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Cheap flights from Ontario to San Antonio from $62

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 2/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
7:15 am - 9:30 am
ONT
-
SAT
24h 15m1 stop
Frontier Logo
9:36 pm - 1:37 pm
SAT
-
ONT
18h 01m1 stop
$146Frontier
Sat, Jan 17 - Mon, Jan 19
Frontier Logo
7:15 am - 9:30 am
ONT
-
SAT
24h 15m1 stop
Frontier Logo
8:53 pm - 7:37 am
SAT
-
ONT
12h 44m1 stop
$148Frontier
Wed, Jan 14 - Sun, Jan 18
Frontier Logo
6:20 am - 7:33 pm
ONT
-
SAT
11h 13m1 stop
Frontier Logo
8:24 pm - 12:20 am
SAT
-
ONT
5h 56m1 stop
$155Frontier
Mon, Feb 2 - Mon, Feb 9
Frontier Logo
3:07 pm - 1:11 pm
ONT
-
SAT
20h 04m1 stop
Frontier Logo
9:59 pm - 1:34 pm
SAT
-
ONT
17h 35m1 stop
$156Frontier
Wed, Jan 28 - Fri, Jan 30
Frontier Logo
7:30 am - 4:17 pm
ONT
-
SAT
6h 47m1 stop
Frontier Logo
3:50 pm - 9:34 pm
SAT
-
ONT
31h 44m2 stops
$160Frontier
Wed, Feb 25 - Mon, Mar 2
Frontier Logo
3:07 pm - 1:11 pm
ONT
-
SAT
20h 04m1 stop
Frontier Logo
9:41 pm - 3:07 pm
SAT
-
ONT
19h 26m2 stops
$161Frontier
Wed, Jan 21 - Mon, Jan 26
Frontier Logo
9:10 pm - 4:17 pm
ONT
-
SAT
17h 07m2 stops
Frontier Logo
9:36 pm - 1:37 pm
SAT
-
ONT
18h 01m1 stop
$164Frontier
Sat, Jan 17 - Mon, Jan 19
Frontier Logo
6:05 am - 7:25 pm
ONT
-
SAT
11h 20m1 stop
Frontier Logo
7:56 pm - 11:59 pm
SAT
-
ONT
6h 03m1 stop
$176Frontier
Thu, Feb 26 - Sat, Feb 28
Frontier Logo
6:05 am - 7:25 pm
ONT
-
SAT
11h 20m1 stop
Frontier Logo
7:56 pm - 7:59 am
SAT
-
ONT
14h 03m1 stop
$177Frontier
Thu, Feb 26 - Sat, Feb 28
Frontier Logo
7:00 am - 3:00 pm
ONT
-
SAT
6h 00m1 stop
Frontier Logo
11:55 am - 4:20 pm
SAT
-
ONT
6h 25m1 stop
$182Frontier
Wed, Jan 7 - Thu, Jan 8

Frontier flights from Ontario to San Antonio

Our best Frontier deals on Ontario to San Antonio flight tickets
Frontier
Jan 17
ONT7:15 amOntario
24h 15m
1 stop
SAT9:30 amSan Antonio
Jan 19
SAT9:36 pmSan Antonio
18h 01m
1 stop
ONT1:37 pmOntario
$146
Find similar
Frontier
Jan 14
ONT7:15 amOntario
24h 15m
1 stop
SAT9:30 amSan Antonio
Jan 18
SAT8:53 pmSan Antonio
12h 44m
1 stop
ONT7:37 amOntario
$148
Find similar
Frontier
Feb 2
ONT6:20 amOntario
11h 13m
1 stop
SAT7:33 pmSan Antonio
Feb 9
SAT8:24 pmSan Antonio
5h 56m
1 stop
ONT12:20 amOntario
$155
Find similar

United Airlines flights from Ontario to San Antonio

Our best United Airlines deals on Ontario to San Antonio flight tickets
United Airlines
Dec 17
ONT6:00 amOntario
7h 30m
1 stop
SAT3:30 pmSan Antonio
Dec 24
SAT4:05 pmSan Antonio
7h 47m
1 stop
ONT9:52 pmOntario
$574
Find similar
United Airlines
Dec 17
ONT5:05 amOntario
10h 42m
2 stops
SAT5:47 pmSan Antonio
Dec 24
SAT4:05 pmSan Antonio
7h 47m
1 stop
ONT9:52 pmOntario
$579
Find similar
United Airlines
Dec 25
ONT5:05 amOntario
12h 36m
2 stops
SAT7:41 pmSan Antonio
Jan 2
SAT2:13 pmSan Antonio
8h 54m
2 stops
ONT9:07 pmOntario
$584
Find similar

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 December 11, 2025.
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

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 1/17

7:15 am-9:30 am

1 stop24h 15m

San Antonio

Mon 1/19

9:36 pm-1:37 pm

1 stop18h 01m

$146

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 1/14

7:15 am-9:30 am

1 stop24h 15m

San Antonio

Sun 1/18

8:53 pm-7:37 am

1 stop12h 44m

$148

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Mon 2/2

6:20 am-7:33 pm

1 stop11h 13m

San Antonio

Mon 2/9

8:24 pm-12:20 am

1 stop5h 56m

$155

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 1/28

3:07 pm-1:11 pm

1 stop20h 04m

San Antonio

Fri 1/30

9:59 pm-1:34 pm

1 stop17h 35m

$156

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 2/25

7:30 am-4:17 pm

1 stop6h 47m

San Antonio

Mon 3/2

3:50 pm-9:34 pm

2 stops31h 44m

$160

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 1/21

3:07 pm-1:11 pm

1 stop20h 04m

San Antonio

Mon 1/26

9:41 pm-3:07 pm

2 stops19h 26m

$161

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 1/17

9:10 pm-4:17 pm

2 stops17h 07m

San Antonio

Mon 1/19

9:36 pm-1:37 pm

1 stop18h 01m

$164

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 2/26

6:05 am-7:25 pm

1 stop11h 20m

San Antonio

Sat 2/28

7:56 pm-11:59 pm

1 stop6h 03m

$176

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 2/26

6:05 am-7:25 pm

1 stop11h 20m

San Antonio

Sat 2/28

7:56 pm-7:59 am

1 stop14h 03m

$177

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Wed 1/7

7:00 am-3:00 pm

1 stop6h 00m

San Antonio

Thu 1/8

11:55 am-4:20 pm

1 stop6h 25m

$182

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 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 $277.

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 Wednesday when prices can be found for as low as $221. 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 Monday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Monday is $273.

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 at noon. momondo users have found flights departing from Ontario to San Antonio at noon for as low as $167. 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 afternoon, with an average ticket price of $261. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight 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 $332 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 $268 on momondo.

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

As of December 2025, prices for Ontario to San Antonio flights are approximately 49% 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 41m

Direct flights

None
The fastest flight from Ontario to San Antonio takes 4h 41m
There are no direct flights from Ontario to San Antonio. There are no popular flight routes from Ontario to San Antonio.
Search flight deals

  • 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 41m.

  • 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 $110Free CancellationRating
5.8
3,084 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $118Free CancellationRating
6.3
8,175 reviews
Search Spirit Airlines flights
DeltaPriceFrom $200Free CancellationRating
7.9
8,009 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,048 reviews
Search American Airlines flights
SouthwestPriceFrom $256Free CancellationRating
7.9
4,252 reviews
Search Southwest flights
United AirlinesPriceFrom $270Free CancellationRating
7.4
9,095 reviews
Search United Airlines flights

Traveling to a place near San Antonio?

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

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.

An easier way to manage your San Antonio trip

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