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$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. 17 — oct. 241
vie. 10/17
vie. 10/24
1 adult, Economy
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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 17, 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
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One-way flight from San Antonio to Illinois
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Highest demand for flights based on searches. 5% potential increase in price ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from San Antonio to Illinois.
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Price to beat on a one-way flight from San Antonio to Illinois.
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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 17, 2025.

This CheapOair deal was found by Cheapflights users on 9/16. 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.
dom. 10/268:26 pmSAT - STL
1 stop12h 41mFrontier
jue. 10/308:40 pmSTL - SAT
1 stop22h 50mFrontier
Deal found 9/16$143
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.
mar. 10/146:24 pmSAT - STL
1 stop5h 30mAmerican Airlines
mié. 10/226:00 amSTL - SAT
1 stop6h 52mAmerican Airlines
Deal found 9/14$159
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/273:22 pmSAT - ORD
1 stop6h 06mFrontier
lun. 9/2910:25 amORD - SAT
1 stop6h 05mFrontier
Deal found 9/15$159
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/310:04 amSAT - MDW
1 stop6h 48mFrontier
vie. 11/712:30 pmMDW - SAT
1 stop7h 00mFrontier
Deal found 9/16$159
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/105:35 pmSAT - ORD
1 stop6h 36mFrontier
dom. 11/1610:43 pmORD - SAT
1 stop14h 36mFrontier
Deal found 9/15$160
This Frontier deal was found by Cheapflights users on 9/16. 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. 10/1612:09 pmSAT - MDW
1 stop12h 27mFrontier
lun. 10/209:44 amMDW - SAT
1 stop7h 06mFrontier
Deal found 9/16$160
This Booking.com deal was found by Cheapflights users on 9/16. 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. 9/267:25 pmSAT - ORD
1 stop26h 03mFrontier
lun. 9/295:10 amORD - SAT
1 stop11h 20mFrontier
Deal found 9/16$162
This CheapOair deal was found by Cheapflights users on 9/16. 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.
jue. 9/259:33 pmSAT - STL
1 stop16h 20mFrontier
vie. 9/267:55 pmSTL - SAT
1 stop18h 32mFrontier
Deal found 9/16$164
This Frontier deal was found by Cheapflights users on 9/17. 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. 10/1612:09 pmSAT - STL
1 stop20h 58mFrontier
lun. 10/207:52 pmSTL - SAT
1 stop19h 22mFrontier
Deal found 9/17$167
This Booking.com deal was found by Cheapflights users on 9/16. 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. 10/107:10 pmSAT - ORD
1 stop23h 23mFrontier
lun. 10/135:05 amORD - SAT
1 stop11h 45mFrontier
Deal found 9/16$167
This CheapOair deal was found by Cheapflights users on 9/17. 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.
jue. 10/28:20 pmSAT - STL
1 stop12h 46mFrontier
lun. 10/67:55 pmSTL - SAT
1 stop19h 19mFrontier
Deal found 9/17$168
This Priceline deal was found by Cheapflights users on 9/16. 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.
mar. 10/143:59 pmSAT - ORD
1 stop7h 54mFrontier
mar. 10/217:15 amORD - SAT
1 stop7h 59mFrontier
Deal found 9/16$168

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 17, 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

dom. 10/26

8:26 pm-9:07 am

1 stop12h 41m

Lambert-St Louis

vie. 10/31

8:40 pm-2:17 pm

1 stop17h 37m

$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

jue. 10/16

12:09 pm-9:07 am

1 stop20h 58m

Lambert-St Louis

lun. 10/20

7:52 pm-3:14 pm

1 stop19h 22m

$167

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 10/2

8:20 pm-9:06 am

1 stop12h 46m

Lambert-St Louis

lun. 10/6

7:55 pm-3:14 pm

1 stop19h 19m

$168

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mié. 10/8

3:59 pm-9:07 am

1 stop17h 08m

Lambert-St Louis

jue. 10/9

7:52 pm-7:35 pm

1 stop23h 43m

$168

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

dom. 10/5

9:55 am-9:06 am

1 stop23h 11m

Lambert-St Louis

mié. 10/8

7:52 pm-11:14 am

1 stop15h 22m

$180

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

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 10/17

10:54 am-10:14 pm

1 stop11h 20m

Lambert-St Louis

dom. 10/19

10:57 am-6:30 pm

1 stop7h 33m

$220

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 10/2

9:33 pm-9:06 am

2 stops11h 33m

Lambert-St Louis

sáb. 10/4

4:58 pm-9:10 am

2 stops16h 12m

$229

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

jue. 11/13

10:46 pm-11:30 am

2 stops12h 44m

Chicago Midway

dom. 11/16

12:30 pm-7:30 pm

1 stop7h 00m

$240

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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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 17, 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 17, 2025.

The most flights from SAT to USIL are scheduled on a Monday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 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 17, 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

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
8,023 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
3,173 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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 21m. Frontier provides one of the quickest options available for as low as $259. San Antonio and Illinois are separated by a distance of 913 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 Frontier and Spirit Airlines, with prices starting from $80 and $113, 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: Republic Airways (85%), ANA (83%), United Airlines( 80%).

  • 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 $144 on average, our data indicates $932 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

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Alternative routes for San Antonio to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 17, 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%

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