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$106+ 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 5/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Apr 5 — Apr 121
Sat 4/5
Sat 4/12
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 March 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$200
(CheapOair)

One-way from

$106
(CheapOair)

Popular in

March

Cheapest in

September

Average price

$449

Good round-trip deal

$362 or less

Good one-way deal

$167 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 ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 31, 2025.

This CheapOair deal was found by Cheapflights users on 3/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/236:58 pmSTL - SAT
1 stop21h 54mFrontier
Mon 4/287:59 pmSAT - STL
1 stop28h 05mFrontier
Deal found 3/30$200
This Frontier deal was found by Cheapflights users on 3/30. 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.
Tue 4/156:45 amORD - SAT
1 stop7h 09mFrontier
Sat 4/198:02 pmSAT - ORD
1 stop8h 59mFrontier
Deal found 3/30$218
This Frontier deal was found by Cheapflights users on 3/31. 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.
Sat 4/196:45 amMDW - SAT
1 stop6h 32mFrontier
Sun 4/204:34 pmSAT - MDW
1 stop12h 46mFrontier
Deal found 3/31$218
This Cheapflightsfares deal was found by Cheapflights users on 3/31. 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.
Fri 5/99:02 pmORD - SAT
1 stop8h 02mSpirit Airlines
Mon 5/1210:51 pmSAT - ORD
1 stop12h 04mSpirit Airlines
Deal found 3/31$219
This United Airlines deal was found by Cheapflights users on 3/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/146:00 amSTL - SAT
1 stop5h 16mUnited Airlines
Wed 5/212:25 pmSAT - STL
1 stop6h 07mUnited Airlines
Deal found 3/30$229
This CheapOair deal was found by Cheapflights users on 3/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/244:30 pmORD - SAT
1 stop26h 29mMultiple Airlines
Sat 4/267:00 amSAT - ORD
1 stop16h 05mMultiple Airlines
Deal found 3/30$239
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/276:00 amSTL - SAT
1 stop5h 45mDelta
Wed 4/3012:13 pmSAT - STL
1 stop5h 49mDelta
Deal found 3/30$239
This American Airlines deal was found by Cheapflights users on 3/29. 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.
Fri 5/167:19 pmSTL - SAT
1 stop4h 39mAmerican Airlines
Sun 5/186:34 pmSAT - STL
1 stop5h 17mAmerican Airlines
Deal found 3/29$249
This American Airlines deal was found by Cheapflights users on 3/29. 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.
Sat 10/411:24 amMLI - SAT
1 stop5h 16mAmerican Airlines
Mon 10/66:17 amSAT - MLI
1 stop4h 22mAmerican Airlines
Deal found 3/29$259
This American Airlines deal was found by Cheapflights users on 3/31. 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 5/73:37 pmPIA - SAT
1 stop5h 12mAmerican Airlines
Sun 5/113:15 pmSAT - PIA
1 stop6h 41mAmerican Airlines
Deal found 3/31$259
This United Airlines deal was found by Cheapflights users on 3/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/266:30 amMLI - SAT
2 stops9h 03mUnited Airlines
Sat 5/312:09 pmSAT - MLI
2 stops9h 25mUnited Airlines
Deal found 3/30$269
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/135:15 pmMLI - SAT
1 stop5h 03mDelta
Tue 5/204:15 pmSAT - MLI
1 stop6h 42mDelta
Deal found 3/30$279

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 March 31, 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

Wed 4/23

6:58 pm-4:52 pm

1 stop21h 54m

San Antonio

Mon 4/28

7:59 pm-12:04 am

1 stop28h 05m

$200

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Tue 4/15

6:45 am-1:54 pm

1 stop7h 09m

San Antonio

Thu 4/17

9:13 am-4:18 pm

1 stop7h 05m

$218

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Sat 4/19

6:45 am-1:17 pm

1 stop6h 32m

San Antonio

Sun 4/20

4:34 pm-5:20 am

1 stop12h 46m

$218

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Fri 5/9

9:02 pm-5:04 am

1 stop8h 02m

San Antonio

Mon 5/12

10:51 pm-10:55 am

1 stop12h 04m

$219

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 5/14

6:00 am-11:16 am

1 stop5h 16m

San Antonio

Wed 5/21

2:25 pm-8:32 pm

1 stop6h 07m

$229

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Thu 4/24

4:30 pm-6:59 pm

1 stop26h 29m

San Antonio

Sat 4/26

7:00 am-11:05 pm

1 stop16h 05m

$239

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sun 4/27

6:00 am-11:45 am

1 stop5h 45m

San Antonio

Wed 4/30

12:13 pm-6:02 pm

1 stop5h 49m

$239

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 5/16

7:19 pm-11:58 pm

1 stop4h 39m

San Antonio

Sun 5/18

6:34 pm-11:51 pm

1 stop5h 17m

$249

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Fri 4/25

3:24 pm-7:45 pm

1 stop4h 21m

San Antonio

Sun 4/27

6:02 am-10:51 am

1 stop4h 49m

$259

PeoriaSan Antonio

PIA - SAT

PIASAT

Greater Peoria

Wed 5/7

3:37 pm-8:49 pm

1 stop5h 12m

San Antonio

Sun 5/11

3:15 pm-9:56 pm

1 stop6h 41m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 53 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 March 31, 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 March 31, 2025.

The most flights from USIL to SAT are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 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 March 31, 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
9,818 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,276 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,614 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $106. Users have also found prices from $115 and $117 on American Airlines and Spirit 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: Alaska Airlines (88%), Emirates (88%), American Airlines( 86%).

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

    While on average a flight from Illinois to San Antonio is generally $319, 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 $188 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 March 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$113Average$259FlexibilityNo cancel feeOn-time65%
FrontierCheapest$125Average$210FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$221Average$428FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$230Average$422FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$258Average$453FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$368FlexibilityNo cancel feeOn-timeN/A
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