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San Antonio

$55+ 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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAT
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
1 adult, Economy
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Find cheap flights from Ontario to San Antonio 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

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Cheapflights Tip: The best prices from Ontario to San Antonio are usually found in October or January, booked 65 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 November 6, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$110
(Frontier)

One-way from

$55
(CheapOair)

Popular in

December

Cheapest in

October

Average price

$324
Provider with most accurate pricing for Ontario-San Antonio flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-San Antonio flights.
Search Deals
From Ontario to San Antonio
Search Deals
One-way flight from Ontario to San Antonio
Search Deals
High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
Search Deals

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 November 6, 2025.

This Priceline deal was found by Cheapflights users on 11/6. 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.
Thu 12/46:15 amONT - SAT
1 stop4h 41mFrontier
Thu 12/111:51 pmSAT - ONT
1 stop9h 26mFrontier
Deal found 11/6$110
This Frontier deal was found by Cheapflights users on 11/6. 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.
Wed 11/1912:58 amONT - SAT
1 stop11h 30mFrontier
Mon 11/241:50 pmSAT - ONT
1 stop9h 16mFrontier
Deal found 11/6$127
This Mytrip deal was found by Cheapflights users on 11/6. 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.
Thu 12/42:59 pmONT - SAT
1 stop19h 57mFrontier
Sun 12/77:56 pmSAT - ONT
1 stop20h 29mFrontier
Deal found 11/6$128
This CheapOair deal was found by Cheapflights users on 11/4. 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 11/2512:58 amONT - SAT
1 stop21h 22mFrontier
Fri 11/2811:39 amSAT - ONT
1 stop24h 32mFrontier
Deal found 11/4$138
This Mytrip deal was found by Cheapflights users on 11/6. 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 12/56:15 amONT - SAT
1 stop4h 41mFrontier
Sun 12/77:56 pmSAT - ONT
1 stop20h 29mFrontier
Deal found 11/6$142
This Booking.com deal was found by Cheapflights users on 11/4. 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 12/126:15 amONT - SAT
1 stop4h 41mFrontier
Sun 12/1410:25 amSAT - ONT
1 stop6h 41mFrontier
Deal found 11/4$143
This CheapOair deal was found by Cheapflights users on 11/6. 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 11/2112:58 amONT - SAT
1 stop7h 12mFrontier
Wed 11/267:00 amSAT - ONT
1 stop6h 28mFrontier
Deal found 11/6$144
This Kiwi.com deal was found by Cheapflights users on 11/6. 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.
Sat 12/133:20 pmONT - SAT
1 stop16h 10mFrontier
Sat 1/31:33 pmSAT - ONT
1 stop12h 26mFrontier
Deal found 11/6$145
This Frontier deal was found by Cheapflights users on 11/6. 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.
Wed 11/198:45 amONT - SAT
1 stop8h 00mFrontier
Thu 11/203:23 pmSAT - ONT
1 stop10h 34mFrontier
Deal found 11/6$160
This Kiwi.com deal was found by Cheapflights users on 11/6. 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.
Thu 12/46:15 amONT - SAT
1 stop4h 41mMultiple Airlines
Tue 12/97:00 amSAT - ONT
2 stops16h 17mMultiple Airlines
Deal found 11/6$161
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/126:15 amONT - SAT
1 stop4h 41mMultiple Airlines
Mon 12/1512:37 pmSAT - ONT
1 stop10h 40mMultiple Airlines
Deal found 11/5$167

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 November 6, 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 12/4

2:59 pm-12:56 pm

1 stop19h 57m

San Antonio

Thu 12/11

1:51 pm-1:10 pm

1 stop25h 19m

$110

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 1/8

6:30 am-12:56 pm

1 stop4h 26m

San Antonio

Sat 1/10

3:51 pm-10:40 pm

1 stop8h 49m

$110

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 12/4

6:15 am-12:56 pm

1 stop4h 41m

San Antonio

Sun 12/7

7:56 pm-2:25 pm

1 stop20h 29m

$128

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 11/26

12:58 am-12:20 am

1 stop21h 22m

San Antonio

Mon 12/1

1:50 pm-9:06 pm

1 stop9h 16m

$144

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 11/20

12:58 am-11:59 am

1 stop9h 01m

San Antonio

Wed 11/26

7:00 am-11:28 am

1 stop6h 28m

$144

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 11/21

7:48 pm-10:10 am

1 stop12h 22m

San Antonio

Thu 12/11

1:51 pm-9:17 pm

1 stop9h 26m

$144

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 12/4

6:15 am-12:56 pm

1 stop4h 41m

San Antonio

Thu 12/11

5:40 am-9:17 pm

2 stops17h 37m

$169

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 11/26

5:06 pm-1:23 pm

1 stop18h 17m

San Antonio

Sat 11/29

7:00 am-11:57 pm

1 stop18h 57m

$188

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 12/18

6:17 pm-1:16 pm

1 stop16h 59m

San Antonio

Tue 12/23

10:18 am-5:15 pm

2 stops32h 57m

$211

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 1/29

6:00 am-9:18 am

1 stop25h 18m

$61

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 21 results
1
2
3

Compare providers for flights from Ontario to San Antonio

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to San Antonio in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-San Antonio flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-San Antonio flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-San Antonio flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-San Antonio flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-San Antonio flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 October 31, 2025.

The best time to book flights from Ontario to San Antonio is 65 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, September is the cheapest month in which you can book a flight from Ontario to San Antonio (average of $58). Flying from Ontario to San Antonio in March is currently the most expensive (average of $97). 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 November 6, 2025.

It’s typically best to fly out from Ontario to San Antonio in the evening. Doing so could potentially save you 23% 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 November 6, 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
4,240 reviews

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
9,007 reviews
Southwest
8.0
Very good
4,240 reviews

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
11,040 reviews
Southwest
8.0
Very good
4,240 reviews

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
8,123 reviews
Southwest
8.0
Very good
4,240 reviews

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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
3,115 reviews
Southwest
8.0
Very good
4,240 reviews

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Comfort

8.0

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 $110, Frontier can have you in San Antonio from Ontario in 19h 57m. 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, Frontier ($107), Spirit Airlines ($118), and Delta ($200) offers the cheapest pricing from Ontario to San Antonio. Frontier is 68% 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, September is the cheapest month in which you can book a flight from Ontario to San Antonio (average of $58). Flying from Ontario to San Antonio in March is currently the most expensive (average of $97). 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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Alternative routes for Ontario to San Antonio

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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 November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$217FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$118Average$174FlexibilityNo cancel feeOn-time65%
DeltaCheapest$200Average$336FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$226Average$388FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$256Average$387FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$270Average$406FlexibilityNo cancel feeOn-time69%

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