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San Antonio

$93+ 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 8/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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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 June 30, 2025.

Round-trip from

$181
(Priceline)

One-way from

$93
(FlightHub)

Popular in

March

Cheapest in

September

Average price

$427

Good round-trip deal

$337 or less

Good one-way deal

$188 or less
From Illinois to San Antonio
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One-way flight from Illinois to San Antonio
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Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Illinois to San Antonio.
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Price to beat on a one-way flight from Illinois to San Antonio.
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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 June 30, 2025.

This Priceline deal was found by Cheapflights users on 6/29. 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 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 6/29$181
This FlightHub deal was found by Cheapflights users on 6/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/297:08 amORD - SAT
1 stop11h 28mSpirit Airlines
Sun 8/105:38 pmSAT - ORD
1 stop27h 52mSpirit Airlines
Deal found 6/28$182
This FlightHub deal was found by Cheapflights users on 6/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/45:04 pmMDW - SAT
1 stop23h 26mFrontier
Mon 9/85:35 pmSAT - MDW
1 stop5h 45mFrontier
Deal found 6/29$191
This Southwest deal was found by Cheapflights users on 6/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/79:50 amSTL - SAT
Nonstop2h 05mSouthwest
Mon 8/115:00 amSAT - STL
Nonstop2h 10mSouthwest
Deal found 6/28$197
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/285:01 amORD - SAT
1 stop11h 51mFrontier
Mon 8/45:38 pmSAT - ORD
1 stop6h 44mFrontier
Deal found 6/30$205
This Delta deal was found by Cheapflights users on 6/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/73:41 pmSTL - SAT
1 stop6h 36mDelta
Mon 8/1112:05 pmSAT - STL
1 stop5h 49mDelta
Deal found 6/29$207
This United Airlines deal was found by Cheapflights users on 6/28. 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 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 9/136:30 amSAT - STL
1 stop7h 49mUnited Airlines
Deal found 6/28$218
This American Airlines deal was found by Cheapflights users on 6/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:23 amSTL - SAT
1 stop5h 12mAmerican Airlines
Sat 8/95:00 amSAT - STL
1 stop4h 00mAmerican Airlines
Deal found 6/29$223
This American Airlines deal was found by Cheapflights users on 6/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/32:55 pmORD - SAT
Nonstop2h 54mAmerican Airlines
Mon 9/87:00 amSAT - ORD
Nonstop2h 53mAmerican Airlines
Deal found 6/28$235
This Southwest deal was found by Cheapflights users on 6/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/29:45 pmMDW - SAT
Nonstop2h 40mSouthwest
Mon 8/46:30 pmSAT - MDW
Nonstop2h 40mSouthwest
Deal found 6/28$235
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/157:29 pmSTL - SAT
1 stop22h 33mMultiple Airlines
Sun 8/1712:39 pmSAT - STL
1 stop24h 53mMultiple Airlines
Deal found 6/30$240
This Flightnetwork deal was found by Cheapflights users on 6/28. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/72:36 pmSTL - SAT
1 stop26h 16mFrontier
Mon 8/115:38 pmSAT - STL
2 stops30h 09mFrontier
Deal found 6/28$246

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 June 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

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 7/29

7:08 am-6:36 pm

1 stop11h 28m

San Antonio

Sun 8/10

5:38 pm-9:30 pm

1 stop27h 52m

$182

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Thu 9/4

5:04 pm-4:30 pm

1 stop23h 26m

San Antonio

Mon 9/8

5:35 pm-11:20 pm

1 stop5h 45m

$191

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 8/7

9:50 am-11:55 am

Nonstop2h 05m

San Antonio

Mon 8/11

5:00 am-7:10 am

Nonstop2h 10m

$197

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Mon 7/28

5:01 am-4:52 pm

1 stop11h 51m

San Antonio

Mon 8/4

5:38 pm-12:22 am

1 stop6h 44m

$205

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 8/7

3:41 pm-10:17 pm

1 stop6h 36m

San Antonio

Mon 8/11

12:05 pm-5:54 pm

1 stop5h 49m

$207

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

6:30 am-2:19 pm

1 stop7h 49m

$218

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 8/5

7:23 am-12:35 pm

1 stop5h 12m

San Antonio

Sat 8/9

5:00 am-9:00 am

1 stop4h 00m

$223

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Wed 9/3

2:55 pm-5:49 pm

Nonstop2h 54m

San Antonio

Mon 9/8

7:00 am-9:53 am

Nonstop2h 53m

$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 6/28

Showing 1-10 of 51 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 June 30, 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 June 30, 2025.

The most flights from USIL to SAT are scheduled on a Monday (30 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 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 June 30, 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.
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Food

7.0

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.
Southwest
8.0
Very good
4,278 reviews
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Food

7.0

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.
Delta
8.0
Very good
7,969 reviews
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Food

7.0

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.
United Airlines
7.4
Good
8,852 reviews
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Food

7.0

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.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Food

7.0

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.
Spirit Airlines
6.3
Okay
8,096 reviews
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Food

7.0

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 $93. Users have also found prices from $98 and $99 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: United Airlines (83%), Air Canada (79%), SkyWest Airlines( 76%).

  • 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 $146 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.
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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 June 30, 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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