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Cheap flights from Ontario to San Antonio from $71

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 10/2. 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
0 bags

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Find the cheapest flights from Ontario to San Antonio

Cheap round-trip flights

Frontier Logo
8:59 pm - 6:30 pmONT-SAT
19h 31m1 stop
Frontier Logo
8:20 pm - 10:13 pmSAT-ONT
27h 53m1 stop
$143Frontier
Find Deal
Thu, Oct 2 - Sun, Oct 5
Frontier Logo
6:00 am - 1:23 pmONT-SAT
5h 23m1 stop
Frontier Logo
9:33 pm - 7:17 amSAT-ONT
11h 44m1 stop
$144Frontier
Find Deal
Thu, Oct 2 - Sun, Oct 5
Frontier Logo
11:53 am - 4:37 pmONT-SAT
26h 44m1 stop
Frontier Logo
9:52 pm - 7:47 amSAT-ONT
11h 55m1 stop
$145Frontier
Find Deal
Fri, Oct 24 - Sun, Oct 26
Frontier Logo
7:04 am - 11:14 amONT-SAT
26h 10m1 stop
Frontier Logo
8:20 pm - 11:50 pmSAT-ONT
5h 30m1 stop
$148Frontier
Find Deal
Sat, Oct 11 - Mon, Oct 13
Frontier Logo
7:04 am - 4:37 pmONT-SAT
7h 33m1 stop
Frontier Logo
3:59 pm - 11:50 pmSAT-ONT
9h 51m1 stop
$149Frontier
Find Deal
Sat, Oct 11 - Tue, Oct 14
Frontier Logo
8:59 pm - 7:15 pmONT-SAT
20h 16m1 stop
Frontier Logo
8:20 pm - 7:54 pmSAT-ONT
25h 34m1 stop
$150Frontier
Find Deal
Sun, Sep 28 - Thu, Oct 2
Frontier Logo
10:28 pm - 3:50 pmONT-SAT
15h 22m1 stop
Frontier Logo
2:01 pm - 8:56 pmSAT-ONT
8h 55m1 stop
$151Frontier
Find Deal
Fri, Sep 26 - Mon, Sep 29
Frontier Logo
6:05 am - 1:19 pmONT-SAT
5h 14m1 stop
Frontier Logo
2:04 pm - 10:05 pmSAT-ONT
10h 01m1 stop
$152Frontier
Find Deal
Thu, Oct 16 - Mon, Oct 20
Multiple Airlines Logo
6:53 am - 2:17 pmONT-SAT
5h 24m1 stop
Multiple Airlines Logo
7:00 am - 8:42 pmSAT-ONT
15h 42m1 stop
$186Multiple Airlines
Find Deal
Sat, Nov 1 - Tue, Nov 4
Multiple Airlines Logo
10:43 pm - 3:35 pmONT-SAT
14h 52m1 stop
Multiple Airlines Logo
6:23 pm - 8:42 pmSAT-ONT
28h 19m1 stop
$197Multiple Airlines
Find Deal
Fri, Nov 7 - Tue, Nov 11

Frontier flights from Ontario to San Antonio

Our best Frontier deals on Ontario to San Antonio flight tickets
Frontier
Sep 24
ONT8:00 amOntario
27h 23m
1 stop
SAT1:23 pmSan Antonio
Sep 28
SAT8:20 pmSan Antonio
13h 33m
1 stop
ONT7:53 amOntario
$143
Find similar
Frontier
Oct 2
ONT6:00 amOntario
5h 23m
1 stop
SAT1:23 pmSan Antonio
Oct 5
SAT9:33 pmSan Antonio
11h 44m
1 stop
ONT7:17 amOntario
$144
Find similar
Frontier
Oct 24
ONT11:53 amOntario
26h 44m
1 stop
SAT4:37 pmSan Antonio
Oct 26
SAT9:52 pmSan Antonio
11h 55m
1 stop
ONT7:47 amOntario
$145
Find similar

United Airlines flights from Ontario to San Antonio

Our best United Airlines deals on Ontario to San Antonio flight tickets
United Airlines
Sep 29
ONT5:05 amOntario
10h 55m
2 stops
SAT6:00 pmSan Antonio
Oct 3
SAT9:47 amSan Antonio
9h 36m
2 stops
ONT5:23 pmOntario
$534
Find similar
United Airlines
Sep 29
ONT1:53 pmOntario
8h 16m
1 stop
SAT12:09 amSan Antonio
Oct 1
SAT4:21 pmSan Antonio
7h 03m
1 stop
ONT9:24 pmOntario
$547
Find similar
United Airlines
Sep 29
ONT1:53 pmOntario
8h 16m
1 stop
SAT12:09 amSan Antonio
Oct 1
SAT6:45 amSan Antonio
12h 38m
2 stops
ONT5:23 pmOntario
$552
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 September 16, 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

Thu 10/2

8:59 pm-6:30 pm

1 stop19h 31m

San Antonio

Sun 10/5

8:20 pm-10:13 pm

1 stop27h 53m

$143

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 10/2

6:00 am-1:23 pm

1 stop5h 23m

San Antonio

Sun 10/5

9:33 pm-7:17 am

1 stop11h 44m

$144

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 10/24

11:53 am-4:37 pm

1 stop26h 44m

San Antonio

Sun 10/26

9:52 pm-7:47 am

1 stop11h 55m

$145

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 10/11

7:04 am-11:14 am

1 stop26h 10m

San Antonio

Mon 10/13

8:20 pm-11:50 pm

1 stop5h 30m

$148

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 10/11

7:04 am-4:37 pm

1 stop7h 33m

San Antonio

Tue 10/14

3:59 pm-11:50 pm

1 stop9h 51m

$149

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sun 9/28

8:59 pm-7:15 pm

1 stop20h 16m

San Antonio

Thu 10/2

8:20 pm-7:54 pm

1 stop25h 34m

$150

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 9/26

10:28 pm-3:50 pm

1 stop15h 22m

San Antonio

Mon 9/29

2:01 pm-8:56 pm

1 stop8h 55m

$151

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Thu 10/16

6:05 am-1:19 pm

1 stop5h 14m

San Antonio

Mon 10/20

2:04 pm-10:05 pm

1 stop10h 01m

$152

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Sat 11/1

6:53 am-2:17 pm

1 stop5h 24m

San Antonio

Tue 11/4

7:00 am-8:42 pm

1 stop15h 42m

$186

OntarioSan Antonio

ONT - SAT

ONTSAT

Ontario

Fri 11/7

10:43 pm-3:35 pm

1 stop14h 52m

San Antonio

Tue 11/11

6:23 pm-8:42 pm

1 stop28h 19m

$197

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 January, then book flights to San Antonio from Ontario during August instead. Flights to San Antonio in August, while not as cheap as those in January, still average around $312.

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 $226. 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 $295.

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 $180. 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 $270. 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 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 $348 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 $265 on momondo.

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

As of September 2025, prices for Ontario to San Antonio flights are approximately 125% 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

Direct flights

None
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 5h 14m.

  • 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
Spirit AirlinesPriceFrom $99Free CancellationRating
6.3
8,019 reviews
Search Spirit Airlines flights
FrontierPriceFrom $117Free CancellationRating
5.8
3,174 reviews
Search Frontier flights
DeltaPriceFrom $200Free CancellationRating
7.9
7,957 reviews
Search Delta flights
American AirlinesPriceFrom $232Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $275Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $304Free CancellationRating
7.4
8,924 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.

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