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Ontario

$61+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ONT
ene. 11 — ene. 181
dom. 1/11
dom. 1/18
1 adult, Economy
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Find cheap flights from San Antonio to Ontario with Cheapflights

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Cheapflights Tip: The best prices from San Antonio to Ontario are usually found in February or January, booked 11 days in advance, depart on a Friday or Wednesday and return on a Wednesday

Cheap 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 diciembre 12, 2025.

This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:45 amSAT - ONT
1 stop19h 14mFrontier
lun. 1/56:00 amONT - SAT
1 stop5h 16mFrontier
Deal found 12/10$194
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/296:45 amSAT - ONT
1 stop19h 14mFrontier
lun. 1/56:00 amONT - SAT
1 stop5h 16mFrontier
Deal found 12/10$225
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/256:45 amSAT - ONT
1 stop19h 14mFrontier
jue. 1/16:45 amONT - SAT
1 stop26h 36mFrontier
Deal found 12/11$233
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/296:45 amSAT - ONT
1 stop19h 14mFrontier
mié. 12/316:45 amONT - SAT
1 stop15h 32mFrontier
Deal found 12/10$239
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/1410:25 amSAT - ONT
1 stop6h 41mFrontier
mié. 1/77:00 amONT - SAT
1 stop6h 00mFrontier
Deal found 12/11$267
This Booking.com deal was found by Cheapflights users on 12/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/246:45 amSAT - ONT
1 stop19h 14mFrontier
jue. 12/256:45 amONT - SAT
1 stop15h 32mFrontier
Deal found 12/10$272
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:45 amSAT - ONT
1 stop19h 14mFrontier
dom. 1/46:37 pmONT - SAT
1 stop16h 39mFrontier
Deal found 12/11$303
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/222:01 pmSAT - ONT
1 stop5h 14mFrontier
mié. 12/246:45 amONT - SAT
1 stop15h 32mFrontier
Deal found 12/10$304
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/222:01 pmSAT - ONT
1 stop9h 16mFrontier
mié. 1/77:00 amONT - SAT
1 stop6h 00mFrontier
Deal found 12/11$313
This Booking.com deal was found by Cheapflights users on 12/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/2912:18 pmSAT - ONT
1 stop13h 41mFrontier
mar. 12/306:45 amONT - SAT
1 stop15h 32mFrontier
Deal found 12/11$316
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/252:09 pmSAT - ONT
1 stop11h 50mFrontier
sáb. 12/276:00 amONT - SAT
1 stop6h 07mFrontier
Deal found 12/11$317
This Frontier deal was found by Cheapflights users on 12/10. 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.
mié. 12/242:09 pmSAT - ONT
1 stop11h 50mFrontier
sáb. 12/276:00 amONT - SAT
1 stop6h 07mFrontier
Deal found 12/10$318

Find 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 diciembre 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$129
(CheapOair)

One-way from

$61
(Trip.com)

Popular in

July

Cheapest in

February

Average price

$389
Provider with most accurate pricing for San Antonio-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Antonio-Ontario flights.
Search Deals
From San Antonio to Ontario
Search Deals
One-way flight from San Antonio to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($43 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 diciembre 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

mié. 1/7

3:55 pm-11:14 pm

1 stop9h 19m

Ontario

mié. 1/14

7:15 am-9:30 am

1 stop24h 15m

$139

San AntonioOntario

SAT - ONT

SATONT

San Antonio

sáb. 1/3

2:52 pm-11:21 pm

1 stop10h 29m

Ontario

mié. 1/7

7:00 am-3:00 pm

1 stop6h 00m

$173

San AntonioOntario

SAT - ONT

SATONT

San Antonio

sáb. 1/10

3:55 pm-11:14 pm

1 stop9h 19m

Ontario

dom. 1/11

10:18 pm-11:00 am

1 stop10h 42m

$217

San AntonioOntario

SAT - ONT

SATONT

San Antonio

vie. 1/30

9:59 pm-1:34 pm

1 stop17h 35m

Ontario

lun. 2/2

1:05 pm-8:46 pm

1 stop5h 41m

$218

San AntonioOntario

SAT - ONT

SATONT

San Antonio

jue. 1/15

10:15 am-11:59 pm

1 stop15h 44m

Ontario

dom. 1/18

6:10 am-10:22 am

1 stop26h 12m

$218

San AntonioOntario

SAT - ONT

SATONT

San Antonio

mié. 12/31

6:45 am-5:22 pm

2 stops36h 37m

Ontario

lun. 1/5

6:00 pm-5:37 am

1 stop9h 37m

$267

San AntonioOntario

SAT - ONT

SATONT

San Antonio

lun. 1/5

2:01 pm-5:15 pm

1 stop5h 14m

Ontario

lun. 1/12

4:03 pm-5:45 pm

1 stop23h 42m

$273

San AntonioOntario

SAT - ONT

SATONT

San Antonio

vie. 1/9

6:30 am-9:23 pm

2 stops16h 53m

Ontario

dom. 1/11

7:19 pm-11:00 am

1 stop13h 41m

$296

San AntonioOntario

SAT - ONT

SATONT

San Antonio

sáb. 1/17

7:35 am-12:16 pm

1 stop6h 41m

Ontario

sáb. 1/31

1:10 pm-9:28 pm

1 stop6h 18m

$300

San AntonioOntario

SAT - ONT

SATONT

San Antonio

vie. 1/9

10:13 am-11:56 pm

1 stop15h 43m

Ontario

lun. 1/12

3:46 pm-11:52 pm

2 stops30h 06m

$304

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 23 results
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Compare providers for flights from San Antonio to Ontario

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 San Antonio to Ontario in December.
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
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice 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 San Antonio-Ontario flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on San Antonio-Ontario flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from San Antonio-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Antonio-Ontario flights, Cheapflights users trust CheapOair the most. CheapOair 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 San Antonio-Ontario 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 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 December 5, 2025.

Booking 11 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, September is the cheapest month in which you can book a flight from San Antonio to Ontario (average of $60). Flying from San Antonio to Ontario in March is currently the most expensive (average of $104). 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 diciembre 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 32% on airfare.

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 diciembre 12, 2025.
Read through reviews of airlines operating flights from San Antonio to Ontario, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

7.9

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

7.9

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
8,008 reviews
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

7.9

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,095 reviews
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

7.9

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,050 reviews
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

7.9

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,084 reviews
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

7.9

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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.

  • How long is the flight from San Antonio to Ontario?

    Departing from San Antonio to Ontario will take you 9h 19m. San Antonio and Ontario are separated by a distance of 1163 mi.

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

    Our cheapest airline available from San Antonio to Ontario is Spirit Airlines. Our recent data shows that you can find tickets from as low as $74 on this airline. Additional options worth looking into are Delta and Frontier, starting at $110 and $115 round-trip. Users have found that Spirit Airlines is 77% cheaper than the other options available to this destination.

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

    $72 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and American Airlines, with prices starting from $92 and $118, 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, September is the cheapest month in which you can book a flight from San Antonio to Ontario (average of $60). Flying from San Antonio to Ontario in March is currently the most expensive (average of $104). 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 diciembre 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$111Average$147FlexibilityNo cancel feeOn-time65%
FrontierCheapest$115Average$227FlexibilityNo cancel feeOn-time62%
DeltaCheapest$158Average$256FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$236Average$372FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$295Average$386FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$301Average$446FlexibilityNo cancel feeOn-time69%

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