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$97+ 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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Apr 29 — May 61
Tue 4/29
Tue 5/6
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 April 24, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$201
(CheapOair)

One-way from

$97
(CheapOair)

Popular in

March

Cheapest in

August

Average price

$412

Good round-trip deal

$317 or less

Good one-way deal

$178 or less
Provider with most accurate pricing for Chicago (CHI)-San Antonio flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-San Antonio flights.
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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. 0% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 24, 2025.

This CheapOair deal was found by Cheapflights users on 4/23. 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 4/306:58 pmSTL - SAT
1 stop22h 37mFrontier
Sun 5/48:25 pmSAT - STL
1 stop12h 44mFrontier
Deal found 4/23$191
This Mytrip deal was found by Cheapflights users on 4/23. 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.
Sun 5/1110:00 amORD - SAT
1 stop26h 32mSpirit Airlines
Wed 5/141:27 pmSAT - ORD
2 stops34h 02mSpirit Airlines
Deal found 4/23$218
This CheapOair deal was found by Cheapflights users on 4/23. 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.
Thu 5/14:15 pmORD - SAT
1 stop27h 16mFrontier
Mon 5/53:22 pmSAT - ORD
1 stop8h 19mFrontier
Deal found 4/23$221
This CheapOair deal was found by Cheapflights users on 4/23. 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.
Thu 5/299:12 pmMDW - SAT
1 stop12h 35mFrontier
Sun 6/12:09 pmSAT - MDW
1 stop24h 47mFrontier
Deal found 4/23$221
This FlightHub deal was found by Cheapflights users on 4/22. 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.
Wed 5/286:59 pmORD - SAT
1 stop19h 01mMultiple Airlines
Mon 6/95:38 pmSAT - ORD
1 stop6h 21mMultiple Airlines
Deal found 4/22$224
This Delta deal was found by Cheapflights users on 4/22. 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 5/145:40 pmSTL - SAT
1 stop6h 41mDelta
Wed 5/218:00 amSAT - STL
1 stop6h 35mDelta
Deal found 4/22$229
This American Airlines deal was found by Cheapflights users on 4/23. 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.
Thu 5/293:37 pmPIA - SAT
1 stop7h 25mAmerican Airlines
Sun 6/16:15 amSAT - PIA
1 stop4h 30mAmerican Airlines
Deal found 4/23$229
This United Airlines deal was found by Cheapflights users on 4/23. 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 6/285:30 pmSTL - SAT
1 stop5h 23mUnited Airlines
Mon 6/305:30 amSAT - STL
2 stops6h 57mUnited Airlines
Deal found 4/23$244
This American Airlines deal was found by Cheapflights users on 4/24. 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.
Thu 5/2211:15 amMLI - SAT
1 stop6h 28mAmerican Airlines
Sun 6/86:00 amSAT - MLI
1 stop4h 54mAmerican Airlines
Deal found 4/24$259
This American Airlines deal was found by Cheapflights users on 4/23. 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.
Thu 9/184:49 pmSTL - SAT
1 stop5h 20mAmerican Airlines
Sun 9/216:28 pmSAT - STL
1 stop5h 21mAmerican Airlines
Deal found 4/23$284
This Southwest deal was found by Cheapflights users on 4/23. 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 5/156:10 pmSTL - SAT
Nonstop2h 15mSouthwest
Tue 5/202:25 pmSAT - STL
Nonstop2h 10mSouthwest
Deal found 4/23$305
This American Airlines deal was found by Cheapflights users on 4/23. 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 5/212:52 pmORD - SAT
Nonstop2h 51mAmerican Airlines
Sun 5/256:15 amSAT - ORD
Nonstop2h 55mAmerican Airlines
Deal found 4/23$307

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 April 24, 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

Sun 5/4

5:45 pm-7:31 pm

1 stop25h 46m

San Antonio

Sun 5/11

10:52 am-12:06 am

1 stop13h 14m

$201

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Sun 5/11

10:00 am-12:32 pm

1 stop26h 32m

San Antonio

Wed 5/14

1:27 pm-11:29 pm

2 stops34h 02m

$218

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Thu 6/5

5:08 pm-9:36 am

1 stop16h 28m

San Antonio

Sun 6/8

7:50 pm-11:59 pm

1 stop28h 09m

$221

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Thu 5/29

9:12 pm-9:47 am

1 stop12h 35m

San Antonio

Sun 6/1

2:09 pm-2:56 pm

1 stop24h 47m

$221

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Wed 5/28

6:59 pm-2:00 pm

1 stop19h 01m

San Antonio

Mon 6/9

5:38 pm-11:59 pm

1 stop6h 21m

$224

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 5/14

5:40 pm-12:21 am

1 stop6h 41m

San Antonio

Wed 5/21

8:00 am-2:35 pm

1 stop6h 35m

$229

PeoriaSan Antonio

PIA - SAT

PIASAT

Greater Peoria

Thu 5/29

3:37 pm-11:02 pm

1 stop7h 25m

San Antonio

Sun 6/1

6:15 am-10:45 am

1 stop4h 30m

$229

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 6/28

5:30 pm-10:53 pm

1 stop5h 23m

San Antonio

Mon 6/30

5:30 am-12:27 pm

2 stops6h 57m

$244

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Thu 5/22

11:15 am-5:43 pm

1 stop6h 28m

San Antonio

Sun 6/8

6:00 am-10:54 am

1 stop4h 54m

$259

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 5/15

6:10 pm-8:25 pm

Nonstop2h 15m

San Antonio

Tue 5/20

2:25 pm-4:35 pm

Nonstop2h 10m

$305

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

Showing 1-10 of 48 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 April 24, 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 April 24, 2025.

The most flights from USIL to SAT are scheduled on a Monday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 on average).

Rainfall in San Antonio by month

Plan your trip to San Antonio by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Antonio ranges from 1.6 - 3.7 inches per month. May is typically the wettest month, when rainfall can reach 3.7 in. December is typically the driest time to visit San Antonio when rainfall is around 1.6 in.

Temperature in San Antonio by month

Plan your trip to San Antonio by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Antonio, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 April 24, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Illinois to San Antonio. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,918 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,918 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,286 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,920 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,685 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 $97. Users have also found prices from $102 and $115 on Spirit Airlines and Delta, 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%), ANA (81%), Air Canada( 81%).

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

    While on average a flight from Illinois to San Antonio is generally $417, our data shows the cheapest flight currently is $108. When looking at the most popular route, (Chicago O'Hare Intl - San Antonio), you can expect to pay $195 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 April 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$101Average$251FlexibilityNo cancel feeOn-time65%
FrontierCheapest$125Average$210FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$221Average$505FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$234Average$419FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$258Average$452FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$375FlexibilityNo cancel feeOn-timeN/A

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