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$89+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ORD
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$187
(Southwest)

One-way from

$89
(Southwest)

Popular in

March

Cheapest in

April

Average price

$472

Good round-trip deal

$388 or less

Good one-way deal

$198 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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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 28, 2025.

This Southwest deal was found by Cheapflights users on 3/26. 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.
Tue 5/202:25 pmSAT - STL
Nonstop2h 10mSouthwest
Tue 5/275:20 amSTL - SAT
1 stop3h 45mSouthwest
Deal found 3/26$187
This CheapOair deal was found by Cheapflights users on 3/27. 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 5/15:03 pmSAT - ORD
1 stop6h 13mSpirit Airlines
Sat 5/34:55 pmORD - SAT
1 stop8h 15mSpirit Airlines
Deal found 3/27$195
This CheapOair deal was found by Cheapflights users on 3/27. 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 4/257:59 pmSAT - STL
1 stop28h 05mFrontier
Sun 4/279:55 pmSTL - SAT
1 stop14h 42mFrontier
Deal found 3/27$200
This CheapOair deal was found by Cheapflights users on 3/27. 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 5/91:43 pmSAT - ORD
1 stop15h 27mFrontier
Sat 5/104:15 pmORD - SAT
1 stop17h 37mFrontier
Deal found 3/27$200
This CheapOair deal was found by Cheapflights users on 3/27. 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 5/81:43 pmSAT - MDW
1 stop25h 05mFrontier
Sun 5/116:15 amMDW - SAT
1 stop30h 28mFrontier
Deal found 3/27$200
This CheapOair deal was found by Cheapflights users on 3/27. 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 5/72:37 pmSAT - ORD
1 stop14h 48mMultiple Airlines
Thu 5/88:14 pmORD - SAT
1 stop16h 29mMultiple Airlines
Deal found 3/27$210
This American Airlines deal was found by Cheapflights users on 3/27. 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 5/76:34 pmSAT - ORD
Nonstop2h 55mAmerican Airlines
Thu 5/88:47 pmORD - SAT
Nonstop3h 03mAmerican Airlines
Deal found 3/27$217
This Southwest deal was found by Cheapflights users on 3/25. 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 4/177:00 amSAT - MDW
Nonstop2h 40mSouthwest
Wed 4/307:15 pmMDW - SAT
Nonstop2h 50mSouthwest
Deal found 3/25$217
This Delta deal was found by Cheapflights users on 3/27. 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 4/3012:13 pmSAT - STL
1 stop5h 49mDelta
Sun 5/47:01 pmSTL - SAT
1 stop5h 29mDelta
Deal found 3/27$218
This United Airlines deal was found by Cheapflights users on 3/27. 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.
Thu 5/86:06 pmSAT - ORD
1 stop6h 09mUnited Airlines
Mon 5/127:48 pmORD - SAT
Nonstop3h 11mUnited Airlines
Deal found 3/27$227
This Delta deal was found by Cheapflights users on 3/26. 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 4/165:30 amSAT - MDW
1 stop6h 33mDelta
Wed 4/233:02 pmMDW - SAT
1 stop7h 38mDelta
Deal found 3/26$237
This United Airlines deal was found by Cheapflights users on 3/27. 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.
Sun 8/245:30 amSAT - STL
1 stop4h 31mUnited Airlines
Sun 8/245:30 pmSTL - SAT
1 stop5h 30mUnited Airlines
Deal found 3/27$244

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 March 28, 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

Tue 5/20

2:25 pm-4:35 pm

Nonstop2h 10m

Lambert-St Louis

Tue 5/27

5:20 am-9:05 am

1 stop3h 45m

$187

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 5/1

5:03 pm-11:16 pm

1 stop6h 13m

Chicago O'Hare Intl

Sat 5/3

4:55 pm-1:10 am

1 stop8h 15m

$195

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 4/25

7:59 pm-12:04 am

1 stop28h 05m

Lambert-St Louis

Sun 4/27

9:55 pm-12:37 pm

1 stop14h 42m

$200

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Fri 5/9

1:43 pm-5:10 am

1 stop15h 27m

Chicago O'Hare Intl

Sat 5/10

4:15 pm-9:52 am

1 stop17h 37m

$200

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Thu 5/8

1:43 pm-2:48 pm

1 stop25h 05m

Chicago Midway

Sun 5/11

6:15 am-12:43 pm

1 stop30h 28m

$200

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 5/7

2:37 pm-5:25 am

1 stop14h 48m

Chicago O'Hare Intl

Thu 5/8

8:14 pm-12:43 pm

1 stop16h 29m

$210

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Wed 5/7

6:34 pm-9:29 pm

Nonstop2h 55m

Chicago O'Hare Intl

Thu 5/8

8:47 pm-11:50 pm

Nonstop3h 03m

$217

San AntonioChicago

SAT - MDW

SATMDW

San Antonio

Thu 4/17

7:00 am-9:40 am

Nonstop2h 40m

Chicago Midway

Wed 4/30

7:15 pm-10:05 pm

Nonstop2h 50m

$217

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 4/30

12:13 pm-6:02 pm

1 stop5h 49m

Lambert-St Louis

Sun 5/4

7:01 pm-12:30 am

1 stop5h 29m

$218

San AntonioChicago

SAT - ORD

SATORD

San Antonio

Thu 5/8

6:06 pm-12:15 am

1 stop6h 09m

Chicago O'Hare Intl

Mon 5/12

7:48 pm-10:59 pm

Nonstop3h 11m

$227

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 50 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 $323). 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 March 28, 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.

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 March 28, 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
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

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
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

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.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

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.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

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
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

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
10,000 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

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.

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

    $89 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on American Airlines and Delta, with prices starting from $94 and $99, 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: Royal Jordanian (95%), Qatar Airways (93%), Japan Airlines( 92%).

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

    Looking at all options, your cheapest flight can be booked for $159. While the most popular route (San Antonio - Chicago O'Hare Intl) can be booked for $188 on average our data indicates $1,825 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 $323). 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.

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Alternative routes for San Antonio to Illinois

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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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$111Average$232FlexibilityNo cancel feeOn-time65%
FrontierCheapest$112Average$192FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$222Average$428FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$226Average$415FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$243Average$409FlexibilityNo cancel feeOn-time71%
DeltaCheapest$258Average$397FlexibilityNo cancel feeOn-timeN/A
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