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$65+ 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 27 — Feb 31
Tue 1/27
Tue 2/3
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 28, 2025.

This Expedia deal was found by Cheapflights users on 12/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:01 pmORD - SAT
1 stop23h 15mFrontier
Mon 1/56:45 amSAT - ORD
1 stop17h 27mFrontier
Deal found 12/26$363
This Delta deal was found by Cheapflights users on 12/25. 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 12/264:58 pmMLI - SAT
1 stop7h 40mDelta
Tue 1/1311:12 amSAT - MLI
1 stop5h 14mDelta
Deal found 12/25$364
This United Airlines deal was found by Cheapflights users on 12/25. 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 12/276:30 amMLI - SAT
1 stop5h 44mUnited Airlines
Sat 1/1011:43 amSAT - MLI
2 stops9h 53mUnited Airlines
Deal found 12/25$369
This Delta deal was found by Cheapflights users on 12/25. 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 12/264:58 pmMLI - SAT
1 stop7h 40mDelta
Thu 1/84:29 pmSAT - MLI
1 stop6h 04mDelta
Deal found 12/25$399
This Delta deal was found by Cheapflights users on 12/25. 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 12/264:58 pmMLI - SAT
1 stop7h 40mDelta
Fri 1/24:45 pmSAT - MLI
1 stop5h 45mDelta
Deal found 12/25$409
This American Airlines deal was found by Cheapflights users on 12/26. 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.
Sat 12/276:20 amMLI - SAT
1 stop5h 48mAmerican Airlines
Sat 1/36:44 amSAT - MLI
2 stops7h 21mAmerican Airlines
Deal found 12/26$414
This American Airlines deal was found by Cheapflights users on 12/25. 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 12/273:21 pmMLI - SAT
1 stop5h 20mAmerican Airlines
Sat 1/1012:41 pmSAT - MLI
2 stops9h 42mAmerican Airlines
Deal found 12/25$415
This Delta deal was found by Cheapflights users on 12/25. 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 12/264:58 pmMLI - SAT
1 stop7h 40mDelta
Wed 12/314:45 pmSAT - MLI
1 stop5h 45mDelta
Deal found 12/25$419
This Delta deal was found by Cheapflights users on 12/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:02 pmSTL - SAT
1 stop5h 36mDelta
Mon 1/54:29 pmSAT - STL
1 stop7h 10mDelta
Deal found 12/26$421
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Sat 12/2710:30 amSTL - SAT
1 stop7h 16mUnited Airlines
Fri 1/25:15 amSAT - STL
2 stops7h 12mUnited Airlines
Deal found 12/26$426
This United Airlines deal was found by Cheapflights users on 12/25. 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 12/276:30 amMLI - SAT
1 stop5h 44mUnited Airlines
Thu 1/81:20 pmSAT - MLI
1 stop7h 14mUnited Airlines
Deal found 12/25$434
This American Airlines deal was found by Cheapflights users on 12/26. 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.
Sat 12/274:20 pmPIA - SAT
1 stop5h 30mAmerican Airlines
Sat 1/33:00 pmSAT - PIA
2 stops8h 31mAmerican Airlines
Deal found 12/26$438

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 28, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$173
(Kiwi.com)

One-way from

$65
(Super.com)

Popular in

March

Cheapest in

October

Average price

$415

Good round-trip deal

$350 or less

Good one-way deal

$130 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. 6% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($3 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 28, 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

Thu 1/29

10:01 pm-12:25 pm

1 stop14h 24m

San Antonio

Sun 2/1

8:24 pm-12:50 pm

1 stop16h 26m

$186

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 2/7

12:12 pm-11:52 pm

1 stop11h 40m

San Antonio

Wed 2/18

6:00 am-10:27 pm

1 stop16h 27m

$188

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 1/17

3:43 pm-4:17 pm

2 stops24h 34m

San Antonio

Tue 1/27

6:30 am-11:33 pm

1 stop17h 03m

$191

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Sat 1/17

7:50 pm-10:50 pm

Nonstop3h 00m

San Antonio

Sun 1/18

2:10 pm-4:45 pm

Nonstop2h 35m

$238

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 1/29

10:01 pm-12:25 pm

1 stop14h 24m

San Antonio

Sun 2/1

10:35 am-6:51 am

2 stops20h 16m

$240

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 3/6

7:52 am-8:08 pm

1 stop12h 16m

San Antonio

Tue 3/10

2:13 pm-11:19 pm

1 stop9h 06m

$250

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 4/22

6:00 am-11:16 am

1 stop5h 16m

San Antonio

Wed 4/29

6:30 am-2:38 pm

1 stop8h 08m

$259

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 1/27

9:59 am-5:22 pm

1 stop7h 23m

San Antonio

Wed 1/28

1:40 pm-8:37 pm

1 stop6h 57m

$259

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 1/23

6:00 am-10:47 am

1 stop4h 47m

San Antonio

Sat 1/24

1:20 pm-8:58 pm

1 stop7h 38m

$264

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 1/17

1:15 pm-9:21 pm

2 stops8h 06m

San Antonio

Tue 1/27

5:25 am-12:29 pm

2 stops7h 04m

$269

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

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 $74). 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 28, 2025.

It’s optimal to fly from Illinois to San Antonio in the afternoon. By choosing this option you can save up to 7% 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 27, 2025.

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. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 28, 2025.

The most flights from USIL to SAT are scheduled on a Saturday (23 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (8 on average).

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, Southwest, and Spirit Airlines can get you from Illinois to San Antonio in just under 3h. Your travel time can differ by up to 24h 09m. The distance between Illinois and San Antonio is about 1036 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 $56 and $76 on Spirit Airlines and Southwest, 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 $442, 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 $132 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 $74). 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 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$211FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$259FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$203Average$367FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$203Average$504FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$212Average$398FlexibilityNo cancel feeOn-time71%

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