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Cheap flights from San Antonio to Illinois from $80

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 10/31. 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

Frontier Logo
3:59 pm - 9:07 amSAT-STL
17h 08m1 stop
Frontier Logo
7:52 pm - 7:41 pmSTL-SAT
23h 49m1 stop
$143Frontier
Find Deal
Wed, Oct 8 - Wed, Oct 15
Frontier Logo
8:20 pm - 9:07 amSAT-STL
12h 47m1 stop
Frontier Logo
9:59 pm - 1:19 pmSTL-SAT
15h 20m1 stop
$153Frontier
Find Deal
Mon, Oct 6 - Fri, Oct 10
Spirit Airlines Logo
4:16 pm - 11:42 pmSAT-ORD
7h 26m1 stop
Spirit Airlines Logo
10:18 am - 10:27 pmORD-SAT
12h 09m1 stop
$190Spirit Airlines
Find Deal
Tue, Nov 11 - Wed, Nov 12
Spirit Airlines Logo
6:00 am - 5:04 pmSAT-ORD
11h 04m1 stop
Spirit Airlines Logo
10:18 am - 10:27 pmORD-SAT
12h 09m1 stop
$197Spirit Airlines
Find Deal
Wed, Dec 3 - Sat, Dec 6
American Airlines Logo
6:24 pm - 11:21 pmSAT-PIA
4h 57m1 stop
American Airlines Logo
4:10 pm - 10:57 pmPIA-SAT
6h 47m1 stop
$259American Airlines
Find Deal
Thu, Oct 23 - Mon, Oct 27
Southwest Logo
1:15 pm - 7:20 pmSAT-STL
6h 05m1 stop
Southwest Logo
5:20 am - 9:30 amSTL-SAT
4h 10m1 stop
$259Southwest
Find Deal
Wed, Dec 17 - Tue, Dec 30
American Airlines Logo
6:05 am - 10:52 amSAT-MLI
4h 47m1 stop
American Airlines Logo
6:00 am - 2:12 pmMLI-SAT
8h 12m2 stops
$264American Airlines
Find Deal
Sat, Oct 25 - Wed, Oct 29
United Airlines Logo
5:59 pm - 9:58 pmSAT-STL
3h 59m1 stop
United Airlines Logo
6:15 am - 10:51 amSTL-SAT
4h 36m1 stop
$264United Airlines
Find Deal
Thu, Dec 4 - Sat, Dec 6
United Airlines Logo
11:45 am - 9:05 pmSAT-MLI
9h 20m2 stops
United Airlines Logo
3:40 pm - 10:35 pmMLI-SAT
6h 55m2 stops
$269United Airlines
Find Deal
Sat, Oct 18 - Wed, Oct 22
Southwest Logo
12:30 pm - 2:40 pmSAT-STL
2h 10mnonstop
Southwest Logo
6:15 pm - 11:20 pmSTL-SAT
5h 05m1 stop
$297Southwest
Find Deal
Thu, Dec 4 - Tue, Dec 9

Spirit Airlines flights from San Antonio to Illinois

Our best Spirit Airlines deals on San Antonio to Illinois flight tickets
Spirit Airlines
Nov 11
SAT4:16 pmSan Antonio
7h 26m
1 stop
ORD11:42 pmChicago O'Hare Intl
Nov 12
ORD10:18 amChicago O'Hare Intl
12h 09m
1 stop
SAT10:27 pmSan Antonio
$190
Find similar
Spirit Airlines
Dec 3
SAT6:00 amSan Antonio
11h 04m
1 stop
ORD5:04 pmChicago O'Hare Intl
Dec 6
ORD10:18 amChicago O'Hare Intl
12h 09m
1 stop
SAT10:27 pmSan Antonio
$197
Find similar
Spirit Airlines
Nov 12
SAT6:00 amSan Antonio
11h 04m
1 stop
ORD5:04 pmChicago O'Hare Intl
Nov 16
ORD5:05 amChicago O'Hare Intl
10h 06m
1 stop
SAT3:11 pmSan Antonio
$203
Find similar

Frontier flights from San Antonio to Illinois

Our best Frontier deals on San Antonio to Illinois flight tickets
Frontier
Oct 8
SAT3:59 pmSan Antonio
17h 08m
1 stop
STL9:07 amLambert-St Louis
Oct 15
STL7:52 pmLambert-St Louis
23h 49m
1 stop
SAT7:41 pmSan Antonio
$143
Find similar
Frontier
Oct 6
SAT8:20 pmSan Antonio
12h 47m
1 stop
STL9:07 amLambert-St Louis
Oct 10
STL9:59 pmLambert-St Louis
15h 20m
1 stop
SAT1:19 pmSan Antonio
$153
Find similar
Frontier
Nov 2
SAT8:25 pmSan Antonio
27h 50m
1 stop
ORD12:15 amChicago O'Hare Intl
Nov 6
ORD6:00 amChicago O'Hare Intl
13h 30m
1 stop
SAT7:30 pmSan Antonio
$159
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 September 23, 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

Wed 10/8

3:59 pm-9:07 am

1 stop17h 08m

Lambert-St Louis

Wed 10/15

7:52 pm-7:41 pm

1 stop23h 49m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 10/6

8:20 pm-9:07 am

1 stop12h 47m

Lambert-St Louis

Fri 10/10

9:59 pm-1:19 pm

1 stop15h 20m

$153

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 11/11

4:16 pm-11:42 pm

1 stop7h 26m

Chicago O'Hare Intl

Wed 11/12

10:18 am-10:27 pm

1 stop12h 09m

$190

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 12/3

6:00 am-5:04 pm

1 stop11h 04m

Chicago O'Hare Intl

Sat 12/6

10:18 am-10:27 pm

1 stop12h 09m

$197

San AntonioPeoria

SAT - PIA

SATPIA

San Antonio

Thu 10/23

6:24 pm-11:21 pm

1 stop4h 57m

Greater Peoria

Mon 10/27

4:10 pm-10:57 pm

1 stop6h 47m

$259

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 12/17

1:15 pm-7:20 pm

1 stop6h 05m

Lambert-St Louis

Tue 12/30

5:20 am-9:30 am

1 stop4h 10m

$259

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Sat 10/25

6:05 am-10:52 am

1 stop4h 47m

Moline Quad-City

Wed 10/29

6:00 am-2:12 pm

2 stops8h 12m

$264

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/4

5:59 pm-9:58 pm

1 stop3h 59m

Lambert-St Louis

Sat 12/6

6:15 am-10:51 am

1 stop4h 36m

$264

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Sat 10/18

11:45 am-9:05 pm

2 stops9h 20m

Moline Quad-City

Wed 10/22

3:40 pm-10:35 pm

2 stops6h 55m

$269

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/4

12:30 pm-2:40 pm

Nonstop2h 10m

Lambert-St Louis

Tue 12/9

6:15 pm-11:20 pm

1 stop5h 05m

$297

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 $308, 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 $332.

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 $854. 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 $906.

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 $317 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

$193

Fastest flight time

2h 05m

Direct flights

Every day

Airports in Illinois

2 airports
The best one-way flight to Illinois from San Antonio in the past 72 hours is $193. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $305.
The fastest flight from San Antonio to Illinois takes 2h 05m
Direct flights go from San Antonio to Illinois every day.
There are 2 airports near Illinois: 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
3,165 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $208Free CancellationRating
6.3
8,041 reviews
Search Spirit Airlines flights
SouthwestPriceFrom $235Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
American AirlinesPriceFrom $235Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $247Free CancellationRating
7.4
8,926 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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