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$57+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Dec 30 — Jan 61
Tue 12/30
Tue 1/6
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 November 30, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$152
(Kiwi.com)

One-way from

$57
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$407

Good round-trip deal

$373 or less

Good one-way deal

$248 or less
Provider with most accurate pricing for San Antonio-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for San Antonio-Chicago (CHI) flights.
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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. 4% potential increase in price ($16 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 November 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 November 30, 2025.

This Expedia deal was found by Cheapflights users on 11/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/197:37 pmSAT - STL
1 stop26h 56mFrontier
Mon 12/228:52 pmSTL - SAT
1 stop12h 31mFrontier
Deal found 11/28$187
This Frontier deal was found by Cheapflights users on 11/29. 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.
Tue 12/3012:18 pmSAT - ORD
1 stop11h 54mFrontier
Sat 1/39:55 pmORD - SAT
1 stop11h 28mFrontier
Deal found 11/29$217
This CheapOair deal was found by Cheapflights users on 11/28. 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.
Tue 12/2312:18 pmSAT - ORD
1 stop11h 54mFrontier
Wed 1/75:29 pmORD - SAT
1 stop24h 49mFrontier
Deal found 11/28$218
This Kiwi.com deal was found by Cheapflights users on 11/29. 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 12/312:09 pmSAT - ORD
1 stop10h 03mFrontier
Sun 1/410:49 pmORD - SAT
2 stops40h 11mFrontier
Deal found 11/29$224
This American Airlines deal was found by Cheapflights users on 11/30. 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.
Wed 12/2410:35 amSAT - STL
1 stop8h 47mAmerican Airlines
Thu 1/19:36 amSTL - SAT
1 stop9h 44mAmerican Airlines
Deal found 11/30$225
This Mytrip deal was found by Cheapflights users on 11/28. 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.
Mon 12/1512:03 pmSAT - ORD
1 stop8h 14mFrontier
Thu 12/183:27 pmORD - SAT
1 stop21h 49mFrontier
Deal found 11/28$228
This Frontier deal was found by Cheapflights users on 11/28. 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.
Thu 12/119:10 amSAT - MDW
1 stop12h 48mFrontier
Fri 12/1212:18 pmMDW - SAT
1 stop6h 42mFrontier
Deal found 11/28$228
This CheapOair deal was found by Cheapflights users on 11/29. 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 12/119:10 amSAT - ORD
1 stop28h 06mFrontier
Mon 12/157:00 amORD - SAT
1 stop11h 58mFrontier
Deal found 11/29$229
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/123:10 pmSAT - ORD
2 stops20h 44mMultiple Airlines
Mon 1/1212:44 pmORD - SAT
1 stop11h 08mMultiple Airlines
Deal found 11/28$231
This CheapOair deal was found by Cheapflights users on 11/29. 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.
Sun 12/141:51 pmSAT - ORD
1 stop21h 51mFrontier
Thu 12/187:00 amORD - SAT
1 stop17h 17mFrontier
Deal found 11/29$233
This Booking.com deal was found by Cheapflights users on 11/28. 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.
Thu 12/1810:18 amSAT - ORD
1 stop10h 05mFrontier
Mon 12/227:00 amORD - SAT
1 stop17h 17mFrontier
Deal found 11/28$235
This Kiwi.com deal was found by Cheapflights users on 11/28. 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 12/57:55 pmSAT - STL
1 stop14h 19mMultiple Airlines
Mon 12/81:16 pmSTL - SAT
1 stop27h 49mMultiple Airlines
Deal found 11/28$236

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 November 30, 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

Fri 12/19

7:37 pm-10:33 pm

1 stop26h 56m

Lambert-St Louis

Mon 12/22

8:52 pm-9:23 am

1 stop12h 31m

$187

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

7:14 pm-7:50 am

1 stop12h 36m

Lambert-St Louis

Sun 1/11

9:35 am-6:18 pm

1 stop8h 43m

$197

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 1/23

8:24 pm-2:46 pm

1 stop18h 22m

Lambert-St Louis

Mon 1/26

1:40 pm-7:33 pm

1 stop5h 53m

$197

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 2/6

6:13 pm-8:43 am

1 stop14h 30m

Chicago Midway

Sun 2/8

6:20 am-5:03 pm

1 stop10h 43m

$218

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

$227

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 12/5

7:55 pm-10:14 am

1 stop14h 19m

Lambert-St Louis

Mon 12/8

1:16 pm-5:05 pm

1 stop27h 49m

$236

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/1

6:44 am-5:10 pm

1 stop10h 26m

Lambert-St Louis

Mon 1/5

5:16 am-9:45 am

1 stop4h 29m

$252

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 2/27

3:02 pm-5:11 pm

1 stop26h 09m

Chicago Midway

Sun 3/1

8:56 pm-2:07 pm

1 stop17h 11m

$253

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Sun 12/28

10:18 am-11:21 pm

1 stop13h 03m

Chicago Midway

Wed 12/31

8:15 am-5:01 pm

1 stop8h 46m

$258

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Tue 1/27

4:29 pm-10:33 pm

1 stop6h 04m

Moline Quad-City

Sat 1/31

5:20 pm-12:38 am

1 stop7h 18m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/28

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, March is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $58). Flying from San Antonio to Illinois in February is currently the most expensive (average of $160). 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 November 30, 2025.

It’s optimal to fly from San Antonio to Illinois in the evening. By choosing this option you can save up to 49% on the cost of your flight, compared to a flight in the afternoon.

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 November 30, 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
4,252 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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
4,252 reviews
Southwest
8.0
Very good
4,252 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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
9,056 reviews
Southwest
8.0
Very good
4,252 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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
11,039 reviews
Southwest
8.0
Very good
4,252 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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
8,156 reviews
Southwest
8.0
Very good
4,252 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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
3,098 reviews
Southwest
8.0
Very good
4,252 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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 6h 04m. 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 cheapest airlines to fly from San Antonio to Illinois one-way?

    $57 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 Southwest, with prices starting from $87 and $139, 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 (88%), Royal Jordanian (87%), Japan Airlines( 87%).

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

    Looking at all options, your cheapest flight can be booked for $151. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $162 on average, our data indicates $1,380 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, March is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $58). Flying from San Antonio to Illinois in February is currently the most expensive (average of $160). 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 November 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$97Average$216FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$208Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$235Average$414FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$247Average$404FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$256Average$425FlexibilityNo cancel feeOn-time63%

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