$126+ Cheap flights from Illinois to San Antonio (SAT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Oct 31 — Nov 71
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 October 1, 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 October 1, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/77:25 am -
1 stop12h 37m
Fri 12/1110:52 pm -
1 stop30h 09m
Deal found 9/30![Frontier logo]()
$267
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/246:40 am -
1 stop12h 53m
Wed 12/26:44 pm -
1 stop6h 09m
Deal found 9/30![Frontier logo]()
$268
This Super.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/276:30 am -
1 stop12h 55m
Tue 11/38:20 pm -
1 stop28h 01m
Deal found 9/29![Frontier logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:30 am -
1 stop12h 55m
Sat 10/318:20 pm -
2 stops38h 15m
Deal found 9/30![Frontier logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:30 am -
1 stop12h 55m
Wed 11/48:20 pm -
2 stops22h 48m
Deal found 9/30![Frontier logo]()
$272
This CheapOair deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am -
1 stop12h 56m
Wed 10/288:20 pm -
1 stop28h 01m
Deal found 9/27![Frontier logo]()
$275
This Kiwi.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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.
Sat 10/248:30 am -
2 stops10h 56m
Wed 10/288:20 pm -
1 stop28h 01m
Deal found 9/29![Frontier logo]()
$276
This CheapOair deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:30 am -
1 stop12h 55m
Thu 11/198:20 pm -
1 stop28h 33m
Deal found 9/27![Frontier logo]()
$278
This Cheapflightsfares deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/176:30 am -
1 stop12h 55m
Sat 11/218:28 pm -
1 stop28h 25m
Deal found 9/30![Frontier logo]()
$279
This Cheapflightsfares deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:30 am -
1 stop12h 56m
Wed 10/2110:03 am -
1 stop21h 28m
Deal found 9/29![Frontier logo]()
$280
This American Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 11/116:05 am -
1 stop7h 27m
Sat 11/146:40 pm -
1 stop5h 30m
Deal found 9/27![American Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 11/1711:05 am -
1 stop6h 20m
Wed 11/254:32 pm -
1 stop6h 36m
Deal found 9/27![Delta logo]()
$323
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 October 1, 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 October 1, 2026.
This American Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 11/116:05 am -
2 stops9h 32m
Sat 11/147:00 am -
2 stops7h 37m
Deal found 9/27![American Airlines logo]()
$300
This Delta deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 9/27![Delta logo]()
$323
This United Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 10/242:28 pm -
2 stops8h 23m
Sat 11/79:35 am -
2 stops8h 17m
Deal found 9/27![United Airlines logo]()
$346
This Southwest deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/246:20 pm -
Nonstop2h 50m
Mon 10/267:55 pm -
1 stop5h 15m
Deal found 9/30![Southwest logo]()
$347
This American Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 12/43:12 pm -
2 stops8h 55m
Tue 12/86:00 am -
2 stops8h 50m
Deal found 9/27![American Airlines logo]()
$300
This Delta deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” 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 1/611:00 am -
2 stops12h 20m
Wed 1/205:20 am -
2 stops11h 02m
Deal found 10/1![Delta logo]()
$333
This United Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/149:00 am -
Nonstop3h 08m
Tue 11/174:48 pm -
1 stop5h 58m
Deal found 9/28![United Airlines logo]()
$347
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 10/288:45 pm -
Nonstop2h 50m
Wed 11/46:45 am -
1 stop4h 10m
Deal found 9/28![Southwest logo]()
$347
This American Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 1/54:58 pm -
2 stops7h 00m
Tue 1/198:00 am -
2 stops9h 14m
Deal found 9/29![American Airlines logo]()
$333
This Delta deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/265:04 pm -
1 stop7h 29m
Sat 11/711:00 am -
1 stop5h 29m
Deal found 9/30![Delta logo]()
$336
This United Airlines deal was found by Cheapflights users on 9/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/297:45 pm -
Nonstop3h 14m
Fri 1/15:39 pm -
Nonstop3h 01m
Deal found 9/26![United Airlines logo]()
$350
This Southwest deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/246:35 am -
2 stops9h 30m
Wed 10/284:35 pm -
1 stop4h 30m
Deal found 9/29![Southwest logo]()
$362
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 12/174:29 pm -
1 stop5h 50m
Thu 12/244:50 pm -
1 stop5h 34m
Deal found 9/29![Delta logo]()
$349
This American Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 11/113:58 pm -
1 stop6h 01m
Sat 11/145:47 pm -
1 stop5h 30m
Deal found 9/27![American Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 9/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:10 am -
2 stops5h 40m
Thu 10/294:40 pm -
1 stop4h 45m
Deal found 9/26![Southwest logo]()
$362
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 2/254:00 pm -
1 stop6h 27m
Sun 2/288:00 am -
1 stop7h 16m
Deal found 9/29![Delta logo]()
$349
This American Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 11/112:32 pm -
1 stop4h 50m
Sat 11/147:15 am -
1 stop7h 36m
Deal found 9/27![American Airlines logo]()
$353
This United Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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.
Sun 11/16:55 am -
1 stop6h 21m
Wed 11/41:15 pm -
Nonstop2h 58m
Deal found 9/30![United Airlines logo]()
$425
This Delta deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” 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 1/711:00 am -
2 stops12h 20m
Thu 1/214:25 pm -
1 stop6h 05m
Deal found 10/1![Delta logo]()
$354
This American Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 12/171:46 pm -
2 stops9h 10m
Thu 12/249:23 am -
1 stop5h 55m
Deal found 9/28![American Airlines logo]()
$354
This Southwest deal was found by Cheapflights users on 9/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/299:30 pm -
Nonstop2h 55m
Fri 1/17:25 am -
1 stop4h 40m
Deal found 9/26![Southwest logo]()
$407
This United Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/68:27 pm -
Nonstop3h 08m
Sun 11/86:34 am -
Nonstop2h 59m
Deal found 9/29![United Airlines logo]()
$428
This American Airlines deal was found by Cheapflights users on 9/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/122:34 pm -
2 stops9h 30m
Sat 11/147:15 am -
1 stop6h 43m
Deal found 9/26![American Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/306:00 am -
2 stops11h 34m
Sun 11/15:15 am -
2 stops11h 14m
Deal found 9/30![Delta logo]()
$377
This Southwest deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/69:30 pm -
Nonstop2h 55m
Sun 11/89:15 am -
Nonstop2h 40m
Deal found 9/29![Southwest logo]()
$428
This United Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/273:45 pm -
1 stop7h 14m
Sat 1/3010:00 am -
2 stops8h 00m
Deal found 9/30![United Airlines logo]()
$428
This American Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/203:01 pm -
2 stops9h 05m
Mon 11/237:09 am -
1 stop7h 22m
Deal found 9/30![American Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 12/1712:45 pm -
2 stops7h 20m
Sat 12/197:15 pm -
1 stop3h 50m
Deal found 9/30![Southwest logo]()
$428
This United Airlines deal was found by Cheapflights users on 9/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/287:45 pm -
Nonstop3h 14m
Fri 1/19:26 am -
1 stop5h 28m
Deal found 9/26![United Airlines logo]()
$432
This Delta deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/1712:30 pm -
1 stop5h 10m
Sat 11/215:10 pm -
1 stop5h 44m
Deal found 9/30![Delta logo]()
$397
Last-minute flights from Illinois to San AntonioDiscover last-minute flight deals from Illinois to San Antonio. Data last updated October 1, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Antonio. Data last updated October 1, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am -
1 stop12h 56m
Wed 10/288:20 pm -
1 stop28h 01m
Deal found 9/27![Frontier logo]()
$275
This Kiwi.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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.
Sat 10/248:30 am -
2 stops10h 56m
Wed 10/288:20 pm -
1 stop28h 01m
Deal found 9/29![Frontier logo]()
$276
This American Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 10/245:03 pm -
1 stop6h 55m
Sat 11/76:00 am -
1 stop4h 59m
Deal found 9/27![American Airlines logo]()
$336
This Super.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/276:30 am -
1 stop12h 55m
Tue 11/38:20 pm -
1 stop28h 01m
Deal found 9/29![Frontier logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:30 am -
1 stop12h 55m
Sat 10/318:20 pm -
2 stops38h 15m
Deal found 9/30![Frontier logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:30 am -
1 stop12h 55m
Wed 11/48:20 pm -
2 stops22h 48m
Deal found 9/30![Frontier logo]()
$272
This Cheapflightsfares deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:30 am -
1 stop12h 55m
Fri 11/610:13 am -
1 stop22h 33m
Deal found 9/29![Frontier logo]()
$267
This Trip.com deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:30 am -
1 stop12h 55m
Mon 11/168:20 pm -
1 stop28h 01m
Deal found 10/1![Frontier logo]()
$280
This CheapOair deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:30 am -
1 stop12h 55m
Thu 11/198:20 pm -
1 stop28h 33m
Deal found 10/1![Frontier logo]()
$277
This Cheapflightsfares deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/176:30 am -
1 stop12h 55m
Sat 11/218:28 pm -
1 stop28h 25m
Deal found 9/30![Frontier logo]()
$279
This Delta deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 11/1711:05 am -
1 stop6h 20m
Wed 11/254:32 pm -
1 stop6h 36m
Deal found 9/27![Delta logo]()
$323
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/246:40 am -
1 stop12h 53m
Wed 12/26:44 pm -
1 stop6h 09m
Deal found 9/30![Frontier logo]()
$268
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 October 1, 2026.
Search for one-way flight options from Illinois to San Antonio. Find affordable one-way fares based on user searches. Data last updated October 1, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/2712:27 pm -
2 stops30h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$126
This Cheapflightsfares deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/265:19 am -
1 stop9h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$127
This Super.com deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 10/316:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$132
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$133
This CheapOair deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” 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 11/36:30 am -
1 stop12h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2812:27 pm -
2 stops30h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$143
This Frontier deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 11/246:40 am -
1 stop12h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$145
This Cheapflightsfares deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:30 am -
1 stop12h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/2912:20 pm -
2 stops55h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$147
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/306:30 am -
1 stop12h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/224:20 pm -
2 stops19h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:16 am -
2 stops37h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Frontier logo]()
$155
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 October 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $267 (Cheapflightsfares) |
One-way from | $126 (Kiwi.com) |
Popular in | August |
Cheapest in | September |
Average price | $388 |
Good round-trip deal | $378 or less |
Good one-way deal | $252 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Antonio that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 1, 2026.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Thu 11/12
8:30 pm-11:37 pm
Nonstop3h 07m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$169
Quickest round-trip
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Thu 10/29
9:20 pm-12:10 am
Nonstop2h 50m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$169
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Wed 11/25
9:30 pm-12:30 am
Nonstop3h 00m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$169
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Tue 12/1
5:05 pm-10:57 pm
1 stop5h 52m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$179
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Fri 11/27
9:00 am-12:08 pm
Nonstop3h 08m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$182
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Fri 10/30
9:00 am-12:24 pm
Nonstop3h 24m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$182
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Tue 10/27
10:10 am-3:50 pm
2 stops5h 40m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$184
ChicagoSan Antonio
ORD Chicago O'Hare Intl - SAT San Antonio
ORDSAT
Chicago O'Hare Intl
Fri 11/27
6:23 am-11:55 am
1 stop5h 32m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$192
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Fri 10/30
5:09 pm-12:33 am
1 stop7h 24m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$192
ChicagoSan Antonio
MDW Chicago Midway - SAT San Antonio
MDWSAT
Chicago Midway
Thu 11/26
10:10 am-1:00 pm
Nonstop2h 50m
San Antonio
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$209
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to San Antonio
Have a flexible travel schedule? Discover the best time to fly to San Antonio from Illinois with our price prediction graph.
ORD-SAT
MLI-SAT
SPI-SAT
MDW-SAT
BMI-SAT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Illinois to San Antonio
USIL-SAT
ORD-SAT
MLI-SAT
SPI-SAT
MDW-SAT
What is the cheapest month to book a flight from Illinois to San Antonio?
Currently, January is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $361). Flying from Illinois to San Antonio in March is currently the most expensive (average of $435). 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 October 1, 2026.
It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 3% on the cost of your flight, compared to a flight at noon.
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 October 1, 2026.
The most flights from USIL to SAT are scheduled on a Wednesday (23 on average). You will have fewer flight options on Monday, 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 $365 and $532 in December.The cheapest round-trip price found within the last 5 days was $267 on Frontier (Dec 7-Dec 11).
How far ahead should I book a flight from Illinois to San Antonio?
Booking 46 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to San Antonio. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Illinois to San Antonio?
Use this chart to determine the cheapest time to fly round-trip from Illinois to San Antonio. Price data was last updated on September 26, 2026.
Travelers seeking maximum savings on their Illinois to San Antonio flight should consider departing on Friday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Antonio. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to San Antonio
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Complete your trip
Complete your trip to San Antonio by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to San Antonio by cabin class
Find flights from Illinois to San Antonio, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and San Antonio flights
Browse other Illinois and San Antonio flight options. Last updated on October 1, 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 October 1, 2026.
Illinois to San Antonio flights
Consider these flights traveling from Illinois to San Antonio.
Top 5 airlines flying from Illinois to San Antonio
Discover the top 5 airlines that operate flights from Illinois to San Antonio. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$234 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$224 | Average$368 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$246 | Average$329 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$258 | Average$402 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$277 | Average$443 | FlexibilityNo cancel fee | On-time63% |