ONT - SAT

$72 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 10/7. 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

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, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Antonio, as well as popular online travel agencies
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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

Wed, Sep 3 - Thu, Sep 11
Frontier Logo
12:59 am - 7:15 pmONT-SAT
16h 16m1 stop
Frontier Logo
8:16 pm - 7:23 amSAT-ONT
13h 07m1 stop
$143Frontier
Find Deal
Thu, Sep 11 - Sun, Sep 14
Frontier Logo
3:43 pm - 11:46 amONT-SAT
18h 03m1 stop
Frontier Logo
9:55 am - 7:53 amSAT-ONT
23h 58m1 stop
$144Frontier
Find Deal
Mon, Sep 22 - Thu, Sep 25
Frontier Logo
6:00 am - 1:16 pmONT-SAT
5h 16m1 stop
Frontier Logo
8:20 pm - 7:54 pmSAT-ONT
25h 34m1 stop
$146Frontier
Find Deal
Thu, Oct 9 - Sun, Oct 12
Frontier Logo
6:05 am - 1:19 pmONT-SAT
5h 14m1 stop
Frontier Logo
2:14 pm - 7:47 amSAT-ONT
19h 33m1 stop
$149Frontier
Find Deal
Wed, Sep 17 - Wed, Sep 24
 Logo
8:00 am - 1:23 pmONT-SAT
27h 23m1 stop
 Logo
9:47 pm - 8:26 amSAT-ONT
12h 39m1 stop
Wed, Oct 8 - Sat, Oct 11
 Logo
8:00 am - 1:19 pmONT-SAT
27h 19m1 stop
 Logo
6:00 am - 12:37 pmSAT-ONT
8h 37m1 stop
Wed, Sep 17 - Wed, Sep 24
American Airlines Logo
12:47 pm - 11:00 pmONT-SAT
8h 13m1 stop
American Airlines Logo
6:00 am - 10:04 amSAT-ONT
6h 04m1 stop
$217American Airlines
Find Deal
Sat, Sep 13 - Wed, Sep 17
American Airlines Logo
1:10 pm - 7:57 pmONT-SAT
4h 47m1 stop
American Airlines Logo
5:00 am - 10:04 amSAT-ONT
7h 04m1 stop
$227American Airlines
Find Deal
Tue, Sep 16 - Tue, Oct 28
Southwest Logo
5:25 am - 5:25 pmONT-SAT
10h 00m1 stop
Southwest Logo
7:25 am - 12:20 pmSAT-ONT
6h 55m2 stops
$228Southwest
Find Deal
Tue, Sep 16 - Tue, Sep 23
Delta Logo
10:00 pm - 9:32 amONT-SAT
9h 32m1 stop
Delta Logo
7:45 am - 12:17 pmSAT-ONT
6h 32m1 stop
$257Delta
Find Deal
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 August, where tickets cost $293 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $389 and $386 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 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$72
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 4% 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 $72 for a one-way ticket and $143 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?

    oneworld, SkyTeam, and Star Alliance 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 $388 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 $352 and an overall rating of 8.0.

  • 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 4246 reviews
8.0Comfort
7.5Entertainment
8.1Boarding
8.6Crew
7.0Food
Airline reviews

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

10.0 ExcellentJoseph, Aug 2025SFO - BWI
Read more Southwest reviews

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Multiple delays and gate changes. Arrived at final destination 6 hours late. All rental cars had been taken.

The movies using Southwest WiFi kept pausing and I had to restart multiple times.

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.

The woman gate agent in Phoenix was none too sympathetic about my check-in process as I am relatively new with using apps. I almost did not get on because she said I did not check-in. I thought I had via Kayak where I purchased a very expensive ticket. Lesson learned but to be told I may not get on as a matter of factly was difficult to hear.

Gate agent did not hold flight for connection, provided no assistance to get new flight

The plane pushed back from the gate on time. However, it stopped on the ramp, and we waited for over 20 minutes before the aircraft pulled back to the gate. Apparently, something of importance had to be removed from the aircraft by the gate agent. I found this to be odd. The delay was not significant, but I felt that whatever was on the aircraft that had to be taken off, should’ve been done before we pushed back from the gate.

Smooth boarding process. Early departure, smooth flight, early arrival. The entertainment package has very good recent movie options. The flight crew were friendly and professional.

I don’t understand the purpose of the orange “priority” tag on my bag. This tagged, my bag is last or near to the last bag to come down the carousel at IAH.

Oh my gosh, I loved my experience with United! they made me want to travel more often.

The planes are so dirty! Food crumbs and finger print smudges, Dust over the vents and carpet stains. It’s disgusting.

Great flight. No issues at all. I still think boarding could be more efficient but otherwise, a good experience.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

It was very difficult to stretch my knee out and I am very short. I also had a torn tendon in my knee which made it extra uncomfortable anyways. My husband is 6'2" and I can't imagine him flying in that plane.

Delayed flight, so I switched fights to SFO to Phoenix , Phoenix to DSM. Excellent service through American Airlines

The AA app really sucks ... Every flight & connecting flights were delayed over 30 mins. One connecting flight on American Eagle said it was delayed in its arrival ... when it was actually parked across from the gate for over 1 hr before they pulled it to the gate. Seats in the economy/ main cabin are packed together like sardines ... no leg room.

The flight delay in Dallas created a domino effect that impacted all connecting flights, leading to an increase in the number of connections. As a result, I missed my flight from Casablanca to Marrakech due to the tight turnaround when landing in Casablanca. CMN Airport was understaffed; only one employee was available to assist passengers while others just stood by and watched. It was an extremely frustrating situation. Many passengers were crying and banging their hands on the counter while talking to customer service representative Allabough. Unfortunately, Allabough couldn’t change my flight in the system. At the same time, I was on the phone with an American Airlines customer service representative named Solomon, who said he couldn’t make the change either. So, I decided to take an ONYA Voyages train from Casablanca to Marrakech to reach my destination on Friday, June 26. It turned out to be an unpredictable trip.

Pretty bad gate mgmt upon arrival. No open gates and we had to wait at midnight. Shouldn’t be a surprise that an aircraft is coming in.

Comfortable plane ride however on delays disappointment no real details as to why the delays when other flights are leaving the airport

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

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!

One of worst experienc my family have every had with this airline. I was informed my Kayak that my flight was delayed and that my family will not make it to houston for our connecting flight. I contacted Spirit customer service to get my family on a later flight due to the delay in Vagas and them not making their connecting flight. The customer rep keep telling me that the flight from vagas is on time and not delayed. She even make to go to the spirit app on my phone and show me how to look up weather or not the flight was delayed. The app showed "on time" 20 minutes later when my family arrived at the airport for their flight, they were told that the flight was delayed and she will not make her connecting flight. I call spirit airline customer support again that night and spoke to another rep who apologize for his collegue and he told me that my family will receive a credit for this, this was on Saturday I still have not received the credit or an email letting me know when I will be credited for this inconvenience. This is not good business and it need to be fixed.

It was very bad it got delayed by 2 hours.Never going to travel with spirit airlines in future.

Flight delayed over 3 or 4 hours because no captain to fly plane. I couldn’t make a connection and had to wait 9 hours for another flight. Had to fly red eye flight. Sucks

I wanted to upgrade my seat because I’m 6’2 and never have enough leg room for my comfort. They upgraded my seat for free putting me in an emergency exit seat. I was very comfortable

We had an almost 7 hour flight delay. We left the gate twice and taxi-ed and then returned the gate twice. Finally we got a new flight crew (our third one) and then left the gate to the final time before departing at 6:45pm (original flight time was 12pm). Out of Newark.

First off, i received an e-mail to allow me to check in for our flight. I folllowed the link, when it came to the seat selection, I was unable to select any "free" seats ( meaning without any additional charge) because everything was " unavailable". My Husband and I were ttavelling with our 3 children hence, i wanted to be assured that we were all seated next to each other. I tried 3 times and everytime I click the selection it said " error loading". What the system wants is for me to buy the seats ( anywhere from $25 to $50 dollars each passenger) like I did on our flight bound to L.A. I called customer service and the guy was unhelpful all he kept repeating was to come really early at the airport and we will be assigned seats there. Imagine my anxiety!!! Spirit says they are a budget airline but they are actually the opposite!! And just before our flight, the flight attendant KEPT announcing/ selling the seats that were not purchased for a cheaper price!! Like it was a bidding/ bargaining game! This was our first and last time to fly Spirit.

My flight got cancelled by Spirit airlines, it was bad experience to me

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….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Flight was delayed 3 times, would have been nice to have received text message instead of email notifications. Frontier app wasn’t even updated accordingly, no gate number disclosed. No agent at front desk of gate to inform of delay. Very confused and left if the dark

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

Information on your arrival and departure airports

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