HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$71+ 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 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ONT
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Antonio to Ontario 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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 16, 2025.

Round-trip from

$143
(Priceline)

One-way from

$71
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$288
From San Antonio to Ontario
Search Deals
One-way flight from San Antonio to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 16, 2025.

This Priceline deal was found by Cheapflights users on 9/13. 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 10/168:26 pmSAT - ONT
1 stop5h 24mFrontier
Wed 10/226:53 amONT - SAT
1 stop6h 21mFrontier
Deal found 9/13$143
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/62:01 pmSAT - ONT
1 stop8h 55mFrontier
Fri 10/106:53 amONT - SAT
1 stop10h 42mFrontier
Deal found 9/15$144
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/267:25 pmSAT - ONT
1 stop26h 29mFrontier
Sun 9/287:30 pmONT - SAT
1 stop15h 46mFrontier
Deal found 9/14$145
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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.
Mon 10/138:20 pmSAT - ONT
1 stop5h 30mFrontier
Thu 10/166:05 amONT - SAT
1 stop5h 14mFrontier
Deal found 9/14$148
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/272:04 pmSAT - ONT
1 stop10h 01mFrontier
Thu 10/3010:05 amONT - SAT
1 stop9h 56mFrontier
Deal found 9/15$149
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/298:20 pmSAT - ONT
1 stop25h 34mFrontier
Fri 10/38:59 pmONT - SAT
1 stop15h 28mFrontier
Deal found 9/14$150
This Booking.com deal was found by Cheapflights users on 9/16. 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.
Thu 9/258:20 pmSAT - ONT
1 stop25h 34mFrontier
Sun 9/288:59 pmONT - SAT
1 stop20h 16mFrontier
Deal found 9/16$151
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/248:26 pmSAT - ONT
1 stop5h 24mFrontier
Mon 10/276:05 amONT - SAT
1 stop5h 14mFrontier
Deal found 9/15$153
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/312:41 pmSAT - ONT
1 stop9h 13mFrontier
Mon 10/66:00 amONT - SAT
1 stop5h 16mFrontier
Deal found 9/14$154
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:20 pmSAT - ONT
1 stop25h 34mFrontier
Thu 9/256:00 amONT - SAT
1 stop5h 23mFrontier
Deal found 9/15$157
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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.
Fri 10/108:21 pmSAT - ONT
1 stop5h 29mFrontier
Sun 10/126:05 amONT - SAT
1 stop5h 14mFrontier
Deal found 9/13$165

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 September 16, 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

Sat 11/8

3:12 pm-11:50 pm

1 stop10h 38m

Ontario

Sat 11/15

6:53 am-2:17 pm

1 stop5h 24m

$143

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Sun 11/9

2:04 pm-7:17 am

1 stop19h 13m

Ontario

Fri 11/14

6:53 am-7:30 pm

1 stop10h 37m

$143

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Sun 9/28

9:33 pm-7:17 am

1 stop11h 44m

Ontario

Thu 10/2

9:16 am-8:48 pm

1 stop9h 32m

$144

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Mon 10/27

2:04 pm-10:05 pm

1 stop10h 01m

Ontario

Thu 10/30

6:53 am-7:48 pm

1 stop10h 55m

$144

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Thu 10/2

8:20 pm-7:54 pm

1 stop25h 34m

Ontario

Sun 10/5

8:59 pm-7:15 pm

1 stop20h 16m

$144

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Thu 9/25

9:33 pm-7:17 am

1 stop11h 44m

Ontario

Sat 9/27

8:00 am-3:50 pm

1 stop5h 50m

$144

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Fri 9/26

7:25 pm-7:54 pm

1 stop26h 29m

Ontario

Fri 10/3

8:59 pm-2:27 pm

1 stop15h 28m

$145

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Thu 10/23

12:09 pm-11:50 pm

1 stop13h 41m

Ontario

Mon 10/27

6:05 am-1:19 pm

1 stop5h 14m

$148

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Fri 10/17

8:20 pm-11:50 pm

1 stop5h 30m

Ontario

Wed 10/22

6:53 am-3:14 pm

1 stop6h 21m

$148

San AntonioOntario

SAT - ONT

SATONT

San Antonio

Thu 10/30

8:43 pm-11:10 am

1 stop16h 27m

Ontario

Sun 11/16

6:53 am-7:30 pm

1 stop10h 37m

$148

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 21 results
1
2
3

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 September 12, 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 $327). 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 September 16, 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.

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 September 16, 2025.
Read through reviews of airlines operating flights from San Antonio to Ontario, such as Southwest, Delta, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

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
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

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
8.0
Very good
7,957 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

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
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

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.
Spirit Airlines
6.3
Okay
8,019 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

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
3,174 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

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 10h 38m. 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 $106 on this airline. Additional options worth looking into are Frontier and Delta, starting at $115 and $158 round-trip. Users have found that Spirit Airlines is 68% cheaper than the other options available to this destination.

  • 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 $327). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Antonio to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to Las Vegas flights
Dallas/Fort Worth to Los Angeles flights
Hobby to Las Vegas flights
George Bush Intcntl to Las Vegas flights
Dallas/Fort Worth to San Francisco flights
Austin to Las Vegas flights
Love Field to Las Vegas flights
Hobby to Los Angeles flights
Dallas/Fort Worth to San Diego flights
George Bush Intcntl to Los Angeles flights
Austin to Los Angeles flights
Dallas/Fort Worth to Ontario flights
Hobby to Ontario flights
Dallas/Fort Worth to Santa Ana flights
Hobby to San Francisco flights
George Bush Intcntl to Ontario flights
San Antonio to Las Vegas flights
Austin to San Francisco flights
George Bush Intcntl to San Francisco flights
Love Field to Los Angeles flights
Dallas/Fort Worth to Burbank flights
Hobby to San Diego flights
Dallas/Fort Worth to San Jose flights
San Antonio to Los Angeles flights
Dallas/Fort Worth to Sacramento flights
George Bush Intcntl to San Diego flights
Austin to San Diego flights
Hobby to Santa Ana flights
El Paso to Las Vegas flights
Love Field to San Francisco flights
George Bush Intcntl to Santa Ana flights
Dallas/Fort Worth to Oakland flights
Dallas/Fort Worth to Reno flights
San Antonio to San Francisco flights
Austin to Ontario flights
Austin to Santa Ana flights
Hobby to Sacramento flights
Hobby to Burbank flights
Hobby to San Jose flights
Love Field to San Diego flights
Dallas/Fort Worth to Palm Springs flights
George Bush Intcntl to Sacramento flights
George Bush Intcntl to Burbank flights
El Paso to Los Angeles flights
San Antonio to Burbank flights
George Bush Intcntl to San Jose flights
Austin to San Jose flights
San Antonio to San Diego flights
Love Field to Santa Ana flights

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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$106Average$165FlexibilityNo cancel feeOn-time65%
FrontierCheapest$115Average$226FlexibilityNo cancel feeOn-time62%
DeltaCheapest$158Average$256FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$236Average$374FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$295Average$386FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$301Average$396FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.