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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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
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 December 4, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/4. 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.
Thu 12/2511:30 amSAT - ORD
1 stop7h 09mSpirit Airlines
Wed 12/313:26 pmORD - SAT
1 stop8h 00mSpirit Airlines
Deal found 12/4$189
This Mytrip deal was found by Cheapflights users on 12/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1810:18 amSAT - ORD
1 stop10h 05mMultiple Airlines
Thu 1/88:43 pmORD - SAT
1 stop12h 57mMultiple Airlines
Deal found 12/3$200
This CheapOair deal was found by Cheapflights users on 12/3. 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.
Mon 12/227:11 pmSAT - ORD
1 stop13h 51mFrontier
Tue 12/307:01 pmORD - SAT
1 stop23h 15mFrontier
Deal found 12/3$204
This CheapOair deal was found by Cheapflights users on 12/3. 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.
Mon 12/227:11 pmSAT - STL
1 stop27h 22mFrontier
Wed 1/75:11 pmSTL - SAT
1 stop25h 07mFrontier
Deal found 12/3$205
This CheapOair deal was found by Cheapflights users on 12/3. 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.
Thu 12/1810:18 amSAT - ORD
1 stop10h 05mFrontier
Thu 1/810:32 pmORD - SAT
1 stop13h 17mFrontier
Deal found 12/3$208
This CheapOair deal was found by Cheapflights users on 12/3. 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.
Thu 12/182:09 pmSAT - STL
1 stop19h 53mFrontier
Mon 12/228:52 pmSTL - SAT
1 stop12h 31mFrontier
Deal found 12/3$214
This Delta deal was found by Cheapflights users on 12/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:10 amSAT - STL
1 stop7h 11mDelta
Wed 1/79:59 amSTL - SAT
1 stop5h 22mDelta
Deal found 12/2$218
This Kiwi.com deal was found by Cheapflights users on 12/4. 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.
Thu 12/2511:30 amSAT - ORD
1 stop7h 09mMultiple Airlines
Mon 1/51:32 pmORD - SAT
1 stop26h 43mMultiple Airlines
Deal found 12/4$218
This Cheapflightsfares deal was found by Cheapflights users on 12/2. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:39 pmSAT - ORD
1 stop9h 51mSpirit Airlines
Thu 1/13:26 pmORD - SAT
1 stop8h 00mSpirit Airlines
Deal found 12/2$220
This Frontier deal was found by Cheapflights users on 12/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:11 pmSAT - ORD
1 stop13h 51mFrontier
Mon 1/56:00 amORD - SAT
1 stop11h 01mFrontier
Deal found 12/4$224
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/117:56 pmSAT - MDW
1 stop15h 12mFrontier
Mon 12/1512:18 pmMDW - SAT
1 stop6h 40mFrontier
Deal found 12/2$225
This Delta deal was found by Cheapflights users on 12/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:10 amSAT - STL
1 stop7h 11mDelta
Thu 1/812:00 pmSTL - SAT
1 stop5h 15mDelta
Deal found 12/2$227

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 December 4, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$129
(CheapOair)

One-way from

$57
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$440

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.
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. 4% potential increase in price ($16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 4, 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 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

$129

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 2/4

2:42 pm-9:43 pm

1 stop7h 01m

Chicago O'Hare Intl

Sun 2/8

1:58 pm-10:55 pm

1 stop8h 57m

$199

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Sat 1/10

5:20 am-10:32 am

1 stop5h 12m

Chicago Midway

Sun 1/11

1:49 pm-9:34 pm

1 stop7h 45m

$199

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 1/9

4:29 pm-10:07 pm

1 stop5h 38m

Chicago Midway

Sun 1/11

1:49 pm-9:34 pm

1 stop7h 45m

$201

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Sun 3/1

5:25 am-12:46 pm

1 stop7h 21m

Chicago Midway

Sun 3/1

6:40 pm-12:34 am

1 stop5h 54m

$201

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

5:03 pm-10:02 am

2 stops16h 59m

Lambert-St Louis

Sun 1/11

9:35 am-11:52 pm

1 stop14h 17m

$209

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/18

2:09 pm-10:02 am

1 stop19h 53m

Lambert-St Louis

Mon 12/22

8:52 pm-9:23 am

1 stop12h 31m

$214

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 12/31

4:45 pm-11:38 pm

1 stop6h 53m

Lambert-St Louis

Tue 1/6

3:40 pm-9:34 pm

1 stop5h 54m

$218

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Tue 2/3

8:20 am-4:35 pm

2 stops8h 15m

Chicago Midway

Sat 2/7

9:45 am-8:10 pm

2 stops10h 25m

$223

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 1/19

6:30 am-2:38 pm

1 stop8h 08m

Lambert-St Louis

Fri 1/23

6:57 pm-12:38 am

1 stop5h 41m

$223

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

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 December 4, 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 December 4, 2025.

The most flights from SAT to USIL are scheduled on a Thursday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 December 4, 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
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

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
4,250 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

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
9,066 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

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
11,047 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

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
8,157 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

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
3,090 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

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 7h 01m. Frontier provides one of the quickest options available for as low as $199. 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?

    $73 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 $81 and $127, 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 (100%), Royal Jordanian (86%), Qatar Airways( 86%).

  • 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 $145 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 December 4, 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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