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$82+ 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 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$209
(American Airlines)

One-way from

$82
(Mytrip)

Popular in

March

Cheapest in

August

Average price

$386

Good round-trip deal

$362 or less

Good one-way deal

$219 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. 3% potential increase in price ($14 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 June 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 8/66:45 pmSAT - STL
1 stop4h 29mAmerican Airlines
Sun 8/105:15 amSTL - SAT
1 stop4h 02mAmerican Airlines
Deal found 6/10$209
This Delta deal was found by Cheapflights users on 6/12. 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 7/295:25 amSAT - STL
1 stop7h 09mDelta
Tue 7/295:23 pmSTL - SAT
1 stop6h 51mDelta
Deal found 6/12$229
This FlightHub deal was found by Cheapflights users on 6/10. 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 7/107:10 amSAT - STL
1 stop9h 21mSpirit Airlines
Thu 7/175:26 pmSTL - SAT
1 stop7h 08mSpirit Airlines
Deal found 6/10$231
This CheapOair deal was found by Cheapflights users on 6/11. 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 6/2710:57 pmSAT - ORD
1 stop7h 15mSpirit Airlines
Sun 6/297:27 amORD - SAT
1 stop6h 35mSpirit Airlines
Deal found 6/11$235
This Southwest deal was found by Cheapflights users on 6/12. 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 8/72:20 pmSAT - ORD
1 stop8h 00mSouthwest
Mon 8/115:45 pmORD - SAT
1 stop5h 10mSouthwest
Deal found 6/12$237
This Southwest deal was found by Cheapflights users on 6/10. 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 8/712:05 pmSAT - MDW
1 stop5h 30mSouthwest
Tue 8/127:05 amMDW - SAT
1 stop7h 05mSouthwest
Deal found 6/10$237
This Mytrip deal was found by Cheapflights users on 6/10. 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 7/245:38 pmSAT - RFD
2 stops25h 41mMultiple Airlines
Sun 7/279:21 amRFD - SAT
1 stop7h 12mMultiple Airlines
Deal found 6/10$240
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 8/276:30 amSAT - ORD
Nonstop2h 59mUnited Airlines
Mon 9/17:55 pmORD - SAT
Nonstop3h 05mUnited Airlines
Deal found 6/10$247
This Mytrip deal was found by Cheapflights users on 6/11. 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 7/315:38 pmSAT - PIA
1 stop20h 35mMultiple Airlines
Mon 8/412:45 pmPIA - SAT
1 stop29h 51mMultiple Airlines
Deal found 6/11$253
This FlightHub deal was found by Cheapflights users on 6/12. 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 6/246:59 pmSAT - ORD
1 stop29h 00mMultiple Airlines
Tue 7/110:43 amORD - SAT
1 stop24h 54mMultiple Airlines
Deal found 6/12$253
This Frontier deal was found by Cheapflights users on 6/11. 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 8/225:35 pmSAT - MDW
1 stop5h 52mFrontier
Mon 8/256:15 amMDW - SAT
1 stop10h 35mFrontier
Deal found 6/11$254
This FlightHub deal was found by Cheapflights users on 6/11. 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 - STL
1 stop20h 21mMultiple Airlines
Sun 7/1310:47 amSTL - SAT
1 stop21h 17mMultiple Airlines
Deal found 6/11$256

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 June 12, 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

Wed 8/6

6:45 pm-11:14 pm

1 stop4h 29m

Lambert-St Louis

Sun 8/10

5:15 am-9:17 am

1 stop4h 02m

$209

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 7/29

5:25 am-12:34 pm

1 stop7h 09m

Lambert-St Louis

Tue 7/29

5:23 pm-12:14 am

1 stop6h 51m

$229

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 7/10

7:10 am-4:31 pm

1 stop9h 21m

Lambert-St Louis

Thu 7/17

5:26 pm-12:34 am

1 stop7h 08m

$231

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Fri 6/27

10:57 pm-6:12 am

1 stop7h 15m

Chicago O'Hare Intl

Sun 6/29

7:27 am-2:02 pm

1 stop6h 35m

$235

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 8/7

2:20 pm-10:20 pm

1 stop8h 00m

Chicago O'Hare Intl

Mon 8/11

5:45 pm-10:55 pm

1 stop5h 10m

$237

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Thu 8/7

12:05 pm-5:35 pm

1 stop5h 30m

Chicago Midway

Tue 8/12

7:05 am-2:10 pm

1 stop7h 05m

$237

San AntonioChicago

SAT - RFD

SATRFD

San Antonio

Thu 7/24

5:38 pm-7:19 pm

2 stops25h 41m

Chicago Greater Rockford

Sun 7/27

9:21 am-4:33 pm

1 stop7h 12m

$240

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 8/27

6:30 am-9:29 am

Nonstop2h 59m

Chicago O'Hare Intl

Mon 9/1

7:55 pm-11:00 pm

Nonstop3h 05m

$247

San AntonioPeoria

SAT - PIA

SATPIA

San Antonio

Thu 7/31

5:38 pm-2:13 pm

1 stop20h 35m

Greater Peoria

Mon 8/4

12:45 pm-6:36 pm

1 stop29h 51m

$253

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 6/24

6:59 pm-11:59 pm

1 stop29h 00m

Chicago O'Hare Intl

Tue 7/1

10:43 am-11:37 am

1 stop24h 54m

$253

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 55 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 June 12, 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 June 12, 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 (14 on average).

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
To help decide which airline to fly from San Antonio to Illinois, see what other customers have to say about Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

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

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

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
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

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 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?

    $82 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 Southwest and American Airlines, with prices starting from $99 and $100, 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 (90%), Air Canada (85%), United Airlines( 85%).

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

    Looking at all options, your cheapest flight can be booked for $149. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $184 on average our data indicates $2,240 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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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$111Average$260FlexibilityNo cancel feeOn-time65%
FrontierCheapest$112Average$189FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$219Average$412FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$235Average$427FlexibilityNo cancel feeOn-time63%
DeltaCheapest$241Average$437FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$285Average$423FlexibilityNo cancel feeOn-time69%

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