HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$61+ 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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Antonio to Illinois with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$126
(Mytrip)

One-way from

$61
(Frontier)

Popular in

December

Cheapest in

April

Average price

$368

Good round-trip deal

$387 or less

Good one-way deal

$208 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. 7% potential increase in price ($32 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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

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 February 20, 2025.

This Mytrip deal was found by Cheapflights users on 2/20. 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.
Sat 4/512:21 pmSAT - STL
1 stop11h 25mFrontier
Sat 4/126:51 pmSTL - SAT
1 stop24h 10mFrontier
Deal found 2/20$126
This Frontier deal was found by Cheapflights users on 2/20. 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.
Sun 4/134:39 pmSAT - ORD
1 stop12h 15mFrontier
Tue 4/156:45 amORD - SAT
1 stop7h 09mFrontier
Deal found 2/20$160
This CheapOair deal was found by Cheapflights users on 2/19. 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 4/95:39 amSAT - ORD
1 stop8h 24mSpirit Airlines
Wed 4/162:58 pmORD - SAT
1 stop13h 36mSpirit Airlines
Deal found 2/19$162
This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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.
Tue 3/188:29 pmSAT - ORD
1 stop10h 13mMultiple Airlines
Tue 3/256:45 amORD - SAT
1 stop6h 33mMultiple Airlines
Deal found 2/20$163
This Frontier deal was found by Cheapflights users on 2/19. 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 4/45:47 pmSAT - MDW
1 stop11h 36mFrontier
Sun 4/66:45 amMDW - SAT
1 stop6h 32mFrontier
Deal found 2/19$170
This Southwest deal was found by Cheapflights users on 2/20. 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.
Mon 3/245:00 amSAT - STL
Nonstop2h 05mSouthwest
Tue 3/257:05 pmSTL - SAT
Nonstop2h 20mSouthwest
Deal found 2/20$177
This CheapOair deal was found by Cheapflights users on 2/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/252:18 pmSAT - STL
1 stop18h 58mMultiple Airlines
Thu 3/276:47 pmSTL - SAT
1 stop15h 16mMultiple Airlines
Deal found 2/18$183
This American Airlines deal was found by Cheapflights users on 2/19. 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 3/186:27 pmSAT - STL
1 stop4h 17mAmerican Airlines
Tue 3/255:37 pmSTL - SAT
1 stop5h 25mAmerican Airlines
Deal found 2/19$188
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Sat 4/55:30 amSAT - STL
2 stops9h 15mUnited Airlines
Sat 4/126:15 amSTL - SAT
1 stop4h 41mUnited Airlines
Deal found 2/20$235
This Delta deal was found by Cheapflights users on 2/19. 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 7/165:30 amSAT - STL
1 stop5h 08mDelta
Mon 7/217:05 pmSTL - SAT
1 stop5h 09mDelta
Deal found 2/19$239
This Mytrip deal was found by Cheapflights users on 2/19. 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 4/2511:48 amSAT - EVV
1 stop6h 54mMultiple Airlines
Fri 5/211:04 amEVV - SAT
1 stop23h 27mMultiple Airlines
Deal found 2/19$250
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Fri 4/116:02 amSAT - PIA
1 stop4h 54mAmerican Airlines
Mon 4/145:16 pmPIA - SAT
1 stop6h 42mAmerican Airlines
Deal found 2/20$259

Find flights from San Antonio to Illinois within your budget

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 February 20, 2025.

Fly from

San Antonio

Fly to

Illinois

Route

Depart

Return

Price

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sat 4/5

12:21 pm-11:46 pm

1 stop11h 25m

Lambert-St Louis

Sat 4/12

6:51 pm-7:01 pm

1 stop24h 10m

$126

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Sun 4/13

4:39 pm-4:54 am

1 stop12h 15m

Chicago O'Hare Intl

Tue 4/15

6:45 am-1:54 pm

1 stop7h 09m

$160

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 4/9

5:39 am-2:03 pm

1 stop8h 24m

Chicago O'Hare Intl

Wed 4/16

2:58 pm-4:34 am

1 stop13h 36m

$162

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Tue 3/18

8:29 pm-6:42 am

1 stop10h 13m

Chicago O'Hare Intl

Tue 3/25

6:45 am-1:18 pm

1 stop6h 33m

$163

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Fri 4/4

5:47 pm-5:23 am

1 stop11h 36m

Chicago Midway

Sun 4/6

6:45 am-7:01 pm

1 stop12h 16m

$170

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 3/24

5:00 am-7:05 am

Nonstop2h 05m

Lambert-St Louis

Tue 3/25

7:05 pm-9:25 pm

Nonstop2h 20m

$177

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 3/25

2:18 pm-9:16 am

1 stop18h 58m

Lambert-St Louis

Thu 3/27

6:47 pm-10:03 am

1 stop15h 16m

$183

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 3/18

6:27 pm-10:44 pm

1 stop4h 17m

Lambert-St Louis

Tue 3/25

5:37 pm-11:02 pm

1 stop5h 25m

$188

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sat 4/5

5:30 am-2:45 pm

2 stops9h 15m

Lambert-St Louis

Sat 4/12

6:15 am-10:56 am

1 stop4h 41m

$235

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 7/16

5:30 am-10:38 am

1 stop5h 08m

Lambert-St Louis

Mon 7/21

7:05 pm-12:14 am

1 stop5h 09m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

Showing 1-10 of 44 results
1
2
3
...
5

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.

Travel insights for flights from San Antonio to Illinois

Get recent, data-driven insights about flights from San Antonio to Illinois including ideal travel times, pricing trends, and more.

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 February 20, 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 February 20, 2025.

The most flights from SAT to USIL are scheduled on a Monday (20 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 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 February 20, 2025.
To help decide which airline to fly from San Antonio to Illinois, see what other customers have to say about Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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?

    $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 Southwest and Spirit Airlines, with prices starting from $89 and $93, 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 (95%), Emirates (93%), Qatar Airways( 92%).

  • 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 $155 on average our data indicates $1,084 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Antonio to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to LaGuardia flights
Dallas/Fort Worth to Seattle flights
Dallas/Fort Worth to Las Vegas flights
Dallas/Fort Worth to Orlando flights
Dallas/Fort Worth to John F Kennedy Intl flights
Dallas/Fort Worth to Newark flights
Dallas/Fort Worth to Fort Lauderdale flights
Dallas/Fort Worth to O'Hare Intl flights
Dallas/Fort Worth to Los Angeles flights
Dallas/Fort Worth to Denver flights
Dallas/Fort Worth to Dulles Intl flights
Hobby to Las Vegas flights
Hobby to Seattle flights
Dallas/Fort Worth to Miami flights
Austin to John F Kennedy Intl flights
Hobby to LaGuardia flights
George Bush Intcntl to Las Vegas flights
Dallas/Fort Worth to Baltimore flights
Hobby to John F Kennedy Intl flights
Hobby to Denver flights
Dallas/Fort Worth to Boston flights
Hobby to Baltimore flights
Dallas/Fort Worth to San Francisco flights
Austin to Newark flights
George Bush Intcntl to Seattle flights
George Bush Intcntl to John F Kennedy Intl flights
Hobby to Los Angeles flights
Dallas/Fort Worth to Santa Ana flights
Dallas/Fort Worth to Burbank flights
Hobby to Newark flights
Hobby to Orlando flights
Austin to Los Angeles flights
George Bush Intcntl to LaGuardia flights
Austin to Denver flights
Dallas/Fort Worth to Reagan-National flights
Dallas/Fort Worth to Hobby flights
Dallas/Fort Worth to San Diego flights
Dallas/Fort Worth to Atlanta flights
George Bush Intcntl to Denver flights
Dallas/Fort Worth to Midway flights
Dallas/Fort Worth to Sky Harbor Intl flights
Hobby to Dulles Intl flights
Austin to Las Vegas flights
Dallas/Fort Worth to Salt Lake City flights
Austin to Seattle flights
George Bush Intcntl to Los Angeles flights
Hobby to Sky Harbor Intl flights
Austin to O'Hare Intl flights
Hobby to Reagan-National flights
Hobby to Fort Lauderdale flights

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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$111Average$236FlexibilityNo cancel feeOn-time65%
FrontierCheapest$112Average$191FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$190Average$408FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$222Average$428FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$226Average$412FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$396FlexibilityNo cancel feeOn-timeN/A
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.