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Cheap flights from San Antonio to Illinois from $105

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 9/29. 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

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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
12:39 pm - 11:32 amSAT  San Antonio-STL Lambert-St Louis
22h 53m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:10 pm - 7:25 pmSTL  Lambert-St Louis-SAT San Antonio
23h 15m1 stop Denver Intl
$248Frontier
Mon, Sep 14 - Fri, Sep 18
Frontier Logo
8:20 pm - 7:17 pmSAT  San Antonio-STL Lambert-St Louis
22h 57m1 stop Denver Intl
Frontier Logo
8:10 pm - 7:25 pmSTL  Lambert-St Louis-SAT San Antonio
23h 15m1 stop Denver Intl
$248Frontier
Fri, Sep 18 - Mon, Sep 28
United Airlines Logo
6:30 am - 9:30 amSAT  San Antonio-ORD Chicago O'Hare Intl
3h 00mnonstop
United Airlines Logo
1:30 pm - 4:31 pmORD  Chicago O'Hare Intl-SAT San Antonio
3h 01mnonstop
$297United Airlines
Sun, Sep 6 - Fri, Sep 11
Southwest Logo
7:20 am - 9:25 amSAT  San Antonio-STL Lambert-St Louis
2h 05mnonstop
Southwest Logo
8:05 pm - 10:15 pmSTL  Lambert-St Louis-SAT San Antonio
2h 10mnonstop
$297Southwest
Sat, Sep 5 - Sun, Sep 6
American Airlines Logo
5:59 am - 9:06 amSAT  San Antonio-ORD Chicago O'Hare Intl
3h 07mnonstop
American Airlines Logo
3:19 pm - 6:16 pmORD  Chicago O'Hare Intl-SAT San Antonio
2h 57mnonstop
$298American Airlines
Sat, Sep 5 - Sun, Sep 6
American Airlines Logo
1:33 pm - 4:39 pmSAT  San Antonio-ORD Chicago O'Hare Intl
3h 06mnonstop
American Airlines Logo
10:05 am - 12:53 pmORD  Chicago O'Hare Intl-SAT San Antonio
2h 48mnonstop
$298American Airlines
Sat, Sep 5 - Sun, Sep 6
Delta Logo
4:49 pm - 10:58 pmSAT  San Antonio-MLI Moline Quad-City
6h 09m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:00 am - 7:38 pmMLI  Moline Quad-City-SAT San Antonio
8h 38m1 stop Atlanta Hartsfield-Jackson
$303Delta
Wed, Nov 18 - Wed, Nov 25
Delta Logo
4:49 pm - 10:58 pmSAT  San Antonio-MLI Moline Quad-City
6h 09m1 stop Atlanta Hartsfield-Jackson
Delta Logo
5:13 pm - 12:31 amMLI  Moline Quad-City-SAT San Antonio
7h 18m1 stop Atlanta Hartsfield-Jackson
$303Delta
Wed, Nov 18 - Tue, Nov 24
Southwest Logo
7:20 am - 9:25 amSAT  San Antonio-STL Lambert-St Louis
2h 05mnonstop
Southwest Logo
12:25 pm - 9:50 pmSTL  Lambert-St Louis-SAT San Antonio
9h 25m1 stop Baltimore/Washington
$307Southwest
Sat, Sep 5 - Sun, Sep 6
United Airlines Logo
1:45 pm - 9:01 pmSAT  San Antonio-MLI Moline Quad-City
7h 16m1 stop Denver Intl
United Airlines Logo
8:13 am - 3:43 pmMLI  Moline Quad-City-SAT San Antonio
7h 30m2 stops Chicago O'Hare Intl Houston George Bush Intcntl
$308United Airlines
Wed, Sep 9 - Wed, Sep 23

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Frontier flights from San Antonio to Illinois

Our best Frontier deals on San Antonio to Illinois flight tickets
Frontier
Sep 14
SAT12:39 pmSan Antonio
22h 53m
1 stop
STL11:32 amLambert-St Louis
Sep 18
STL8:10 pmLambert-St Louis
23h 15m
1 stop
SAT7:25 pmSan Antonio
$248
Frontier
Sep 2
SAT8:26 pmSan Antonio
22h 47m
1 stop
STL7:13 pmLambert-St Louis
Sep 7
STL6:45 pmLambert-St Louis
26h 44m
1 stop
SAT9:29 pmSan Antonio
$251
Frontier
Sep 12
SAT8:20 pmSan Antonio
15h 47m
1 stop
STL12:07 pmLambert-St Louis
Sep 17
STL5:19 pmLambert-St Louis
15h 51m
1 stop
SAT9:10 amSan Antonio
$252

American Airlines flights from San Antonio to Illinois

Our best American Airlines deals on San Antonio to Illinois flight tickets
American Airlines
Sep 5
SAT1:33 pmSan Antonio
3h 06m
ORD4:39 pmChicago O'Hare Intl
Sep 6
ORD10:05 amChicago O'Hare Intl
2h 48m
SAT12:53 pmSan Antonio
$298
American Airlines
Sep 5
SAT1:43 pmSan Antonio
4h 46m
1 stop
ORD6:29 pmChicago O'Hare Intl
Sep 6
ORD3:19 pmChicago O'Hare Intl
2h 57m
SAT6:16 pmSan Antonio
$307
American Airlines
Sep 10
SAT2:03 pmSan Antonio
10h 00m
2 stops
BMI12:03 amBloomington-Normal
Sep 15
BMI4:24 pmBloomington-Normal
4h 42m
1 stop
SAT9:06 pmSan Antonio
$324

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 August 7, 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 San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Mon 9/14

12:39 pm-11:32 am

1 stop22h 53m

Lambert-St Louis

Fri 9/18

8:10 pm-7:25 pm

1 stop23h 15m

$248

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Fri 9/18

8:20 pm-7:17 pm

1 stop22h 57m

Lambert-St Louis

Mon 9/28

8:10 pm-7:25 pm

1 stop23h 15m

$248

San AntonioChicago

SAT San Antonio - ORD Chicago O'Hare Intl

SATORD

San Antonio

Sun 9/6

6:30 am-9:30 am

Nonstop3h 00m

Chicago O'Hare Intl

Fri 9/11

1:30 pm-4:31 pm

Nonstop3h 01m

$297
Quickest round-trip

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Sat 9/5

7:20 am-9:25 am

Nonstop2h 05m

Lambert-St Louis

Sun 9/6

8:05 pm-10:15 pm

Nonstop2h 10m

$297

San AntonioChicago

SAT San Antonio - ORD Chicago O'Hare Intl

SATORD

San Antonio

Sat 9/5

5:59 am-9:06 am

Nonstop3h 07m

Chicago O'Hare Intl

Sun 9/6

3:19 pm-6:16 pm

Nonstop2h 57m

$298

San AntonioChicago

SAT San Antonio - ORD Chicago O'Hare Intl

SATORD

San Antonio

Sat 9/5

1:33 pm-4:39 pm

Nonstop3h 06m

Chicago O'Hare Intl

Sun 9/6

10:05 am-12:53 pm

Nonstop2h 48m

$298

San AntonioMoline

SAT San Antonio - MLI Moline Quad-City

SATMLI

San Antonio

Wed 11/18

4:49 pm-10:58 pm

1 stop6h 09m

Moline Quad-City

Wed 11/25

11:00 am-7:38 pm

1 stop8h 38m

$303

San AntonioMoline

SAT San Antonio - MLI Moline Quad-City

SATMLI

San Antonio

Wed 11/18

4:49 pm-10:58 pm

1 stop6h 09m

Moline Quad-City

Tue 11/24

5:13 pm-12:31 am

1 stop7h 18m

$303

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Sat 9/5

7:20 am-9:25 am

Nonstop2h 05m

Lambert-St Louis

Sun 9/6

12:25 pm-9:50 pm

1 stop9h 25m

$307

San AntonioMoline

SAT San Antonio - MLI Moline Quad-City

SATMLI

San Antonio

Wed 9/9

1:45 pm-9:01 pm

1 stop7h 16m

Moline Quad-City

Wed 9/23

8:13 am-3:43 pm

2 stops7h 30m

$308

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 $341, 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 February is also cheap. Prices for this month can be found on momondo for an average of $347.

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 $472. Flights from San Antonio to Illinois on a Sunday will generally be more expensive and average around $797. 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 $408. Flights at noon are often more expensive with an average ticket price of $772.

What is the cheapest San Antonio to Illinois flight route?

Fly from San Antonio to Chicago Midway 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 $401 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 $297 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 1% 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

$249

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 $249. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $329.
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

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
2,723 reviews
Search Frontier flights
American AirlinesPriceFrom $257Free CancellationRating
7.1
11,879 reviews
Search American Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,217 reviews
Search Southwest flights
United AirlinesPriceFrom $287Free CancellationRating
7.4
10,078 reviews
Search United Airlines flights
DeltaPriceFrom $306Free CancellationRating
7.8
8,503 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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