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Cheap flights from San Antonio to Illinois from $99

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 5/18. 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
9:09 pm - 8:11 pm
SAT
-
STL
23h 02m
1 stop
Frontier Logo
8:08 pm - 6:59 pm
STL
-
SAT
22h 51m
1 stop
$205Frontier
Thu, May 28 - Sun, May 31
Frontier Logo
9:09 pm - 8:11 pm
SAT
-
STL
23h 02m
1 stop
Frontier Logo
8:08 pm - 6:59 pm
STL
-
SAT
22h 51m
1 stop
$218Frontier
Thu, May 28 - Mon, Jun 1
United Airlines Logo
5:32 pm - 11:14 pm
SAT
-
MLI
5h 42m
1 stop
United Airlines Logo
3:44 pm - 10:55 pm
MLI
-
SAT
7h 11m
1 stop
$266United Airlines
Wed, Aug 5 - Tue, Aug 11
American Airlines Logo
6:05 am - 11:03 am
SAT
-
CMI
4h 58m
1 stop
American Airlines Logo
6:36 pm - 12:10 am
CMI
-
SAT
5h 34m
1 stop
$270American Airlines
Tue, Jun 30 - Tue, Jul 7
American Airlines Logo
6:24 pm - 12:11 am
SAT
-
MLI
5h 47m
1 stop
American Airlines Logo
6:50 pm - 12:10 am
MLI
-
SAT
5h 20m
1 stop
$273American Airlines
Tue, Jun 30 - Tue, Jul 14
Delta Logo
5:00 pm - 10:34 pm
SAT
-
MLI
5h 34m
1 stop
Delta Logo
5:56 am - 1:32 pm
MLI
-
SAT
7h 36m
1 stop
$284Delta
Wed, Jun 24 - Wed, Jul 15
United Airlines Logo
6:40 am - 9:38 am
SAT
-
ORD
2h 58mnonstop
United Airlines Logo
7:59 pm - 10:58 pm
ORD
-
SAT
2h 59mnonstop
$297United Airlines
Wed, May 27 - Wed, Jun 10
Southwest Logo
9:20 am - 11:55 am
SAT
-
MDW
2h 35mnonstop
Southwest Logo
9:00 pm - 11:40 pm
MDW
-
SAT
2h 40mnonstop
$297Southwest
Tue, Jun 16 - Tue, Jun 23
Southwest Logo
2:35 pm - 5:10 pm
SAT
-
MDW
2h 35mnonstop
Southwest Logo
1:55 pm - 5:55 pm
MDW
-
SAT
4h 00m
1 stop
$303Southwest
Wed, Aug 12 - Wed, Aug 26
Delta Logo
5:00 pm - 10:30 pm
SAT
-
BMI
5h 30m
1 stop
Delta Logo
4:14 pm - 10:31 pm
BMI
-
SAT
6h 17m
1 stop
$309Delta
Wed, May 27 - Sun, May 31

United Airlines flights from San Antonio to Illinois

Our best United Airlines deals on San Antonio to Illinois flight tickets
United Airlines
Aug 5
SAT5:32 pmSan Antonio
5h 42m
1 stop
MLI11:14 pmMoline Quad-City
Aug 11
MLI3:44 pmMoline Quad-City
7h 11m
1 stop
SAT10:55 pmSan Antonio
$266
United Airlines
May 27
SAT6:40 amSan Antonio
2h 58m
ORD9:38 amChicago O'Hare Intl
Jun 10
ORD7:59 pmChicago O'Hare Intl
2h 59m
SAT10:58 pmSan Antonio
$297
United Airlines
Jun 2
SAT1:20 pmSan Antonio
3h 01m
ORD4:21 pmChicago O'Hare Intl
Jun 9
ORD7:59 pmChicago O'Hare Intl
2h 59m
SAT10:58 pmSan Antonio
$305

American Airlines flights from San Antonio to Illinois

Our best American Airlines deals on San Antonio to Illinois flight tickets
American Airlines
Jun 30
SAT6:05 amSan Antonio
4h 58m
1 stop
CMI11:03 amChampaign University-Willard
Jul 7
CMI6:36 pmChampaign University-Willard
5h 34m
1 stop
SAT12:10 amSan Antonio
$270
American Airlines
Jun 30
SAT6:24 pmSan Antonio
5h 47m
1 stop
MLI12:11 amMoline Quad-City
Jul 14
MLI6:50 pmMoline Quad-City
5h 20m
1 stop
SAT12:10 amSan Antonio
$273
American Airlines
Jun 16
SAT6:00 amSan Antonio
3h 02m
ORD9:02 amChicago O'Hare Intl
Jun 23
ORD9:00 pmChicago O'Hare Intl
2h 59m
SAT11:59 pmSan Antonio
$298

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 May 5, 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 5/28

9:09 pm-8:11 pm

1 stop23h 02m

Lambert-St Louis

Sun 5/31

8:08 pm-6:59 pm

1 stop22h 51m

$205

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 5/28

9:09 pm-8:11 pm

1 stop23h 02m

Lambert-St Louis

Mon 6/1

8:08 pm-6:59 pm

1 stop22h 51m

$218

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Wed 8/5

5:32 pm-11:14 pm

1 stop5h 42m

Moline Quad-City

Tue 8/11

3:44 pm-10:55 pm

1 stop7h 11m

$266

San AntonioChampaign

SAT - CMI

SATCMI

San Antonio

Tue 6/30

6:05 am-11:03 am

1 stop4h 58m

Champaign University-Willard

Tue 7/7

6:36 pm-12:10 am

1 stop5h 34m

$270

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Tue 6/30

6:24 pm-12:11 am

1 stop5h 47m

Moline Quad-City

Tue 7/14

6:50 pm-12:10 am

1 stop5h 20m

$273

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Wed 6/24

5:00 pm-10:34 pm

1 stop5h 34m

Moline Quad-City

Wed 7/15

5:56 am-1:32 pm

1 stop7h 36m

$284

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 5/27

6:40 am-9:38 am

Nonstop2h 58m

Chicago O'Hare Intl

Wed 6/10

7:59 pm-10:58 pm

Nonstop2h 59m

$297
Quickest round-trip

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Tue 6/16

9:20 am-11:55 am

Nonstop2h 35m

Chicago Midway

Tue 6/23

9:00 pm-11:40 pm

Nonstop2h 40m

$297

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Wed 8/12

2:35 pm-5:10 pm

Nonstop2h 35m

Chicago Midway

Wed 8/26

1:55 pm-5:55 pm

1 stop4h 00m

$303

San AntonioBloomington

SAT - BMI

SATBMI

San Antonio

Wed 5/27

5:00 pm-10:30 pm

1 stop5h 30m

Bloomington-Normal

Sun 5/31

4:14 pm-10:31 pm

1 stop6h 17m

$309

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 $444. Flights from San Antonio to Illinois on a Sunday will generally be more expensive and average around $789. 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 $792.

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 $387 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 $294 on momondo.

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

$221

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 $221. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $367.
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
2,964 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $98Free CancellationRating
6.3
8,638 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $217Free CancellationRating
7.1
11,667 reviews
Search American Airlines flights
United AirlinesPriceFrom $247Free CancellationRating
7.4
9,684 reviews
Search United Airlines flights
SouthwestPriceFrom $256Free CancellationRating
7.9
4,305 reviews
Search Southwest flights
DeltaPriceFrom $306Free CancellationRating
7.9
8,459 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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