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$99+ Cheap flights from Illinois to San Antonio (SAT)

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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAT
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
1 adult, Economy
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Cheap flight deals from Illinois to San Antonio

Keep the following information in mind while searching for Illinois to San Antonio flight deals. Data was last updated June 18, 2025.

Round-trip from

$185
(Cheapflightsfares)

One-way from

$99
(United Airlines)

Popular in

March

Cheapest in

September

Average price

$420

Good round-trip deal

$297 or less

Good one-way deal

$188 or less
From Illinois to San Antonio
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One-way flight from Illinois to San Antonio
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Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Illinois to San Antonio.
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Price to beat on a one-way flight from Illinois to San Antonio.
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Find flight deals from Illinois to San Antonio

Cheapest flights from Illinois to San Antonio
Explore the most affordable flight options available from Illinois to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/153:21 pmORD - SAT
1 stop13h 43mSpirit Airlines
Wed 9/176:00 amSAT - ORD
1 stop8h 16mSpirit Airlines
Deal found 6/16$185
This FlightHub deal was found by Cheapflights users on 6/17. 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.
Thu 7/35:40 amORD - SAT
1 stop13h 34mMultiple Airlines
Mon 7/710:57 pmSAT - ORD
1 stop7h 15mMultiple Airlines
Deal found 6/17$197
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/77:10 pmSTL - SAT
Nonstop2h 05mSouthwest
Mon 8/114:30 pmSAT - STL
Nonstop2h 10mSouthwest
Deal found 6/16$197
This Frontier deal was found by Cheapflights users on 6/17. 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.
Fri 6/205:01 amORD - SAT
1 stop11h 42mFrontier
Mon 6/235:38 pmSAT - ORD
1 stop6h 36mFrontier
Deal found 6/17$200
This Priceline deal was found by Cheapflights users on 6/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/206:20 amMDW - SAT
1 stop10h 23mFrontier
Mon 6/308:50 amSAT - MDW
1 stop11h 27mFrontier
Deal found 6/16$200
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/256:15 amSTL - SAT
1 stop4h 22mUnited Airlines
Thu 8/282:25 pmSAT - STL
1 stop4h 33mUnited Airlines
Deal found 6/16$202
This Delta deal was found by Cheapflights users on 6/17. 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.
Wed 8/139:17 amSTL - SAT
1 stop5h 14mDelta
Thu 8/216:11 pmSAT - STL
1 stop5h 03mDelta
Deal found 6/17$207
This Booking.com deal was found by Cheapflights users on 6/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/257:29 pmSTL - SAT
1 stop23h 45mFrontier
Sun 6/298:12 pmSAT - STL
1 stop13h 00mFrontier
Deal found 6/16$210
This FlightHub deal was found by Cheapflights users on 6/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/911:24 amSTL - SAT
1 stop7h 58mMultiple Airlines
Thu 7/108:14 pmSAT - STL
1 stop12h 57mMultiple Airlines
Deal found 6/15$218
This American Airlines deal was found by Cheapflights users on 6/18. 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.
Tue 7/156:00 amSTL - SAT
1 stop6h 35mAmerican Airlines
Tue 7/225:00 amSAT - STL
1 stop4h 18mAmerican Airlines
Deal found 6/18$229
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/147:40 pmORD - SAT
Nonstop2h 58mUnited Airlines
Mon 8/186:45 amSAT - ORD
Nonstop2h 59mUnited Airlines
Deal found 6/16$257
This Southwest deal was found by Cheapflights users on 6/17. 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 8/77:40 amMDW - SAT
Nonstop2h 40mSouthwest
Mon 8/112:50 pmSAT - MDW
Nonstop2h 35mSouthwest
Deal found 6/17$257

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois to San Antonio 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 June 18, 2025.
Use the filters below to find and compare flights from Illinois to San Antonio that are best for you.

Fly from

Illinois

Fly to

San Antonio

Route

Depart

Return

Price

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Mon 9/15

3:21 pm-5:04 am

1 stop13h 43m

San Antonio

Wed 9/17

6:00 am-2:16 pm

1 stop8h 16m

$185

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Thu 7/3

5:40 am-7:14 pm

1 stop13h 34m

San Antonio

Mon 7/7

10:57 pm-6:12 am

1 stop7h 15m

$197

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 8/7

7:10 pm-9:15 pm

Nonstop2h 05m

San Antonio

Mon 8/11

4:30 pm-6:40 pm

Nonstop2h 10m

$197

ChicagoSan Antonio

ORD - SAT

ORDSAT

Chicago O'Hare Intl

Fri 7/4

5:01 am-4:43 pm

1 stop11h 42m

San Antonio

Mon 7/7

5:38 pm-12:22 am

1 stop6h 44m

$200

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 8/25

6:15 am-10:37 am

1 stop4h 22m

San Antonio

Thu 8/28

2:25 pm-6:58 pm

1 stop4h 33m

$202

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 8/13

9:17 am-2:31 pm

1 stop5h 14m

San Antonio

Thu 8/21

6:11 pm-11:14 pm

1 stop5h 03m

$207

ChicagoSan Antonio

MDW - SAT

MDWSAT

Chicago Midway

Thu 7/10

9:12 pm-9:30 am

1 stop12h 18m

San Antonio

Sun 7/13

8:14 pm-11:41 am

1 stop15h 27m

$210

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 6/25

7:29 pm-7:14 pm

1 stop23h 45m

San Antonio

Sun 6/29

8:12 pm-9:12 am

1 stop13h 00m

$210

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 7/9

11:24 am-7:22 pm

1 stop7h 58m

San Antonio

Thu 7/10

8:14 pm-9:11 am

1 stop12h 57m

$218

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 7/15

5:30 am-9:13 am

1 stop3h 43m

San Antonio

Wed 7/23

6:28 pm-11:51 pm

1 stop5h 23m

$229

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 53 results
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Best time to book a flight from Illinois to San Antonio

Have a flexible travel schedule? Discover the best time to fly to San Antonio from Illinois 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 Illinois to San Antonio

What is the cheapest month to book a flight from Illinois to San Antonio?

Currently, August is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $295). Flying from Illinois to San Antonio in March is currently the most expensive (average of $376). 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 IL to SAT?

Find hourly flight availability from Illinois to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 18, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to San Antonio as you normally would.

Weekly flight availability from Illinois to San Antonio

Explore weekly flight availability from Illinois to San Antonio. 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 June 18, 2025.

The most flights from USIL to SAT are scheduled on a Monday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 on average).

Rainfall in San Antonio by month

Plan your trip to San Antonio by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Antonio ranges from 1.6 - 3.7 inches per month. May is typically the wettest month, when rainfall can reach 3.7 in. December is typically the driest time to visit San Antonio when rainfall is around 1.6 in.

Temperature in San Antonio by month

Plan your trip to San Antonio by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Antonio, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing San Antonio

Get insights into the airlines that provide service to San Antonio. 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 San Antonio. Reviews last updated June 18, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Illinois to San Antonio. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,280 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,810 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Illinois to San Antonio. 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 into for flights to San Antonio from Illinois?

    Most people fly into San Antonio (SAT) if they book a flight to San Antonio from Illinois. San Antonio is conveniently located just 7.6 mi from San Antonio’s city center.

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

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $99. Users have also found prices from $100 and $104 on American Airlines and Delta, respectively.

  • What are the most popular routes from Illinois to San Antonio?

    Most travelers choose Chicago O'Hare Intl - San Antonio, Chicago Midway - San Antonio or Lambert-St Louis - San Antonio when deciding on the best route from Illinois to San Antonio.

  • What are the most reliable airlines from Illinois to San Antonio?

    Before booking your flight to San Antonio from Illinois, check out the most reliable airlines to get you to your destination on time: United Airlines (83%), Air Canada (79%), SkyWest Airlines( 76%).

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

    While on average a flight from Illinois to San Antonio is generally $430, our data shows the cheapest flight currently is $148. When looking at the most popular route, (Chicago O'Hare Intl - San Antonio), you can expect to pay $185 for that flight.

  • Can I find deals for flights from Illinois to San Antonio that include hotel bookings?

    Yes. In addition to deals on Illinois to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to San Antonio?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to San Antonio.

  • Can I find deals for business class flights from Illinois to San Antonio?

    Yes. Cheapflights offers flight deals from Illinois to San Antonio 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 Illinois to San Antonio?

    Currently, August is the cheapest month in which you can book a flight from Illinois to San Antonio (average of $295). Flying from Illinois to San Antonio in March is currently the most expensive (average of $376). 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

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
New Braunfels

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Alternative routes for Illinois to San Antonio

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Illinois to San Antonio

Discover the top 6 airlines that operate flights from Illinois to San Antonio. 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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$125Average$217FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$132Average$259FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$193Average$403FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$232Average$502FlexibilityNo cancel feeOn-time63%
DeltaCheapest$258Average$348FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$258Average$441FlexibilityNo cancel feeOn-time69%

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