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$109+ 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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 56 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 June 12, 2025.

Round-trip from

$235
(Frontier)

One-way from

$109
(CheapOair)

Popular in

October

Cheapest in

February

Average price

$279
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. 7% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Frontier deal was found by Cheapflights users on 6/10. 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.
Tue 7/153:06 pmSAT - ONT
1 stop8h 46mFrontier
Tue 7/227:00 amONT - SAT
1 stop5h 21mFrontier
Deal found 6/10$235
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/178:59 amSAT - ONT
1 stop9h 06mAmerican Airlines
Mon 9/221:10 pmONT - SAT
1 stop8h 02mAmerican Airlines
Deal found 6/11$283
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/44:27 pmSAT - ONT
1 stop8h 00mDelta
Thu 8/147:05 amONT - SAT
1 stop10h 25mDelta
Deal found 6/10$285
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2911:40 amSAT - ONT
1 stop6h 00mSouthwest
Wed 7/305:30 amONT - SAT
2 stops8h 40mSouthwest
Deal found 6/10$364
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/75:56 pmSAT - ONT
1 stop5h 41mUnited Airlines
Mon 8/111:34 pmONT - SAT
1 stop8h 25mUnited Airlines
Deal found 6/10$365
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:00 amSAT - ONT
2 stops18h 59mAlaska Airlines
Tue 8/126:00 amONT - SAT
1 stop10h 37mAlaska Airlines
Deal found 6/10$440

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 June 12, 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

Tue 7/15

3:06 pm-9:52 pm

1 stop8h 46m

Ontario

Tue 7/22

7:00 am-2:21 pm

1 stop5h 21m

$235

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Wed 9/17

8:59 am-4:05 pm

1 stop9h 06m

Ontario

Mon 9/22

1:10 pm-11:12 pm

1 stop8h 02m

$283

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Mon 8/4

4:27 pm-10:27 pm

1 stop8h 00m

Ontario

Thu 8/14

7:05 am-7:30 pm

1 stop10h 25m

$285

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Tue 7/29

11:40 am-3:40 pm

1 stop6h 00m

Ontario

Wed 7/30

5:30 am-4:10 pm

2 stops8h 40m

$364

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Thu 8/7

5:56 pm-9:37 pm

1 stop5h 41m

Ontario

Wed 8/13

1:34 pm-8:57 pm

1 stop5h 23m

$365

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Tue 8/5

7:00 am-11:59 pm

2 stops18h 59m

Ontario

Wed 8/13

6:58 pm-5:40 am

1 stop8h 42m

$440

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Thu 8/21

8:18 pm-11:50 pm

1 stop5h 32m

$109

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Thu 8/14

5:00 am-9:59 am

1 stop6h 59m

$143

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Sat 8/9

4:21 pm-10:52 pm

2 stops8h 31m

$164

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Wed 8/13

7:00 am-2:46 pm

1 stop9h 46m

$172

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/9

Showing 1-10 of 13 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 June 9, 2025.

Booking 56 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 June 12, 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.

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 12, 2025.
To help decide which airline to fly from San Antonio to Ontario, see what other customers have to say about Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

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

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

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

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

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
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

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 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 $235 on this airline. Additional options worth looking into are American Airlines and Delta, starting at $283 and $285 round-trip. Users have found that Frontier is 27% cheaper than the other options available to this destination.

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

    $109 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 United Airlines, with prices starting from $143 and $164, 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$43Average$165FlexibilityNo cancel feeOn-time65%
FrontierCheapest$118Average$218FlexibilityNo cancel feeOn-time62%
DeltaCheapest$158Average$386FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$236Average$363FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$301Average$386FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$301Average$411FlexibilityNo cancel feeOn-time69%

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