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$80+ 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAT
May 20 — May 271
Tue 5/20
Tue 5/27
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 May 15, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$148
(Cheapflightsfares)

One-way from

$80
(Frontier)

Popular in

March

Cheapest in

August

Average price

$356
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
Highest demand for flights based on searches. 5% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 15, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 5/14. 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.
Sat 6/217:00 amONT - SAT
1 stop5h 00mFrontier
Sun 6/228:12 pmSAT - ONT
1 stop5h 38mFrontier
Deal found 5/14$148
This Travelocity deal was found by Cheapflights users on 5/15. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/221:28 pmONT - SAT
1 stop8h 31mMultiple Airlines
Sat 10/254:12 pmSAT - ONT
1 stop9h 38mMultiple Airlines
Deal found 5/15$263
This Delta deal was found by Cheapflights users on 5/14. 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.
Sat 5/2412:18 pmONT - SAT
1 stop7h 38mDelta
Wed 5/286:10 pmSAT - ONT
1 stop7h 32mDelta
Deal found 5/14$317
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Mon 8/186:00 amONT - SAT
1 stop7h 32mUnited Airlines
Wed 8/201:44 pmSAT - ONT
2 stops8h 49mUnited Airlines
Deal found 5/14$346
This American Airlines deal was found by Cheapflights users on 5/14. 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.
Mon 8/412:59 amONT - SAT
1 stop5h 26mAmerican Airlines
Fri 8/89:10 amSAT - ONT
1 stop5h 00mAmerican Airlines
Deal found 5/14$347
This Southwest deal was found by Cheapflights users on 5/14. 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 8/55:25 amONT - SAT
1 stop5h 05mSouthwest
Fri 8/811:45 amSAT - ONT
2 stops6h 50mSouthwest
Deal found 5/14$377
This Alaska Airlines deal was found by Cheapflights users on 5/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/211:39 amONT - SAT
1 stop10h 20mAlaska Airlines
Fri 9/56:30 amSAT - ONT
1 stop30h 14mAlaska Airlines
Deal found 5/14$393

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 May 15, 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

Sat 6/21

7:00 am-2:00 pm

1 stop5h 00m

San Antonio

Sun 6/22

8:12 pm-11:50 pm

1 stop5h 38m

$148

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 10/22

1:28 pm-11:59 pm

1 stop8h 31m

San Antonio

Sat 10/25

4:12 pm-11:50 pm

1 stop9h 38m

$263

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 5/30

12:45 pm-10:03 pm

1 stop7h 18m

San Antonio

Wed 6/11

6:17 pm-11:59 pm

1 stop7h 42m

$317

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 7/1

10:05 pm-9:45 am

1 stop9h 40m

San Antonio

Fri 7/11

6:03 pm-11:42 pm

1 stop7h 39m

$336

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Mon 8/18

6:00 am-3:32 pm

1 stop7h 32m

San Antonio

Wed 8/20

1:44 pm-8:33 pm

2 stops8h 49m

$346

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 8/5

5:25 am-12:30 pm

1 stop5h 05m

San Antonio

Fri 8/8

11:45 am-4:35 pm

2 stops6h 50m

$377

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 9/2

11:39 am-11:59 pm

1 stop10h 20m

San Antonio

Fri 9/5

6:30 am-10:44 am

1 stop30h 14m

$393

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 7/22

7:00 am-2:09 pm

1 stop5h 09m

$80

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 7/12

7:00 am-3:35 pm

1 stop6h 35m

$99

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 7/1

5:08 pm-12:32 am

1 stop5h 24m

$143

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/15

Showing 1-10 of 15 results
1
2

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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightnetworkPrice Accuracy-Trust Score*3 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Antonio flight deals on Cheapflights vs. FlightHub >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 May 9, 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 May 15, 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.

Rainfall in San Antonio by month

Plan your trip to San Antonio by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Antonio ranges from 1.6 - 3.7 inches per month. May is typically the wettest month, when rainfall can reach 3.7 in. December is typically the driest time to visit San Antonio when rainfall is around 1.6 in.

Temperature in San Antonio by month

Plan your trip to San Antonio by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Antonio, 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 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 May 15, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Ontario to San Antonio to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,290 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,435 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,731 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 ($148), American Airlines ($317), and Delta ($336) offers the cheapest pricing from Ontario to San Antonio. Frontier is 57% 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 ($80), Delta ($143), and United Airlines ($164).

  • 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 Ontario?

Book flights to Ontario 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 May 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$75Average$167FlexibilityNo cancel feeOn-time65%
FrontierCheapest$118Average$210FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$238Average$378FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$286Average$394FlexibilityNo cancel feeOn-time69%
DeltaCheapest$302Average$352FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$308Average$391FlexibilityNo cancel feeOn-time63%

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