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$98+ Cheap flights from San Antonio to Ontario (SAT - ONT)

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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ONT
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheapflights Tip: The best prices from San Antonio to Ontario are usually found in February or August, booked 79 days in advance, depart on a Friday or Wednesday and return on a Wednesday

Cheap flight deals from San Antonio to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from San Antonio (SAT) to Ontario (ONT). 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 julio 31, 2025.

Round-trip from

$197
(Frontier)

One-way from

$98
(Cheapflightsfares)

Popular in

July

Cheapest in

February

Average price

$448
From San Antonio to Ontario
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One-way flight from San Antonio to Ontario
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Highest demand for flights based on searches. 4% potential increase in price ($16 potential increase over avg. RT price).
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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 July 2025
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Find flight deals from San Antonio to Ontario

Cheapest flights from San Antonio to Ontario
Explore the most affordable flight options available from San Antonio to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 31, 2025.

This Frontier deal was found by Cheapflights users on 7/30. 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.
sáb. 8/163:06 pmSAT - ONT
1 stop8h 46mFrontier
vie. 8/2212:59 amONT - SAT
1 stop11h 36mFrontier
Deal found 7/30$197
This American Airlines deal was found by Cheapflights users on 7/29. 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.
mar. 8/266:00 amSAT - ONT
1 stop5h 58mAmerican Airlines
mar. 9/211:59 pmONT - SAT
1 stop7h 31mAmerican Airlines
Deal found 7/29$237
This United Airlines deal was found by Cheapflights users on 7/29. 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.
mar. 8/265:58 pmSAT - ONT
1 stop5h 27mUnited Airlines
mar. 9/26:50 pmONT - SAT
2 stops12h 07mUnited Airlines
Deal found 7/29$242
This Delta deal was found by Cheapflights users on 7/30. 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.
mié. 8/207:30 amSAT - ONT
1 stop6h 44mDelta
sáb. 8/237:05 amONT - SAT
1 stop7h 35mDelta
Deal found 7/30$257
This Southwest deal was found by Cheapflights users on 7/30. 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.
sáb. 8/235:45 amSAT - ONT
2 stops6h 35mSouthwest
lun. 8/2511:50 amONT - SAT
1 stop6h 40mSouthwest
Deal found 7/30$303

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Antonio to Ontario 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 julio 31, 2025.
Use the filters below to find and compare flights from San Antonio to Ontario that are best for you.

Fly from

San Antonio

Fly to

Ontario

Route

Depart

Return

Price

San AntonioOntario

SAT - ONT

SATONT

San Antonio

sáb. 8/16

3:06 pm-9:52 pm

1 stop8h 46m

Ontario

vie. 8/22

12:59 am-2:35 pm

1 stop11h 36m

$197

San AntonioOntario

SAT - ONT

SATONT

San Antonio

mar. 8/26

6:00 am-9:58 am

1 stop5h 58m

Ontario

mar. 9/2

11:59 pm-9:30 am

1 stop7h 31m

$237

San AntonioOntario

SAT - ONT

SATONT

San Antonio

mar. 8/26

5:58 pm-9:25 pm

1 stop5h 27m

Ontario

mar. 9/2

6:50 pm-8:57 am

2 stops12h 07m

$242

San AntonioOntario

SAT - ONT

SATONT

San Antonio

mié. 8/20

7:30 am-12:14 pm

1 stop6h 44m

Ontario

sáb. 8/23

7:05 am-4:40 pm

1 stop7h 35m

$257

San AntonioOntario

SAT - ONT

SATONT

San Antonio

sáb. 8/23

5:45 am-10:20 am

2 stops6h 35m

Ontario

lun. 8/25

11:50 am-8:30 pm

1 stop6h 40m

$303

San AntonioOntario

SAT - ONT

SATONT

San Antonio

mié. 9/3

6:27 am-2:12 pm

1 stop9h 45m

Ontario

vie. 9/5

6:00 am-6:53 pm

1 stop10h 53m

$356

San AntonioOntario

SAT - ONT

SATONT

San Antonio

sáb. 9/13

3:22 pm-7:54 pm

1 stop6h 32m

$98

San AntonioOntario

SAT - ONT

SATONT

San Antonio

mié. 10/22

7:00 am-10:07 am

1 stop5h 07m

$120

San AntonioOntario

SAT - ONT

SATONT

San Antonio

sáb. 8/23

5:45 am-10:20 am

2 stops6h 35m

$124

San AntonioOntario

SAT - ONT

SATONT

San Antonio

mar. 9/2

4:22 pm-9:25 pm

1 stop7h 03m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 12 results
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Best time to book a flight from San Antonio to Ontario

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

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

Use this chart to determine the optimal time to book a round-trip flight from San Antonio to Ontario. Price data was last updated on July 25, 2025.

Booking 79 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Antonio to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, August is the cheapest month in which you can book a flight from San Antonio to Ontario (average of $246). Flying from San Antonio to Ontario in March is currently the most expensive (average of $328). 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 ONT?

Find hourly flight availability from San Antonio to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 31, 2025.

One of the essential ways to save on airfare from San Antonio to Ontario is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 33% on airfare.

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

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

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

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

Average round-trip fare for 1-stop flights from San Antonio to Ontario, 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 $150.

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

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

Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 5h 10m.

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

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

Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 1h 15m.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated julio 31, 2025.
Read through reviews of airlines operating flights from San Antonio to Ontario, such as Alaska Airlines, Southwest, and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

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

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

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
4,244 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

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
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

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
8,902 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

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 San Antonio to Ontario. 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 San Antonio to Ontario round-trip?

    Our cheapest airline available from San Antonio to Ontario is Frontier. Our recent data shows that you can find tickets from as low as $197 on this airline. Additional options worth looking into are American Airlines and United Airlines, starting at $237 and $242 round-trip. Users have found that Frontier is 42% cheaper than the other options available to this destination.

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

    $98 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on American Airlines and Southwest, with prices starting from $120 and $124, respectively.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from San Antonio to Ontario (average of $246). Flying from San Antonio to Ontario in March is currently the most expensive (average of $328). 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

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Alternative routes for San Antonio to Ontario

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Top 6 airlines flying from San Antonio to Ontario

Discover the top 6 airlines that operate flights from San Antonio to Ontario. 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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$106Average$165FlexibilityNo cancel feeOn-time65%
FrontierCheapest$115Average$227FlexibilityNo cancel feeOn-time62%
DeltaCheapest$158Average$256FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$236Average$366FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$301Average$386FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$301Average$411FlexibilityNo cancel feeOn-time69%

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