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$85+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAT
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to San Antonio are usually found in August or January, 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 July 28, 2025.

Round-trip from

$196
(Cheapflightsfares)

One-way from

$85
(Trip.com)

Popular in

March

Cheapest in

August

Average price

$326
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 July 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 July 28, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/186:00 amONT - SAT
1 stop5h 23mFrontier
Sat 9/203:22 pmSAT - ONT
1 stop6h 32mFrontier
Deal found 7/27$196
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Sat 9/1312:47 pmONT - SAT
1 stop6h 04mAmerican Airlines
Wed 9/175:00 amSAT - ONT
1 stop7h 04mAmerican Airlines
Deal found 7/27$237
This Southwest deal was found by Cheapflights users on 7/25. 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.
Tue 8/265:45 amONT - SAT
2 stops7h 10mSouthwest
Wed 8/277:50 amSAT - ONT
2 stops7h 30mSouthwest
Deal found 7/25$247
This United Airlines deal was found by Cheapflights users on 7/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/235:10 amONT - SAT
2 stops8h 16mUnited Airlines
Sat 8/309:50 amSAT - ONT
2 stops9h 47mUnited Airlines
Deal found 7/26$312
This Delta deal was found by Cheapflights users on 7/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/85:09 pmONT - SAT
1 stop5h 26mDelta
Mon 8/186:07 pmSAT - ONT
1 stop7h 33mDelta
Deal found 7/25$352

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 July 28, 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

Thu 9/18

6:00 am-1:23 pm

1 stop5h 23m

San Antonio

Sat 9/20

3:22 pm-7:54 pm

1 stop6h 32m

$196

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 9/13

12:47 pm-8:51 pm

1 stop6h 04m

San Antonio

Wed 9/17

5:00 am-10:04 am

1 stop7h 04m

$237

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 8/26

5:45 am-2:55 pm

2 stops7h 10m

San Antonio

Wed 8/27

7:50 am-1:20 pm

2 stops7h 30m

$247

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 8/23

5:10 am-3:26 pm

2 stops8h 16m

San Antonio

Sat 8/30

9:50 am-5:37 pm

2 stops9h 47m

$312

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 8/8

5:09 pm-12:35 am

1 stop5h 26m

San Antonio

Mon 8/18

6:07 pm-11:40 pm

1 stop7h 33m

$352

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 8/12

7:00 am-6:36 pm

1 stop9h 36m

$85

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 10/10

12:59 am-3:14 pm

1 stop12h 15m

$86

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 8/19

6:05 am-1:39 pm

1 stop5h 34m

$129

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 8/26

5:10 am-12:48 pm

1 stop5h 38m

$159

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 8/19

12:22 pm-10:59 pm

2 stops8h 37m

$164

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 13 results
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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 July 25, 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 July 28, 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.

What’s the top layover airport for flights from Ontario to San Antonio?

Share of 1-stop round-trip flights from Ontario to San Antonio chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 50% of 1-stop itineraries from Ontario to San Antonio on Cheapflights.

What’s the cheapest layover airport for flights from Ontario to San Antonio?

Average round-trip fare for 1-stop flights from Ontario to San Antonio, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $130.

What’s the fastest layover option from Ontario to San Antonio?

Shortest average travel time for 1-stop one-way flights from Ontario to San Antonio, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Houston (HOU) have the shortest average one-way travel time for 1-stop routes: 2h 45m.

Which airport typically offers the quickest layover for flights from Ontario to San Antonio?

Average layover duration for 1-stop one-way flights from Ontario to San Antonio, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Houston (HOU) offer the fastest connection on this route, with an average layover time of 1h 20m.

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 July 28, 2025.
See what other customers who have flown with Southwest, Delta, and United 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
4,237 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
8.0
Very good
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
7,971 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
8,893 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
8.0
Very good
4,237 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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.
Frontier
5.9
Fair
3,238 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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 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.

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

    According to our current data, Frontier ($196), American Airlines ($237), and Southwest ($247) offers the cheapest pricing from Ontario to San Antonio. Frontier is 43% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airlines for a one-way flight from Ontario to San Antonio are Frontier ($86), Delta ($129), and United Airlines ($159).

  • 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

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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 July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$91Average$175FlexibilityNo cancel feeOn-time65%
FrontierCheapest$117Average$221FlexibilityNo cancel feeOn-time62%
DeltaCheapest$200Average$352FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$232Average$388FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$281Average$389FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$306Average$408FlexibilityNo cancel feeOn-time69%

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