$89+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Sep 11 — Sep 181
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 12, 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 12, 2026.
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:34 pm -
1 stop13h 05m
Mon 10/1912:43 pm -
1 stop12h 34m
Deal found 8/11![Frontier logo]()
$164
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:39 pm -
1 stop14h 31m
Mon 10/1212:43 pm -
1 stop12h 34m
Deal found 8/11![Frontier logo]()
$174
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:10 pm -
1 stop23h 15m
Mon 9/2110:05 am -
1 stop6h 29m
Deal found 8/11![Frontier logo]()
$210
This CheapOair deal was found by Cheapflights users on 8/10. 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.
Tue 9/1512:17 pm -
1 stop26h 03m
Thu 9/178:20 pm -
1 stop22h 57m
Deal found 8/10![Frontier logo]()
$220
This CheapOair deal was found by Cheapflights users on 8/7. 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.
Sat 9/2612:17 pm -
1 stop23h 27m
Wed 9/303:19 pm -
1 stop19h 58m
Deal found 8/7![Frontier logo]()
$240
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:45 pm -
1 stop26h 44m
Fri 9/410:24 pm -
1 stop19h 26m
Deal found 8/11![Frontier logo]()
$246
This Expedia deal was found by Cheapflights users on 8/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/148:10 pm -
1 stop23h 15m
Fri 9/189:50 pm -
1 stop13h 42m
Deal found 8/6![Frontier logo]()
$248
This CheapOair deal was found by Cheapflights users on 8/6. 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.
Fri 11/65:32 pm -
1 stop25h 21m
Mon 11/912:43 pm -
1 stop9h 56m
Deal found 8/6![Frontier logo]()
$258
This Southwest deal was found by Cheapflights users on 8/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/239:45 pm -
Nonstop2h 10m
Tue 10/277:20 am -
Nonstop2h 05m
Deal found 8/9![Southwest logo]()
$262
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Thu 9/106:43 pm -
1 stop4h 07m
Tue 9/155:00 am -
1 stop4h 24m
Deal found 8/10![American Airlines logo]()
$263
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Thu 9/245:18 pm -
1 stop6h 37m
Thu 10/15:00 am -
1 stop4h 24m
Deal found 8/10![American Airlines logo]()
$265
This CheapOair deal was found by Cheapflights users on 8/10. 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.
Fri 9/118:55 pm -
1 stop16h 53m
Sun 9/1312:39 pm -
1 stop16h 59m
Deal found 8/10![Frontier logo]()
$298
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 12, 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 12, 2026.
This Southwest deal was found by Cheapflights users on 8/10. 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 10/74:30 pm -
1 stop6h 45m
Mon 10/125:45 pm -
1 stop5h 25m
Deal found 8/10![Southwest logo]()
$290
This Delta deal was found by Cheapflights users on 8/9. 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.
Tue 1/55:55 am -
1 stop7h 27m
Tue 1/1910:45 am -
1 stop5h 37m
Deal found 8/9![Delta logo]()
$303
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Wed 9/98:13 am -
2 stops7h 30m
Wed 9/165:30 am -
2 stops7h 01m
Deal found 8/7![United Airlines logo]()
$313
This American Airlines deal was found by Cheapflights users on 8/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:00 am -
1 stop6h 53m
Thu 9/105:00 am -
1 stop7h 01m
Deal found 8/8![American Airlines logo]()
$329
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:29 am -
1 stop13h 08m
Mon 8/179:32 pm -
1 stop8h 05m
Deal found 8/11![Frontier logo]()
$352
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/18:08 pm -
1 stop12h 54m
Wed 11/411:08 am -
2 stops29h 12m
Deal found 8/10![Multiple Airlines logo]()
$444
This Delta deal was found by Cheapflights users on 8/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/25:13 pm -
1 stop7h 18m
Sat 12/55:00 pm -
1 stop5h 58m
Deal found 8/10![Delta logo]()
$303
This Southwest deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/258:35 pm -
Nonstop2h 45m
Fri 10/22:35 pm -
Nonstop2h 40m
Deal found 8/11![Southwest logo]()
$307
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:15 am -
1 stop5h 56m
Mon 10/55:30 pm -
1 stop5h 28m
Deal found 8/11![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 8/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/310:35 am -
1 stop6h 39m
Fri 11/66:45 am -
1 stop7h 43m
Deal found 8/10![Delta logo]()
$308
This Southwest deal was found by Cheapflights users on 8/10. 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.
Tue 9/228:30 pm -
Nonstop2h 45m
Sat 9/2611:10 am -
Nonstop2h 35m
Deal found 8/10![Southwest logo]()
$308
This United Airlines deal was found by Cheapflights users on 8/8. 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 9/58:45 am -
Nonstop3h 07m
Thu 9/106:30 am -
Nonstop3h 00m
Deal found 8/8![United Airlines logo]()
$337
This American Airlines deal was found by Cheapflights users on 8/10. 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 11/132:32 pm -
2 stops9h 32m
Mon 11/167:10 am -
1 stop6h 47m
Deal found 8/10![American Airlines logo]()
$380
This Southwest deal was found by Cheapflights users on 8/7. 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.
Sat 10/171:50 pm -
Nonstop2h 10m
Tue 10/207:20 am -
Nonstop2h 05m
Deal found 8/7![Southwest logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Thu 10/225:30 am -
1 stop5h 13m
Sat 10/242:00 pm -
Nonstop3h 00m
Deal found 8/7![United Airlines logo]()
$348
This Delta deal was found by Cheapflights users on 8/8. 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.
Fri 10/309:29 am -
1 stop6h 44m
Mon 11/26:00 am -
1 stop5h 47m
Deal found 8/8![Delta logo]()
$357
This Southwest deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2110:10 am -
2 stops5h 40m
Mon 10/266:45 pm -
1 stop5h 30m
Deal found 8/11![Southwest logo]()
$332
This American Airlines deal was found by Cheapflights users on 8/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am -
2 stops8h 53m
Mon 8/312:45 pm -
2 stops9h 14m
Deal found 8/8![American Airlines logo]()
$419
This Southwest deal was found by Cheapflights users on 8/8. 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 10/239:45 pm -
Nonstop2h 10m
Tue 10/2711:25 am -
1 stop3h 45m
Deal found 8/8![Southwest logo]()
$333
This Delta deal was found by Cheapflights users on 8/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/134:22 pm -
1 stop8h 09m
Mon 11/165:30 am -
1 stop5h 56m
Deal found 8/10![Delta logo]()
$379
This United Airlines deal was found by Cheapflights users on 8/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2212:47 pm -
1 stop4h 56m
Thu 9/242:00 pm -
Nonstop3h 00m
Deal found 8/10![United Airlines logo]()
$387
This American Airlines deal was found by Cheapflights users on 8/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/43:50 pm -
1 stop7h 02m
Wed 12/910:33 am -
1 stop4h 47m
Deal found 8/8![American Airlines logo]()
$447
This Southwest deal was found by Cheapflights users on 8/8. 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.
Mon 10/129:45 pm -
Nonstop2h 10m
Fri 10/166:45 pm -
1 stop5h 00m
Deal found 8/8![Southwest logo]()
$337
This American Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:15 am -
1 stop5h 46m
Tue 11/37:27 am -
1 stop5h 55m
Deal found 8/11![American Airlines logo]()
$447
This Southwest deal was found by Cheapflights users on 8/10. 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.
Sat 9/510:15 am -
2 stops7h 55m
Sat 9/122:30 pm -
1 stop4h 45m
Deal found 8/10![Southwest logo]()
$338
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Tue 9/13:35 pm -
1 stop7h 15m
Sun 9/612:55 pm -
1 stop6h 08m
Deal found 8/7![United Airlines logo]()
$409
This United Airlines deal was found by Cheapflights users on 8/8. 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.
Fri 9/410:41 am -
1 stop5h 50m
Tue 9/85:30 am -
2 stops8h 09m
Deal found 8/8![United Airlines logo]()
$412
This American Airlines deal was found by Cheapflights users on 8/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:53 pm -
1 stop7h 02m
Sun 9/275:41 pm -
1 stop5h 48m
Deal found 8/8![American Airlines logo]()
$457
This Southwest deal was found by Cheapflights users on 8/7. 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.
Wed 10/710:10 am -
2 stops5h 40m
Wed 10/1412:55 pm -
2 stops6h 30m
Deal found 8/7![Southwest logo]()
$353
This United Airlines deal was found by Cheapflights users on 8/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/310:41 am -
2 stops9h 17m
Sun 9/612:55 pm -
1 stop6h 08m
Deal found 8/10![United Airlines logo]()
$414
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated August 12, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated August 12, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:45 pm -
1 stop26h 44m
Fri 9/410:24 pm -
1 stop19h 26m
Deal found 8/11![Frontier logo]()
$246
This CheapOair deal was found by Cheapflights users on 8/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:45 pm -
1 stop19h 35m
Mon 9/1412:39 pm -
1 stop22h 53m
Deal found 8/9![Frontier logo]()
$268
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:39 pm -
1 stop14h 31m
Sun 9/1312:39 pm -
1 stop22h 38m
Deal found 8/11![Frontier logo]()
$258
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Thu 9/106:43 pm -
1 stop4h 07m
Tue 9/155:00 am -
1 stop4h 24m
Deal found 8/10![American Airlines logo]()
$263
This Southwest deal was found by Cheapflights users on 8/10. 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 9/108:30 am -
Nonstop2h 05m
Tue 9/153:30 pm -
Nonstop2h 10m
Deal found 8/10![Southwest logo]()
$282
This Expedia deal was found by Cheapflights users on 8/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/148:10 pm -
1 stop23h 15m
Fri 9/189:50 pm -
1 stop13h 42m
Deal found 8/6![Frontier logo]()
$248
This CheapOair deal was found by Cheapflights users on 8/10. 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.
Tue 9/1512:17 pm -
1 stop26h 03m
Thu 9/178:20 pm -
1 stop22h 57m
Deal found 8/10![Frontier logo]()
$220
This Kiwi.com deal was found by Cheapflights users on 8/8. 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.
Wed 9/168:10 pm -
1 stop23h 15m
Tue 9/228:20 pm -
1 stop22h 57m
Deal found 8/8![Frontier logo]()
$266
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:10 pm -
1 stop23h 15m
Mon 9/2110:05 am -
1 stop6h 29m
Deal found 8/11![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 8/8. 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.
Mon 9/218:10 pm -
1 stop23h 15m
Tue 9/298:20 pm -
1 stop22h 57m
Deal found 8/8![Frontier logo]()
$283
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Thu 9/245:18 pm -
1 stop6h 37m
Thu 10/15:00 am -
1 stop4h 24m
Deal found 8/10![American Airlines logo]()
$265
This CheapOair deal was found by Cheapflights users on 8/7. 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.
Sat 9/2612:17 pm -
1 stop23h 27m
Wed 9/303:19 pm -
1 stop19h 58m
Deal found 8/7![Frontier logo]()
$240
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 12, 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 12, 2026.
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:39 pm -
1 stop14h 31m
Deal found 8/11![Frontier logo]()
$89
This CheapOair deal was found by Cheapflights users on 8/10. 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.
Sat 10/108:10 pm -
1 stop18h 05m
Deal found 8/10![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 8/10. 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.
Thu 10/88:34 pm -
1 stop13h 05m
Deal found 8/10![Frontier logo]()
$114
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:17 pm -
1 stop8h 46m
Deal found 8/11![Frontier logo]()
$118
This Trip.com deal was found by Cheapflights users on 8/7. 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.
Tue 10/612:17 pm -
1 stop26h 03m
Deal found 8/7![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1011:06 am -
1 stop23h 06m
Deal found 8/11![Frontier logo]()
$127
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/175:30 am -
1 stop5h 29m
Deal found 8/11![United Airlines logo]()
$129
This Southwest deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/104:45 pm -
1 stop5h 45m
Deal found 8/11![Southwest logo]()
$129
This Southwest deal was found by Cheapflights users on 8/10. 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 9/98:40 am -
Nonstop2h 10m
Deal found 8/10![Southwest logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:10 pm -
1 stop15h 11m
Deal found 8/10![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/88:10 pm -
1 stop14h 02m
Deal found 8/10![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:05 am -
2 stops36h 20m
Deal found 8/11![Frontier logo]()
$132
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 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $164 (Frontier) |
One-way from | $89 (CheapOair) |
Popular in | April |
Cheapest in | October |
Average price | $426 |
Good round-trip deal | $368 or less |
Good one-way deal | $148 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 12, 2026.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisSan Antonio
STL Lambert-St Louis - SAT San Antonio
STLSAT
Lambert-St Louis
Wed 10/7
4:30 pm-11:15 pm
1 stop6h 45m
San Antonio
Mon 10/12
5:45 pm-11:10 pm
1 stop5h 25m
$290
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
MolineSan Antonio
MLI Moline Quad-City - SAT San Antonio
MLISAT
Moline Quad-City
Wed 12/2
5:13 pm-12:31 am
1 stop7h 18m
San Antonio
Sat 12/5
5:00 pm-10:58 pm
1 stop5h 58m
$303
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Fri 9/25
8:35 pm-11:20 pm
Nonstop2h 45m
San Antonio
Fri 10/2
2:35 pm-5:15 pm
Nonstop2h 40m
$307
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Tue 11/3
10:35 am-5:14 pm
1 stop6h 39m
San Antonio
Fri 11/6
6:45 am-2:28 pm
1 stop7h 43m
$308
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Tue 9/22
8:30 pm-11:15 pm
Nonstop2h 45m
San Antonio
Sat 9/26
11:10 am-1:45 pm
Nonstop2h 35m
$308
MolineSan Antonio
MLI Moline Quad-City - SAT San Antonio
MLISAT
Moline Quad-City
Wed 9/9
8:13 am-3:43 pm
2 stops7h 30m
San Antonio
Wed 9/16
5:30 am-12:31 pm
2 stops7h 01m
$313
Quickest round-trip
St. LouisSan Antonio
STL Lambert-St Louis - SAT San Antonio
STLSAT
Lambert-St Louis
Sat 10/17
1:50 pm-4:00 pm
Nonstop2h 10m
San Antonio
Tue 10/20
7:20 am-9:25 am
Nonstop2h 05m
$319
PeoriaSan Antonio
PIA Greater Peoria - SAT San Antonio
PIASAT
Greater Peoria
Sun 9/6
6:00 am-12:53 pm
1 stop6h 53m
San Antonio
Thu 9/10
5:00 am-12:01 pm
1 stop7h 01m
$329
PeoriaSan Antonio
PIA Greater Peoria - SAT San Antonio
PIASAT
Greater Peoria
Fri 10/2
6:15 am-12:11 pm
1 stop5h 56m
San Antonio
Mon 10/5
5:30 pm-10:58 pm
1 stop5h 28m
$329
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
MLI-SAT
PIA-SAT
ORD-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
MLI-SAT
PIA-SAT
ORD-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 $351). Flying from Illinois to San Antonio in March is currently the most expensive (average of $441). 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 12, 2026.
It’s optimal to fly from Illinois to San Antonio in the afternoon. By choosing this option you can save up to 4% 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 12, 2026.
The most flights from USIL to SAT are scheduled on a Tuesday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 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 $335 and $591 in September.The cheapest round-trip price found within the last 5 days was $298 on Frontier (Sep 11-Sep 13).
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 8, 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
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Alternative routes for Illinois to San Antonio
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Complete your trip
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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 12, 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 12, 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 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$226 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$217 | Average$371 | 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% |