$127+ Cheap flights from San Antonio (SAT) to Illinois
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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Oct 10 — Oct 171
Round-trip
1 adult, Economy
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Find cheap flights from San Antonio to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 September 10, 2026.
Explore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.
This CheapOair deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2810:05 am -
1 stop6h 29m
Wed 9/3012:17 pm -
1 stop23h 27m
Deal found 9/6![Frontier logo]()
$233
This Trip.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/223:19 pm -
1 stop20h 13m
Wed 9/238:10 pm -
1 stop23h 15m
Deal found 9/5![Frontier logo]()
$243
This Expedia deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/29:50 pm -
1 stop13h 42m
Mon 10/58:10 pm -
1 stop23h 15m
Deal found 9/8![Frontier logo]()
$254
This CheapOair deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/233:19 pm -
1 stop19h 58m
Thu 9/246:39 pm -
1 stop14h 31m
Deal found 9/7![Frontier logo]()
$259
This Trip.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:47 pm -
1 stop20h 30m
Mon 9/2812:17 pm -
1 stop26h 03m
Deal found 9/7![Frontier logo]()
$262
This CheapOair deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/58:20 pm -
1 stop22h 54m
Mon 11/97:59 pm -
1 stop23h 26m
Deal found 9/5![Frontier logo]()
$268
This CheapOair deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:10 pm -
1 stop16h 06m
Tue 11/36:30 am -
1 stop12h 55m
Deal found 9/8![Frontier logo]()
$268
This Trip.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:50 pm -
1 stop7h 48m
Mon 9/288:55 pm -
1 stop17h 25m
Deal found 9/7![Frontier logo]()
$269
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/18:20 pm -
1 stop22h 57m
Sun 10/412:27 pm -
1 stop23h 17m
Deal found 9/10![Frontier logo]()
$270
This Super.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:21 pm -
1 stop28h 03m
Thu 10/156:58 pm -
1 stop14h 10m
Deal found 9/7![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:20 pm -
1 stop22h 57m
Tue 9/2212:17 pm -
1 stop26h 03m
Deal found 9/7![Frontier logo]()
$271
This CheapOair deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:34 pm -
1 stop14h 01m
Mon 10/198:00 pm -
1 stop23h 26m
Deal found 9/5![Frontier logo]()
$276
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 September 10, 2026.
Discover carefully curated flight deals from San Antonio to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.
This American Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/165:47 pm -
1 stop4h 15m
Wed 1/612:06 pm -
1 stop6h 03m
Deal found 9/7![American Airlines logo]()
$280
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2111:36 am -
2 stops10h 54m
Tue 10/275:04 pm -
1 stop7h 29m
Deal found 9/8![Delta logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/303:19 pm -
1 stop28h 54m
Sun 10/49:36 pm -
1 stop14h 08m
Deal found 9/9![Multiple Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/52:50 pm -
Nonstop2h 35m
Mon 11/99:30 pm -
Nonstop2h 50m
Deal found 9/10![Southwest logo]()
$365
This United Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/141:25 pm -
Nonstop2h 55m
Fri 1/157:45 pm -
Nonstop3h 14m
Deal found 9/8![United Airlines logo]()
$376
This American Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/239:33 am -
1 stop6h 58m
Sun 1/2412:38 pm -
1 stop7h 08m
Deal found 9/9![American Airlines logo]()
$316
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/225:20 am -
2 stops11h 02m
Sun 1/245:00 pm -
1 stop7h 28m
Deal found 9/9![Delta logo]()
$334
This Southwest deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:45 pm -
1 stop5h 25m
Wed 10/143:35 pm -
2 stops6h 40m
Deal found 9/8![Southwest logo]()
$372
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/65:15 am -
2 stops11h 09m
Tue 10/135:04 pm -
1 stop7h 29m
Deal found 9/8![Delta logo]()
$341
This American Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/305:00 am -
2 stops7h 49m
Fri 10/302:30 pm -
2 stops8h 27m
Deal found 9/10![American Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:32 pm -
1 stop5h 06m
Sun 10/116:32 am -
1 stop5h 39m
Deal found 9/7![United Airlines logo]()
$391
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/142:25 pm -
Nonstop2h 40m
Sat 10/1710:30 am -
2 stops6h 30m
Deal found 9/10![Southwest logo]()
$380
This Delta deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1411:36 am -
2 stops10h 54m
Fri 10/3011:08 am -
2 stops11h 59m
Deal found 9/6![Delta logo]()
$346
This American Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:48 pm -
1 stop5h 15m
Tue 9/294:24 pm -
1 stop6h 26m
Deal found 9/10![American Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/229:25 am -
2 stops22h 29m
Sun 10/258:53 pm -
1 stop15h 22m
Deal found 9/9![Multiple Airlines logo]()
$425
This United Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/91:35 pm -
1 stop7h 28m
Mon 1/112:31 pm -
2 stops8h 19m
Deal found 9/9![United Airlines logo]()
$401
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:25 am -
2 stops22h 34m
Sun 10/189:33 pm -
1 stop14h 42m
Deal found 9/8![Multiple Airlines logo]()
$427
This American Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:00 am -
1 stop7h 01m
Tue 1/56:43 pm -
1 stop5h 16m
Deal found 9/7![American Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1411:25 am -
2 stops5h 45m
Tue 10/2010:10 am -
2 stops5h 40m
Deal found 9/8![Southwest logo]()
$395
This United Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/301:35 pm -
1 stop7h 12m
Wed 2/35:41 pm -
1 stop5h 18m
Deal found 9/8![United Airlines logo]()
$409
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:00 pm -
1 stop5h 33m
Thu 11/56:04 am -
1 stop6h 31m
Deal found 9/8![Delta logo]()
$385
This Southwest deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:20 am -
Nonstop2h 40m
Sat 10/1710:30 am -
2 stops6h 30m
Deal found 9/7![Southwest logo]()
$412
This American Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/214:27 pm -
1 stop6h 48m
Sat 9/264:43 pm -
1 stop4h 23m
Deal found 9/7![American Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/75:58 pm -
1 stop6h 25m
Sun 10/119:05 am -
Nonstop3h 06m
Deal found 9/8![United Airlines logo]()
$429
This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/59:25 am -
2 stops23h 13m
Sun 11/88:37 pm -
1 stop24h 57m
Deal found 9/9![Multiple Airlines logo]()
$492
This Delta deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/135:15 am -
2 stops11h 07m
Mon 10/265:04 pm -
1 stop7h 29m
Deal found 9/6![Delta logo]()
$409
This Southwest deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/711:25 am -
1 stop3h 45m
Sat 10/101:50 pm -
Nonstop2h 10m
Deal found 9/6![Southwest logo]()
$417
This United Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2011:47 am -
2 stops11h 11m
Sat 10/318:15 am -
2 stops9h 48m
Deal found 9/6![United Airlines logo]()
$439
This American Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:38 pm -
1 stop5h 32m
Mon 10/265:30 pm -
1 stop6h 27m
Deal found 9/5![American Airlines logo]()
$416
This Southwest deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:00 pm -
Nonstop2h 05m
Wed 10/71:25 pm -
1 stop5h 00m
Deal found 9/5![Southwest logo]()
$421
Last-minute flights from San Antonio to IllinoisDiscover last-minute flight deals from San Antonio to Illinois. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Illinois. Data last updated September 10, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/153:19 pm -
1 stop14h 19m
Sat 10/36:30 am -
1 stop12h 55m
Deal found 9/8![Frontier logo]()
$279
This CheapOair deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:20 pm -
1 stop22h 57m
Tue 9/2212:17 pm -
1 stop26h 03m
Deal found 9/7![Frontier logo]()
$271
This Frontier deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/189:50 pm -
1 stop7h 48m
Tue 9/226:30 am -
1 stop12h 55m
Deal found 9/6![Frontier logo]()
$280
This Trip.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/223:19 pm -
1 stop20h 13m
Wed 9/238:10 pm -
1 stop23h 15m
Deal found 9/5![Frontier logo]()
$243
This CheapOair deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/233:19 pm -
1 stop19h 58m
Thu 9/246:39 pm -
1 stop14h 31m
Deal found 9/7![Frontier logo]()
$259
This Trip.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:47 pm -
1 stop20h 30m
Mon 9/2812:17 pm -
1 stop26h 03m
Deal found 9/7![Frontier logo]()
$262
This CheapOair deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2810:05 am -
1 stop6h 29m
Wed 9/3012:17 pm -
1 stop23h 27m
Deal found 9/6![Frontier logo]()
$233
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/18:20 pm -
1 stop22h 57m
Sun 10/412:27 pm -
1 stop23h 17m
Deal found 9/10![Frontier logo]()
$270
This Expedia deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/29:50 pm -
1 stop13h 42m
Mon 10/58:10 pm -
1 stop23h 15m
Deal found 9/8![Frontier logo]()
$254
This Trip.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/210:05 am -
1 stop6h 29m
Sun 10/412:27 pm -
1 stop23h 17m
Deal found 9/9![Frontier logo]()
$278
This CheapOair deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:34 pm -
1 stop14h 01m
Mon 10/198:00 pm -
1 stop23h 26m
Deal found 9/5![Frontier logo]()
$276
This CheapOair deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1610:03 am -
1 stop13h 10m
Sun 10/184:30 pm -
1 stop16h 38m
Deal found 9/5![Frontier logo]()
$280
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 September 10, 2026.
Search for one-way flight options from San Antonio to Illinois. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
This Super.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.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
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$127
This Frontier deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/712:00 pm -
1 stop6h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/512:00 pm -
1 stop7h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/210:05 am -
1 stop6h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$131
This Super.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:21 pm -
1 stop28h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/68:20 pm -
1 stop27h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$134
This Super.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:20 pm -
1 stop28h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/410:29 pm -
1 stop14h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$135
This Frontier deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:19 pm -
1 stop13h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$135
This Frontier deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2310:03 am -
1 stop12h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$136
This Frontier deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/610:13 am -
1 stop13h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$137
This Trip.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/78:20 pm -
1 stop28h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$138
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 September 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $233 (CheapOair) |
One-way from | $127 (Super.com) |
Popular in | June |
Cheapest in | February |
Average price | $367 |
Good round-trip deal | $344 or less |
Good one-way deal | $205 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 September 10, 2026.
Use the filters below to find and compare flights from San Antonio to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San AntonioChicago
SAT San Antonio - ORD Chicago O'Hare Intl
SATORD
San Antonio
Sat 10/10
8:21 pm-12:24 am
1 stop28h 03m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$133
San AntonioSt. Louis
SAT San Antonio - STL Lambert-St Louis
SATSTL
San Antonio
Sat 10/31
6:40 am-8:50 am
Nonstop2h 10m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$174
San AntonioSt. Louis
SAT San Antonio - STL Lambert-St Louis
SATSTL
San Antonio
Tue 12/8
7:25 am-9:35 am
Nonstop2h 10m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$179
San AntonioSt. Louis
SAT San Antonio - STL Lambert-St Louis
SATSTL
San Antonio
Wed 12/9
7:25 am-9:35 am
Nonstop2h 10m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$179
Quickest round-trip
San AntonioSt. Louis
SAT San Antonio - STL Lambert-St Louis
SATSTL
San Antonio
Sat 11/7
7:45 am-9:50 am
Nonstop2h 05m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$179
San AntonioChicago
SAT San Antonio - ORD Chicago O'Hare Intl
SATORD
San Antonio
Sat 12/12
5:09 pm-8:08 pm
Nonstop2h 59m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$183
San AntonioChicago
SAT San Antonio - ORD Chicago O'Hare Intl
SATORD
San Antonio
Mon 11/9
5:34 pm-8:40 pm
Nonstop3h 06m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$183
San AntonioChicago
SAT San Antonio - RFD Chicago Greater Rockford
SATRFD
San Antonio
Thu 10/1
9:25 am-7:12 pm
2 stops33h 47m
Chicago Greater Rockford
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$184
San AntonioChicago
SAT San Antonio - RFD Chicago Greater Rockford
SATRFD
San Antonio
Wed 11/11
10:29 pm-8:02 pm
1 stop21h 33m
Chicago Greater Rockford
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$185
San AntonioSt. Louis
SAT San Antonio - STL Lambert-St Louis
SATSTL
San Antonio
Tue 10/6
1:41 pm-9:23 pm
1 stop7h 42m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$189
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-CMI
SAT-MLI
SAT-RFD
SAT-MDW
SAT-ORD
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Antonio to Illinois
SAT-USIL
SAT-CMI
SAT-MLI
SAT-RFD
SAT-MDW
What is the cheapest month to book a flight from San Antonio to Illinois?
Currently, February is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $347). 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 September 10, 2026.
It’s optimal to fly from San Antonio to Illinois in the morning. By choosing this option you can save up to 26% 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 September 10, 2026.
The most flights from SAT to USIL 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 (12 on average).
How much does it cost to fly round-trip from San Antonio to Illinois?
Airfare is typical for this route at the moment.
San Antonio to Illinois flights typically cost between $268 and $465 in October.The cheapest round-trip price found within the last 5 days was $268 on Frontier (Oct 19-Nov 3).
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 September 10, 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.
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
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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Search flights from San Antonio to Illinois by cabin class
Find flights from San Antonio to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Antonio and Illinois flights
Browse other San Antonio and Illinois flight options. Last updated on September 10, 2026.
Popular flight searches
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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 September 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$131 | Average$267 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$237 | Average$444 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$281 | Average$464 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$287 | Average$441 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$306 | Average$328 | FlexibilityNo cancel fee | On-timeN/A |