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Cheap flights from Illinois to San Antonio from $81

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 10/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Illinois to San Antonio

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
10:52 am - 6:32 pmORD-SAT
7h 40m1 stop
Multiple Airlines Logo
10:46 pm - 9:48 pmSAT-ORD
23h 02m1 stop
$154Multiple Airlines
Find Deal
Tue, Nov 11 - Thu, Nov 13
Frontier Logo
12:30 pm - 7:30 pmMDW-SAT
7h 00m1 stop
Frontier Logo
9:59 am - 5:22 pmSAT-MDW
7h 23m1 stop
$159Frontier
Find Deal
Thu, Nov 6 - Sun, Nov 9
Frontier Logo
5:05 am - 4:40 pmORD-SAT
11h 35m1 stop
Frontier Logo
5:35 pm - 12:11 amSAT-ORD
6h 36m1 stop
$160Frontier
Find Deal
Mon, Nov 3 - Mon, Nov 10
Spirit Airlines Logo
5:10 am - 6:32 pmORD-SAT
13h 22m1 stop
Spirit Airlines Logo
10:58 am - 11:06 pmSAT-ORD
12h 08m1 stop
$178Spirit Airlines
Find Deal
Tue, Nov 4 - Wed, Nov 5
Multiple Airlines Logo
7:15 am - 2:17 pmORD-SAT
7h 02m1 stop
Multiple Airlines Logo
7:37 pm - 9:47 amSAT-ORD
14h 10m1 stop
$180Multiple Airlines
Find Deal
Sat, Nov 8 - Tue, Nov 11
Spirit Airlines Logo
5:00 am - 6:32 pmORD-SAT
13h 32m1 stop
Spirit Airlines Logo
6:00 am - 5:04 pmSAT-ORD
11h 04m1 stop
$191Spirit Airlines
Find Deal
Wed, Dec 3 - Fri, Dec 12
Delta Logo
9:04 am - 5:18 pmSTL-SAT
8h 14m1 stop
Delta Logo
4:57 pm - 11:44 pmSAT-STL
6h 47m1 stop
$219Delta
Find Deal
Fri, Nov 14 - Mon, Nov 17
Southwest Logo
10:35 am - 4:35 pmSTL-SAT
6h 00m2 stops
Southwest Logo
5:10 pm - 9:35 pmSAT-STL
4h 25m1 stop
$224Southwest
Find Deal
Tue, Nov 4 - Tue, Nov 11
Delta Logo
5:17 pm - 12:08 amSTL-SAT
6h 51m1 stop
Delta Logo
6:32 am - 11:59 amSAT-STL
5h 27m1 stop
$239Delta
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Sat, Nov 22 - Fri, Nov 28
Southwest Logo
4:25 pm - 11:15 pmSTL-SAT
6h 50m1 stop
Southwest Logo
2:10 pm - 8:05 pmSAT-STL
5h 55m2 stops
$244Southwest
Find Deal
Wed, Oct 29 - Thu, Oct 30

Frontier flights from Illinois to San Antonio

Our best Frontier deals on Illinois to San Antonio flight tickets
Frontier
Nov 6
MDW12:30 pmChicago Midway
7h 00m
1 stop
SAT7:30 pmSan Antonio
Nov 9
SAT9:59 amSan Antonio
7h 23m
1 stop
MDW5:22 pmChicago Midway
$159
Find similar
Frontier
Nov 3
ORD5:05 amChicago O'Hare Intl
11h 35m
1 stop
SAT4:40 pmSan Antonio
Nov 10
SAT5:35 pmSan Antonio
6h 36m
1 stop
ORD12:11 amChicago O'Hare Intl
$160
Find similar
Frontier
Nov 13
ORD6:00 amChicago O'Hare Intl
13h 43m
1 stop
SAT7:43 pmSan Antonio
Nov 16
SAT8:25 pmSan Antonio
27h 50m
1 stop
ORD12:15 amChicago 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
Nov 4
ORD5:10 amChicago O'Hare Intl
13h 22m
1 stop
SAT6:32 pmSan Antonio
Nov 5
SAT10:58 amSan Antonio
12h 08m
1 stop
ORD11:06 pmChicago O'Hare Intl
$178
Find similar
Spirit Airlines
Dec 3
ORD5:00 amChicago O'Hare Intl
13h 32m
1 stop
SAT6:32 pmSan Antonio
Dec 12
SAT6:00 amSan Antonio
11h 04m
1 stop
ORD5:04 pmChicago O'Hare Intl
$191
Find similar
Spirit Airlines
Nov 9
ORD10:52 amChicago O'Hare Intl
7h 40m
1 stop
SAT6:32 pmSan Antonio
Nov 12
SAT3:23 pmSan Antonio
14h 09m
1 stop
ORD5:32 amChicago O'Hare Intl
$192
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 October 6, 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

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Tue 11/11

10:52 am-6:32 pm

1 stop7h 40m

San Antonio

Thu 11/13

10:46 pm-9:48 pm

1 stop23h 02m

$154

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Thu 11/6

12:30 pm-7:30 pm

1 stop7h 00m

San Antonio

Sun 11/9

9:59 am-5:22 pm

1 stop7h 23m

$159

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Mon 11/3

5:05 am-4:40 pm

1 stop11h 35m

San Antonio

Mon 11/10

5:35 pm-12:11 am

1 stop6h 36m

$160

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Tue 11/4

5:10 am-6:32 pm

1 stop13h 22m

San Antonio

Wed 11/5

10:58 am-11:06 pm

1 stop12h 08m

$178

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Sat 11/8

7:15 am-2:17 pm

1 stop7h 02m

San Antonio

Tue 11/11

7:37 pm-9:47 am

1 stop14h 10m

$180

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Wed 12/3

5:00 am-6:32 pm

1 stop13h 32m

San Antonio

Fri 12/12

6:00 am-5:04 pm

1 stop11h 04m

$191

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 11/14

9:04 am-5:18 pm

1 stop8h 14m

San Antonio

Mon 11/17

4:57 pm-11:44 pm

1 stop6h 47m

$219

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 11/4

10:35 am-4:35 pm

2 stops6h 00m

San Antonio

Tue 11/11

5:10 pm-9:35 pm

1 stop4h 25m

$224

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 11/22

5:17 pm-12:08 am

1 stop6h 51m

San Antonio

Fri 11/28

6:32 am-11:59 am

1 stop5h 27m

$239

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 10/29

4:25 pm-11:15 pm

1 stop6h 50m

San Antonio

Thu 10/30

2:10 pm-8:05 pm

2 stops5h 55m

$244

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 Wednesday when prices can be found for as low as $390. 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 $452.

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 $376. 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 $427. 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 O'Hare Intl 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 $402 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 $324 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 31% 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

$153

Fastest flight time

2h 15m

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 $153. The best round-trip flight deal from Illinois to San Antonio found on momondo in the last 72 hours is $308.
The fastest flight from Illinois to San Antonio takes 2h 15m
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
3,147 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $172Free CancellationRating
6.3
8,075 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $194Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $203Free CancellationRating
8.0
4,237 reviews
Search Southwest flights
United AirlinesPriceFrom $230Free CancellationRating
7.4
8,953 reviews
Search United Airlines flights
DeltaPriceFrom $258Free CancellationRating
7.9
7,969 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
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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