m
Chicago O'Hare Intl
Tue 1/5
7:15 am-1:05 pm
1 stop5h 50m
$307
San AntonioMoline
SAT San Antonio - MLI Moline Quad-City
SATMLI
San Antonio
Wed 10/21
11:36 am-10:30 pm
2 stops10h 54m
Moline Quad-City
Sat 10/24
11:08 am-10:20 pm
2 stops11h 12m
$313
San AntonioChicago
SAT San Antonio - ORD Chicago O'Hare Intl
SATORD
San Antonio
Thu 10/22
5:15 am-12:59 pm
1 stop7h 44m
Chicago O'Hare Intl
Mon 10/26
9:51 am-5:14 pm
1 stop7h 23m
$317
San AntonioChicago
SAT San Antonio - MDW Chicago Midway
SATMDW
San Antonio
Thu 10/22
11:36 am-6:00 pm
1 stop6h 24m
Chicago Midway
Mon 10/26
5:09 pm-12:33 am
1 stop7h 24m
$317
San AntonioBloomington
SAT San Antonio - BMI Bloomington-Normal
SATBMI
San Antonio
Tue 9/22
4:21 pm-10:34 pm
1 stop6h 13m
Bloomington-Normal
Tue 9/29
4:32 pm-12:08 am
1 stop7h 36m
$319
San AntonioChicago
SAT San Antonio - MDW Chicago Midway
SATMDW
San Antonio
Fri 10/23
4:45 pm-11:10 pm
1 stop6h 25m
Chicago Midway
Mon 10/26
9:20 pm-12:05 am
Nonstop2h 45m
$320
Quickest round-trip
San AntonioSt. Louis
SAT San Antonio - STL Lambert-St Louis
SATSTL
San Antonio
Thu 10/15
5:00 pm-7:05 pm
Nonstop2h 05m
Lambert-St Louis
Mon 10/19
9:45 pm-11:55 pm
Nonstop2h 10m
$327
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Antonio to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Antonio with our price prediction graph.
SAT-STL
SAT-ORD
SAT-MDW
SAT-RFD
SAT-PIA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Antonio to Illinois
SAT-USIL
SAT-STL
SAT-ORD
SAT-MDW
SAT-RFD
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, September is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $346). Flying from San Antonio to Illinois in June is currently the most expensive (average of $439). 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 August 26, 2026.
It’s optimal to fly from San Antonio to Illinois in the morning. By choosing this option you can save up to 27% on the cost of your flight, compared to a flight at noon.
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 August 26, 2026.
The most flights from SAT to USIL are scheduled on a Monday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 on average).
How much does it cost to fly round-trip from San Antonio to Illinois?
Airfare is below average for this route at the moment.
San Antonio to Illinois flights typically cost between $294 and $476 in September.The cheapest round-trip price found within the last 5 days was $256 on Frontier (Sep 17-Sep 22).
How far ahead should I book a flight from San Antonio to Illinois?
Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Antonio to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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 August 26, 2026.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest,Delta, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from San Antonio to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for San Antonio to Illinois
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Complete your trip
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San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on August 26, 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 7,457,451 searches. Data last updated August 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$235 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$237 | Average$441 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$281 | Average$461 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$287 | Average$443 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$323 | FlexibilityNo cancel fee | On-timeN/A |