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Cheap flights from San Antonio to Illinois from $48

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Antonio to Illinois departing on 2/24. 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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Find the cheapest flights from San Antonio to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
1:57 pm - 11:59 pm
SAT
-
STL
10h 02m
1 stop
Frontier Logo
10:11 pm - 9:58 am
STL
-
SAT
11h 47m
1 stop
$148Frontier
Mon, Feb 23 - Thu, Feb 26
Multiple Airlines Logo
10:26 am - 6:51 am
SAT
-
STL
20h 25m
2 stops
Multiple Airlines Logo
3:49 pm - 1:12 pm
STL
-
SAT
21h 23m
1 stop
$167Multiple Airlines
Tue, Feb 24 - Wed, Feb 25
Spirit Airlines Logo
6:00 am - 7:47 pm
SAT
-
ORD
13h 47m
1 stop
Spirit Airlines Logo
8:16 pm - 9:30 am
ORD
-
SAT
13h 14m
1 stop
$182Spirit Airlines
Sat, Feb 21 - Mon, Feb 23
Spirit Airlines Logo
10:26 am - 12:40 am
SAT
-
ORD
14h 14m
2 stops
Spirit Airlines Logo
12:44 pm - 9:30 am
ORD
-
SAT
20h 46m
2 stops
$188Spirit Airlines
Tue, Mar 3 - Mon, Mar 9
American Airlines Logo
5:00 am - 11:01 am
SAT
-
STL
6h 01m
1 stop
American Airlines Logo
6:37 pm - 11:56 pm
STL
-
SAT
5h 19m
1 stop
$201American Airlines
Sun, Mar 1 - Tue, Mar 10
American Airlines Logo
5:19 am - 12:47 pm
SAT
-
PIA
7h 28m
1 stop
American Airlines Logo
5:22 pm - 11:59 pm
PIA
-
SAT
6h 37m
1 stop
$294American Airlines
Thu, Mar 12 - Mon, Mar 16
Delta Logo
12:26 pm - 5:18 pm
SAT
-
EVV
4h 52m
1 stop
Delta Logo
10:08 am - 3:04 pm
EVV
-
SAT
4h 56m
1 stop
$339Delta
Sat, May 2 - Sat, May 9
United Airlines Logo
2:10 pm - 9:26 pm
SAT
-
PIA
7h 16m
1 stop
United Airlines Logo
5:45 pm - 11:12 pm
PIA
-
SAT
5h 27m
1 stop
$379United Airlines
Tue, Feb 17 - Sat, Feb 21
United Airlines Logo
5:20 am - 2:10 pm
SAT
-
PIA
8h 50m
2 stops
United Airlines Logo
5:45 pm - 11:12 pm
PIA
-
SAT
5h 27m
1 stop
$384United Airlines
Tue, Feb 17 - Sat, Feb 21
Delta Logo
4:29 pm - 10:20 pm
SAT
-
EVV
5h 51m
1 stop
Delta Logo
5:59 pm - 12:35 am
EVV
-
SAT
6h 36m
1 stop
$461Delta
Wed, Feb 18 - Sun, Feb 22

Frontier flights from San Antonio to Illinois

Our best Frontier deals on San Antonio to Illinois flight tickets
Frontier
Feb 23
SAT1:57 pmSan Antonio
10h 02m
1 stop
STL11:59 pmLambert-St Louis
Feb 26
STL10:11 pmLambert-St Louis
11h 47m
1 stop
SAT9:58 amSan Antonio
$148
Frontier
Feb 23
SAT1:57 pmSan Antonio
10h 02m
1 stop
STL11:59 pmLambert-St Louis
Feb 27
STL1:59 pmLambert-St Louis
5h 38m
1 stop
SAT7:37 pmSan Antonio
$189
Frontier
May 6
SAT3:14 pmSan Antonio
18h 36m
1 stop
ORD9:50 amChicago O'Hare Intl
May 11
ORD10:55 amChicago O'Hare Intl
27h 24m
1 stop
SAT2:19 pmSan Antonio
$191

Spirit Airlines flights from San Antonio to Illinois

Our best Spirit Airlines deals on San Antonio to Illinois flight tickets
Spirit Airlines
Feb 21
SAT6:00 amSan Antonio
13h 47m
1 stop
ORD7:47 pmChicago O'Hare Intl
Feb 23
ORD8:16 pmChicago O'Hare Intl
13h 14m
1 stop
SAT9:30 amSan Antonio
$182
Spirit Airlines
Mar 3
SAT10:26 amSan Antonio
14h 14m
2 stops
ORD12:40 amChicago O'Hare Intl
Mar 9
ORD12:44 pmChicago O'Hare Intl
20h 46m
2 stops
SAT9:30 amSan Antonio
$188
Spirit Airlines
Mar 9
SAT10:26 amSan Antonio
24h 56m
1 stop
ORD11:22 amChicago O'Hare Intl
Mar 12
ORD6:10 pmChicago O'Hare Intl
15h 17m
1 stop
SAT9:27 amSan Antonio
$189

momondo Fare Finder

 
Customize your flight search to find flights from San Antonio to Illinois 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 February 4, 2026.
Use the filters below to find and compare flights from San Antonio to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 2/23

1:57 pm-11:59 pm

1 stop10h 02m

Lambert-St Louis

Thu 2/26

10:11 pm-9:58 am

1 stop11h 47m

$148

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 2/24

10:26 am-6:51 am

2 stops20h 25m

Lambert-St Louis

Wed 2/25

3:49 pm-1:12 pm

1 stop21h 23m

$167

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Sat 2/21

6:00 am-7:47 pm

1 stop13h 47m

Chicago O'Hare Intl

Mon 2/23

8:16 pm-9:30 am

1 stop13h 14m

$182

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 3/3

10:26 am-12:40 am

2 stops14h 14m

Chicago O'Hare Intl

Mon 3/9

12:44 pm-9:30 am

2 stops20h 46m

$188

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sun 3/1

5:00 am-11:01 am

1 stop6h 01m

Lambert-St Louis

Tue 3/10

6:37 pm-11:56 pm

1 stop5h 19m

$201

San AntonioPeoria

SAT - PIA

SATPIA

San Antonio

Thu 3/12

5:19 am-12:47 pm

1 stop7h 28m

Greater Peoria

Mon 3/16

5:22 pm-11:59 pm

1 stop6h 37m

$294

San AntonioEvansville

SAT - EVV

SATEVV

San Antonio

Sat 5/2

12:26 pm-5:18 pm

1 stop4h 52m

Evansville Dress Regional

Sat 5/9

10:08 am-3:04 pm

1 stop4h 56m

$339

San AntonioPeoria

SAT - PIA

SATPIA

San Antonio

Tue 2/17

2:10 pm-9:26 pm

1 stop7h 16m

Greater Peoria

Sat 2/21

5:45 pm-11:12 pm

1 stop5h 27m

$379

San AntonioPeoria

SAT - PIA

SATPIA

San Antonio

Tue 2/17

5:20 am-2:10 pm

2 stops8h 50m

Greater Peoria

Sat 2/21

5:45 pm-11:12 pm

1 stop5h 27m

$384

San AntonioEvansville

SAT - EVV

SATEVV

San Antonio

Wed 2/18

4:29 pm-10:20 pm

1 stop5h 51m

Evansville Dress Regional

Sun 2/22

5:59 pm-12:35 am

1 stop6h 36m

$461

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 Illinois from

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

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 Illinois?

The cheapest month to fly to Illinois from San Antonio is in September. Flight prices, which tend to average around $305, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $316.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from San Antonio to Illinois is on a Thursday when prices can be found for as low as $443. Flights from San Antonio to Illinois on a Sunday will generally be more expensive and average around $829. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Our most recent data shows that the best time of day to fly to Illinois is in the morning. Flights from San Antonio to Illinois during this time can be as low as $469. Flights at noon are often more expensive with an average ticket price of $853.

What is the cheapest San Antonio to Illinois flight route?

Fly from San Antonio to Chicago O'Hare Intl for the best San Antonio - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from San Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $386 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from San Antonio for as low as $279 on momondo.

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

There are 4 cabin classes available to choose from on San Antonio to Illinois 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 San Antonio to Illinois flights?

You could potentially save up to 33% on your flight if you consider stops on a San Antonio to Illinois flight.

Cheap San Antonio to Illinois flight deals and tips

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

Best Price Found

$213

Fastest flight time

2h 05m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from San Antonio in the past 72 hours is $213. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $350.
The fastest flight from San Antonio to Illinois takes 2h 05m
Direct flights go from San Antonio to Illinois every day.
There are 98 airports in Illinois. From San Antonio there are direct flights to Chicago Midway (MDW), Lambert-St Louis (STL).
Search flight deals

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

    Prices for flights from San Antonio Airport to Illinois are updated daily.

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

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

    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 San Antonio Airport to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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

Best airlines flying from San Antonio to Illinois

Compare and see reviews for airlines that fly from San Antonio to Illinois with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $97Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $191Free CancellationRating
6.3
8,405 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $235Free CancellationRating
7.2
11,216 reviews
Search American Airlines flights
United AirlinesPriceFrom $247Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
SouthwestPriceFrom $256Free CancellationRating
8.0
4,272 reviews
Search Southwest flights

Why use momondo?

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

It is quick and easy to find San Antonio to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

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

Flights from San Antonio to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from San Antonio.

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

Of course. momondo tracks the price of San Antonio to Illinois 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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