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Cheap flights from Ontario to San Antonio from $70

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Antonio departing on 7/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Ontario to San Antonio

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
1:38 pm - 8:37 pm
ONT
-
SAT
4h 59m
1 stop
Frontier Logo
9:32 pm - 8:03 am
SAT
-
ONT
12h 31m
1 stop
$190Frontier
Wed, Jul 8 - Tue, Jul 14
Frontier Logo
11:47 am - 8:37 pm
ONT
-
SAT
6h 50m
1 stop
Frontier Logo
9:32 pm - 8:03 am
SAT
-
ONT
12h 31m
1 stop
$196Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
8:58 am - 8:37 pm
ONT
-
SAT
9h 39m
2 stops
Frontier Logo
9:32 pm - 3:14 pm
SAT
-
ONT
19h 42m
1 stop
$226Frontier
Wed, Jul 8 - Tue, Jul 14
Frontier Logo
3:34 pm - 8:11 pm
ONT
-
SAT
26h 37m
1 stop
Frontier Logo
9:32 pm - 3:54 pm
SAT
-
ONT
20h 22m
1 stop
$228Frontier
Wed, Jul 1 - Wed, Jul 8
Frontier Logo
6:00 am - 6:44 pm
ONT
-
SAT
10h 44m
1 stop
Frontier Logo
7:39 pm - 11:50 pm
SAT
-
ONT
6h 11m
1 stop
$230Frontier
Tue, Jul 21 - Wed, Jul 29
Frontier Logo
6:00 am - 6:56 pm
ONT
-
SAT
10h 56m
1 stop
Frontier Logo
9:32 pm - 8:03 am
SAT
-
ONT
12h 31m
1 stop
$237Frontier
Tue, Jun 30 - Tue, Jul 7
Frontier Logo
3:34 pm - 8:11 pm
ONT
-
SAT
26h 37m
1 stop
Frontier Logo
8:56 pm - 7:48 pm
SAT
-
ONT
24h 52m
1 stop
$240Frontier
Wed, Aug 19 - Wed, Aug 26
Frontier Logo
6:00 am - 6:56 pm
ONT
-
SAT
10h 56m
1 stop
Frontier Logo
8:56 pm - 3:08 pm
SAT
-
ONT
20h 12m
1 stop
$242Frontier
Sat, Jun 27 - Tue, Jun 30
Frontier Logo
10:49 am - 6:44 pm
ONT
-
SAT
5h 55m
1 stop
Frontier Logo
7:39 pm - 11:50 pm
SAT
-
ONT
6h 11m
1 stop
$244Frontier
Wed, Aug 12 - Thu, Aug 13
Frontier Logo
6:00 am - 6:44 pm
ONT
-
SAT
10h 44m
1 stop
Frontier Logo
7:39 pm - 10:04 am
SAT
-
ONT
16h 25m
1 stop
$246Frontier
Wed, Jul 22 - Sat, Jul 25

Frontier flights from Ontario to San Antonio

Our best Frontier deals on Ontario to San Antonio flight tickets
Frontier
Jul 8
ONT1:38 pmOntario
4h 59m
1 stop
SAT8:37 pmSan Antonio
Jul 14
SAT9:32 pmSan Antonio
12h 31m
1 stop
ONT8:03 amOntario
$190
Frontier
Aug 6
ONT11:47 amOntario
6h 50m
1 stop
SAT8:37 pmSan Antonio
Aug 10
SAT9:32 pmSan Antonio
12h 31m
1 stop
ONT8:03 amOntario
$196
Frontier
Jul 8
ONT8:58 amOntario
9h 39m
2 stops
SAT8:37 pmSan Antonio
Jul 14
SAT9:32 pmSan Antonio
19h 42m
1 stop
ONT3:14 pmOntario
$226

momondo 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, momondo users made 832,500 searches. Data last updated June 4, 2026.
Use the filters below to find and compare flights from Ontario to San Antonio that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 7/8

1:38 pm-8:37 pm

1 stop4h 59m

San Antonio

Tue 7/14

9:32 pm-8:03 am

1 stop12h 31m

$190

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 8/6

11:47 am-8:37 pm

1 stop6h 50m

San Antonio

Mon 8/10

9:32 pm-8:03 am

1 stop12h 31m

$196

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 7/8

8:58 am-8:37 pm

2 stops9h 39m

San Antonio

Tue 7/14

9:32 pm-3:14 pm

1 stop19h 42m

$226

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 7/1

3:34 pm-8:11 pm

1 stop26h 37m

San Antonio

Wed 7/8

9:32 pm-3:54 pm

1 stop20h 22m

$228

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 7/21

6:00 am-6:44 pm

1 stop10h 44m

San Antonio

Wed 7/29

7:39 pm-11:50 pm

1 stop6h 11m

$230

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Tue 6/30

6:00 am-6:56 pm

1 stop10h 56m

San Antonio

Tue 7/7

9:32 pm-8:03 am

1 stop12h 31m

$237

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 8/19

3:34 pm-8:11 pm

1 stop26h 37m

San Antonio

Wed 8/26

8:56 pm-7:48 pm

1 stop24h 52m

$240

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 6/27

6:00 am-6:56 pm

1 stop10h 56m

San Antonio

Tue 6/30

8:56 pm-3:08 pm

1 stop20h 12m

$242
Quickest round-trip

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 8/12

10:49 am-6:44 pm

1 stop5h 55m

San Antonio

Thu 8/13

7:39 pm-11:50 pm

1 stop6h 11m

$244

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 7/22

6:00 am-6:44 pm

1 stop10h 44m

San Antonio

Sat 7/25

7:39 pm-10:04 am

1 stop16h 25m

$246

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Antonio from

How to get the cheapest flight ticket from Ontario to San Antonio

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ontario and San Antonio?

What is the cheapest month to fly to San Antonio?

If you aren’t able to travel during the month of October, then book flights to San Antonio from Ontario during January instead. Flights to San Antonio in January, while not as cheap as those in October, still average around $304.

What is the cheapest day to depart on your flight to San Antonio?

The cheapest day to depart on your flight to San Antonio is on a Saturday when prices can be found for as low as $318. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Sunday is $447.

What is the cheapest time of day to depart on your flight to San Antonio?

According to our data, the cheapest time of day to fly to San Antonio is in the evening. momondo users have found flights departing from Ontario to San Antonio in the evening for as low as $222. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to San Antonio are more costly in the morning, with an average ticket price of $372. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to San Antonio from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $336 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from Ontario for as low as $234 on momondo.

How have Ontario to San Antonio flight prices changed over time?

As of June 2026, prices for Ontario to San Antonio flights are approximately 0% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to San Antonio

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to San Antonio according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to San Antonio (ONT to SAT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to San Antonio

Fastest flight time

4h 48m

Direct flights

None
The fastest flight from Ontario to San Antonio takes 4h 48m
There are no direct flights from Ontario to San Antonio. There are no popular flight routes from Ontario to San Antonio.
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Frequently asked questions about flying from Ontario to San Antonio

  • How far is Ontario to San Antonio by plane?

    Ontario and San Antonio are 1167.5 mi apart from one another. A reasonable flight in good conditions will take 4h 48m.

  • When did momondo last update prices for flights from Ontario Airport to San Antonio Airport?

    Prices for flights from Ontario Airport to San Antonio Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to San Antonio Airport?

  • How old do you have to be to fly from Ontario Airport to San Antonio Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to San Antonio Airport.

  • What documentation or ID do you need to fly to San Antonio Airport?

    The necessary travel and health documents for your San Antonio Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to San Antonio?

Best airlines flying from Ontario to San Antonio

Compare and see reviews for airlines that fly from Ontario to San Antonio with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $120Free CancellationRating
5.6
2,914 reviews
Search Frontier flights
American AirlinesPriceFrom $190Free CancellationRating
7.1
11,641 reviews
Search American Airlines flights
DeltaPriceFrom $221Free CancellationRating
7.8
8,395 reviews
Search Delta flights
SouthwestPriceFrom $256Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
United AirlinesPriceFrom $270Free CancellationRating
7.4
9,774 reviews
Search United Airlines flights

  • Southwest Flights From Ontario to San Antonio

    Southwest flies from Ontario to San Antonio around 2 times per week, with 4,256 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Ontario to San Antonio in the last 72 hours was $256 (round-trip), much lower than the average airfare cost of $397 for Southwest flights on this route.

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville
Pleasanton
Boerne
Schertz

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to San Antonio?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to San Antonio. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to San Antonio with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to San Antonio flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to San Antonio?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to San Antonio.

I’m not ready to book a flight from Ontario to San Antonio right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to San Antonio from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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