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$53+ 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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$197
(Southwest)

One-way from

$53
(Priceline)

Popular in

March

Cheapest in

August

Average price

$371

Good round-trip deal

$347 or less

Good one-way deal

$213 or less
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 ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 3, 2025.

This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/75:00 amSAT - STL
Nonstop2h 10mSouthwest
Mon 8/117:10 pmSTL - SAT
Nonstop2h 05mSouthwest
Deal found 7/2$197
This Frontier deal was found by Cheapflights users on 7/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/78:14 pmSAT - STL
1 stop12h 57mFrontier
Mon 8/117:29 pmSTL - SAT
1 stop22h 33mFrontier
Deal found 7/2$205
This Delta deal was found by Cheapflights users on 7/2. 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.
Mon 8/116:04 pmSAT - STL
1 stop5h 18mDelta
Thu 8/215:11 pmSTL - SAT
1 stop5h 17mDelta
Deal found 7/2$207
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/252:25 pmSAT - STL
1 stop4h 32mUnited Airlines
Sat 9/276:15 amSTL - SAT
1 stop4h 34mUnited Airlines
Deal found 7/2$218
This FlightHub deal was found by Cheapflights users on 7/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:10 amSAT - STL
1 stop9h 21mSpirit Airlines
Sun 8/1010:47 amSTL - SAT
1 stop21h 17mSpirit Airlines
Deal found 7/1$221
This American Airlines deal was found by Cheapflights users on 7/1. 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 7/311:25 pmSAT - STL
1 stop6h 54mAmerican Airlines
Mon 8/47:38 pmSTL - SAT
1 stop4h 20mAmerican Airlines
Deal found 7/1$228
This American Airlines deal was found by Cheapflights users on 7/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:29 pmSAT - ORD
Nonstop2h 47mAmerican Airlines
Mon 10/69:45 amORD - SAT
Nonstop2h 51mAmerican Airlines
Deal found 7/3$235
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/45:10 amSAT - MDW
Nonstop2h 40mSouthwest
Mon 8/117:45 pmMDW - SAT
Nonstop2h 40mSouthwest
Deal found 7/2$235
This Cheapflightsfares deal was found by Cheapflights users on 7/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/307:45 amSAT - ORD
1 stop12h 43mSpirit Airlines
Fri 8/17:08 amORD - SAT
1 stop11h 28mSpirit Airlines
Deal found 7/3$236
This FlightHub deal was found by Cheapflights users on 7/3. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/115:38 pmSAT - ORD
1 stop6h 44mMultiple Airlines
Sun 8/106:20 pmORD - SAT
1 stop18h 46mMultiple Airlines
Deal found 7/3$241
This FlightHub deal was found by Cheapflights users on 7/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/225:27 pmSAT - MDW
1 stop6h 00mFrontier
Mon 8/2510:58 amMDW - SAT
1 stop5h 44mFrontier
Deal found 7/1$241
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/147:05 pmSAT - ORD
1 stop5h 10mUnited Airlines
Mon 8/187:40 pmORD - SAT
Nonstop2h 58mUnited Airlines
Deal found 7/1$245

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 July 3, 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

Thu 8/7

5:00 am-7:10 am

Nonstop2h 10m

Lambert-St Louis

Mon 8/11

7:10 pm-9:15 pm

Nonstop2h 05m

$197

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 8/7

8:14 pm-9:11 am

1 stop12h 57m

Lambert-St Louis

Mon 8/11

7:29 pm-6:02 pm

1 stop22h 33m

$205

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 8/11

6:04 pm-11:22 pm

1 stop5h 18m

Lambert-St Louis

Thu 8/21

5:11 pm-10:28 pm

1 stop5h 17m

$207

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 9/25

2:25 pm-6:57 pm

1 stop4h 32m

Lambert-St Louis

Sat 9/27

6:15 am-10:49 am

1 stop4h 34m

$218

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 8/5

7:10 am-4:31 pm

1 stop9h 21m

Lambert-St Louis

Sun 8/10

10:47 am-8:04 am

1 stop21h 17m

$221

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 7/31

1:25 pm-8:19 pm

1 stop6h 54m

Lambert-St Louis

Mon 8/4

7:38 pm-11:58 pm

1 stop4h 20m

$228

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Sat 8/2

2:42 pm-5:38 pm

Nonstop2h 56m

Chicago O'Hare Intl

Tue 8/5

2:42 pm-5:38 pm

Nonstop2h 56m

$235

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Mon 8/4

5:10 am-7:50 am

Nonstop2h 40m

Chicago Midway

Mon 8/11

7:45 pm-10:25 pm

Nonstop2h 40m

$235

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 7/30

7:45 am-8:28 pm

1 stop12h 43m

Chicago O'Hare Intl

Fri 8/1

7:08 am-6:36 pm

1 stop11h 28m

$236

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 8/22

5:27 pm-11:27 pm

1 stop6h 00m

Chicago Midway

Mon 8/25

10:58 am-4:42 pm

1 stop5h 44m

$241

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 53 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, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $245). Flying from San Antonio to Illinois in March is currently the most expensive (average of $321). 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 July 3, 2025.

When flying from San Antonio to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 July 3, 2025.

The most flights from SAT to USIL are scheduled on a Thursday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 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 July 3, 2025.
Read through reviews of airlines operating flights from San Antonio to Illinois, such as Southwest, Delta, and United 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
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

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
4,270 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

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.
Delta
8.0
Very good
7,970 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

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
8,845 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

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
10,000 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

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
8,094 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

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.

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

    $53 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 $99, 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 (92%), Aer Lingus (89%), Gulf Air( 85%).

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

    Looking at all options, your cheapest flight can be booked for $142. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $156 on average our data indicates $1,234 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, August is the cheapest month in which you can book a flight from San Antonio to Illinois (average of $245). Flying from San Antonio to Illinois in March is currently the most expensive (average of $321). 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

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Top 6 airlines flying from San Antonio to Illinois

Discover the top 6 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$111Average$267FlexibilityNo cancel feeOn-time65%
FrontierCheapest$112Average$189FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$227Average$412FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$235Average$427FlexibilityNo cancel feeOn-time63%
DeltaCheapest$241Average$416FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$288Average$428FlexibilityNo cancel feeOn-time69%

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