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$72+ 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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
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 agosto 20, 2025.

Round-trip from

$143
(CheapOair)

One-way from

$72
(Mytrip)

Popular in

March

Cheapest in

August

Average price

$285

Good round-trip deal

$299 or less

Good one-way deal

$148 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 ($20 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 August 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 agosto 20, 2025.

This CheapOair deal was found by Cheapflights users on 8/18. 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. 9/2612:41 pmSAT - STL
1 stop20h 25mFrontier
dom. 9/287:55 pmSTL - SAT
1 stop23h 20mFrontier
Deal found 8/18$143
This CheapOair deal was found by Cheapflights users on 8/18. 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. 10/178:20 pmSAT - STL
1 stop12h 47mFrontier
dom. 10/197:52 pmSTL - SAT
1 stop23h 43mFrontier
Deal found 8/18$177
This CheapOair deal was found by Cheapflights users on 8/19. 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. 9/189:33 pmSAT - STL
1 stop16h 20mFrontier
jue. 9/257:55 pmSTL - SAT
1 stop22h 35mFrontier
Deal found 8/19$183
This Booking.com deal was found by Cheapflights users on 8/18. 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.
lun. 10/68:20 pmSAT - ORD
1 stop27h 33mFrontier
vie. 10/1010:51 amORD - SAT
1 stop8h 44mFrontier
Deal found 8/18$184
This Justfly.com deal was found by Cheapflights users on 8/19. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/411:33 amSAT - ORD
1 stop12h 37mMultiple Airlines
mar. 9/911:15 amORD - SAT
1 stop9h 37mMultiple Airlines
Deal found 8/19$185
This Frontier deal was found by Cheapflights users on 8/18. 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. 9/411:33 amSAT - ORD
2 stops11h 47mFrontier
lun. 9/85:10 amORD - SAT
1 stop11h 20mFrontier
Deal found 8/18$187
This Frontier deal was found by Cheapflights users on 8/18. 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. 9/411:33 amSAT - MDW
2 stops19h 38mFrontier
lun. 9/86:20 amMDW - SAT
1 stop10h 10mFrontier
Deal found 8/18$187
This Frontier deal was found by Cheapflights users on 8/19. 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.
vie. 9/512:41 pmSAT - MDW
2 stops21h 47mFrontier
vie. 9/126:20 amMDW - SAT
1 stop10h 10mFrontier
Deal found 8/19$189
This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/124:16 pmSAT - ORD
1 stop7h 26mMultiple Airlines
dom. 11/166:00 amORD - SAT
1 stop13h 30mMultiple Airlines
Deal found 8/18$190
This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/265:40 pmSAT - ORD
1 stop6h 30mMultiple Airlines
dom. 9/286:30 amORD - SAT
1 stop7h 19mMultiple Airlines
Deal found 8/18$191
This FlightHub deal was found by Cheapflights users on 8/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/135:45 pmSAT - MDW
1 stop19h 53mFrontier
jue. 10/166:24 pmMDW - SAT
1 stop25h 11mFrontier
Deal found 8/19$191
This Mytrip deal was found by Cheapflights users on 8/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/195:40 pmSAT - ORD
1 stop6h 30mFrontier
dom. 9/211:03 pmORD - SAT
1 stop24h 13mFrontier
Deal found 8/18$192

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 agosto 20, 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

vie. 10/10

8:20 pm-9:07 am

1 stop12h 47m

Lambert-St Louis

lun. 10/13

7:52 pm-3:14 pm

1 stop19h 22m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 9/26

12:41 pm-9:06 am

1 stop20h 25m

Lambert-St Louis

dom. 9/28

7:55 pm-7:15 pm

1 stop23h 20m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 10/3

12:41 pm-9:06 am

1 stop20h 25m

Lambert-St Louis

lun. 10/6

7:55 pm-3:14 pm

1 stop19h 19m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 9/25

8:20 pm-9:06 am

1 stop12h 46m

Lambert-St Louis

dom. 9/28

7:55 pm-7:15 pm

1 stop23h 20m

$177

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 10/17

8:20 pm-9:07 am

1 stop12h 47m

Lambert-St Louis

dom. 10/19

7:52 pm-7:35 pm

1 stop23h 43m

$177

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 9/18

9:33 pm-1:53 pm

1 stop16h 20m

Lambert-St Louis

jue. 9/25

7:55 pm-6:30 pm

1 stop22h 35m

$183

San AntonioChicago

SAT - ORD

SATORD

San Antonio

lun. 10/6

8:20 pm-11:53 pm

1 stop27h 33m

Chicago O'Hare Intl

vie. 10/10

10:51 am-7:35 pm

1 stop8h 44m

$184

San AntonioChicago

SAT - ORD

SATORD

San Antonio

jue. 9/4

11:33 am-12:10 am

1 stop12h 37m

Chicago O'Hare Intl

mar. 9/9

11:15 am-8:52 pm

1 stop9h 37m

$185

San AntonioChicago

SAT - ORD

SATORD

San Antonio

jue. 9/4

11:33 am-11:20 pm

2 stops11h 47m

Chicago O'Hare Intl

lun. 9/8

5:10 am-4:30 pm

1 stop11h 20m

$187

San AntonioChicago

SAT - ORD

SATORD

San Antonio

dom. 10/12

8:26 pm-12:59 am

1 stop28h 33m

Chicago O'Hare Intl

jue. 10/16

6:39 pm-4:50 pm

1 stop22h 11m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/19

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 agosto 20, 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 agosto 20, 2025.

The most flights from SAT to USIL are scheduled on a Monday (26 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (21 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 agosto 20, 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
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

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
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

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
8,928 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

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
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

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
8,039 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

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
3,207 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

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 5h 19m. Frontier provides one of the quickest options available for as low as $259. San Antonio and Illinois are separated by a distance of 936 mi. This flight may include one or multiple stops.

  • 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 (82%), Japan Airlines (75%), Emirates( 75%).

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

    Looking at all options, your cheapest flight can be booked for $128. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $177 on average our data indicates $955 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 agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$114Average$201FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$191Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$210Average$415FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$245Average$436FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$266Average$433FlexibilityNo cancel feeOn-time69%

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