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$55+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Dec 16 — Dec 231
Tue 12/16
Tue 12/23
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 16, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$124
(CheapOair)

One-way from

$55
(Mytrip)

Popular in

December

Cheapest in

September

Average price

$402

Good round-trip deal

$356 or less

Good one-way deal

$189 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. 8% potential increase in price ($36 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 16, 2025.

This CheapOair deal was found by Cheapflights users on 11/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:10 amSAT - STL
1 stop13h 23mFrontier
Sun 12/1410:42 amSTL - SAT
1 stop6h 09mFrontier
Deal found 11/15$124
This CheapOair deal was found by Cheapflights users on 11/16. 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.
Fri 12/127:55 pmSAT - STL
1 stop14h 19mFrontier
Sun 12/1410:42 amSTL - SAT
1 stop6h 09mFrontier
Deal found 11/16$138
This Expedia deal was found by Cheapflights users on 11/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/57:55 pmSAT - STL
1 stop14h 19mFrontier
Sun 12/710:42 amSTL - SAT
1 stop6h 09mFrontier
Deal found 11/15$146
This CheapOair deal was found by Cheapflights users on 11/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:10 amSAT - STL
1 stop13h 23mFrontier
Fri 12/510:42 amSTL - SAT
1 stop6h 09mFrontier
Deal found 11/15$181
This Kiwi.com deal was found by Cheapflights users on 11/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/812:03 pmSAT - STL
2 stops46h 11mFrontier
Sun 12/1410:42 amSTL - SAT
1 stop6h 09mFrontier
Deal found 11/14$198
This Kiwi.com deal was found by Cheapflights users on 11/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/127:55 pmSAT - STL
1 stop14h 19mMultiple Airlines
Sun 12/1410:42 amSTL - SAT
2 stops36h 44mMultiple Airlines
Deal found 11/16$202
This Kiwi.com deal was found by Cheapflights users on 11/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/177:00 amSAT - ORD
1 stop23h 05mMultiple Airlines
Wed 12/246:05 amORD - SAT
1 stop10h 56mMultiple Airlines
Deal found 11/15$222
This Kiwi.com deal was found by Cheapflights users on 11/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/155:40 amSAT - ORD
1 stop24h 25mMultiple Airlines
Thu 12/1812:39 pmORD - SAT
1 stop28h 22mMultiple Airlines
Deal found 11/13$223
This Kiwi.com deal was found by Cheapflights users on 11/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/295:56 pmSAT - STL
1 stop15h 44mFrontier
Mon 1/58:52 pmSTL - SAT
1 stop19h 23mFrontier
Deal found 11/13$224
This Kiwi.com deal was found by Cheapflights users on 11/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/83:10 pmSAT - STL
1 stop7h 23mMultiple Airlines
Sun 12/1410:42 amSTL - SAT
1 stop6h 09mMultiple Airlines
Deal found 11/14$225
This Kiwi.com deal was found by Cheapflights users on 11/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/177:00 amSAT - ORD
1 stop23h 05mSpirit Airlines
Wed 12/313:26 pmORD - SAT
1 stop8h 00mSpirit Airlines
Deal found 11/16$225
This Kiwi.com deal was found by Cheapflights users on 11/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:39 pmSAT - ORD
1 stop9h 51mMultiple Airlines
Wed 12/313:51 pmORD - SAT
2 stops17h 32mMultiple Airlines
Deal found 11/16$226

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 16, 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 12/12

7:55 pm-10:14 am

1 stop14h 19m

Lambert-St Louis

Sun 12/14

10:42 am-4:51 pm

1 stop6h 09m

$138

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 12/12

7:55 pm-10:14 am

1 stop14h 19m

Lambert-St Louis

Sun 12/14

10:42 am-11:26 pm

2 stops36h 44m

$202

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Mon 1/5

12:45 pm-2:21 pm

1 stop25h 36m

Chicago O'Hare Intl

Thu 1/8

10:32 pm-11:00 am

1 stop12h 28m

$226

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 12/2

6:07 pm-6:25 am

1 stop12h 18m

Chicago O'Hare Intl

Thu 12/4

3:47 pm-8:30 pm

2 stops28h 43m

$244

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 12/29

7:11 pm-10:33 pm

1 stop27h 22m

Lambert-St Louis

Fri 1/2

7:43 pm-12:36 pm

1 stop16h 53m

$252

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 3/3

6:00 am-7:45 pm

1 stop13h 45m

Chicago O'Hare Intl

Wed 3/4

10:27 am-11:53 pm

1 stop13h 26m

$257

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Fri 12/12

5:00 am-10:34 am

1 stop5h 34m

Moline Quad-City

Mon 12/15

6:00 am-1:08 pm

1 stop7h 08m

$259

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Sat 12/13

3:30 pm-10:33 pm

1 stop7h 03m

Moline Quad-City

Sun 12/14

5:08 pm-12:34 am

1 stop7h 26m

$259

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 12/11

5:40 am-8:09 pm

2 stops14h 29m

Chicago O'Hare Intl

Sun 12/14

1:52 pm-1:00 pm

2 stops23h 08m

$262

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 12/25

10:18 am-8:23 pm

1 stop10h 05m

Chicago O'Hare Intl

Mon 12/29

6:00 am-5:01 pm

1 stop11h 01m

$263

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/15

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, 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 16, 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.

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 November 16, 2025.

The most flights from SAT to USIL are scheduled on a Friday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 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 November 16, 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
4,244 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
9,015 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
11,050 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
8,143 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
3,106 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

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 34m. 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?

    $68 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on American Airlines and United Airlines, with prices starting from $107 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 $138. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $149 on average, our data indicates $951 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 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$97Average$206FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$208Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$235Average$388FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$247Average$410FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$256Average$426FlexibilityNo cancel feeOn-time63%

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