ONT - SAT

$64 Find Cheap Flights from Ontario to San Antonio

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to San Antonio departing on 12/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to San Antonio

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Antonio.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Antonio.
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Everything you should know

Cheapest round-trip
$125
Overall average: $371
Frontier
Mon 2/2Mon 2/9
ONT - SAT • 1 stop
Cheapest one-way
$52
Typical prices: $109-$373
Frontier
Wed 12/10
ONT - SAT • 1 stop
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 26% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 32% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to San Antonio (ONT-SAT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to San Antonio that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to San Antonio

Mon, Feb 2 - Mon, Feb 9
Frontier Logo
1:05 pm - 8:46 pm
ONT
-
SAT
5h 41m1 stop
Frontier Logo
9:41 pm - 9:17 pm
SAT
-
ONT
25h 36m1 stop
$125Frontier
Thu, Jan 22 - Mon, Jan 26
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
$128Frontier
Thu, Jan 22 - Sun, Jan 25
Frontier Logo
8:48 pm - 9:04 pm
ONT
-
SAT
22h 16m1 stop
Frontier Logo
1:15 pm - 2:41 pm
SAT
-
ONT
27h 26m1 stop
$129Frontier
Fri, Jan 23 - Sun, Jan 25
Frontier Logo
10:18 am - 9:04 pm
ONT
-
SAT
8h 46m1 stop
Frontier Logo
1:15 pm - 12:10 pm
SAT
-
ONT
24h 55m1 stop
$138Frontier
Mon, Feb 2 - Mon, Feb 9
Frontier Logo
1:05 pm - 8:46 pm
ONT
-
SAT
5h 41m1 stop
Frontier Logo
9:41 pm - 10:39 pm
SAT
-
ONT
26h 58m2 stops
$152Frontier
Mon, Feb 2 - Mon, Feb 9
Frontier Logo
6:20 am - 7:33 pm
ONT
-
SAT
11h 13m1 stop
Frontier Logo
1:20 pm - 7:10 pm
SAT
-
ONT
7h 50m1 stop
$155Frontier
Wed, Mar 4 - Wed, Mar 11
Frontier Logo
7:00 am - 3:14 pm
ONT
-
SAT
6h 14m1 stop
Frontier Logo
6:45 am - 11:59 pm
SAT
-
ONT
19h 14m1 stop
$156Frontier
Mon, Jan 26 - Fri, Jan 30
Frontier Logo
1:05 pm - 8:46 pm
ONT
-
SAT
5h 41m1 stop
Frontier Logo
9:59 pm - 11:24 pm
SAT
-
ONT
27h 25m2 stops
$176Frontier
Wed, Jan 28 - Sat, Jan 31
American Airlines Logo
3:09 pm - 10:58 pm
ONT
-
SAT
5h 49m1 stop
American Airlines Logo
6:00 am - 12:03 pm
SAT
-
ONT
8h 03m1 stop
$177American Airlines
Wed, Jan 28 - Sat, Jan 31
American Airlines Logo
7:16 am - 2:16 pm
ONT
-
SAT
5h 00m1 stop
American Airlines Logo
9:30 am - 4:05 pm
SAT
-
ONT
8h 35m2 stops
$182American Airlines
Booking Insights

KAYAK's insights & trends for Ontario to San Antonio flights

Get data-powered insights and trends into flights from Ontario to San Antonio to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Ontario to San Antonio?

The average price of all round-trip flights from Ontario to San Antonio clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to San Antonio on a Wednesday and more expensive on a Sunday. On your return trip to Ontario, you should consider flying back on a Friday, and avoid Thursdays for better deals.

What is the cheapest month to fly from Ontario to San Antonio?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to San Antonio, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to San Antonio is October, where tickets cost $229 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $390 and $382 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to San Antonio, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to San Antonio, you should book around 3 weeks before departure, which saves you about 26% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonAugust
Cheapest flight$52
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from Ontario to San Antonio

When to book flights from Ontario to San Antonio

Are your dates flexible? Find out the best times to travel from Ontario to San Antonio based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to San Antonio

  • Can I fly with my dog from Ontario to San Antonio?

    You can book your ticket with American Airlines or Delta Air Lines to travel with your dog from Ontario to San Antonio. These airlines permit dogs and cats to travel in the cabin or as checked baggage, depending on their size and weight. However, different fees and requirements apply.

  • What is the permitted weight and size limit for checked luggage on Frontier Airlines?

    The weight limit for checked bags on Frontier Airlines is approximately 50 lbs per bag. The maximum dimensions for checked bags are typically about 60 in, which is calculated by adding the bag's length, width, and height. Passengers must be mindful that bags weighing more than 51 lbs may incur additional fees for exceeding the weight limit.

  • What if my child wants to play at Ontario International Airport (ONT) before our flight?

    The airport has a Kids' play area, so If you're traveling with your child to San Antonio, you can head to the designated play area where your child can burn off some energy before the flight. The kid's play area usually has interactive games, climbing structures, and other fun activities that your child can enjoy doing.

  • Which airlines offer special services to individuals with disabilities from Ontario to San Antonio?

    Delta Air Lines offers excellent services for passengers with disabilities. They cater to individuals who need assistive devices like walkers, crutches, or canes, allowing them to bring these items on board and providing storage space during the flight. Passengers with disabilities can also benefit from specialized seating options, such as seats with movable armrests, extra legroom, and proximity to lavatories.

  • What is the cheapest flight from Ontario to San Antonio?

    In the last 3 days, the lowest price for a flight from Ontario to San Antonio was $52 for a one-way ticket and $125 for a round-trip.

  • Do I need a passport to fly between Ontario and San Antonio?

    A passport is not required to fly from Ontario to San Antonio.

  • Which aircraft models fly most regularly from Ontario to San Antonio?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to San Antonio?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Ontario and San Antonio, with SkyTeam being the most commonly used for this route.

  • What is the most popular layover when flying to San Antonio from Ontario?

    Phoenix is the most popular layover city among KAYAK users traveling from Ontario to San Antonio.

  • Which is the best airline for flights from Ontario to San Antonio, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to San Antonio are Southwest and Delta. With an average price for the route of $386 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $367 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Ontario to San Antonio?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to San Antonio.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to San Antonio?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Antonio from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to San Antonio?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Antonio with an airline and back to Ontario with another airline. Booking your flights between Ontario and SAT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to San Antonio?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Antonio from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Ontario to San Antonio

  • Common layovers for flights from Ontario to San Antonio occur at George Bush Intercontinental Airport (IAH) and Fort Worth International Airport (DFW). These airports are major transportation hubs offering multiple connecting flights to San Antonio. Layovers from Ontario to San Antonio vary depending on the airline and flight schedule.
  • The most convenient way to get to Ontario International Airport (ONT) is by combining public transportation and airport shuttle services. You could take a train or bus to a nearby transit center like Ontario East or Rancho Cucamonga and then catch the airport shuttle for a hassle-free and cost-effective journey, avoiding traffic and parking issues.
  • When traveling from Ontario to San Antonio, it's worth noting that Alaska Airlines provides various classes of service on many of its aircraft, including first class and premium class - ensuring a comfortable and enjoyable journey. First Class, for instance, offers passengers exclusive benefits such as priority boarding and spacious seats with extra legroom.
  • American Airlines and United Airlines greatly support unaccompanied minors flying from Ontario to San Antonio. These airlines offer the Unaccompanied Minor service for children aged 5 to 14. Trained staff members assist the children during check-in, accompany them during the flight, and supervise their arrival at the destination.
  • You need to know that San Antonio International Airport (SAT) is conveniently located near vibrant cities in Texas, including downtown San Antonio, Austin, the state capital known for music and technology, and Corpus Christi, a coastal gem. SAT serves as a gateway to diverse destinations in the Lone Star State.

Reviews of the top 5 airlines serving from Ontario to San Antonio

 
See real verified KAYAK customer reviews for airlines flying from Ontario to San Antonio. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to San Antonio? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4250 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
Airline reviews

No delays and arrived to destination 30 min early. Staff was super friendly.

10.0 ExcellentIlevba, Nov 2025
DCA - DAL
Read more Southwest reviews

No delays and arrived to destination 30 min early. Staff was super friendly.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Everything a cheap airline should be at normal airline rates.

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

Ot was overall fine. Left on time and had basic snacks. Weather was finicky but that’s not the airlines fault.

Even though we were delayed, we were able to make our connection

Crew and customer service were excellent. This flight also had plenty of leg room and seat mounted screens for entertainment. A very pleasant flight all around!

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

I flew with my dog and had already purchased my dog’s ticket. Even that morning I had called costumer service to insure that my husband and I had seats together since the website was giving me an error when choosing our seats and the representative mentioned our dog. I showed up early to the airport and when I got to the gate and we started boarding I was help back and told that I was supposed to have a yellow tag and that I should have checked in at the counter for them to give me that tag. I was not aware of this, the representative on the phone did not say anything. Nor did I see it anywhere in the checking process online, so if you travel with a pet and are not checking in luggage, just know that you still have to go to the check in counter when arriving at the airport unless you want to be the last one to board and not have room for your carry on in the overhead bins. Other than that, I had a great experience.

This flight was perfect. No complaints and only the highest regard for the crew and ground staff and how they executed perfectly. I fly a lot with United and would request predictability and transparency in their operations instead of last minute changes.

This is for UA2274 from Houston to Sacramento. The flight was delayed arriving due to mechanical issues so we left about 3 hours later than scheduled. When boarding the plane the temperature inside was excessive - likely close to 100. Pilot apologized and said it was going to improve at altitude, which it did. But before that I honestly thought there might have been more delays removing passengers made ill from the heat. We were delayed leaving due to another mechanical issue. There was not water on the plane due to a panel that was not secured. They did that quickly, but the combination of mechanical issues was rather disturbing and did not reflect well on United.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

A little late at the start but all worked out well.

I liked the humor of the captain and crew on the flight from Flagstaff to Dallas. They were humorous.

After arriving in Dallas, the aircraft taxied for an unusually long time and was unable to park at the gate, which caused a significant delay and made me miss my connecting flight. I then had to wait in a very long line to be rebooked, and I was told that no hotel or meal accommodations would be provided. What is even more unacceptable is that my luggage was mishandled and has still not been located. My suitcase contains important medications that I urgently need, and I have been unable to access them due to the airline’s mishandling. This situation has caused me considerable stress and inconvenience, and I need this issue to be resolved immediately.

I appreciated that it was on time, safe and professional. I didn’t like that I wasn’t in a place where I had a window at my window seat. It would have been nice to know that in advance. If it was mentioned in the ticketing, I didn’t notice it.

I have a gluten allergy so didn't have any food

Baggage handling poor. Second time this has happened. My bag went to San Francisco instead of Fiji. No apology. Luckily Nadi airport staff are fantastic. My bag arrived in Fiji the next day.

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

Flight delayed and missed connection. Rescheduled flight cancelled after 6 hrs wait. Rerouted thru ORD, flight cancelled, overnight stay in ORD. Still in the air on new flight!

Delayed delayed delayed and no offer for food or vouchers

A couple ladies from the crew were so rude and nasty. Thought they were mad at having to be there especially if you asked a question. This will make me think twice next time if I book a flight with you.

Uncomfortable seats and tiny tray table. Expensive snacks. Flight was on time and crew was pleasant but take me back to Southwest!

Boarding and unboarding processes were pretty smooth. I gave a low score for Boarding because of how my flight was missing from all the boards at the airport, and when I checked the flight status on the Spirit website, it said it would be departing from Terminal E, gate D15. There are no "D" gates in terminal E.

The flight was on time and the crew was very professional and accommodating. When other airlines are canceling flights Spirit is still flying with on time flights. I have no complaints and will continue to choose Spirit when it is the best option for me.

Prices for bags are extremely expensive and if you go higher on weight, the charge is ridiculous.

Waited at the airport for over 4 hours to board this flight. Terrible airline

Flight was good and on time. Everyone was nice. Seats aren't very comfortable

The seats are too small the plane makes weird noise when landing 🛬

For the minimalist experience, it is really a great ride-- feels a little like public transport i guess

I didn't order food. I requested a Tomato juice and was given a boody mary mix. The serve needs to warn the customer what their given. It wasn't a huge deal, but I wasted $4.50.

EVERYTHING! It was so bad that I will be filing a claim for reimbursement for my seat as I could not fully sit in it due to an obese person being next to me and spilling over into my "space." And my personal item in the overhead been got crushed between two suitcases, so now my business laptop has been damaged beyond repair. Also, it was expensive! Since you pay for EVERYTHING, the cost of the trip was probably more than if you I used an airline that was not discounted. I will NEVER fly Spirit Airlines again!

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

baggage clamed had to wait over a hour and half for all people on my flight it was terrible

My flight was canceled I was promised a reginf still not received.

The confirmation # CK8GNW and my name was not recognized/in Frontier system. I was able to check in on Frintier app so i went to the Frontier ticket agent, at time they told me that my name/ confirmation did not show up as a purchased ticket. I had to purchase a new ticket that cost $289.00 one way.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Worst airline experience. They were rude and kept changing our seats and/or giving our seats away so our family didn’t get to sit with each other. Almost everyone we dealt with at both airports with this airline was rude. The app kept giving us wrong information making things take longer. Dealing with them before TSA can take close to an hour…longer than I’ve ever had to deal with before. Never using this airline again.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Everything you need to know for your flight from Ontario to San Antonio

Information on your arrival and departure airports