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$62+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find flight deals from Illinois to San Antonio

Cheapest flights from Illinois to San Antonio
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 30, 2025.

This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/137:45 pmSTL - SAT
1 stop23h 45mFrontier
Mon 11/178:25 pmSAT - STL
1 stop12h 42mFrontier
Deal found 10/28$119
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:45 pmSTL - SAT
1 stop23h 58mFrontier
Sat 11/153:12 pmSAT - STL
1 stop17h 55mFrontier
Deal found 10/28$120
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:15 amMDW - SAT
1 stop10h 36mFrontier
Sun 12/75:46 pmSAT - MDW
1 stop16h 06mFrontier
Deal found 10/28$152
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/47:00 amORD - SAT
1 stop7h 11mMultiple Airlines
Thu 12/112:13 pmSAT - ORD
1 stop7h 06mMultiple Airlines
Deal found 10/27$153
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
Sat 12/62:26 pmORD - SAT
1 stop17h 29mMultiple Airlines
Sat 12/137:00 amSAT - ORD
1 stop17h 13mMultiple Airlines
Deal found 10/30$154
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 11/175:05 amORD - SAT
1 stop11h 35mMultiple Airlines
Wed 12/37:37 pmSAT - ORD
1 stop18h 20mMultiple Airlines
Deal found 10/30$155
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 11/175:05 amORD - SAT
1 stop11h 35mMultiple Airlines
Wed 11/196:45 amSAT - ORD
2 stops24h 58mMultiple Airlines
Deal found 10/30$156
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/137:43 pmSTL - SAT
1 stop13h 47mMultiple Airlines
Sat 1/106:00 amSAT - STL
1 stop16h 33mMultiple Airlines
Deal found 10/28$156
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/186:05 pmORD - SAT
1 stop24h 40mFrontier
Sun 11/237:39 pmSAT - ORD
1 stop21h 36mFrontier
Deal found 10/28$158
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 11/175:05 amORD - SAT
1 stop11h 35mMultiple Airlines
Tue 12/24:54 pmSAT - ORD
1 stop23h 09mMultiple Airlines
Deal found 10/30$159
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 11/158:00 amORD - SAT
1 stop9h 10mFrontier
Mon 11/178:25 pmSAT - ORD
2 stops14h 49mFrontier
Deal found 10/29$160
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:48 amORD - SAT
1 stop9h 11mMultiple Airlines
Fri 12/55:46 pmSAT - ORD
1 stop18h 08mMultiple Airlines
Deal found 10/27$161

Cheap 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 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$119
(Mytrip)

One-way from

$62
(Trip.com)

Popular in

March

Cheapest in

October

Average price

$317

Good round-trip deal

$347 or less

Good one-way deal

$158 or less
Provider with most accurate pricing for Chicago (CHI)-San Antonio flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-San Antonio flights.
Search Deals
From Illinois to San Antonio
Search Deals
One-way flight from Illinois to San Antonio
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($32 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Illinois to San Antonio.
Search Deals
Price to beat on a one-way flight from Illinois to San Antonio.
Search Deals

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 October 30, 2025.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.

Fly from

Illinois

Fly to

San Antonio

Route

Depart

Return

Price

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 11/14

5:05 pm-10:03 am

1 stop16h 58m

San Antonio

Tue 11/18

7:37 pm-11:01 pm

2 stops27h 24m

$229

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 12/11

6:15 pm-11:20 pm

1 stop5h 05m

San Antonio

Mon 12/15

6:50 am-11:25 am

1 stop4h 35m

$239

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 12/15

5:12 pm-11:17 pm

1 stop6h 05m

San Antonio

Wed 12/17

6:25 am-12:04 pm

1 stop5h 39m

$239

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Sat 3/7

5:37 pm-11:12 pm

1 stop5h 35m

San Antonio

Tue 3/10

7:00 am-1:57 pm

1 stop6h 57m

$259

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 12/23

8:35 pm-1:20 am

1 stop4h 45m

San Antonio

Tue 12/30

5:30 am-9:35 am

1 stop4h 05m

$259

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Wed 12/10

5:40 pm-10:59 pm

1 stop5h 19m

San Antonio

Mon 12/15

7:00 am-11:50 am

1 stop4h 50m

$259

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Thu 12/18

5:08 pm-12:34 am

1 stop7h 26m

San Antonio

Wed 12/24

4:45 pm-10:30 pm

1 stop5h 45m

$259

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Tue 1/20

5:06 pm-10:30 pm

1 stop5h 24m

San Antonio

Sat 1/24

11:17 am-4:26 pm

1 stop5h 09m

$259

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Wed 12/3

5:08 pm-12:34 am

1 stop7h 26m

San Antonio

Mon 12/8

4:52 pm-10:33 pm

1 stop5h 41m

$259

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Sun 1/18

5:06 pm-11:30 pm

1 stop6h 24m

San Antonio

Wed 1/28

4:29 pm-10:32 pm

1 stop6h 03m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 60 results
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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.
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

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 $77). Flying from Illinois to San Antonio in February is currently the most expensive (average of $179). 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 30, 2025.

It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 23% on the cost of your flight, compared to a flight at noon.

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 December 16, 2024.

Travelers seeking maximum savings on their Illinois to San Antonio flight should consider departing on Tuesday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Illinois to San Antonio?

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.

  • What airport do you fly into for flights to San Antonio from Illinois?

    Most people fly into San Antonio (SAT) if they book a flight to San Antonio from Illinois. San Antonio is conveniently located just 7.6 mi from San Antonio’s city center.

  • How long is the flight from Illinois to San Antonio?

    Southwest, Delta, and United Airlines can get you from Illinois to San Antonio in just under 5h 05m. Your travel time can differ by up to 1h. The distance between Illinois and San Antonio is about 786 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Illinois to San Antonio?

    Most travelers choose Chicago O'Hare Intl - San Antonio, Chicago Midway - San Antonio or Lambert-St Louis - San Antonio when deciding on the best route from Illinois to San Antonio.

  • What are the most reliable airlines from Illinois to San Antonio?

    Before booking your flight to San Antonio from Illinois, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (100%), Republic Airways (91%), Air Canada( 86%).

  • What are the cheapest flights from Illinois to San Antonio?

    While on average a flight from Illinois to San Antonio is generally $532, our data shows the cheapest flight currently is $148. When looking at the most popular route, (Chicago O'Hare Intl - San Antonio), you can expect to pay $149 for that flight.

  • Can I find deals for flights from Illinois to San Antonio that include hotel bookings?

    Yes. In addition to deals on Illinois to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to San Antonio?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to San Antonio.

  • Can I find deals for business class flights from Illinois to San Antonio?

    Yes. Cheapflights offers flight deals from Illinois to San Antonio by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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 $77). Flying from Illinois to San Antonio in February is currently the most expensive (average of $179). 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.

See more FAQs

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville

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Alternative routes for Illinois to San Antonio

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Illinois to San Antonio

Discover the top 6 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$125Average$229FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$288FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$203Average$507FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$229Average$395FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$229Average$404FlexibilityNo cancel feeOn-time71%
DeltaCheapest$258Average$368FlexibilityNo cancel feeOn-timeN/A

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