What is the cheapest airline that flies from Illinois to San Antonio?

Frontier, United Airlines, and Southwest are the most popular carriers operating from Illinois to San Antonio

What airlines fly to San Antonio?

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to San Antonio from Illinois according to our data. American Airlines is the first choice among our users, with 50% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 5 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.

How many flights depart from Illinois to San Antonio on average per week?

As of December 2025, there are 152 flights per week flying from Illinois to San Antonio. The most common day of the week flights depart is Thu, with 19% of flights taking off on this day.

How long does it take to fly to San Antonio?

Flight times vary depending on what airport in Illinois you fly out of and what airport in San Antonio you fly into. For example, flying from Chicago to Austin takes 2h 40m on average. On the other hand, flying from Moline to Austin takes 4h 59m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

How many flights depart from Illinois to San Antonio on average per day?

21 flights are operational daily from Illinois to San Antonio as of December 2025. The most popular departure time for this route is 7:00PM, with 40% of flights per day taking off in the evening.

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?

As of December 2025, there are 6 operators available to choose from 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.

$64 Cheap Flights from Illinois to San Antonio in 2025/26

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Find the cheapest flights from Illinois to San Antonio

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Cheap round-trip flights

Enter your travel dates to find the best prices.

5:44 pm - 12:29 pm

STL

SAT

18h 45m1 stop

10:13 am - 10:02 am

SAT

STL

23h 49m1 stop

$140Frontier

Wed, Feb 18 - Sun, Feb 22

8:43 pm - 9:40 am

ORD

SAT

12h 57m1 stop

7:14 pm - 5:07 pm

SAT

ORD

21h 53m2 stops

$175Multiple Airlines

Thu, Jan 8 - Sun, Jan 11

10:48 am - 11:52 pm

ORD

SAT

13h 04m1 stop

6:30 am - 7:41 pm

SAT

ORD

13h 11m1 stop

$176Spirit Airlines

Tue, Jan 13 - Sat, Jan 17

8:43 pm - 9:40 am

ORD

SAT

12h 57m1 stop

6:30 am - 5:52 pm

SAT

ORD

11h 22m1 stop

$179Spirit Airlines

Thu, Jan 8 - Thu, Jan 15

8:43 pm - 9:40 am

ORD

SAT

12h 57m1 stop

10:35 am - 9:03 pm

SAT

ORD

10h 28m1 stop

$180Spirit Airlines

Thu, Jan 8 - Mon, Jan 12

8:49 pm - 11:00 am

ORD

SAT

14h 11m1 stop

6:30 am - 5:52 pm

SAT

ORD

11h 22m1 stop

$182Multiple Airlines

Sun, Jan 11 - Wed, Jan 14

3:58 pm - 8:50 pm

MLI

SAT

4h 52m1 stop

6:04 am - 10:58 am

SAT

MLI

4h 54m1 stop

$217American Airlines

Wed, Jan 7 - Wed, Jan 14

10:47 am - 7:41 pm

MLI

SAT

8h 54m2 stops

1:20 pm - 8:34 pm

SAT

MLI

7h 14m1 stop

$222United Airlines

Wed, Jan 7 - Wed, Jan 14

6:41 pm - 11:26 pm

MLI

SAT

4h 45m1 stop

4:55 pm - 9:21 pm

SAT

MLI

4h 26m1 stop

$259American Airlines

Fri, Apr 24 - Mon, Apr 27

10:47 am - 7:41 pm

MLI

SAT

8h 54m2 stops

9:50 am - 4:54 pm

SAT

MLI

7h 04m2 stops

$304United Airlines

Wed, Jan 7 - Wed, Jan 14

Spirit Airlines flights from Illinois to San Antonio

Our best Spirit Airlines deals on Illinois to San Antonio flight tickets

Spirit Airlines

Jan 13

ORD10:48 amChicago O'Hare Intl

13h 04m

1 stop

SAT11:52 pmSan Antonio

Jan 17

SAT6:30 amSan Antonio

13h 11m

1 stop

ORD7:41 pmChicago O'Hare Intl

$176

Find similar

Spirit Airlines

Jan 20

ORD10:48 amChicago O'Hare Intl

13h 04m

1 stop

SAT11:52 pmSan Antonio

Jan 22

SAT6:30 amSan Antonio

13h 11m

1 stop

ORD7:41 pmChicago O'Hare Intl

$177

Find similar

Spirit Airlines

Jan 8

ORD8:43 pmChicago O'Hare Intl

12h 57m

1 stop

SAT9:40 amSan Antonio

Jan 15

SAT6:30 amSan Antonio

11h 22m

1 stop

ORD5:52 pmChicago O'Hare Intl

$179

Find similar

Frontier flights from Illinois to San Antonio

Our best Frontier deals on Illinois to San Antonio flight tickets

Frontier

Feb 18

STL5:44 pmLambert-St Louis

18h 45m

1 stop

SAT12:29 pmSan Antonio

Feb 22

SAT10:13 amSan Antonio

23h 49m

1 stop

STL10:02 amLambert-St Louis

$140

Find similar

Frontier

Jan 8

MDW12:41 pmChicago Midway

20h 37m

2 stops

SAT9:18 amSan Antonio

Jan 11

SAT7:14 pmSan Antonio

27h 55m

1 stop

MDW11:09 pmChicago Midway

$192

Find similar

Frontier

Dec 19

ORD6:00 amChicago O'Hare Intl

11h 01m

1 stop

SAT5:01 pmSan Antonio

Dec 24

SAT2:09 pmSan Antonio

10h 03m

1 stop

ORD12:12 amChicago O'Hare Intl

$198

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 2/18

5:44 pm-12:29 pm

1 stop18h 45m

San Antonio

Sun 2/22

10:13 am-10:02 am

1 stop23h 49m

$140

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Thu 1/8

8:43 pm-9:40 am

1 stop12h 57m

San Antonio

Sun 1/11

7:14 pm-5:07 pm

2 stops21h 53m

$175

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Tue 1/13

10:48 am-11:52 pm

1 stop13h 04m

San Antonio

Sat 1/17

6:30 am-7:41 pm

1 stop13h 11m

$176

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Thu 1/8

8:43 pm-9:40 am

1 stop12h 57m

San Antonio

Thu 1/15

6:30 am-5:52 pm

1 stop11h 22m

$179

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Thu 1/8

8:43 pm-9:40 am

1 stop12h 57m

San Antonio

Mon 1/12

10:35 am-9:03 pm

1 stop10h 28m

$180

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Sun 1/11

8:49 pm-11:00 am

1 stop14h 11m

San Antonio

Wed 1/14

6:30 am-5:52 pm

1 stop11h 22m

$182

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Wed 1/7

3:58 pm-8:50 pm

1 stop4h 52m

San Antonio

Wed 1/14

6:04 am-10:58 am

1 stop4h 54m

$217

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Wed 1/7

10:47 am-7:41 pm

2 stops8h 54m

San Antonio

Wed 1/14

1:20 pm-8:34 pm

1 stop7h 14m

$222

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Fri 4/24

6:41 pm-11:26 pm

1 stop4h 45m

San Antonio

Mon 4/27

4:55 pm-9:21 pm

1 stop4h 26m

$259

MolineSan Antonio

MLI - SAT

MLISAT

Moline Quad-City

Wed 1/7

10:47 am-7:41 pm

2 stops8h 54m

San Antonio

Wed 1/14

9:50 am-4:54 pm

2 stops7h 04m

$304

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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

Prices

Airlines

Other information

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 $383. 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 $444.

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 evening, with an average ticket price of $410. Departure times in the evening 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 $385 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	$227
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 $227. The best round-trip flight deal from Illinois to San Antonio found on momondo in the last 72 hours is $352.

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 in San Antonio. From Illinois there are direct flights to 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?
As of December 2025, there are 6 operators available to choose from 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?
Based on momondo bookings for flights between Illinois and San Antonio, the leading plane model is Airbus A319, making up 27.11% of the total bookings. Other popular models include Boeing 737-700 with 10.27%, Airbus A320-100/200 with 9.98%, and Boeing 737 MAX 8 with 9.87%.

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
Frontier	PriceFrom $128	Free Cancellation	Rating 5.8 3,084 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $172	Free Cancellation	Rating 6.3 8,179 reviews	Search Spirit Airlines flights
Southwest	PriceFrom $203	Free Cancellation	Rating 7.9 4,253 reviews	Search Southwest flights
United Airlines	PriceFrom $210	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights
American Airlines	PriceFrom $214	Free Cancellation	Rating 7.2 11,050 reviews	Search American Airlines flights

New Braunfels

Kerrville

Boerne

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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Cheap flights from Illinois to San Antonio from $64

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 1/25. 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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Our best Spirit Airlines deals on Illinois to San Antonio flight tickets

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Our best Frontier deals on Illinois to San Antonio flight tickets

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

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?

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

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?

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.

What is the cheapest airline that flies from Illinois to San Antonio?

Frontier, United Airlines, and Southwest are the most popular carriers operating from Illinois to San Antonio

What airlines fly to San Antonio?

How many flights depart from Illinois to San Antonio on average per day?

21 flights are operational daily from Illinois to San Antonio as of December 2025. The most popular departure time for this route is 7:00PM, with 40% of flights per day taking off in the evening.

How many flights depart from Illinois to San Antonio on average per week?

As of December 2025, there are 152 flights per week flying from Illinois to San Antonio. The most common day of the week flights depart is Thu, with 19% of flights taking off on this day.

How long does it take to fly to San Antonio?

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

Fastest flight time

Direct flights

Airports in San Antonio

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

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?

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

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

Traveling to a place near San Antonio?

Why use momondo?

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

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

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

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

An easier way to manage your San Antonio trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Texas