SAT - ONT

$75 Find Cheap Flights from San Antonio to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Antonio to Ontario departing on 10/25. 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 Ontario

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Antonio to Ontario 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 San Antonio to Ontario

Tue, Jul 29 - Sat, Aug 9
Frontier Logo
3:06 pm - 9:52 pmSAT-ONT
8h 46m1 stop
Frontier Logo
7:00 am - 2:21 pmONT-SAT
5h 21m1 stop
$128Frontier
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Tue, Jul 29 - Fri, Aug 8
Frontier Logo
3:06 pm - 9:52 pmSAT-ONT
8h 46m1 stop
Frontier Logo
12:59 am - 6:02 pmONT-SAT
15h 03m1 stop
$187Frontier
Find Deal
Tue, Aug 12 - Wed, Aug 20
American Airlines Logo
2:15 pm - 10:48 pmSAT-ONT
10h 33m1 stop
American Airlines Logo
11:59 pm - 11:38 amONT-SAT
9h 39m1 stop
$265American Airlines
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Wed, Sep 17 - Mon, Sep 22
American Airlines Logo
12:44 pm - 10:33 pmSAT-ONT
11h 49m1 stop
American Airlines Logo
6:10 am - 5:00 pmONT-SAT
8h 50m1 stop
$274American Airlines
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Fri, Aug 15 - Tue, Aug 19
Southwest Logo
2:20 pm - 4:30 pmSAT-ONT
4h 10m1 stop
Southwest Logo
5:45 am - 3:10 pmONT-SAT
7h 25m2 stops
$329Southwest
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Fri, Aug 29 - Mon, Sep 1
Southwest Logo
3:35 pm - 8:50 pmSAT-ONT
7h 15m1 stop
Southwest Logo
12:55 pm - 11:50 pmONT-SAT
8h 55m2 stops
$333Southwest
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Fri, Aug 1 - Mon, Aug 4
Delta Logo
6:03 pm - 11:42 pmSAT-ONT
7h 39m1 stop
Delta Logo
5:09 pm - 12:35 amONT-SAT
5h 26m1 stop
$343Delta
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Tue, Aug 12 - Wed, Aug 20
United Airlines Logo
2:15 pm - 8:54 pmSAT-ONT
8h 39m2 stops
United Airlines Logo
5:10 am - 3:26 pmONT-SAT
8h 16m2 stops
$346United Airlines
Find Deal
Wed, Jul 30 - Tue, Aug 5
Delta Logo
6:03 pm - 11:42 pmSAT-ONT
7h 39m1 stop
Delta Logo
11:40 am - 12:14 amONT-SAT
10h 34m1 stop
$353Delta
Find Deal
Tue, Jul 29 - Sat, Aug 9
United Airlines Logo
5:30 am - 12:32 pmSAT-ONT
9h 02m2 stops
United Airlines Logo
6:00 am - 3:25 pmONT-SAT
7h 25m1 stop
$372United Airlines
Find Deal
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KAYAK's insights & trends for San Antonio to Ontario flights

Get data-powered insights and trends into flights from San Antonio to Ontario 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 San Antonio to Ontario?

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

For San Antonio to Ontario, Friday is the cheapest day to fly on average and Thursday is the most expensive. Flying from Ontario back to San Antonio, the best deals are generally found on Wednesday, with Sunday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Antonio to Ontario, 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 San Antonio to Ontario is February, where tickets cost $236 (return) on average. On the other hand, the most expensive months are October and December, where the average cost of round-trip tickets is $432 and $397 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Antonio to Ontario, 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 San Antonio to Ontario, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Low seasonFebruary
High seasonJuly
Cheapest flight$75
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from San Antonio to Ontario

When to book flights from San Antonio to Ontario

Are your dates flexible? Find out the best times to travel from San Antonio to Ontario 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 San Antonio to Ontario

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

    In the last 3 days, the lowest price for a flight from San Antonio to Ontario was $75 for a one-way ticket and $128 for a round-trip.

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

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from San Antonio to Ontario?

    When flying out of San Antonio you will be using San Antonio. You will be landing at Ontario, also known as Ontario.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from San Antonio to Ontario 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 $386 and an overall rating of 8.0.

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

    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 San Antonio to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from San Antonio 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 San Antonio to Ontario?

    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 Ontario with an airline and back to San Antonio with another airline. Booking your flights between San Antonio and ONT 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 San Antonio to Ontario?

    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 Ontario from San Antonio up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

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

 
See real verified KAYAK customer reviews for airlines flying from San Antonio to Ontario. 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 San Antonio to Ontario? 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 4272 reviews
8.2Boarding
7.6Entertainment
8.6Crew
7.0Food
8.0Comfort
Airline reviews

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

8.0 ExcellentMichael, Jun 2025PHX - SAN
Read more Southwest reviews

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

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

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

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

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

Boarded plane and then delayed 1.5 hours while on the plane

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

We were given vouchers we couldn’t use with a 5.5 hour delay

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

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

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

A bit rush for transit. Food and entertainment are not available

Boarding gate in Honolulu was staffed with a great clerk with a soothing voice despite the flight delay of over an hour. Flight attendants in the plane were all grumpy, not pleasant looking bunch. Their sour attitude showed throughout the flight. Inly able to get a select few movies started. Most of the movie links in the “free entertainment” did not work.

This was a horrible experience. For a first class experience, my chair was held together by 3M tape - and I have a photo. The crew weren’t very attentive, somewhat dismissive and forgot my drink and snack, the chair reclined about 3 inches on a 6-hour cross country flight. I was also not informed that there was no lounge available in Newark airport because of renovations, so all around this was one of the worst experiences and I would actively avoid both American and Alaska Air going forward.

Boarding was very efficient. Everyone got on board and we got on our way very quickly. It was frustrating that the entertainment app was not functioning properly. I was not able to activate some of the movies offered. The crew on this flight appears to be pretty grumpy. They had no smile on their faces. I felt like they were doing us a favor for being there.

Loved the staff, boarding and drink options! Wish the comfort of the seat could have been better nevertheless

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

Long 5 hour and 45 min flight and only one drink service and cookie snack

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

Flight boarded from Gate 39 at OGG, the farthest gate in the terminal. There were no Hawaiian themed amenities for the flight. The first class service was mediocre at best; I received not special welcome or recognition as an executive platinum member of American Advantage program. The flight attendants were more concerned with their cell phones than saying "thank you" to the passengers as we disembarked. Fortunately, the flight arrived at LAX a few minutes early.

Bigger seats. Board back to front! Disembark front to back!

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

Unfortunately, spirits crew had us boarding and parking the plane often, would wait long periods of time before allowing the people attending the flight on the plane to know what was going on this caused for my plane to not only get diverted but then canceled at an airport 2 hours away and basically stranded with charter buses MAYBE being hired. I was left with no choice but to stay overnight and use a comp room in Altantic City to then arrive home the next day. This trip was the first time seeing my partner since he joined the Air Force and this stressful ride caused unwarranted tears on what was supposed to be an east flight home. I understand weather is unpredictable but to have passengers deboard to then reboard an hour later to taxi on the runway for another hour to then basically leave an entire fight stranded. I waited almost 30 minutes at the airport and not one employee could tell me about a charter bus so I had to leave and make accommodations to stay overnight and get a ride home.

Boarding was a breeze, however, two of the flights that I boarded with Spirit did not have Wi-Fi available.

Very good. Nothing more or less than expected. No complaints.

My experience with the spirit as a first time it was OK, but the seats need a little cushion, the problem I had the most impacted me was when checking in the scales were so off and wrong. It will tell that you would have more weight, which was not true. The scale was say that it had Thirty Eight Pounds, when get in the labels when we send the luggage into the band. It says that it was overweight. I really really dislike that because the scales are not accurate. If I use Spirit and I have that issue again. That will be my last time flying with the spirit, even though I like so much to service the planes, and everything else

hahaha we are delayed for one hour plus.. but thx we arrived San Diego safe

Worst airline ever! The guy weighing my bag had his foot on the metal plate and when I called him out on it, I got this stupid little smirk. La is a scam and so is Spirit Airlines. All the flight attendants looked like they hated our flight just as much as we did.

Unclear pricing; ended up being charged an extra $52 just to get onboard

Spirit is awful. Too expensive for what you get. Stop nickel and diming.

would be great to get basic water, soda at least and stop charging for carry ons

Your crew is a representation of your Standards and Values. The crew from Seattle to LAX, was very disappointing. The crew was more interested in hanging out at the lobby area. Talking, laughing loudly and eating all the snacks. They did not do regular rounds to see if customers needed anything. This was a huge disappointment. I will no longer be flying with your airlines moving forward.

We were delayed three times ,and that destroyed my plans, and reservations

Very bad! No good service delayed my second connection flight

They canceled flight. Hard to believe there was even a plane incoming for us to get on

Book with frontier airlines with the mentality that they'll cancel your flight, kick you off and lose your luggage. Anything besides that is a win. Compare prices with other airlines (to include luggage) and if frontier is still worth it, book it but know all of their policies.

Plane was down graded and I lost my uncharged exit row with more leg room. No mention or offer of refund from podium. Flight attendant was nice to explain this happens often and that I could request a refund via online form submission. I did this and have heard nothing back.

Horrendous. I do not recommend Frontier. The passengers lack manners and decency, and the flight attendants lack professionalism. If I wasn’t in a bind to fly with 48 hours notice for a job interview, I would not have selected a flight with Frontier and I never plan to fly with them in the future.

The reps working at the airport counter were dumber than a second coat of paint.

The seats were hard molded plastic covered in plastic vinyl. And the scam to charge people extra to sit together. Don’t they know we can just ask someone to trade seats. And watching the staff separate young children from parents… super classy. We had to guilt them into offering up our seats. This companies policies suck. Don’t give them your money.

Landing in terminal 2, but my luggage is terminal 3. We (and others) were looking for it in terminal 1. We probably missed the crew broadcast, but the communication could have been clearer for non native (or elderly) passengers.

Everything went as planned. Crew was great. Seats were still not that comfortable.

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