ONT - SAT

$103 Find Cheap Flights from Ontario to San Antonio - Compare and Save

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 8/4. 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, 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$208
Typical prices: $228-$407
Frontier
Tue 8/4Tue 8/11
ONT - SAT • 1 stop
Cheapest one-way
$103
Typical prices: $109-$241
Frontier
Tue 8/4
ONT - SAT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Ontario and San Antonio. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $310 (round-trip)
Shortest trip • 4h 45m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 31% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 39% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Antonio!
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

Tue, Aug 4 - Tue, Aug 11
Frontier Logo
3:40 pm - 8:37 pm
ONT
-
SAT
26h 57m
1 stop
Frontier Logo
9:32 pm - 3:14 pm
SAT
-
ONT
19h 42m
1 stop
$208Frontier
Tue, Aug 25 - Wed, Aug 26
Frontier Logo
6:00 am - 6:54 pm
ONT
-
SAT
10h 54m
1 stop
Frontier Logo
7:49 pm - 11:55 pm
SAT
-
ONT
6h 06m
1 stop
$210Frontier
Wed, Jul 29 - Tue, Aug 4
Frontier Logo
6:00 am - 6:44 pm
ONT
-
SAT
10h 44m
1 stop
Frontier Logo
9:32 pm - 8:03 am
SAT
-
ONT
12h 31m
1 stop
$218Frontier
Tue, Jul 21 - Tue, Aug 4
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
$220Frontier
Wed, Aug 12 - Wed, Aug 19
Frontier Logo
5:08 pm - 8:37 pm
ONT
-
SAT
25h 29m
1 stop
Frontier Logo
10:24 pm - 8:03 am
SAT
-
ONT
11h 39m
1 stop
$224Frontier
Wed, Jul 22 - Wed, Jul 29
Frontier Logo
1:38 pm - 8:37 pm
ONT
-
SAT
4h 59m
1 stop
Frontier Logo
7:39 pm - 11:50 pm
SAT
-
ONT
6h 11m
1 stop
$227Frontier
Wed, Jul 22 - Tue, Jul 28
Frontier Logo
1:38 pm - 8:37 pm
ONT
-
SAT
4h 59m
1 stop
Frontier Logo
7:39 pm - 10:04 am
SAT
-
ONT
16h 25m
1 stop
$228Frontier
Wed, Jul 22 - Tue, Jul 28
Frontier Logo
1:38 pm - 8:37 pm
ONT
-
SAT
4h 59m
1 stop
Frontier Logo
7:39 pm - 11:50 pm
SAT
-
ONT
6h 11m
1 stop
$230Frontier
Sat, Aug 15 - Tue, Aug 18
Frontier Logo
6:00 am - 6:54 pm
ONT
-
SAT
10h 54m
1 stop
Frontier Logo
8:26 pm - 10:04 am
SAT
-
ONT
15h 38m
1 stop
$231Frontier
Sat, Aug 1 - Tue, Aug 4
Frontier Logo
11:52 am - 8:37 pm
ONT
-
SAT
6h 45m
1 stop
Frontier Logo
7:39 pm - 10:04 am
SAT
-
ONT
16h 25m
1 stop
$232Frontier
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.

How much is a round-trip flight from Ontario to San Antonio?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to San Antonio departing in August.

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 $204 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $406 and $406 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 4 weeks before departure, which saves you about 31% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.

Good to know

Low seasonAugust
Cheapest flight$103
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly with an average 16% 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 5 days, the lowest price for a flight from Ontario to San Antonio was $103 for a one-way ticket and $208 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.

  • 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 $403 and an overall rating of 7.9, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $446 and an overall rating of 7.8.

  • 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.
7.9
SouthwestOverall score based on 4246 reviews
7.5Entertainment
7.0Food
8.1Boarding
8.0Comfort
8.6Crew
Airline reviews

SW can't get their wifi right. I upgrade to insure wifi service but the last two trips had intermittent service. Not worth the extra costs.

6.0 GoodAnonymous, Jun 2026
TPA - DAL
Read more Southwest reviews

SW can't get their wifi right. I upgrade to insure wifi service but the last two trips had intermittent service. Not worth the extra costs.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

I elected to pay for the upgrades and found very little difference

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

Great flight but super high price. Glad it was a business trip and not personal

Service was great, boarding and exiting went smoothly, and the flight was very pleasant.

It was good. I wish you had gluten free snacks for my husband.

The crew and flight went well. My issue was internal communications. I had a connecting flight that initially was changed to a later time since first flight was delayed, then they changed back to original time because “the captain thought hed make it”. Upon arrival at connecting airport, the flight attendant assured that the connecting flight was still there and I should run to the gate after deplaning…well that was inaccurate. The plane had departed and gate was empty. I was stuck at airport 4 hours hungry and irritated and also had to again cancel my transportation plans at destination. After informing the help desk I was given a dry oh well and a measly $15 food voucher that barely could afford anything at that airport.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

There were over 40 people in the “preboard” group. It’s not fair for southwest to charge for an upgraded boarding fee (a1-a15) and then let over 40 people board before.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

Smaller plane for a longer flight than my first one. Doesn’t make sense.

Lounge in Lagos is terrible, food on board from Lagos to Atlanta was horrible. Only bright spot the cabin crew were awesome.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Our flight was delayed in Atlanta. The staff could have gave us an explanation for the delay and how long it would be.

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

Good breakfast granola bar good crew seamless flight and baggage transfer we’ll done!

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

No screens or meal options. Freezing cold. Dirty seats. Left late.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Complimentary light meal would be appreciated. But great flight crew service on all legs

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

No access to the Wi-Fi, noisy group of people made it difficult for me to hear through my earbuds. Snacks and drinks - limited service when your seat is at the back of the plane - people up front are always served first and the back gets whatever is left. Not pleased.

Didn't make it dir to delays - no support from United staff

My seat was broken. WiFi didn’t work. Gate crew at HOU were rude and condescending. Treated all the passengers badly. Bad experience, United.

Flight was delayed multiple times without giving any particular reason and the only thing that was communicated was that 'Aircraft is getting ready'. I was stuck at SFO airport for 15 hours and finally took Southwest Airlines flight back home to Dallas.

The gate experience at LAX was abysmal (same for the arrival experience two days prior). Despite the LAX -> SAT schedule of two flights daily, our departure gate was at a smaller hub that we had to be bussed to from Terminal 4. Fortunately, I arrived at LAX extra early and had time to spare, but if I had not known, I might have missed my flight. I looked at the LAX airport map in the AA app and there was no indication of the additional boarding process. Lastly the gate area we were bussed to was crowded with limited food and beverage options. On flight, the fight attendant was hospitable and attentive, the flight was smooth, and AA's free (and working) wifi for AA members were all on the positive side.

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Got home at 3am after deboarding the plane. No compensation offered by American

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

The flight was on time and arrived early. The crew were friendly and helpful.

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!

Awkward carry on process. Forced to check all carry on. No overhead space of worthiness. Left delayed, but made up the time. Crew was amicable.

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

First time experience and though you'll pay for *everything* meaning bags, water/snacks, even a question with a service agent - - all in all, not a bad experience whatsoever.

Long lines, rude staff, everything that's offered you have to pay for.

The last time I flew Frontier was in the 1960s when it was a “real” airline. We flew this time because of the price & schedule. As the saying goes, you get what you pay for.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

I like the easy check-in and boarding process. I love the non stop flight

Flight was delayed for more than 3 hours, crew at ONT airport was rude, and when we got to DFW the airplane had an issue landing, we had to be taxied to the terminal, and the luggage was hold until the next day.

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

Information on your arrival and departure airports