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$80+ 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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
nov. 16 — nov. 231
dom. 11/16
dom. 11/23
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 octubre 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/14. 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.
jue. 11/1312:30 pmMDW - SAT
1 stop7h 13mFrontier
dom. 11/168:25 pmSAT - MDW
1 stop15h 05mFrontier
Deal found 10/14$156
This Kiwi.com deal was found by Cheapflights users on 10/16. 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.
mié. 11/56:05 pmORD - SAT
2 stops19h 14mFrontier
sáb. 11/83:12 pmSAT - ORD
1 stop8h 17mFrontier
Deal found 10/16$157
This Kiwi.com deal was found by Cheapflights users on 10/16. 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.
jue. 11/137:45 pmSTL - SAT
1 stop23h 45mFrontier
lun. 11/178:25 pmSAT - STL
1 stop12h 42mFrontier
Deal found 10/16$158
This Cheapflightsfares deal was found by Cheapflights users on 10/15. 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.
mié. 11/1210:52 amORD - SAT
1 stop7h 40mSpirit Airlines
mié. 11/1910:58 amSAT - ORD
1 stop12h 08mSpirit Airlines
Deal found 10/15$159
This Cheapflightsfares deal was found by Cheapflights users on 10/15. 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.
vie. 11/710:52 amORD - SAT
1 stop7h 40mSpirit Airlines
mar. 11/113:23 pmSAT - ORD
1 stop14h 09mSpirit Airlines
Deal found 10/15$160
This Kiwi.com deal was found by Cheapflights users on 10/15. 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.
mié. 11/510:52 amORD - SAT
1 stop7h 40mMultiple Airlines
lun. 11/108:25 pmSAT - ORD
1 stop19h 14mMultiple Airlines
Deal found 10/15$164
This Kiwi.com deal was found by Cheapflights users on 10/15. 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.
mié. 11/59:22 pmORD - SAT
2 stops35h 52mMultiple Airlines
sáb. 11/83:12 pmSAT - ORD
1 stop8h 17mMultiple Airlines
Deal found 10/15$165
This Kiwi.com deal was found by Cheapflights users on 10/16. 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.
vie. 10/316:00 amORD - SAT
1 stop13h 30mFrontier
sáb. 11/13:12 pmSAT - ORD
1 stop8h 17mFrontier
Deal found 10/16$169
This Kiwi.com deal was found by Cheapflights users on 10/15. 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.
mié. 11/1210:52 amORD - SAT
1 stop7h 40mMultiple Airlines
mié. 11/197:37 pmSAT - ORD
1 stop20h 48mMultiple Airlines
Deal found 10/15$171
This Expedia deal was found by Cheapflights users on 10/15. 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.
mar. 11/115:10 amORD - SAT
1 stop13h 22mSpirit Airlines
jue. 11/133:23 pmSAT - ORD
1 stop14h 09mSpirit Airlines
Deal found 10/15$174
This Kiwi.com deal was found by Cheapflights users on 10/15. 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.
mié. 11/510:52 amORD - SAT
1 stop7h 40mMultiple Airlines
vie. 11/78:25 pmSAT - ORD
1 stop27h 04mMultiple Airlines
Deal found 10/15$175
This Kiwi.com deal was found by Cheapflights users on 10/15. 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.
vie. 10/3112:30 pmMDW - SAT
1 stop25h 47mMultiple Airlines
lun. 11/37:37 pmSAT - MDW
2 stops16h 01mMultiple Airlines
Deal found 10/15$176

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 octubre 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$156
(Kiwi.com)

One-way from

$80
(Frontier)

Popular in

March

Cheapest in

October

Average price

$320

Good round-trip deal

$313 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 ($30 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.
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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 octubre 17, 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

MDW - SAT

MDWSAT

Chicago Midway

jue. 11/13

12:30 pm-7:43 pm

1 stop7h 13m

San Antonio

dom. 11/16

8:25 pm-11:30 am

1 stop15h 05m

$181

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

lun. 11/17

5:17 pm-12:38 am

1 stop7h 21m

San Antonio

jue. 11/20

8:00 am-1:00 pm

1 stop5h 00m

$219

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

jue. 12/25

9:36 am-7:01 pm

1 stop9h 25m

San Antonio

jue. 1/1

10:35 am-7:22 pm

1 stop8h 47m

$219

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

mar. 12/23

5:25 am-11:15 am

1 stop5h 50m

San Antonio

jue. 12/25

6:20 am-10:45 am

1 stop4h 25m

$219

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

mié. 12/24

1:50 pm-7:50 pm

1 stop6h 00m

San Antonio

jue. 12/25

11:55 am-5:20 pm

2 stops5h 25m

$224

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

jue. 10/30

6:22 pm-10:14 am

2 stops15h 52m

San Antonio

lun. 11/3

8:25 pm-9:07 am

1 stop12h 42m

$226

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

sáb. 11/1

8:40 pm-8:30 pm

1 stop23h 50m

San Antonio

jue. 11/6

8:25 pm-9:07 am

1 stop12h 42m

$234

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 10/31

8:40 pm-2:17 pm

1 stop17h 37m

San Antonio

dom. 11/2

8:26 pm-11:24 am

2 stops14h 58m

$250

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

mar. 11/11

5:20 pm-11:16 pm

1 stop5h 56m

San Antonio

dom. 11/16

7:05 am-11:50 am

1 stop4h 45m

$259

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

sáb. 11/8

10:20 am-4:10 pm

1 stop5h 50m

San Antonio

mar. 11/11

5:15 am-1:00 pm

1 stop7h 45m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

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 $78). Flying from Illinois to San Antonio in January is currently the most expensive (average of $186). 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 octubre 17, 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.

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 octubre 17, 2025.

The most flights from USIL to SAT are scheduled on a Wednesday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 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, Delta, and American Airlines can get you from Illinois to San Antonio in just under 7h 13m. Your travel time can differ by up to 2h 12m. 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 $85. Users have also found prices from $105 and $118 on United 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: 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 $419, our data shows the cheapest flight currently is $149. When looking at the most popular route, (Chicago O'Hare Intl - San Antonio), you can expect to pay $160 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 $78). Flying from Illinois to San Antonio in January is currently the most expensive (average of $186). 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 octubre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$125Average$227FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$288FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$203Average$506FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$228Average$405FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$230Average$397FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$368FlexibilityNo cancel feeOn-timeN/A

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