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Cheap flights from San Antonio to Illinois from $104

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 8/11. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Antonio to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
9:32 pm - 6:15 pm
SAT
-
STL
20h 43m
1 stop
Frontier Logo
7:10 pm - 8:37 pm
STL
-
SAT
25h 27m
1 stop
$245Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
10:41 pm - 1:17 am
SAT
-
STL
26h 36m
1 stop
Frontier Logo
8:10 pm - 11:21 am
STL
-
SAT
15h 11m
1 stop
$254Frontier
Thu, Oct 15 - Mon, Oct 19
American Airlines Logo
6:01 am - 10:39 am
SAT
-
MLI
4h 38m
1 stop
American Airlines Logo
4:44 pm - 11:58 pm
MLI
-
SAT
7h 14m
1 stop
$293American Airlines
Sat, Jul 25 - Sat, Aug 1
United Airlines Logo
5:27 pm - 11:14 pm
SAT
-
MLI
5h 47m
1 stop
United Airlines Logo
1:15 pm - 9:16 pm
MLI
-
SAT
8h 01m
2 stops
$298United Airlines
Tue, Aug 18 - Tue, Aug 25
United Airlines Logo
12:55 pm - 3:55 pm
SAT
-
ORD
3h 00mnonstop
United Airlines Logo
1:30 pm - 4:31 pm
ORD
-
SAT
3h 01mnonstop
$305United Airlines
Sat, Aug 15 - Tue, Aug 18
Southwest Logo
2:35 pm - 5:10 pm
SAT
-
MDW
2h 35mnonstop
Southwest Logo
8:35 pm - 11:15 pm
MDW
-
SAT
2h 40mnonstop
$305Southwest
Tue, Aug 4 - Mon, Aug 10
American Airlines Logo
5:35 pm - 11:30 pm
SAT
-
MLI
5h 55m
1 stop
American Airlines Logo
6:50 pm - 12:10 am
MLI
-
SAT
5h 20m
1 stop
$306American Airlines
Wed, Jul 1 - Wed, Jul 8
Southwest Logo
3:15 pm - 9:40 pm
SAT
-
MDW
6h 25m
1 stop
Southwest Logo
9:00 pm - 11:45 pm
MDW
-
SAT
2h 45mnonstop
$307Southwest
Wed, Jul 15 - Wed, Jul 22
Delta Logo
5:30 am - 11:23 am
SAT
-
BMI
5h 53m
1 stop
Delta Logo
4:23 pm - 12:16 am
BMI
-
SAT
7h 53m
1 stop
$309Delta
Sat, Sep 26 - Mon, Sep 28
Delta Logo
8:00 am - 1:05 pm
SAT
-
EVV
5h 05m
1 stop
Delta Logo
5:59 pm - 12:16 am
EVV
-
SAT
6h 17m
1 stop
$437Delta
Tue, Sep 22 - Sun, Oct 4

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American Airlines flights from San Antonio to Illinois

Our best American Airlines deals on San Antonio to Illinois flight tickets
American Airlines
Jul 25
SAT6:01 amSan Antonio
4h 38m
1 stop
MLI10:39 amMoline Quad-City
Aug 1
MLI4:44 pmMoline Quad-City
7h 14m
1 stop
SAT11:58 pmSan Antonio
$293
American Airlines
Jul 1
SAT5:35 pmSan Antonio
5h 55m
1 stop
MLI11:30 pmMoline Quad-City
Jul 8
MLI6:50 pmMoline Quad-City
5h 20m
1 stop
SAT12:10 amSan Antonio
$306
American Airlines
Jul 8
SAT5:35 pmSan Antonio
6h 04m
1 stop
ORD11:39 pmChicago O'Hare Intl
Jul 15
ORD10:00 amChicago O'Hare Intl
2h 50m
SAT12:50 pmSan Antonio
$307

Delta flights from San Antonio to Illinois

Our best Delta deals on San Antonio to Illinois flight tickets
Delta
Sep 26
SAT5:30 amSan Antonio
5h 53m
1 stop
BMI11:23 amBloomington-Normal
Sep 28
BMI4:23 pmBloomington-Normal
7h 53m
1 stop
SAT12:16 amSan Antonio
$309
Delta
Sep 1
SAT3:00 pmSan Antonio
5h 30m
1 stop
ORD8:30 pmChicago O'Hare Intl
Sep 9
ORD6:30 amChicago O'Hare Intl
5h 09m
1 stop
SAT11:39 amSan Antonio
$317
Delta
Sep 2
SAT5:15 amSan Antonio
5h 27m
1 stop
ORD10:42 amChicago O'Hare Intl
Sep 6
ORD5:18 pmChicago O'Hare Intl
5h 16m
1 stop
SAT10:34 pmSan Antonio
$321

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 June 18, 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

Cheapest round-trip

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 8/6

9:32 pm-6:15 pm

1 stop20h 43m

Lambert-St Louis

Mon 8/10

7:10 pm-8:37 pm

1 stop25h 27m

$245

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 10/15

10:41 pm-1:17 am

1 stop26h 36m

Lambert-St Louis

Mon 10/19

8:10 pm-11:21 am

1 stop15h 11m

$254

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Sat 7/25

6:01 am-10:39 am

1 stop4h 38m

Moline Quad-City

Sat 8/1

4:44 pm-11:58 pm

1 stop7h 14m

$293

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Tue 8/18

5:27 pm-11:14 pm

1 stop5h 47m

Moline Quad-City

Tue 8/25

1:15 pm-9:16 pm

2 stops8h 01m

$298

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Sat 8/15

12:55 pm-3:55 pm

Nonstop3h 00m

Chicago O'Hare Intl

Tue 8/18

1:30 pm-4:31 pm

Nonstop3h 01m

$305
Quickest round-trip

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Tue 8/4

2:35 pm-5:10 pm

Nonstop2h 35m

Chicago Midway

Mon 8/10

8:35 pm-11:15 pm

Nonstop2h 40m

$305

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Wed 7/1

5:35 pm-11:30 pm

1 stop5h 55m

Moline Quad-City

Wed 7/8

6:50 pm-12:10 am

1 stop5h 20m

$306

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Wed 7/15

3:15 pm-9:40 pm

1 stop6h 25m

Chicago Midway

Wed 7/22

9:00 pm-11:45 pm

Nonstop2h 45m

$307

San AntonioBloomington

SAT - BMI

SATBMI

San Antonio

Sat 9/26

5:30 am-11:23 am

1 stop5h 53m

Bloomington-Normal

Mon 9/28

4:23 pm-12:16 am

1 stop7h 53m

$309

San AntonioEvansville

SAT - EVV

SATEVV

San Antonio

Tue 9/22

8:00 am-1:05 pm

1 stop5h 05m

Evansville Dress Regional

Sun 10/4

5:59 pm-12:16 am

1 stop6h 17m

$437

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 August. Flight prices, which tend to average around $96, 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 August, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $98.

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 $464. Flights from San Antonio to Illinois on a Sunday will generally be more expensive and average around $837. 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 $476. Flights at noon are often more expensive with an average ticket price of $808.

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 from San Antonio 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 $393 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 $331 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 12% 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

$250

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 $250. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $356.
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

Frequently asked questions about flying from San Antonio to Illinois

  • 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 $96Free CancellationRating
5.6
2,880 reviews
Search Frontier flights
American AirlinesPriceFrom $235Free CancellationRating
7.1
11,686 reviews
Search American Airlines flights
SouthwestPriceFrom $256Free CancellationRating
7.9
4,237 reviews
Search Southwest flights
United AirlinesPriceFrom $287Free CancellationRating
7.4
9,859 reviews
Search United Airlines flights
DeltaPriceFrom $306Free CancellationRating
7.8
8,410 reviews
Search Delta 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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