$59+ 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAT
Feb 20 — Feb 271
1 adult, Economy
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Find cheap flights from Ontario to San Antonio 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.Cheap flight deals from Ontario to San Antonio
Cheapest flights from Ontario to San AntonioExplore 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 January 21, 2026.
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 January 21, 2026.
This CheapOair deal was found by Cheapflights users on 1/21. 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.
Wed 2/187:30 am
ONT
- SAT
1 stop7h 45m
Frontier
Wed 2/256:12 pm
SAT
- ONT
1 stop17h 22m
Frontier
Deal found 1/21![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Thu 2/267:22 pm
ONT
- SAT
1 stop12h 36m
Frontier
Sat 2/287:56 pm
SAT
- ONT
1 stop14h 03m
Frontier
Deal found 1/20![Frontier logo]()
$152
This Expedia deal was found by Cheapflights users on 1/19. 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.
Tue 2/108:36 am
ONT
- SAT
1 stop5h 41m
Frontier
Sat 2/147:56 pm
SAT
- ONT
1 stop6h 03m
Frontier
Deal found 1/19![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 3/66:15 am
ONT
- SAT
1 stop24h 51m
Frontier
Tue 3/106:45 am
SAT
- ONT
1 stop19h 14m
Frontier
Deal found 1/19![Frontier logo]()
$161
This Frontier deal was found by Cheapflights users on 1/21. 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.
Wed 2/118:10 am
ONT
- SAT
1 stop6h 07m
Frontier
Mon 2/168:22 pm
SAT
- ONT
1 stop5h 37m
Frontier
Deal found 1/21![Frontier logo]()
$173
This CheapOair deal was found by Cheapflights users on 1/20. 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.
Wed 2/118:10 am
ONT
- SAT
1 stop6h 07m
Frontier
Thu 2/198:25 pm
SAT
- ONT
1 stop5h 34m
Frontier
Deal found 1/20![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 3/96:15 am
ONT
- SAT
1 stop16h 02m
Frontier
Wed 3/116:45 am
SAT
- ONT
1 stop19h 14m
Frontier
Deal found 1/19![Frontier logo]()
$176
This CheapOair deal was found by Cheapflights users on 1/20. 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.
Thu 2/126:05 am
ONT
- SAT
1 stop11h 25m
Frontier
Sat 2/147:56 pm
SAT
- ONT
1 stop6h 03m
Frontier
Deal found 1/20![Frontier logo]()
$180
This CheapOair deal was found by Cheapflights users on 1/19. 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.
Thu 2/56:20 am
ONT
- SAT
1 stop11h 13m
Frontier
Tue 2/105:12 pm
SAT
- ONT
1 stop6h 22m
Frontier
Deal found 1/19![Frontier logo]()
$181
This Expedia deal was found by Cheapflights users on 1/19. 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.
Wed 2/253:22 pm
ONT
- SAT
1 stop22h 25m
Frontier
Sun 3/17:07 pm
SAT
- ONT
1 stop6h 52m
Frontier
Deal found 1/19![Frontier logo]()
$189
This Flightnetwork deal was found by Cheapflights users on 1/20. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/58:48 pm
ONT
- SAT
1 stop13h 37m
Frontier
Sat 2/147:56 pm
SAT
- ONT
1 stop6h 03m
Frontier
Deal found 1/20![Frontier logo]()
$192
Find 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 January 21, 2026.
Most accurate provider | Mytrip 3 stars |
|---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $128 (CheapOair) |
One-way from | $59 (Trip.com) |
Popular in | March |
Cheapest in | October |
Average price | $302 |
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 January 21, 2026.
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 2/14
6:00 am-7:01 pm
1 stop11h 01m
San Antonio
Sat 2/21
7:56 pm-11:59 pm
1 stop6h 03m
$175
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Sat 2/21
6:00 am-7:01 pm
1 stop11h 01m
San Antonio
Mon 2/23
8:22 pm-11:59 pm
1 stop5h 37m
$175
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Thu 3/12
6:15 am-9:06 am
1 stop24h 51m
San Antonio
Tue 3/17
6:45 am-11:59 pm
1 stop19h 14m
$245
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Wed 4/1
6:20 am-12:19 am
1 stop15h 59m
San Antonio
Mon 4/6
11:38 am-12:09 pm
1 stop26h 31m
$246
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Fri 2/20
1:45 pm-8:56 pm
1 stop5h 11m
San Antonio
Sun 2/22
5:58 pm-9:59 pm
1 stop6h 01m
$253
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Wed 4/15
6:05 am-3:46 pm
1 stop7h 41m
San Antonio
Tue 4/21
6:02 pm-9:50 pm
1 stop5h 48m
$253
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Tue 3/17
6:15 am-12:17 am
1 stop16h 02m
San Antonio
Sat 3/21
6:45 am-11:59 pm
1 stop19h 14m
$254
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Thu 1/29
8:48 pm-12:25 pm
1 stop13h 37m
San Antonio
Sun 2/1
1:15 pm-12:10 pm
1 stop24h 55m
$256
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Sat 4/11
1:20 pm-9:27 pm
1 stop6h 07m
San Antonio
Wed 4/15
5:20 am-11:29 am
1 stop8h 09m
$257
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Fri 4/10
5:09 pm-12:16 am
1 stop5h 07m
San Antonio
Fri 4/17
12:21 pm-8:58 pm
1 stop10h 37m
$257
Showing 1-10 of 20 results
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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Ontario-San Antonio flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Ontario-San Antonio flight deals on Cheapflights vs. Mytrip >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 Mytrip the most. Mytrip 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
Prices
More
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 January 16, 2026.
The best time to book flights from Ontario to San Antonio is 64 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, September is the cheapest month in which you can book a flight from Ontario to San Antonio (average of $58). Flying from Ontario to San Antonio in July is currently the most expensive (average of $99). 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.
How much does it cost to fly round-trip from Ontario to San Antonio?
What’s the top layover airport for flights from Ontario to San Antonio?
Share of 1-stop round-trip flights from Ontario to San Antonio chosen by Cheapflights users in the past 12 months, using the same layover each way.
Phoenix (PHX) – chosen by Cheapflights users on 60% of 1-stop itineraries from Ontario to San Antonio on Cheapflights.
What’s the cheapest layover airport for flights from Ontario to San Antonio?
Average round-trip fare for 1-stop flights from Ontario to San Antonio, 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 $130.
What’s the fastest layover option from Ontario to San Antonio?
Shortest average travel time for 1-stop one-way flights from Ontario to San Antonio, 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: 4h 25m.
Which airport typically offers the quickest layover for flights from Ontario to San Antonio?
Average layover duration for 1-stop one-way flights from Ontario to San Antonio, 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 0h 41m.
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 January 21, 2026.
See what other customers who have flown with Southwest, United Airlines, and American Airlines from Ontario to San Antonio have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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.
Traveling to a place near San Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Ontario to San Antonio
See prices for flight routes from nearby airports that may be better suited for you.
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 January 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$110 | Average$232 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$118 | Average$170 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$200 | Average$369 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$236 | Average$386 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$383 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$270 | Average$380 | FlexibilityNo cancel fee | On-time69% |