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$77+ 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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
nov. 15 — nov. 221
sáb. 11/15
sáb. 11/22
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 octubre 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(CheapOair)

One-way from

$77
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$362

Good round-trip deal

$317 or less

Good one-way deal

$220 or less
Provider with most accurate pricing for San Antonio-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for San Antonio-Chicago (CHI) flights.
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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 ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in October 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 octubre 16, 2025.

This CheapOair deal was found by Cheapflights users on 10/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/178:25 pmSAT - STL
1 stop12h 42mFrontier
mar. 11/187:45 pmSTL - SAT
1 stop23h 00mFrontier
Deal found 10/15$160
This Priceline deal was found by Cheapflights users on 10/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/83:12 pmSAT - ORD
1 stop8h 17mFrontier
sáb. 11/157:15 amORD - SAT
1 stop7h 02mFrontier
Deal found 10/15$160
This Mytrip deal was found by Cheapflights users on 10/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/47:37 pmSAT - ORD
1 stop14h 10mSpirit Airlines
mar. 11/1110:52 amORD - SAT
1 stop7h 40mSpirit Airlines
Deal found 10/15$166
This Kiwi.com deal was found by Cheapflights users on 10/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/126:45 amSAT - ORD
2 stops18h 14mMultiple Airlines
dom. 11/163:30 pmORD - SAT
1 stop17h 44mMultiple Airlines
Deal found 10/15$170
This Kiwi.com deal was found by Cheapflights users on 10/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/13:12 pmSAT - ORD
1 stop8h 17mMultiple Airlines
sáb. 11/86:30 amORD - SAT
1 stop17h 15mMultiple Airlines
Deal found 10/15$178
This Frontier deal was found by Cheapflights users on 10/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/72:09 pmSAT - ORD
1 stop7h 39mFrontier
lun. 11/105:05 amORD - SAT
1 stop11h 35mFrontier
Deal found 10/15$179
This Kiwi.com deal was found by Cheapflights users on 10/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/710:04 amSAT - MDW
1 stop27h 53mFrontier
dom. 11/96:06 pmMDW - SAT
2 stops22h 34mFrontier
Deal found 10/16$180
This Booking.com deal was found by Cheapflights users on 10/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/308:43 pmSAT - MDW
1 stop14h 47mFrontier
lun. 11/312:30 pmMDW - SAT
1 stop7h 00mFrontier
Deal found 10/15$181
This Kiwi.com deal was found by Cheapflights users on 10/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/3111:04 amSAT - ORD
1 stop14h 11mMultiple Airlines
dom. 11/210:43 pmORD - SAT
2 stops25h 02mMultiple Airlines
Deal found 10/16$182
This Kiwi.com deal was found by Cheapflights users on 10/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/127:37 pmSAT - MDW
2 stops23h 02mMultiple Airlines
dom. 11/1610:12 amMDW - SAT
1 stop22h 52mMultiple Airlines
Deal found 10/15$182
This Expedia deal was found by Cheapflights users on 10/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/123:23 pmSAT - ORD
1 stop14h 09mSpirit Airlines
mié. 11/195:10 amORD - SAT
1 stop13h 22mSpirit Airlines
Deal found 10/15$183
This Kiwi.com deal was found by Cheapflights users on 10/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/297:00 amSAT - ORD
2 stops17h 59mMultiple Airlines
sáb. 11/17:15 amORD - SAT
1 stop7h 02mMultiple Airlines
Deal found 10/15$184

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 octubre 16, 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 AntonioChicago

SAT - ORD

SATORD

San Antonio

lun. 11/3

5:35 pm-12:11 am

1 stop6h 36m

Chicago O'Hare Intl

mié. 11/5

10:52 am-6:32 pm

1 stop7h 40m

$178

San AntonioChicago

SAT - ORD

SATORD

San Antonio

jue. 12/11

4:16 pm-11:42 pm

1 stop7h 26m

Chicago O'Hare Intl

lun. 12/15

10:18 am-10:27 pm

1 stop12h 09m

$191

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 11/13

11:40 am-3:50 pm

1 stop4h 10m

Lambert-St Louis

dom. 11/16

6:30 am-12:25 pm

1 stop5h 55m

$219

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 11/14

6:04 am-1:40 pm

1 stop7h 36m

Lambert-St Louis

dom. 11/16

5:17 am-12:03 pm

1 stop6h 46m

$219

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 12/4

6:10 pm-11:29 pm

1 stop5h 19m

Lambert-St Louis

lun. 12/8

5:12 pm-12:34 am

1 stop7h 22m

$219

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

lun. 11/24

6:13 pm-11:23 pm

1 stop5h 10m

Lambert-St Louis

mar. 12/2

12:49 pm-9:19 pm

1 stop8h 30m

$219

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 12/11

5:18 am-1:02 pm

1 stop7h 44m

Lambert-St Louis

dom. 12/14

6:00 am-1:43 pm

1 stop7h 43m

$219

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 11/13

10:46 pm-1:57 pm

1 stop15h 11m

Lambert-St Louis

dom. 11/16

7:45 pm-7:30 pm

1 stop23h 45m

$223

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 12/4

11:55 am-5:20 pm

2 stops5h 25m

Lambert-St Louis

lun. 12/8

5:45 am-12:10 pm

1 stop6h 25m

$224

San AntonioChicago

SAT - ORD

SATORD

San Antonio

mar. 11/18

3:23 pm-5:32 am

1 stop14h 09m

Chicago O'Hare Intl

vie. 11/21

6:48 am-7:21 pm

1 stop12h 33m

$226

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

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 $59). Flying from San Antonio to Illinois in January is currently the most expensive (average of $186). 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 octubre 16, 2025.

It’s optimal to fly from San Antonio to Illinois in the evening. By choosing this option you can save up to 50% 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 octubre 16, 2025.

The most flights from SAT to USIL are scheduled on a Monday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 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 octubre 16, 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
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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
8,982 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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
11,043 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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
8,097 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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
3,137 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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 4h 10m. Spirit Airlines provides one of the quickest options available for as low as $219. San Antonio and Illinois are separated by a distance of 786 mi. This flight may include one or multiple stops.

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

    $85 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 Delta, with prices starting from $99 and $110, 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%), Japan Airlines (87%), Emirates( 87%).

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

    Looking at all options, your cheapest flight can be booked for $158. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $144 on average, our data indicates $1,181 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 $59). Flying from San Antonio to Illinois in January is currently the most expensive (average of $186). 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 octubre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$97Average$210FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$208Average$302FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$235Average$386FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$247Average$428FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$256Average$425FlexibilityNo cancel feeOn-time63%

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