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$67+ 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 1/6. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
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 23, 2025.

This Frontier deal was found by Cheapflights users on 12/21. 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.
Wed 12/312:09 pmSAT - ORD
1 stop10h 03mFrontier
Thu 1/810:32 pmORD - SAT
1 stop13h 17mFrontier
Deal found 12/21$233
This CheapOair deal was found by Cheapflights users on 12/22. 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.
Wed 12/316:45 amSAT - ORD
1 stop17h 27mFrontier
Thu 1/17:00 amORD - SAT
1 stop6h 14mFrontier
Deal found 12/22$234
This Orbitz deal was found by Cheapflights users on 12/21. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:45 amSAT - ORD
1 stop17h 27mFrontier
Fri 1/27:00 amORD - SAT
1 stop17h 17mFrontier
Deal found 12/21$237
This Frontier deal was found by Cheapflights users on 12/21. 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
Thu 1/86:15 amORD - SAT
1 stop9h 53mFrontier
Deal found 12/21$242
This Frontier deal was found by Cheapflights users on 12/21. 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.
Wed 12/312:09 pmSAT - ORD
1 stop10h 03mFrontier
Mon 1/59:47 amORD - SAT
1 stop8h 29mFrontier
Deal found 12/21$254
This United Airlines deal was found by Cheapflights users on 12/22. 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 12/316:40 amSAT - ORD
Nonstop2h 51mUnited Airlines
Thu 1/19:00 amORD - SAT
Nonstop3h 14mUnited Airlines
Deal found 12/22$261
This Frontier deal was found by Cheapflights users on 12/21. 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 1/59:47 amORD - SAT
1 stop8h 29mFrontier
Deal found 12/21$263
This Frontier deal was found by Cheapflights users on 12/21. 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.
Wed 12/312:09 pmSAT - ORD
1 stop10h 03mFrontier
Sun 1/116:15 amORD - SAT
1 stop9h 53mFrontier
Deal found 12/21$268
This Frontier deal was found by Cheapflights users on 12/21. 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
Sun 1/116:15 amORD - SAT
1 stop9h 53mFrontier
Deal found 12/21$277
This Delta deal was found by Cheapflights users on 12/21. 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 12/314:45 pmSAT - ORD
1 stop7h 17mDelta
Thu 1/15:31 pmORD - SAT
1 stop6h 48mDelta
Deal found 12/21$281
This Expedia deal was found by Cheapflights users on 12/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:11 pmSAT - MDW
1 stop26h 47mFrontier
Sun 1/410:50 pmMDW - SAT
1 stop12h 31mFrontier
Deal found 12/21$283
This Frontier deal was found by Cheapflights users on 12/22. 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 12/2510:18 amSAT - ORD
1 stop10h 05mFrontier
Wed 12/316:05 amORD - SAT
1 stop10h 56mFrontier
Deal found 12/22$284

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 23, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$164
(CheapOair)

One-way from

$67
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$439

Good round-trip deal

$346 or less

Good one-way deal

$173 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. 6% potential increase in price ($23 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 23, 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

Sun 2/1

8:24 pm-12:50 pm

1 stop16h 26m

Lambert-St Louis

Sat 2/28

3:49 pm-7:29 pm

1 stop27h 40m

$181

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 1/8

11:55 am-9:32 pm

1 stop9h 37m

Chicago O'Hare Intl

Sun 1/11

8:43 pm-9:40 am

1 stop12h 57m

$194

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 1/16

11:17 am-2:48 pm

1 stop27h 31m

Lambert-St Louis

Sun 1/18

10:06 am-11:52 pm

1 stop13h 46m

$220

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Fri 1/16

4:25 pm-4:52 pm

1 stop24h 27m

Chicago O'Hare Intl

Mon 1/19

6:20 am-5:23 pm

1 stop11h 03m

$222

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 1/7

3:55 pm-2:48 pm

2 stops22h 53m

Lambert-St Louis

Sat 1/17

3:43 pm-9:30 am

1 stop17h 47m

$227

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 1/16

11:17 am-2:48 pm

1 stop27h 31m

Lambert-St Louis

Mon 1/19

8:32 pm-11:52 pm

2 stops27h 20m

$236

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Sat 1/17

6:00 am-8:35 am

Nonstop2h 35m

Chicago Midway

Sun 1/18

6:15 am-12:10 pm

1 stop5h 55m

$248

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 3/5

8:25 pm-9:49 am

1 stop13h 24m

Lambert-St Louis

Sun 3/8

4:51 pm-8:08 pm

1 stop27h 17m

$251

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 1/13

6:30 am-11:47 am

3 stops29h 17m

Chicago O'Hare Intl

Sat 1/17

5:15 am-11:52 pm

2 stops18h 37m

$265

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Sun 1/18

7:00 am-9:51 am

Nonstop2h 51m

Chicago O'Hare Intl

Wed 1/21

9:04 am-12:24 pm

Nonstop3h 20m

$269

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/20

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 $61). 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 23, 2025.

It’s optimal to fly from San Antonio to Illinois in the morning. By choosing this option you can save up to 25% 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 23, 2025.

The most flights from SAT to USIL are scheduled on a Monday (24 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (7 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 23, 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
4,253 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

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
4,253 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

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
9,105 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

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
11,054 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

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
8,196 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

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.
Frontier
5.8
Fair
3,075 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

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.

  • How long is the flight from San Antonio to Illinois?

    A quick flight from San Antonio to Illinois can take about 2h 35m. Frontier provides one of the quickest options available for as low as $248. San Antonio and Illinois are separated by a distance of 1036 mi. This flight may include one or multiple stops.

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

    $61 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 United Airlines, with prices starting from $81 and $105, 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: Iberia (81%), Royal Jordanian (81%), Aer Lingus( 81%).

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

    Looking at all options, your cheapest flight can be booked for $103. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $123 on average, our data indicates $1,305 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 $61). 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 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$97Average$214FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$208Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$235Average$410FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$247Average$423FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$256Average$424FlexibilityNo cancel feeOn-time63%

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