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$68+ 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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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Cheap 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 January 21, 2026.

This CheapOair deal was found by Cheapflights users on 1/20. 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.
Thu 2/191:57 pm
SAT
-
STL
1 stop10h 02m
Frontier
Wed 2/254:51 pm
STL
-
SAT
1 stop26h 34m
Frontier
Deal found 1/20$160
This Kiwi.com deal was found by Cheapflights users on 1/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:04 pm
SAT
-
STL
1 stop13h 47m
Frontier
Fri 2/271:59 pm
STL
-
SAT
1 stop29h 02m
Frontier
Deal found 1/21$167
This Booking.com deal was found by Cheapflights users on 1/20. 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.
Mon 2/239:20 am
SAT
-
STL
1 stop10h 42m
Frontier
Wed 2/253:49 pm
STL
-
SAT
1 stop21h 23m
Frontier
Deal found 1/20$171
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:00 am
SAT
-
STL
1 stop16h 27m
Multiple Airlines
Sat 2/288:17 pm
STL
-
SAT
1 stop20h 02m
Multiple Airlines
Deal found 1/20$174
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/121:57 pm
SAT
-
STL
1 stop10h 02m
Frontier
Sat 2/148:17 pm
STL
-
SAT
1 stop20h 02m
Frontier
Deal found 1/20$197
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/191:57 pm
SAT
-
STL
2 stops16h 54m
Multiple Airlines
Wed 2/253:49 pm
STL
-
SAT
1 stop8h 10m
Multiple Airlines
Deal found 1/20$208
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:12 pm
SAT
-
STL
2 stops27h 14m
Frontier
Sat 2/288:17 pm
STL
-
SAT
1 stop20h 02m
Frontier
Deal found 1/20$210
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/186:12 pm
SAT
-
STL
2 stops27h 14m
Multiple Airlines
Wed 2/253:49 pm
STL
-
SAT
1 stop8h 10m
Multiple Airlines
Deal found 1/20$214
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/186:12 pm
SAT
-
ORD
1 stop29h 02m
Frontier
Wed 2/256:02 pm
ORD
-
SAT
2 stops19h 10m
Frontier
Deal found 1/19$214
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:22 pm
SAT
-
STL
2 stops34h 29m
Multiple Airlines
Wed 2/253:49 pm
STL
-
SAT
1 stop8h 10m
Multiple Airlines
Deal found 1/20$215
This Kiwi.com deal was found by Cheapflights users on 1/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/58:25 pm
SAT
-
ORD
1 stop28h 42m
Frontier
Thu 3/1210:53 am
ORD
-
SAT
1 stop22h 13m
Frontier
Deal found 1/18$215
This CheapOair deal was found by Cheapflights users on 1/19. 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.
Wed 2/186:12 pm
SAT
-
ORD
1 stop29h 02m
Frontier
Sun 2/225:05 am
ORD
-
SAT
1 stop11h 14m
Frontier
Deal found 1/19$216

Find 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 January 21, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$160
(CheapOair)

One-way from

$68
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$398

Good round-trip deal

$332 or less

Good one-way deal

$248 or less
Provider with most accurate pricing for San Antonio-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Antonio-Chicago (CHI) flights.
Search Deals
From San Antonio to Illinois
Search Deals
One-way flight from San Antonio to Illinois
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($9 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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

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 January 21, 2026.
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

Mon 2/23

9:20 am-8:02 pm

1 stop10h 42m

Lambert-St Louis

Wed 2/25

3:49 pm-1:12 pm

1 stop21h 23m

$171

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 2/25

6:00 am-10:27 pm

1 stop16h 27m

Lambert-St Louis

Sat 2/28

8:17 pm-4:19 pm

1 stop20h 02m

$174

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 2/25

6:12 pm-9:26 pm

2 stops27h 14m

Lambert-St Louis

Sat 2/28

8:17 pm-4:19 pm

1 stop20h 02m

$182

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 2/12

1:57 pm-11:59 pm

1 stop10h 02m

Lambert-St Louis

Sat 2/14

8:17 pm-4:19 pm

1 stop20h 02m

$197

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 2/23

8:22 pm-6:51 am

2 stops34h 29m

Lambert-St Louis

Wed 2/25

3:49 pm-11:59 pm

1 stop8h 10m

$215

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 2/12

1:57 pm-11:59 pm

1 stop10h 02m

Lambert-St Louis

Tue 2/17

3:49 pm-11:59 pm

1 stop8h 10m

$228

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 2/6

10:35 am-10:19 pm

2 stops11h 44m

Chicago Midway

Sun 2/8

6:20 am-5:03 pm

1 stop10h 43m

$244

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 2/18

2:10 pm-9:05 pm

1 stop6h 55m

Lambert-St Louis

Wed 2/25

2:45 pm-8:56 pm

1 stop6h 11m

$259

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 2/10

4:29 pm-11:37 pm

1 stop7h 08m

Lambert-St Louis

Tue 2/17

5:00 pm-12:35 am

1 stop7h 35m

$259

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 4/9

10:27 am-7:46 pm

1 stop9h 19m

Chicago O'Hare Intl

Sun 4/12

8:41 pm-9:32 am

1 stop12h 51m

$261

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

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, January is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $54). Flying from San Antonio to Illinois in July is currently the most expensive (average of $140). 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 January 21, 2026.

It’s optimal to fly from San Antonio to Illinois in the morning. By choosing this option you can save up to 40% on the cost of your flight, compared to a flight in the evening.

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 January 21, 2026.

The most flights from SAT to USIL are scheduled on a Monday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 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 January 21, 2026.
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
4,266 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

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
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

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
9,191 reviews
Southwest
8.0
Very good
4,266 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

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
11,174 reviews
Southwest
8.0
Very good
4,266 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

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
8,364 reviews
Southwest
8.0
Very good
4,266 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

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
5.7
Fair
3,057 reviews
Southwest
8.0
Very good
4,266 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

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 5h 19m. Frontier provides one of the quickest options available for as low as $279. San Antonio and Illinois are separated by a distance of 936 mi. This flight may include one or multiple stops.

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

    $61 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Spirit Airlines and United Airlines, with prices starting from $81 and $105, 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 (86%), Iberia (86%), Envoy Air( 83%).

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

    Looking at all options, your cheapest flight can be booked for $134. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $188 on average, our data indicates $874 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, January is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $54). Flying from San Antonio to Illinois in July is currently the most expensive (average of $140). 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 January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$97Average$206FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$191Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$235Average$412FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$247Average$416FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$256Average$418FlexibilityNo cancel feeOn-time63%

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