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$67+ 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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This Frontier deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:05 amORD - SAT
1 stop10h 56mFrontier
Thu 1/810:13 amSAT - ORD
1 stop8h 32mFrontier
Deal found 12/16$253
This Frontier deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” 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 12/196:00 amORD - SAT
1 stop11h 01mFrontier
Thu 1/810:13 amSAT - ORD
1 stop8h 32mFrontier
Deal found 12/16$267
This CheapOair deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” 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 12/3111:23 amORD - SAT
1 stop6h 53mFrontier
Thu 1/16:45 amSAT - ORD
1 stop17h 27mFrontier
Deal found 12/16$269
This Frontier deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” 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 12/257:00 amORD - SAT
1 stop6h 14mFrontier
Mon 12/2912:18 pmSAT - ORD
1 stop11h 54mFrontier
Deal found 12/16$284
This Delta deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” 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 12/244:58 pmMLI - SAT
1 stop6h 09mDelta
Fri 1/211:16 amSAT - MLI
1 stop5h 00mDelta
Deal found 12/17$284
This Frontier deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:05 amORD - SAT
1 stop10h 56mFrontier
Fri 1/910:13 amSAT - ORD
1 stop12h 43mFrontier
Deal found 12/16$288
This CheapOair deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” 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 12/3111:23 amORD - SAT
1 stop6h 53mFrontier
Mon 1/57:11 pmSAT - ORD
1 stop21h 08mFrontier
Deal found 12/16$294
This Kiwi.com deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” 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 12/232:01 pmMDW - SAT
2 stops43h 22mFrontier
Thu 1/87:14 pmSAT - MDW
1 stop27h 55mFrontier
Deal found 12/16$297
This Trip.com deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:00 amORD - SAT
1 stop11h 01mFrontier
Thu 1/16:45 amSAT - ORD
1 stop17h 27mFrontier
Deal found 12/16$301
This Frontier deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” 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 12/196:00 amORD - SAT
1 stop11h 01mFrontier
Fri 1/910:13 amSAT - ORD
1 stop12h 43mFrontier
Deal found 12/16$302
This American Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:50 pmORD - SAT
Nonstop3h 01mAmerican Airlines
Thu 1/16:00 amSAT - ORD
Nonstop2h 51mAmerican Airlines
Deal found 12/17$306
This CheapOair deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” 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 12/267:00 amORD - SAT
1 stop17h 17mFrontier
Wed 12/316:45 amSAT - ORD
1 stop17h 27mFrontier
Deal found 12/17$309

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 December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$174
(Kiwi.com)

One-way from

$67
(Mytrip)

Popular in

December

Cheapest in

October

Average price

$421

Good round-trip deal

$350 or less

Good one-way deal

$138 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. 4% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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.
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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 December 18, 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

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Mon 1/19

6:20 am-5:23 pm

1 stop11h 03m

San Antonio

Tue 1/20

6:30 am-1:13 pm

1 stop6h 43m

$194

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 2/23

8:22 pm-4:17 pm

2 stops19h 55m

San Antonio

Sun 3/1

7:07 pm-1:09 pm

1 stop18h 02m

$199

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Sat 1/31

5:32 pm-9:30 am

1 stop15h 58m

San Antonio

Mon 2/2

8:24 pm-6:27 pm

2 stops22h 03m

$203

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 1/14

5:11 pm-8:14 am

1 stop15h 03m

San Antonio

Fri 1/16

6:30 am-10:34 pm

1 stop16h 04m

$204

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 1/14

3:43 pm-3:14 pm

1 stop23h 31m

San Antonio

Wed 1/21

6:30 am-11:33 pm

1 stop17h 03m

$211

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Sat 1/17

8:46 am-4:53 pm

1 stop8h 07m

San Antonio

Sat 1/31

1:20 pm-8:34 pm

1 stop7h 14m

$217

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Tue 1/27

10:47 am-9:21 pm

2 stops10h 34m

San Antonio

Sat 1/31

1:20 pm-8:34 pm

1 stop7h 14m

$222

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Sun 2/22

3:26 pm-8:31 am

1 stop17h 05m

San Antonio

Sat 2/28

7:56 pm-7:59 pm

2 stops24h 03m

$227

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Sun 1/18

3:58 pm-9:52 pm

1 stop5h 54m

San Antonio

Sun 2/1

6:06 am-10:58 am

1 stop4h 52m

$248

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Mon 1/5

6:12 am-5:01 pm

1 stop10h 49m

San Antonio

Thu 1/8

7:14 pm-11:09 pm

1 stop27h 55m

$254

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

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, January is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $73). Flying from Illinois to San Antonio in September is currently the most expensive (average of $154). 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 December 18, 2025.

It’s optimal to fly from Illinois to San Antonio in the evening. By choosing this option you can save up to 17% 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 afternoons 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.

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?

    Frontier, United Airlines, and American Airlines can get you from Illinois to San Antonio in just under 5h 54m. Your travel time can differ by up to 14h 01m. The distance between Illinois and San Antonio is about 936 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Illinois to San Antonio one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $50. Users have also found prices from $97 and $99 on Spirit Airlines and American Airlines, respectively.

  • 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: Air Canada (83%), ANA (83%), Alaska Airlines( 79%).

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

    While on average a flight from Illinois to San Antonio is generally $519, our data shows the cheapest flight currently is $101. When looking at the most popular route, (Chicago O'Hare Intl - San Antonio), you can expect to pay $156 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, January is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $73). Flying from Illinois to San Antonio in September is currently the most expensive (average of $154). 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 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$209FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$259FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$201Average$389FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$203Average$513FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$213Average$400FlexibilityNo cancel feeOn-time71%

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