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$68+ 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
Feb 3 — Feb 101
Tue 2/3
Tue 2/10
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 January 4, 2026.

This CheapOair deal was found by Cheapflights users on 1/3. 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 2/121:57 pmSAT - STL
1 stop10h 02mFrontier
Thu 2/1910:11 pmSTL - SAT
1 stop23h 42mFrontier
Deal found 1/3$161
This Kiwi.com deal was found by Cheapflights users on 1/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/105:12 pmSAT - STL
1 stop20h 46mMultiple Airlines
Tue 2/173:49 pmSTL - SAT
1 stop8h 10mMultiple Airlines
Deal found 1/2$181
This Kiwi.com deal was found by Cheapflights users on 1/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/121:57 pmSAT - STL
1 stop10h 02mFrontier
Mon 2/161:54 pmSTL - SAT
1 stop26h 47mFrontier
Deal found 1/3$204
This Kiwi.com deal was found by Cheapflights users on 1/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/308:24 pmSAT - ORD
2 stops42h 59mMultiple Airlines
Fri 2/68:43 pmORD - SAT
1 stop12h 47mMultiple Airlines
Deal found 1/2$210
This Kiwi.com deal was found by Cheapflights users on 1/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/306:30 amSAT - MDW
1 stop13h 22mMultiple Airlines
Sun 2/11:00 pmMDW - SAT
1 stop10h 52mMultiple Airlines
Deal found 1/1$210
This Cheapflightsfares deal was found by Cheapflights users on 1/2. 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 2/1810:26 amSAT - ORD
1 stop13h 21mSpirit Airlines
Sun 2/2210:44 amORD - SAT
1 stop13h 15mSpirit Airlines
Deal found 1/2$213
This Kiwi.com deal was found by Cheapflights users on 1/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/121:57 pmSAT - STL
1 stop10h 02mMultiple Airlines
Mon 2/163:49 pmSTL - SAT
2 stops41h 41mMultiple Airlines
Deal found 1/3$215
This Kiwi.com deal was found by Cheapflights users on 1/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/201:57 pmSAT - ORD
2 stops21h 25mMultiple Airlines
Sun 2/223:40 pmORD - SAT
1 stop17h 50mMultiple Airlines
Deal found 1/2$215
This Mytrip deal was found by Cheapflights users on 1/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/222:06 pmSAT - ORD
1 stop30h 23mMultiple Airlines
Sun 1/258:43 pmORD - SAT
1 stop12h 57mMultiple Airlines
Deal found 1/2$216
This Kiwi.com deal was found by Cheapflights users on 1/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/116:30 amSAT - ORD
1 stop9h 22mMultiple Airlines
Mon 2/169:41 pmORD - SAT
1 stop26h 18mMultiple Airlines
Deal found 1/1$217
This Kiwi.com deal was found by Cheapflights users on 1/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/216:00 amSAT - MDW
1 stop8h 55mMultiple Airlines
Mon 2/239:22 pmMDW - SAT
1 stop26h 37mMultiple Airlines
Deal found 1/2$217
This Mytrip deal was found by Cheapflights users on 1/3. 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.
Fri 1/306:30 amSAT - ORD
2 stops26h 42mSpirit Airlines
Sat 1/3112:44 pmORD - SAT
1 stop11h 08mSpirit Airlines
Deal found 1/3$220

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 January 4, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$161
(CheapOair)

One-way from

$68
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$389

Good round-trip deal

$333 or less

Good one-way deal

$188 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. 3% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 4, 2026.
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 2/12

1:57 pm-11:59 pm

1 stop10h 02m

Lambert-St Louis

Thu 2/19

10:11 pm-9:53 pm

1 stop23h 42m

$161

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 2/10

5:12 pm-1:58 pm

1 stop20h 46m

Lambert-St Louis

Tue 2/17

3:49 pm-11:59 pm

1 stop8h 10m

$181

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 2/12

1:57 pm-11:59 pm

1 stop10h 02m

Lambert-St Louis

Mon 2/16

1:54 pm-4:41 pm

1 stop26h 47m

$204

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 2/17

6:00 am-7:47 pm

1 stop13h 47m

Chicago O'Hare Intl

Sat 2/21

12:44 pm-11:59 pm

1 stop11h 15m

$210

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 1/22

2:06 pm-8:29 pm

1 stop30h 23m

Chicago O'Hare Intl

Sun 1/25

8:43 pm-9:40 am

1 stop12h 57m

$216

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 2/5

10:35 am-10:36 pm

1 stop12h 01m

Chicago O'Hare Intl

Sun 2/8

5:40 am-7:29 pm

2 stops13h 49m

$220

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 2/12

8:25 pm-11:58 am

1 stop15h 33m

Chicago O'Hare Intl

Sat 2/14

4:42 pm-4:19 pm

1 stop23h 37m

$225

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 1/30

6:30 am-7:52 pm

1 stop13h 22m

Chicago Midway

Mon 2/2

6:20 am-7:33 pm

2 stops13h 13m

$226

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 1/29

6:30 am-5:52 pm

1 stop11h 22m

Chicago O'Hare Intl

Tue 2/3

5:53 pm-9:30 am

2 stops39h 37m

$230

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Wed 2/18

6:12 pm-9:12 pm

2 stops27h 00m

Chicago Midway

Mon 2/23

9:22 pm-11:59 pm

1 stop26h 37m

$236

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/3

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, January 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 April is currently the most expensive (average of $148). 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 January 4, 2026.

It’s optimal to fly from San Antonio to Illinois in the morning. By choosing this option you can save up to 40% on the cost of your flight, compared to a flight in the evening.

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 January 4, 2026.
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

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

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

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

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
9,138 reviews
Southwest
8.0
Very good
4,253 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

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
11,077 reviews
Southwest
8.0
Very good
4,253 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

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
8,264 reviews
Southwest
8.0
Very good
4,253 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

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
5.7
Fair
3,063 reviews
Southwest
8.0
Very good
4,253 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

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 $253. 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 (85%), Emirates (81%), Japan Airlines( 80%).

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

    Looking at all options, your cheapest flight can be booked for $134. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $166 on average, our data indicates $1,386 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, January 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 April is currently the most expensive (average of $148). 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 January 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$97Average$214FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$191Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$235Average$411FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$247Average$420FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$256Average$422FlexibilityNo cancel feeOn-time63%

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