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Cheap flights from Illinois to San Antonio from $63

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to San Antonio departing on 1/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:50 am - 7:03 pmSTL-SAT
10h 13m1 stop
Frontier Logo
11:17 am - 6:32 pmSAT-STL
7h 15m1 stop
$156Frontier
Find Deal
Mon, Jan 12 - Fri, Jan 16
Frontier Logo
6:00 am - 5:01 pmORD-SAT
11h 01m1 stop
Frontier Logo
10:18 am - 8:23 pmSAT-ORD
10h 05m1 stop
$161Frontier
Find Deal
Mon, Dec 22 - Thu, Dec 25
Multiple Airlines Logo
12:07 pm - 7:33 pmORD-SAT
7h 26m1 stop
Multiple Airlines Logo
10:35 am - 10:49 pmSAT-ORD
12h 14m1 stop
$162Multiple Airlines
Find Deal
Fri, Jan 30 - Sun, Feb 1
Multiple Airlines Logo
12:07 pm - 7:33 pmORD-SAT
7h 26m1 stop
Multiple Airlines Logo
8:24 pm - 2:19 pmSAT-ORD
17h 55m2 stops
$172Multiple Airlines
Find Deal
Fri, Jan 30 - Sun, Feb 1
Spirit Airlines Logo
12:44 pm - 11:52 pmORD-SAT
11h 08m1 stop
Spirit Airlines Logo
6:30 am - 5:52 pmSAT-ORD
11h 22m1 stop
$181Spirit Airlines
Find Deal
Sat, Jan 10 - Tue, Jan 13
Spirit Airlines Logo
12:44 pm - 11:52 pmORD-SAT
11h 08m1 stop
Spirit Airlines Logo
6:30 am - 8:05 pmSAT-ORD
13h 35m1 stop
$182Spirit Airlines
Find Deal
Sat, Jan 24 - Fri, Jan 30
American Airlines Logo
11:05 am - 4:47 pmSTL-SAT
5h 42m1 stop
American Airlines Logo
7:00 am - 4:30 pmSAT-STL
9h 30m1 stop
$252American Airlines
Find Deal
Fri, Jan 16 - Sun, Jan 18
Delta Logo
5:00 pm - 12:36 amMLI-SAT
7h 36m1 stop
Delta Logo
4:29 pm - 10:32 pmSAT-MLI
6h 03m1 stop
$259Delta
Find Deal
Sat, Feb 21 - Tue, Feb 24
American Airlines Logo
3:34 pm - 9:56 pmMLI-SAT
6h 22m1 stop
American Airlines Logo
5:00 am - 1:30 pmSAT-MLI
8h 30m2 stops
$264American Airlines
Find Deal
Sat, Feb 21 - Wed, Feb 25
Delta Logo
3:35 pm - 10:28 pmBMI-SAT
6h 53m1 stop
Delta Logo
8:00 am - 2:56 pmSAT-BMI
6h 56m1 stop
$350Delta
Find Deal
Tue, Feb 10 - Sat, Feb 14

Frontier flights from Illinois to San Antonio

Our best Frontier deals on Illinois to San Antonio flight tickets
Frontier
Jan 12
STL8:50 amLambert-St Louis
10h 13m
1 stop
SAT7:03 pmSan Antonio
Jan 16
SAT11:17 amSan Antonio
7h 15m
1 stop
STL6:32 pmLambert-St Louis
$156
Find similar
Frontier
Dec 22
ORD6:00 amChicago O'Hare Intl
11h 01m
1 stop
SAT5:01 pmSan Antonio
Dec 25
SAT10:18 amSan Antonio
10h 05m
1 stop
ORD8:23 pmChicago O'Hare Intl
$161
Find similar
Frontier
Jan 30
ORD12:07 pmChicago O'Hare Intl
7h 26m
1 stop
SAT7:33 pmSan Antonio
Feb 1
SAT8:24 pmSan Antonio
26h 25m
2 stops
ORD10:49 pmChicago O'Hare Intl
$162
Find similar

Spirit Airlines flights from Illinois to San Antonio

Our best Spirit Airlines deals on Illinois to San Antonio flight tickets
Spirit Airlines
Jan 10
ORD12:44 pmChicago O'Hare Intl
11h 08m
1 stop
SAT11:52 pmSan Antonio
Jan 13
SAT6:30 amSan Antonio
11h 22m
1 stop
ORD5:52 pmChicago O'Hare Intl
$181
Find similar
Spirit Airlines
Jan 24
ORD12:44 pmChicago O'Hare Intl
11h 08m
1 stop
SAT11:52 pmSan Antonio
Jan 30
SAT6:30 amSan Antonio
13h 35m
1 stop
ORD8:05 pmChicago O'Hare Intl
$182
Find similar
Spirit Airlines
Jan 10
ORD12:44 pmChicago O'Hare Intl
11h 08m
1 stop
SAT11:52 pmSan Antonio
Jan 12
SAT6:30 amSan Antonio
13h 35m
1 stop
ORD8:05 pmChicago O'Hare Intl
$183
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 22, 2025.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 1/12

8:50 am-7:03 pm

1 stop10h 13m

San Antonio

Fri 1/16

11:17 am-6:32 pm

1 stop7h 15m

$156

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Mon 12/22

6:00 am-5:01 pm

1 stop11h 01m

San Antonio

Thu 12/25

10:18 am-8:23 pm

1 stop10h 05m

$161

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Fri 1/30

12:07 pm-7:33 pm

1 stop7h 26m

San Antonio

Sun 2/1

10:35 am-10:49 pm

1 stop12h 14m

$162

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Fri 1/30

12:07 pm-7:33 pm

1 stop7h 26m

San Antonio

Sun 2/1

8:24 pm-2:19 pm

2 stops17h 55m

$172

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Sat 1/10

12:44 pm-11:52 pm

1 stop11h 08m

San Antonio

Tue 1/13

6:30 am-5:52 pm

1 stop11h 22m

$181

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Sat 1/24

12:44 pm-11:52 pm

1 stop11h 08m

San Antonio

Fri 1/30

6:30 am-8:05 pm

1 stop13h 35m

$182

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 1/16

11:05 am-4:47 pm

1 stop5h 42m

San Antonio

Sun 1/18

7:00 am-4:30 pm

1 stop9h 30m

$252

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Sat 2/21

5:00 pm-12:36 am

1 stop7h 36m

San Antonio

Tue 2/24

4:29 pm-10:32 pm

1 stop6h 03m

$259

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Sat 2/21

3:34 pm-9:56 pm

1 stop6h 22m

San Antonio

Wed 2/25

5:00 am-1:30 pm

2 stops8h 30m

$264

BloomingtonSan Antonio

BMI - SAT

BMISAT

Bloomington-Normal

Tue 2/10

3:35 pm-10:28 pm

1 stop6h 53m

San Antonio

Sat 2/14

8:00 am-2:56 pm

1 stop6h 56m

$350

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Antonio from

How to get the cheapest flight ticket from Illinois to San Antonio

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to San Antonio?

If you aren’t able to travel during the month of October, then book flights to San Antonio from Illinois during August instead. Flights to San Antonio in August, while not as cheap as those in October, still average around $347.

What is the cheapest day to depart on your flight to San Antonio?

The cheapest day to depart on your flight to San Antonio is on a Tuesday when prices can be found for as low as $392. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Sunday is $453.

What is the cheapest time of day to depart on your flight to San Antonio?

According to our data, the cheapest time of day to fly to San Antonio is at noon. momondo users have found flights departing from Illinois to San Antonio at noon for as low as $386. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to San Antonio are more costly in the morning, with an average ticket price of $425. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Illinois to San Antonio flight route?

Fly from Chicago Midway to San Antonio for the best Illinois - San Antonio flight prices

How far in advance should I book a flight to San Antonio?

You are more likely to see cheaper flights to San Antonio from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $395 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from Illinois for as low as $307 on momondo.

What cabin class options are available on Illinois to San Antonio flights?

There are 4 cabin classes available to choose from on Illinois to San Antonio flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to San Antonio flights?

You could potentially save up to 25% on your flight if you consider stops on a Illinois to San Antonio flight.

Cheap Illinois to San Antonio flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to San Antonio

Best Price Found

$158

Fastest flight time

2h 20m

Direct flights

Every day

Airports in San Antonio

1 airport
The best one-way flight to San Antonio from Illinois in the past 72 hours is $158. The best round-trip flight deal from Illinois to San Antonio found on momondo in the last 72 hours is $333.
The fastest flight from Illinois to San Antonio takes 2h 20m
Direct flights go from Illinois to San Antonio every day.
There is 1 airport near San Antonio: San Antonio (SAT)
Search flight deals

  • When did momondo last update prices for flights from Illinois to San Antonio Airport?

    Prices for flights from Illinois to San Antonio Airport were last updated today.

  • How many operators does momondo search for flights from Illinois to San Antonio Airport?

  • How old do you have to be to fly from Illinois to San Antonio Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to San Antonio Airport.

  • What documentation or ID do you need to fly to San Antonio Airport?

    The required travel and health documents for your San Antonio Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at San Antonio Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Illinois to San Antonio?

Best airlines flying from Illinois to San Antonio

Compare and see reviews for airlines that fly from Illinois to San Antonio with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $125Free CancellationRating
5.8
3,102 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $172Free CancellationRating
6.3
8,160 reviews
Search Spirit Airlines flights
SouthwestPriceFrom $203Free CancellationRating
8.0
4,252 reviews
Search Southwest flights
United AirlinesPriceFrom $212Free CancellationRating
7.4
9,033 reviews
Search United Airlines flights
American AirlinesPriceFrom $214Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
DeltaPriceFrom $258Free CancellationRating
7.9
8,002 reviews
Search Delta flights

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Boerne
Kerrville
Schertz
Pleasanton

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to San Antonio?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to San Antonio. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to San Antonio with flexible booking policies on momondo?

momondo does allow users to show only those flights to San Antonio from Illinois which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Illinois to San Antonio?

Once all potential Illinois to San Antonio flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Illinois to San Antonio right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Illinois to San Antonio flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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