San Antonio

$92+ 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 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Jul 8 — Jul 151
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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 July 3, 2025.

Round-trip from

$181
(Priceline)

One-way from

$92
(Mytrip)

Popular in

March

Cheapest in

September

Average price

$387

Good round-trip deal

$337 or less

Good one-way deal

$188 or less
From Illinois to San Antonio
One-way flight from Illinois to San Antonio
Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from Illinois to San Antonio.
Price to beat on a one-way flight from Illinois to San Antonio.

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 July 3, 2025.

This Priceline deal was found by Cheapflights users on 6/30. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/157:00 amORD - SAT
1 stop11h 02mMultiple Airlines
Tue 7/227:52 pmSAT - ORD
1 stop10h 11mMultiple Airlines
Deal found 6/30$181
This FlightHub deal was found by Cheapflights users on 7/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/223:18 pmORD - SAT
1 stop27h 18mSpirit Airlines
Thu 8/75:38 pmSAT - ORD
1 stop27h 52mSpirit Airlines
Deal found 7/1$188
This Frontier deal was found by Cheapflights users on 7/2. 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 8/85:01 amORD - SAT
1 stop11h 51mFrontier
Mon 8/115:38 pmSAT - ORD
1 stop6h 44mFrontier
Deal found 7/2$194
This Southwest deal was found by Cheapflights users on 7/2. 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 10/13:45 pmSTL - SAT
Nonstop2h 10mSouthwest
Mon 10/65:00 amSAT - STL
Nonstop2h 05mSouthwest
Deal found 7/2$197
This Mytrip deal was found by Cheapflights users on 7/2. 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 9/184:00 pmSTL - SAT
1 stop24h 30mFrontier
Sun 9/218:20 pmSAT - STL
1 stop12h 46mFrontier
Deal found 7/2$213
This Priceline deal was found by Cheapflights users on 7/1. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:15 amMDW - SAT
1 stop10h 25mFrontier
Sun 10/193:28 pmSAT - MDW
1 stop7h 10mFrontier
Deal found 7/1$216
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:15 amSTL - SAT
1 stop4h 22mUnited Airlines
Sat 9/135:30 amSAT - STL
2 stops6h 55mUnited Airlines
Deal found 7/1$224
This American Airlines deal was found by Cheapflights users on 7/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/295:32 pmSTL - SAT
1 stop6h 06mAmerican Airlines
Mon 9/15:00 amSAT - STL
1 stop3h 58mAmerican Airlines
Deal found 7/1$228
This Delta deal was found by Cheapflights users on 7/2. 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 7/316:00 amSTL - SAT
1 stop5h 19mDelta
Thu 8/710:45 amSAT - STL
1 stop5h 33mDelta
Deal found 7/2$233
This American Airlines deal was found by Cheapflights users on 7/3. 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 9/39:24 amORD - SAT
Nonstop2h 59mAmerican Airlines
Thu 9/41:00 pmSAT - ORD
Nonstop2h 59mAmerican Airlines
Deal found 7/3$235
This Southwest deal was found by Cheapflights users on 7/2. 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 10/252:00 pmMDW - SAT
Nonstop2h 45mSouthwest
Tue 10/285:55 amSAT - MDW
Nonstop2h 35mSouthwest
Deal found 7/2$235
This Mytrip deal was found by Cheapflights users on 7/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/225:26 pmSTL - SAT
2 stops25h 56mSpirit Airlines
Tue 7/297:10 amSAT - STL
1 stop9h 21mSpirit Airlines
Deal found 7/1$254

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 July 3, 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

Tue 7/15

7:00 am-6:02 pm

1 stop11h 02m

San Antonio

Tue 7/22

7:52 pm-6:03 am

1 stop10h 11m

$181

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Tue 7/22

3:18 pm-6:36 pm

1 stop27h 18m

San Antonio

Thu 8/7

5:38 pm-9:30 pm

1 stop27h 52m

$188

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Thu 7/31

6:16 pm-4:52 pm

1 stop22h 36m

San Antonio

Sun 8/3

8:14 pm-12:32 am

1 stop28h 18m

$197

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 10/1

3:45 pm-5:55 pm

Nonstop2h 10m

San Antonio

Mon 10/6

5:00 am-7:05 am

Nonstop2h 05m

$197

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 9/18

4:00 pm-4:30 pm

1 stop24h 30m

San Antonio

Sun 9/21

8:20 pm-9:06 am

1 stop12h 46m

$213

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 9/10

6:15 am-10:37 am

1 stop4h 22m

San Antonio

Sat 9/13

5:30 am-12:25 pm

2 stops6h 55m

$224

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 8/29

5:32 pm-11:38 pm

1 stop6h 06m

San Antonio

Mon 9/1

5:00 am-8:58 am

1 stop3h 58m

$228

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 7/31

6:00 am-11:19 am

1 stop5h 19m

San Antonio

Thu 8/7

10:45 am-4:18 pm

1 stop5h 33m

$233

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Wed 9/3

2:55 pm-5:49 pm

Nonstop2h 54m

San Antonio

Thu 9/4

1:00 pm-3:59 pm

Nonstop2h 59m

$235

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Sat 8/2

9:45 pm-12:25 am

Nonstop2h 40m

San Antonio

Mon 8/4

6:30 pm-9:10 pm

Nonstop2h 40m

$235

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 49 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, August is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $295). Flying from Illinois to San Antonio in March is currently the most expensive (average of $376). 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 July 3, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to San Antonio as you normally would.

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 July 3, 2025.

The most flights from USIL to SAT are scheduled on a Thursday (29 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing San Antonio

Get insights into the airlines that provide service to San Antonio. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Antonio. Reviews last updated July 3, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Illinois to San Antonio by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
8.0
Very good

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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.

  • 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 $92. Users have also found prices from $94 and $99 on United Airlines and Southwest, respectively.

  • What are the most popular routes 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 (81%), Air Canada (77%), United Airlines( 74%).

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

    While on average a flight from Illinois to San Antonio is generally $438, 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 $153 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, August is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $295). Flying from Illinois to San Antonio in March is currently the most expensive (average of $376). 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 Illinois?

Book flights to Illinois if you plan to visit one of these locations
New Braunfels

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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.

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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$125Average$217FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$132Average$257FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$199Average$406FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$232Average$499FlexibilityNo cancel feeOn-time63%
DeltaCheapest$258Average$348FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$258Average$441FlexibilityNo cancel feeOn-time69%

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