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San Antonio

$71+ Cheap flights from Ontario to San Antonio (ONT - SAT)

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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAT
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to San Antonio are usually found in January or August, booked 59 days in advance, depart on a Wednesday or Saturday and return on a Friday

Cheap flight deals from Ontario to San Antonio

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Antonio (SAT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$143
(Mytrip)

One-way from

$71
(Kiwi.com)

Popular in

March

Cheapest in

January

Average price

$307
From Ontario to San Antonio
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One-way flight from Ontario to San Antonio
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Highest demand for flights based on searches. 6% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to San Antonio

Cheapest flights from Ontario to San Antonio
Explore the most affordable flight options available from Ontario to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Gotogate deal was found by Cheapflights users on 9/8. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/278:59 pmONT - SAT
1 stop10h 11mFrontier
Mon 9/298:20 pmSAT - ONT
1 stop25h 34mFrontier
Deal found 9/8$143
This Booking.com deal was found by Cheapflights users on 9/10. 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.
Fri 10/1011:53 amONT - SAT
1 stop5h 42mFrontier
Fri 10/178:20 pmSAT - ONT
1 stop5h 30mFrontier
Deal found 9/10$144
This Booking.com deal was found by Cheapflights users on 9/10. 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.
Fri 9/194:08 pmONT - SAT
1 stop20h 19mFrontier
Mon 9/228:20 pmSAT - ONT
1 stop25h 34mFrontier
Deal found 9/10$145
This Mytrip deal was found by Cheapflights users on 9/10. 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 11/88:00 amONT - SAT
1 stop5h 35mFrontier
Sat 11/153:12 pmSAT - ONT
1 stop10h 38mFrontier
Deal found 9/10$148
This Booking.com deal was found by Cheapflights users on 9/10. 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.
Sun 9/2810:28 pmONT - SAT
1 stop12h 48mFrontier
Thu 10/29:33 pmSAT - ONT
1 stop11h 44mFrontier
Deal found 9/10$151
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 11/146:00 amONT - SAT
1 stop5h 19mFrontier
Sun 11/168:25 pmSAT - ONT
1 stop5h 25mFrontier
Deal found 9/9$152
This Frontier deal was found by Cheapflights users on 9/11. 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 10/96:53 amONT - SAT
1 stop10h 48mFrontier
Thu 10/168:26 pmSAT - ONT
1 stop5h 24mFrontier
Deal found 9/11$153
This Frontier deal was found by Cheapflights users on 9/10. 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 9/259:16 amONT - SAT
1 stop9h 32mFrontier
Thu 10/29:33 pmSAT - ONT
1 stop11h 44mFrontier
Deal found 9/10$154
This Frontier deal was found by Cheapflights users on 9/11. 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.
Sat 10/48:59 pmONT - SAT
1 stop10h 11mFrontier
Sun 10/59:33 pmSAT - ONT
1 stop11h 44mFrontier
Deal found 9/11$155
This Frontier deal was found by Cheapflights users on 9/10. 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 9/256:00 amONT - SAT
1 stop5h 23mFrontier
Fri 10/312:41 pmSAT - ONT
1 stop9h 13mFrontier
Deal found 9/10$159
This Priceline deal was found by Cheapflights users on 9/11. 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.
Mon 10/66:00 amONT - SAT
1 stop5h 16mFrontier
Tue 10/73:59 pmSAT - ONT
1 stop9h 51mFrontier
Deal found 9/11$165

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to San Antonio 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 September 11, 2025.
Use the filters below to find and compare flights from Ontario to San Antonio that are best for you.

Fly from

Ontario

Fly to

San Antonio

Route

Depart

Return

Price

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 9/26

8:59 pm-2:27 pm

1 stop15h 28m

San Antonio

Mon 9/29

8:20 pm-7:54 pm

1 stop25h 34m

$143

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 9/24

8:59 pm-7:15 pm

1 stop20h 16m

San Antonio

Sun 9/28

8:20 pm-7:53 am

1 stop13h 33m

$145

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 11/13

6:53 am-7:43 pm

1 stop10h 50m

San Antonio

Sun 11/16

10:46 pm-7:17 am

1 stop10h 31m

$154

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 9/27

8:59 pm-9:10 am

1 stop10h 11m

San Antonio

Mon 11/3

2:04 pm-9:55 pm

1 stop9h 51m

$159

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 10/18

7:04 am-4:37 pm

1 stop7h 33m

San Antonio

Sat 10/25

5:32 pm-11:50 pm

1 stop8h 18m

$165

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 10/7

7:04 am-3:14 pm

1 stop6h 10m

San Antonio

Fri 10/10

8:21 pm-11:50 pm

1 stop5h 29m

$175

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 10/9

6:53 am-7:41 pm

1 stop10h 48m

San Antonio

Mon 10/13

2:04 pm-10:05 pm

1 stop10h 01m

$178

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 10/18

7:04 am-4:37 pm

1 stop7h 33m

San Antonio

Sun 10/19

9:52 pm-7:47 am

1 stop11h 55m

$181

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Mon 10/20

10:50 pm-3:14 pm

2 stops14h 24m

San Antonio

Wed 10/22

3:59 pm-11:50 pm

1 stop9h 51m

$189

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 10/30

6:00 am-1:19 pm

1 stop5h 19m

San Antonio

Sun 11/2

8:25 pm-11:50 pm

1 stop5h 25m

$192

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 22 results
1
2
3

Best time to book a flight from Ontario to San Antonio

Have a flexible travel schedule? Discover the best time to fly to San Antonio from Ontario 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 Ontario to San Antonio

How far ahead should I book a flight from Ontario to San Antonio?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to San Antonio. Price data was last updated on August 29, 2025.

The best time to book flights from Ontario to San Antonio is 59 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Ontario to San Antonio?

Currently, August is the cheapest month in which you can book a flight from Ontario to San Antonio (average of $295). Flying from Ontario to San Antonio in March is currently the most expensive (average of $376). 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 ONT to SAT?

Find hourly flight availability from Ontario to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s typically best to fly out from Ontario to San Antonio in the evening. Doing so could potentially save you 24% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Ontario to San Antonio?

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Antonio. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to San Antonio flight should consider departing on Saturday afternoons when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing San Antonio

Get insights into the airlines that provide service to San Antonio. 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 San Antonio. Reviews last updated September 11, 2025.
See what other customers who have flown with Southwest, United Airlines, and American Airlines from Ontario to San Antonio have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Spirit Airlines
6.3
Okay
8,023 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Antonio. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    For as low as $143, Frontier can have you in San Antonio from Ontario in 15h 28m. The distance between Ontario and San Antonio is about 1163 mi.

  • What are the cheapest airlines flying from Ontario to San Antonio round-trip?

    According to our current data, Spirit Airlines ($104), Frontier ($117), and Delta ($200) offers the cheapest pricing from Ontario to San Antonio. Spirit Airlines is 70% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Ontario to San Antonio that include hotel bookings?

    Yes. In addition to deals on Ontario to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to San Antonio?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Antonio.

  • Can I find deals for business class flights from Ontario to San Antonio?

    Yes. Cheapflights offers flight deals from Ontario to San Antonio 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 Ontario to San Antonio?

    Currently, August is the cheapest month in which you can book a flight from Ontario to San Antonio (average of $295). Flying from Ontario to San Antonio in March is currently the most expensive (average of $376). 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

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville

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See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ontario to San Antonio

Discover the top 6 airlines that operate flights from Ontario to San Antonio. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$104Average$172FlexibilityNo cancel feeOn-time65%
FrontierCheapest$117Average$228FlexibilityNo cancel feeOn-time62%
DeltaCheapest$200Average$329FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$236Average$388FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$275Average$387FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$304Average$432FlexibilityNo cancel feeOn-time69%

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