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Cheap flights from San Antonio to Illinois from $84

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 9/10. 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

Spirit Airlines Logo
2:54 pm - 9:58 pmSAT-ORD
7h 04m1 stop
Spirit Airlines Logo
6:30 am - 1:49 pmORD-SAT
7h 19m1 stop
$196Spirit Airlines
Find Deal
Fri, Sep 12 - Mon, Sep 15
Spirit Airlines Logo
4:49 pm - 11:59 pmSAT-ORD
7h 10m1 stop
Spirit Airlines Logo
12:46 pm - 8:52 pmORD-SAT
8h 06m1 stop
$199Spirit Airlines
Find Deal
Sat, Aug 30 - Sat, Sep 6
Frontier Logo
2:01 pm - 4:03 pmSAT-STL
26h 02m1 stop
Frontier Logo
7:55 pm - 9:10 amSTL-SAT
13h 15m1 stop
$209Frontier
Find Deal
Fri, Sep 19 - Sat, Sep 20
Frontier Logo
7:25 pm - 9:06 amSAT-STL
13h 41m1 stop
Frontier Logo
7:55 pm - 9:10 amSTL-SAT
13h 15m1 stop
$215Frontier
Find Deal
Fri, Oct 3 - Sat, Oct 4
Southwest Logo
5:00 am - 7:10 amSAT-STL
2h 10mnonstop
Southwest Logo
9:50 am - 11:55 amSTL-SAT
2h 05mnonstop
$217Southwest
Find Deal
Thu, Sep 4 - Mon, Sep 8
United Airlines Logo
1:44 pm - 8:46 pmSAT-STL
7h 02m1 stop
United Airlines Logo
6:15 am - 10:37 amSTL-SAT
4h 22m1 stop
$222United Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
American Airlines Logo
4:48 pm - 11:07 pmSAT-STL
6h 19m1 stop
American Airlines Logo
2:11 pm - 9:24 pmSTL-SAT
7h 13m1 stop
$226American Airlines
Find Deal
Thu, Sep 4 - Mon, Sep 8
United Airlines Logo
2:25 pm - 6:58 pmSAT-STL
4h 33m1 stop
United Airlines Logo
3:20 pm - 10:48 pmSTL-SAT
7h 28m2 stops
$232United Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
American Airlines Logo
7:02 am - 9:55 amSAT-ORD
2h 53mnonstop
American Airlines Logo
9:55 am - 12:52 pmORD-SAT
2h 57mnonstop
$235American Airlines
Find Deal
Sat, Oct 4 - Wed, Oct 8
Southwest Logo
1:50 pm - 4:25 pmSAT-MDW
2h 35mnonstop
Southwest Logo
8:25 am - 11:10 amMDW-SAT
2h 45mnonstop
$235Southwest
Find Deal
Sat, Sep 27 - Tue, Sep 30

Spirit Airlines flights from San Antonio to Illinois

Our best Spirit Airlines deals on San Antonio to Illinois flight tickets
Spirit Airlines
Aug 13
SAT8:28 pmSan Antonio
9h 12m
1 stop
ORD5:40 amChicago O'Hare Intl
Aug 16
ORD7:05 amChicago O'Hare Intl
12h 18m
1 stop
SAT7:23 pmSan Antonio
$187
Find similar
Spirit Airlines
Sep 12
SAT2:54 pmSan Antonio
7h 04m
1 stop
ORD9:58 pmChicago O'Hare Intl
Sep 15
ORD6:30 amChicago O'Hare Intl
7h 19m
1 stop
SAT1:49 pmSan Antonio
$196
Find similar
Spirit Airlines
Aug 30
SAT4:49 pmSan Antonio
7h 10m
1 stop
ORD11:59 pmChicago O'Hare Intl
Sep 6
ORD12:46 pmChicago O'Hare Intl
8h 06m
1 stop
SAT8:52 pmSan Antonio
$199
Find similar

Frontier flights from San Antonio to Illinois

Our best Frontier deals on San Antonio to Illinois flight tickets
Frontier
Aug 10
SAT8:14 pmSan Antonio
12h 57m
1 stop
STL9:11 amLambert-St Louis
Aug 20
STL7:54 pmLambert-St Louis
23h 39m
1 stop
SAT7:33 pmSan Antonio
$209
Find similar
Frontier
Oct 3
SAT7:25 pmSan Antonio
13h 41m
1 stop
STL9:06 amLambert-St Louis
Oct 4
STL7:55 pmLambert-St Louis
13h 15m
1 stop
SAT9:10 amSan Antonio
$215
Find similar
Frontier
Aug 22
SAT8:18 pmSan Antonio
12h 53m
1 stop
STL9:11 amLambert-St Louis
Aug 24
STL2:34 pmLambert-St Louis
22h 37m
1 stop
SAT1:11 pmSan Antonio
$219
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 August 1, 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 AntonioChicago

SAT - ORD

SATORD

San Antonio

Fri 9/12

2:54 pm-9:58 pm

1 stop7h 04m

Chicago O'Hare Intl

Mon 9/15

6:30 am-1:49 pm

1 stop7h 19m

$196

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Sat 8/30

4:49 pm-11:59 pm

1 stop7h 10m

Chicago O'Hare Intl

Sat 9/6

12:46 pm-8:52 pm

1 stop8h 06m

$199

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 9/19

2:01 pm-4:03 pm

1 stop26h 02m

Lambert-St Louis

Sat 9/20

7:55 pm-9:10 am

1 stop13h 15m

$209

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 10/3

7:25 pm-9:06 am

1 stop13h 41m

Lambert-St Louis

Sat 10/4

7:55 pm-9:10 am

1 stop13h 15m

$215

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 9/4

5:00 am-7:10 am

Nonstop2h 10m

Lambert-St Louis

Mon 9/8

9:50 am-11:55 am

Nonstop2h 05m

$217

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 8/27

1:44 pm-8:46 pm

1 stop7h 02m

Lambert-St Louis

Wed 9/3

6:15 am-10:37 am

1 stop4h 22m

$222

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 9/4

4:48 pm-11:07 pm

1 stop6h 19m

Lambert-St Louis

Mon 9/8

2:11 pm-9:24 pm

1 stop7h 13m

$226

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 8/27

2:25 pm-6:58 pm

1 stop4h 33m

Lambert-St Louis

Wed 9/3

3:20 pm-10:48 pm

2 stops7h 28m

$232

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Sat 10/4

7:02 am-9:55 am

Nonstop2h 53m

Chicago O'Hare Intl

Wed 10/8

9:55 am-12:52 pm

Nonstop2h 57m

$235

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Sat 9/27

1:50 pm-4:25 pm

Nonstop2h 35m

Chicago Midway

Tue 9/30

8:25 am-11:10 am

Nonstop2h 45m

$235

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 $285, 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 September is also cheap. Prices for this month can be found on momondo for an average of $349.

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 $447. Flights from San Antonio to Illinois on a Sunday will generally be more expensive and average around $858. 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 $847.

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 $402 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 $307 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?

No. A direct flight is the cheapest option for a flight between San Antonio to Illinois.

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

$84

Fastest flight time

2h 05m

Direct flights

Every day

Airports in Illinois

4 airports
The best one-way flight to Illinois from San Antonio in the past 72 hours is $84. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $196.
The fastest flight from San Antonio to Illinois takes 2h 05m
Direct flights go from San Antonio to Illinois every day.
There are 4 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL), Moline Quad-City (MLI)
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
Spirit AirlinesPriceFrom $111Free CancellationRating
6.3
8,054 reviews
Search Spirit Airlines flights
FrontierPriceFrom $112Free CancellationRating
5.8
3,241 reviews
Search Frontier flights
American AirlinesPriceFrom $206Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $245Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
8,904 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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