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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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
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 6, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$127
(Priceline)

One-way from

$55
(Priceline)

Popular in

March

Cheapest in

September

Average price

$370

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. 5% potential increase in price ($19 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 6, 2025.

This Priceline deal was found by Cheapflights users on 11/4. 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.
Thu 11/202:08 pmSAT - STL
1 stop7h 01mFrontier
Sun 11/2310:24 amSTL - SAT
1 stop8h 20mFrontier
Deal found 11/4$127
This Booking.com deal was found by Cheapflights users on 11/5. 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 11/272:08 pmSAT - STL
1 stop7h 01mFrontier
Sat 12/67:43 pmSTL - SAT
1 stop13h 47mFrontier
Deal found 11/5$138
This CheapOair deal was found by Cheapflights users on 11/4. 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.
Sat 11/227:04 pmSAT - STL
1 stop28h 53mFrontier
Wed 11/267:43 pmSTL - SAT
1 stop18h 45mFrontier
Deal found 11/4$141
This CheapOair deal was found by Cheapflights users on 11/6. 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 12/57:55 pmSAT - STL
1 stop14h 19mFrontier
Sun 12/710:42 amSTL - SAT
1 stop6h 09mFrontier
Deal found 11/6$142
This CheapOair deal was found by Cheapflights users on 11/3. 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.
Sat 11/153:12 pmSAT - STL
1 stop17h 55mFrontier
Tue 11/187:45 pmSTL - SAT
1 stop23h 00mFrontier
Deal found 11/3$150
This Booking.com deal was found by Cheapflights users on 11/4. 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.
Sat 11/227:04 pmSAT - STL
1 stop14h 25mFrontier
Thu 11/277:57 pmSTL - SAT
1 stop28h 23mFrontier
Deal found 11/4$153
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/36:07 pmSAT - ORD
1 stop30h 06mMultiple Airlines
Wed 12/108:00 amORD - SAT
2 stops24h 15mMultiple Airlines
Deal found 11/5$178
This American Airlines deal was found by Cheapflights users on 11/6. 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.
Thu 12/411:53 amSAT - STL
1 stop7h 37mAmerican Airlines
Mon 12/85:30 pmSTL - SAT
1 stop4h 46mAmerican Airlines
Deal found 11/6$179
This Priceline deal was found by Cheapflights users on 11/5. 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.
Fri 12/53:10 pmSAT - ORD
1 stop6h 38mMultiple Airlines
Fri 12/126:11 amORD - SAT
1 stop10h 40mMultiple Airlines
Deal found 11/5$180
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 19mFrontier
Sun 12/214:27 pmSTL - SAT
1 stop25h 49mFrontier
Deal found 11/5$181
This Kiwi.com deal was found by Cheapflights users on 11/4. 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.
Tue 12/97:00 amSAT - ORD
1 stop23h 05mMultiple Airlines
Fri 12/126:11 amORD - SAT
1 stop10h 40mMultiple Airlines
Deal found 11/4$181
This Priceline deal was found by Cheapflights users on 11/3. 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.
Fri 12/121:55 pmSAT - ORD
1 stop10h 14mMultiple Airlines
Sun 12/146:11 amORD - SAT
1 stop10h 40mMultiple Airlines
Deal found 11/3$182

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 6, 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

Sat 11/22

7:04 pm-11:57 pm

1 stop28h 53m

Lambert-St Louis

Wed 11/26

7:43 pm-2:28 pm

1 stop18h 45m

$141

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 12/12

7:55 pm-10:14 am

1 stop14h 19m

Lambert-St Louis

Sat 12/20

7:43 pm-11:21 am

1 stop15h 38m

$183

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 12/12

7:55 pm-9:22 pm

2 stops25h 27m

Chicago Midway

Sun 12/14

6:15 am-4:51 pm

1 stop10h 36m

$201

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 1/9

10:13 am-10:02 am

1 stop23h 49m

Lambert-St Louis

Mon 1/12

7:43 pm-12:07 am

2 stops28h 24m

$232

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 11/19

7:37 pm-9:58 am

1 stop14h 21m

Lambert-St Louis

Mon 11/24

7:43 pm-10:10 am

1 stop14h 27m

$252

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sun 12/21

5:25 pm-11:50 pm

1 stop6h 25m

Lambert-St Louis

Tue 12/23

6:30 pm-1:20 am

1 stop6h 50m

$253

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 11/27

3:23 pm-10:02 am

1 stop18h 39m

Lambert-St Louis

Sun 11/30

9:54 pm-12:20 am

2 stops26h 26m

$253

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Fri 12/12

4:52 pm-10:33 pm

1 stop5h 41m

Moline Quad-City

Mon 12/15

5:08 pm-11:17 pm

1 stop6h 09m

$259

San AntonioMoline

SAT - MLI

SATMLI

San Antonio

Sat 12/13

8:00 am-4:19 pm

1 stop8h 19m

Moline Quad-City

Sun 12/14

5:08 pm-11:17 pm

1 stop6h 09m

$259

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 12/11

5:20 pm-8:17 pm

Nonstop2h 57m

Chicago O'Hare Intl

Mon 12/15

9:15 am-12:28 pm

Nonstop3h 13m

$261

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

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 $59). Flying from San Antonio to Illinois in January is currently the most expensive (average of $186). 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 6, 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 6, 2025.

The most flights from SAT to USIL are scheduled on a Thursday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 6, 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
4,240 reviews

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
9,007 reviews
Southwest
8.0
Very good
4,240 reviews

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
11,040 reviews
Southwest
8.0
Very good
4,240 reviews

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
8,123 reviews
Southwest
8.0
Very good
4,240 reviews

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
5.8
Fair
3,115 reviews
Southwest
8.0
Very good
4,240 reviews

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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 2h 57m. Frontier provides one of the quickest options available for as low as $261. San Antonio and Illinois are separated by a distance of 1042 mi. This flight may include one or multiple stops.

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

    $92 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on Frontier and Southwest, with prices starting from $100 and $114, 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 (91%), Japan Airlines (87%), Aer Lingus( 85%).

  • 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 $142 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 $59). Flying from San Antonio to Illinois in January is currently the most expensive (average of $186). 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 6, 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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