Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from San Antonio to Illinois from $95

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 4/16. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from San Antonio to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:54 pm - 7:23 pm
SAT
-
STL
23h 29m
1 stop
Frontier Logo
9:18 pm - 8:14 pm
STL
-
SAT
22h 56m
1 stop
$171Frontier
Fri, May 8 - Mon, May 11
Frontier Logo
6:45 am - 9:48 am
SAT
-
STL
27h 03m
1 stop
Frontier Logo
8:16 pm - 12:19 am
STL
-
SAT
28h 03m
1 stop
$184Frontier
Thu, Apr 2 - Fri, Apr 3
Multiple Airlines Logo
7:45 am - 2:19 pm
SAT
-
ORD
6h 34m
1 stop
Multiple Airlines Logo
12:00 pm - 9:27 am
ORD
-
SAT
21h 27m
1 stop
$197Multiple Airlines
Wed, Apr 8 - Sun, Apr 12
Multiple Airlines Logo
10:22 am - 11:17 pm
SAT
-
ORD
12h 55m
1 stop
Multiple Airlines Logo
5:53 pm - 12:19 am
ORD
-
SAT
6h 26m
1 stop
$222Multiple Airlines
Thu, Apr 9 - Sat, Apr 11
Southwest Logo
9:05 am - 11:40 am
SAT
-
MDW
2h 35mnonstop
Southwest Logo
9:00 pm - 11:50 pm
MDW
-
SAT
2h 50mnonstop
$297Southwest
Tue, Apr 14 - Tue, Apr 21
Southwest Logo
5:40 pm - 9:45 pm
SAT
-
MDW
4h 05m
1 stop
Southwest Logo
9:00 pm - 11:50 pm
MDW
-
SAT
2h 50mnonstop
$303Southwest
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
6:14 pm - 11:52 pm
SAT
-
BMI
5h 38m
1 stop
American Airlines Logo
2:46 pm - 10:52 pm
BMI
-
SAT
8h 06m
2 stops
$334American Airlines
Fri, Apr 17 - Fri, Apr 24
United Airlines Logo
5:49 pm - 12:06 am
SAT
-
PIA
6h 17m
1 stop
United Airlines Logo
5:30 pm - 10:54 pm
PIA
-
SAT
5h 24m
1 stop
$339United Airlines
Thu, May 14 - Tue, May 19
American Airlines Logo
5:00 am - 12:21 pm
SAT
-
MLI
7h 21m
2 stops
American Airlines Logo
7:25 am - 12:42 pm
MLI
-
SAT
5h 17m
1 stop
$344American Airlines
Sat, May 2 - Sat, May 9
United Airlines Logo
5:30 am - 12:39 pm
SAT
-
MLI
7h 09m
2 stops
United Airlines Logo
2:31 pm - 10:42 pm
MLI
-
SAT
8h 11m
2 stops
$351United Airlines
Wed, Jun 10 - Wed, Jun 17

Spirit Airlines flights from San Antonio to Illinois

Our best Spirit Airlines deals on San Antonio to Illinois flight tickets
Spirit Airlines
Apr 8
SAT10:22 amSan Antonio
9h 29m
1 stop
ORD7:51 pmChicago O'Hare Intl
Apr 12
ORD6:10 pmChicago O'Hare Intl
15h 17m
1 stop
SAT9:27 amSan Antonio
$269
Spirit Airlines
Mar 24
SAT1:22 pmSan Antonio
6h 41m
1 stop
ORD8:03 pmChicago O'Hare Intl
Apr 12
ORD6:10 pmChicago O'Hare Intl
18h 17m
2 stops
SAT12:27 pmSan Antonio
$283
Spirit Airlines
Apr 17
SAT6:00 amSan Antonio
18h 24m
1 stop
ORD12:24 amChicago O'Hare Intl
Apr 24
ORD7:15 pmChicago O'Hare Intl
28h 36m
1 stop
SAT11:51 pmSan Antonio
$284

Frontier flights from San Antonio to Illinois

Our best Frontier deals on San Antonio to Illinois flight tickets
Frontier
May 8
SAT7:54 pmSan Antonio
23h 29m
1 stop
STL7:23 pmLambert-St Louis
May 11
STL9:18 pmLambert-St Louis
22h 56m
1 stop
SAT8:14 pmSan Antonio
$171
Frontier
Apr 2
SAT6:45 amSan Antonio
27h 03m
1 stop
STL9:48 amLambert-St Louis
Apr 3
STL8:16 pmLambert-St Louis
28h 03m
1 stop
SAT12:19 amSan Antonio
$184
Frontier
Apr 2
SAT6:45 amSan Antonio
27h 03m
1 stop
STL9:48 amLambert-St Louis
Apr 6
STL8:19 pmLambert-St Louis
28h 00m
1 stop
SAT12:19 amSan Antonio
$185

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 March 21, 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

Fri 5/8

7:54 pm-7:23 pm

1 stop23h 29m

Lambert-St Louis

Mon 5/11

9:18 pm-8:14 pm

1 stop22h 56m

$171

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 4/2

6:45 am-9:48 am

1 stop27h 03m

Lambert-St Louis

Fri 4/3

8:16 pm-12:19 am

1 stop28h 03m

$184

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 4/8

7:45 am-2:19 pm

1 stop6h 34m

Chicago O'Hare Intl

Sun 4/12

12:00 pm-9:27 am

1 stop21h 27m

$197

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 4/9

10:22 am-11:17 pm

1 stop12h 55m

Chicago O'Hare Intl

Sat 4/11

5:53 pm-12:19 am

1 stop6h 26m

$222
Quickest round-trip

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Tue 4/14

9:05 am-11:40 am

Nonstop2h 35m

Chicago Midway

Tue 4/21

9:00 pm-11:50 pm

Nonstop2h 50m

$297

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Tue 4/14

5:40 pm-9:45 pm

1 stop4h 05m

Chicago Midway

Tue 4/21

9:00 pm-11:50 pm

Nonstop2h 50m

$303

San AntonioBloomington

SAT - BMI

SATBMI

San Antonio

Fri 4/17

6:14 pm-11:52 pm

1 stop5h 38m

Bloomington-Normal

Fri 4/24

2:46 pm-10:52 pm

2 stops8h 06m

$334

San AntonioPeoria

SAT - PIA

SATPIA

San Antonio

Thu 5/14

5:49 pm-12:06 am

1 stop6h 17m

Greater Peoria

Tue 5/19

5:30 pm-10:54 pm

1 stop5h 24m

$339

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Sat 5/2

5:00 am-12:21 pm

2 stops7h 21m

Moline Quad-City

Sat 5/9

7:25 am-12:42 pm

1 stop5h 17m

$344

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Wed 6/10

5:30 am-12:39 pm

2 stops7h 09m

Moline Quad-City

Wed 6/17

2:31 pm-10:42 pm

2 stops8h 11m

$351

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 February is also cheap. Prices for this month can be found on momondo for an average of $314.

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 $451. Flights from San Antonio to Illinois on a Sunday will generally be more expensive and average around $790. 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 $472. Flights at noon are often more expensive with an average ticket price of $806.

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 $381 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.

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

$203

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 $203. The best round-trip flight deal from San Antonio to Illinois found on momondo in the last 72 hours is $369.
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 $96Free CancellationRating
5.7
3,023 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $143Free CancellationRating
6.3
8,533 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $214Free CancellationRating
7.1
11,488 reviews
Search American Airlines flights
United AirlinesPriceFrom $247Free CancellationRating
7.4
9,451 reviews
Search United Airlines flights
SouthwestPriceFrom $256Free CancellationRating
8.0
4,325 reviews
Search Southwest 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.

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 4/20
Mon 4/27
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo
Flights to New Yorkfrom $66
Flights to Los Angelesfrom $57
Flights to Orlandofrom $47
Flights to Miamifrom $53
Flights to Chicagofrom $66
Flights to San Franciscofrom $84
Flights to Las Vegasfrom $57
Flights to Washington, D.C.from $59
Flights to Bostonfrom $70
Flights to Atlantafrom $49
Flights to Dallasfrom $60
Flights to Seattlefrom $71