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Cheap flights from San Antonio to Illinois 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 San Antonio to Illinois departing on 2/27. 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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Find the cheapest flights from San Antonio to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:14 pm - 7:50 am
SAT
-
STL
12h 36m1 stop
Frontier Logo
5:11 pm - 7:03 pm
STL
-
SAT
25h 52m1 stop
$154Frontier
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
10:13 am - 10:02 am
SAT
-
STL
23h 49m1 stop
Frontier Logo
5:11 pm - 7:03 pm
STL
-
SAT
25h 52m1 stop
$158Frontier
Fri, Jan 9 - Sun, Jan 11
Multiple Airlines Logo
6:30 am - 11:33 pm
SAT
-
STL
17h 03m1 stop
Multiple Airlines Logo
4:51 pm - 7:25 pm
STL
-
SAT
26h 34m1 stop
$170Multiple Airlines
Wed, Feb 4 - Wed, Feb 25
Multiple Airlines Logo
12:45 pm - 10:33 pm
SAT
-
STL
9h 48m1 stop
Multiple Airlines Logo
3:43 pm - 9:30 am
STL
-
SAT
17h 47m1 stop
$183Multiple Airlines
Wed, Jan 7 - Wed, Jan 14
Spirit Airlines Logo
6:30 am - 5:52 pm
SAT
-
ORD
11h 22m1 stop
Spirit Airlines Logo
8:43 pm - 9:40 am
ORD
-
SAT
12h 57m1 stop
$185Spirit Airlines
Wed, Feb 4 - Sun, Feb 8
Spirit Airlines Logo
6:30 am - 7:41 pm
SAT
-
ORD
13h 11m1 stop
Spirit Airlines Logo
8:43 pm - 9:40 am
ORD
-
SAT
12h 57m1 stop
$190Spirit Airlines
Wed, Feb 4 - Sun, Feb 8
American Airlines Logo
6:06 am - 10:58 am
SAT
-
MLI
4h 52m1 stop
American Airlines Logo
3:58 pm - 8:50 pm
MLI
-
SAT
4h 52m1 stop
$238American Airlines
Fri, Jan 16 - Sun, Jan 18
United Airlines Logo
2:05 pm - 9:36 pm
SAT
-
MLI
7h 31m1 stop
United Airlines Logo
8:46 am - 4:53 pm
MLI
-
SAT
8h 07m1 stop
$259United Airlines
Fri, Jan 16 - Sun, Jan 18
United Airlines Logo
1:20 pm - 8:34 pm
SAT
-
MLI
7h 14m1 stop
United Airlines Logo
3:45 pm - 11:13 pm
MLI
-
SAT
7h 28m1 stop
$287United Airlines
Wed, Jan 7 - Sat, Jan 10
American Airlines Logo
5:00 am - 10:24 am
SAT
-
EVV
5h 24m1 stop
American Airlines Logo
4:51 pm - 11:59 pm
EVV
-
SAT
7h 08m1 stop
$407American Airlines
Mon, Dec 29 - Sat, Jan 3

Spirit Airlines flights from San Antonio to Illinois

Our best Spirit Airlines deals on San Antonio to Illinois flight tickets
Spirit Airlines
Feb 4
SAT6:30 amSan Antonio
11h 22m
1 stop
ORD5:52 pmChicago O'Hare Intl
Feb 8
ORD8:43 pmChicago O'Hare Intl
12h 57m
1 stop
SAT9:40 amSan Antonio
$185
Find similar
Spirit Airlines
Feb 4
SAT6:30 amSan Antonio
13h 11m
1 stop
ORD7:41 pmChicago O'Hare Intl
Feb 8
ORD8:43 pmChicago O'Hare Intl
12h 57m
1 stop
SAT9:40 amSan Antonio
$190
Find similar
Spirit Airlines
Jan 17
SAT10:35 amSan Antonio
10h 28m
1 stop
ORD9:03 pmChicago O'Hare Intl
Jan 18
ORD12:44 pmChicago O'Hare Intl
20h 56m
2 stops
SAT9:40 amSan Antonio
$211
Find similar

United Airlines flights from San Antonio to Illinois

Our best United Airlines deals on San Antonio to Illinois flight tickets
United Airlines
Jan 16
SAT2:05 pmSan Antonio
7h 31m
1 stop
MLI9:36 pmMoline Quad-City
Jan 18
MLI8:46 amMoline Quad-City
8h 07m
1 stop
SAT4:53 pmSan Antonio
$259
Find similar
United Airlines
Dec 24
SAT6:40 amSan Antonio
2h 51m
ORD9:31 amChicago O'Hare Intl
Dec 31
ORD3:35 pmChicago O'Hare Intl
3h 09m
SAT6:44 pmSan Antonio
$261
Find similar
United Airlines
Jan 14
SAT9:00 amSan Antonio
2h 51m
ORD11:51 amChicago O'Hare Intl
Jan 18
ORD8:00 pmChicago O'Hare Intl
3h 13m
SAT11:13 pmSan Antonio
$269
Find similar

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 December 11, 2025.
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

Thu 1/8

7:14 pm-7:50 am

1 stop12h 36m

Lambert-St Louis

Sun 1/11

5:11 pm-7:03 pm

1 stop25h 52m

$154

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 1/9

10:13 am-10:02 am

1 stop23h 49m

Lambert-St Louis

Sun 1/11

5:11 pm-7:03 pm

1 stop25h 52m

$158

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 2/4

6:30 am-11:33 pm

1 stop17h 03m

Lambert-St Louis

Wed 2/25

4:51 pm-7:25 pm

1 stop26h 34m

$170

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 1/7

12:45 pm-10:33 pm

1 stop9h 48m

Lambert-St Louis

Wed 1/14

3:43 pm-9:30 am

1 stop17h 47m

$183

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 2/4

6:30 am-5:52 pm

1 stop11h 22m

Chicago O'Hare Intl

Sun 2/8

8:43 pm-9:40 am

1 stop12h 57m

$185

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 2/4

6:30 am-7:41 pm

1 stop13h 11m

Chicago O'Hare Intl

Sun 2/8

8:43 pm-9:40 am

1 stop12h 57m

$190

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Fri 1/16

6:06 am-10:58 am

1 stop4h 52m

Moline Quad-City

Sun 1/18

3:58 pm-8:50 pm

1 stop4h 52m

$238

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Fri 1/16

2:05 pm-9:36 pm

1 stop7h 31m

Moline Quad-City

Sun 1/18

8:46 am-4:53 pm

1 stop8h 07m

$259

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Wed 1/7

1:20 pm-8:34 pm

1 stop7h 14m

Moline Quad-City

Sat 1/10

3:45 pm-11:13 pm

1 stop7h 28m

$287

San AntonioEvansville

SAT - EVV

SATEVV

San Antonio

Mon 12/29

5:00 am-10:24 am

1 stop5h 24m

Evansville Dress Regional

Sat 1/3

4:51 pm-11:59 pm

1 stop7h 08m

$407

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 $308.

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 $838. 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 evening. Flights from San Antonio to Illinois during this time can be as low as $278. Flights at noon are often more expensive with an average ticket price of $898.

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 $396 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 $263 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 32% 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

$225

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 $225. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $379.
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 O'Hare Intl (ORD), 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
5.8
3,084 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $208Free CancellationRating
6.3
8,179 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $235Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
SouthwestPriceFrom $256Free CancellationRating
7.9
4,253 reviews
Search Southwest flights
United AirlinesPriceFrom $287Free CancellationRating
7.4
9,095 reviews
Search United Airlines 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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