HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$76+ Cheap flights from San Antonio (SAT) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
oct. 15 — oct. 221
mié. 10/15
mié. 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Antonio to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from San Antonio to Illinois

Keep the following information in mind while searching for San Antonio to Illinois flight deals. Data was last updated septiembre 15, 2025.

Round-trip from

$143
(CheapOair)

One-way from

$76
(United Airlines)

Popular in

March

Cheapest in

August

Average price

$342

Good round-trip deal

$305 or less

Good one-way deal

$153 or less
From San Antonio to Illinois
Search Deals
One-way flight from San Antonio to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from San Antonio to Illinois.
Search Deals
Price to beat on a one-way flight from San Antonio to Illinois.
Search Deals

Find flight deals from San Antonio to Illinois

Cheapest flights from San Antonio to Illinois
Explore the most affordable flight options available from San Antonio to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 15, 2025.

This CheapOair deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/298:20 pmSAT - STL
1 stop12h 46mFrontier
vie. 10/37:55 pmSTL - SAT
1 stop18h 32mFrontier
Deal found 9/14$143
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/284:30 pmSAT - STL
1 stop5h 24mUnited Airlines
mié. 11/58:20 amSTL - SAT
1 stop4h 44mUnited Airlines
Deal found 9/13$151
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/48:28 amSAT - STL
1 stop4h 04mAmerican Airlines
lun. 12/85:58 pmSTL - SAT
1 stop6h 27mAmerican Airlines
Deal found 9/14$159
This CheapOair deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/267:25 pmSAT - STL
1 stop13h 41mFrontier
dom. 9/282:38 pmSTL - SAT
1 stop22h 38mFrontier
Deal found 9/13$163
This Booking.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/35:40 pmSAT - ORD
1 stop5h 59mFrontier
dom. 10/51:03 pmORD - SAT
1 stop24h 13mFrontier
Deal found 9/14$167
This Priceline deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/175:45 pmSAT - MDW
1 stop6h 01mFrontier
dom. 10/196:20 amMDW - SAT
1 stop10h 32mFrontier
Deal found 9/13$167
This Priceline deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/115:32 pmSAT - ORD
1 stop6h 21mFrontier
sáb. 10/187:05 amORD - SAT
1 stop9h 32mFrontier
Deal found 9/13$168
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/147:25 pmSAT - MDW
1 stop4h 40mSouthwest
sáb. 10/186:30 amMDW - SAT
1 stop4h 10mSouthwest
Deal found 9/13$173
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/2511:33 amSAT - ORD
1 stop12h 37mFrontier
sáb. 9/278:25 amORD - SAT
1 stop6h 02mFrontier
Deal found 9/14$174
This Trip.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/65:40 pmSAT - MDW
1 stop6h 01mFrontier
vie. 10/106:24 pmMDW - SAT
1 stop22h 13mFrontier
Deal found 9/15$174
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/285:05 pmSAT - STL
1 stop4h 55mSouthwest
mié. 11/51:50 pmSTL - SAT
2 stops8h 00mSouthwest
Deal found 9/13$175
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/248:30 pmSAT - MDW
1 stop4h 15mSouthwest
lun. 10/278:15 pmMDW - SAT
Nonstop2h 50mSouthwest
Deal found 9/13$175

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated septiembre 15, 2025.
Use the filters below to find and compare flights from San Antonio to Illinois that are best for you.

Fly from

San Antonio

Fly to

Illinois

Route

Depart

Return

Price

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

lun. 9/29

8:20 pm-9:06 am

1 stop12h 46m

Lambert-St Louis

vie. 10/3

7:55 pm-2:27 pm

1 stop18h 32m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

lun. 9/29

8:20 pm-9:06 am

1 stop12h 46m

Lambert-St Louis

mié. 10/1

7:55 pm-7:15 pm

1 stop23h 20m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/28

4:30 pm-9:54 pm

1 stop5h 24m

Lambert-St Louis

mié. 11/5

8:20 am-1:04 pm

1 stop4h 44m

$151

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 12/4

8:28 am-12:32 pm

1 stop4h 04m

Lambert-St Louis

lun. 12/8

5:58 pm-12:25 am

1 stop6h 27m

$159

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 9/26

7:25 pm-9:06 am

1 stop13h 41m

Lambert-St Louis

dom. 9/28

2:38 pm-1:16 pm

1 stop22h 38m

$163

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/28

5:05 pm-10:00 pm

1 stop4h 55m

Lambert-St Louis

mié. 11/5

1:50 pm-9:50 pm

2 stops8h 00m

$175

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

jue. 10/23

8:26 pm-11:16 am

1 stop14h 50m

Chicago Midway

lun. 10/27

6:15 am-4:50 pm

1 stop10h 35m

$181

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

lun. 10/27

6:00 pm-10:22 pm

1 stop4h 22m

Lambert-St Louis

mar. 11/4

1:35 pm-9:49 pm

1 stop8h 14m

$196

San AntonioChicago

SAT - ORD

SATORD

San Antonio

lun. 10/6

5:40 pm-11:39 pm

1 stop5h 59m

Chicago O'Hare Intl

vie. 10/10

6:50 am-7:35 pm

1 stop12h 45m

$205

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/14

6:45 am-2:27 pm

1 stop7h 42m

Lambert-St Louis

jue. 10/16

6:15 am-1:15 pm

1 stop7h 00m

$213

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from San Antonio to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from San Antonio with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Antonio to Illinois

What is the cheapest month to book a flight from San Antonio to Illinois?

Currently, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $245). Flying from San Antonio to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SAT to IL?

Find hourly flight availability from San Antonio to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 15, 2025.

When flying from San Antonio to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from San Antonio to Illinois

Explore weekly flight availability from San Antonio to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated septiembre 15, 2025.

The most flights from SAT to USIL are scheduled on a Sunday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (20 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated septiembre 15, 2025.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest, United Airlines, and American Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Spirit Airlines
6.3
Okay
8,015 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Frontier
5.8
Fair
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from San Antonio to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from San Antonio to Illinois?

    Located just 7.6 mi from the city center, San Antonio (SAT) is the airport most travelers will use when flying to Illinois from San Antonio.

  • How long is the flight from San Antonio to Illinois?

    A quick flight from San Antonio to Illinois can take about 4h 04m. Frontier provides one of the quickest options available for as low as $159. San Antonio and Illinois are separated by a distance of 786 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from San Antonio to Illinois one-way?

    $76 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Southwest and Delta, with prices starting from $97 and $109, respectively.

  • What are the most popular routes from San Antonio to Illinois?

    The most popular route from San Antonio to Illinois is San Antonio - Chicago O'Hare Intl. You may also consider San Antonio - Chicago Midway or San Antonio - Lambert-St Louis.

  • What are the most reliable airlines from San Antonio to Illinois?

    Before booking your flight to Illinois from San Antonio, check out the most reliable airlines to get you to your destination on time: ANA (80%), Qatar Airways (77%), Japan Airlines( 75%).

  • What are the cheapest flights from San Antonio to Illinois?

    Looking at all options, your cheapest flight can be booked for $148. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $133 on average, our data indicates $894 when flying from San Antonio to Illinois.

  • Can I find deals for flights from San Antonio to Illinois that include hotel bookings?

    Yes. In addition to deals on San Antonio to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Antonio to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Antonio to Illinois.

  • Can I find deals for business class flights from San Antonio to Illinois?

    Yes. Cheapflights offers flight deals from San Antonio to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Antonio to Illinois?

    Currently, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $245). Flying from San Antonio to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Antonio to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to John F Kennedy Intl flights
Dallas/Fort Worth to Las Vegas flights
Dallas/Fort Worth to Seattle flights
Dallas/Fort Worth to LaGuardia flights
Dallas/Fort Worth to O'Hare Intl flights
Dallas/Fort Worth to Denver flights
Dallas/Fort Worth to Los Angeles flights
Dallas/Fort Worth to Newark flights
Dallas/Fort Worth to Boston flights
Hobby to Newark flights
Dallas/Fort Worth to Orlando flights
Hobby to Las Vegas flights
Dallas/Fort Worth to Midway flights
Hobby to LaGuardia flights
Dallas/Fort Worth to Dulles Intl flights
Hobby to John F Kennedy Intl flights
George Bush Intcntl to John F Kennedy Intl flights
Dallas/Fort Worth to San Francisco flights
Dallas/Fort Worth to Miami flights
George Bush Intcntl to Las Vegas flights
Dallas/Fort Worth to Sky Harbor Intl flights
George Bush Intcntl to Newark flights
Austin to John F Kennedy Intl flights
Dallas/Fort Worth to Baltimore flights
Love Field to Las Vegas flights
Austin to Las Vegas flights
Austin to Newark flights
Hobby to Denver flights
Dallas/Fort Worth to Reagan-National flights
Dallas/Fort Worth to Fort Lauderdale flights
George Bush Intcntl to LaGuardia flights
Dallas/Fort Worth to Atlanta flights
Hobby to Seattle flights
Hobby to Los Angeles flights
Dallas/Fort Worth to Salt Lake City flights
Dallas/Fort Worth to San Diego flights
George Bush Intcntl to Denver flights
Hobby to Orlando flights
Austin to Denver flights
Hobby to Reagan-National flights
Austin to LaGuardia flights
Dallas/Fort Worth to Portland flights
Austin to O'Hare Intl flights
Hobby to Boston flights
Hobby to Dulles Intl flights
Dallas/Fort Worth to Charlotte flights
Austin to Los Angeles flights
Austin to Seattle flights
Love Field to LaGuardia flights
George Bush Intcntl to Los Angeles flights

Top 5 airlines flying from San Antonio to Illinois

Discover the top 5 airlines that operate flights from San Antonio to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septiembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$97Average$201FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$208Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$235Average$394FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$245Average$425FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$247Average$425FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.