SAT - ONT

$103 Find Cheap Flights from San Antonio to Ontario - 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 San Antonio to Ontario departing on 8/5. 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

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Everything you should know

Cheapest round-trip
$208
Typical prices: $225-$396
Frontier
Tue 8/11Tue 8/18
SAT - ONT • 1 stop
Cheapest one-way
$103
Typical prices: $107-$223
Frontier
Wed 8/5
SAT - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between San Antonio and Ontario. You'll need at least 1 connection.
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Top layover airports
Cheapest • Avg $297 (round-trip)
Shortest trip • 5h 05m (one-way)
Insights
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When to travel
Cheapest • 24% price drop
Most popular
Good to know
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Booking Insights
Flight Deals

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, Aug 11 - Tue, Aug 18
Frontier Logo
9:32 pm - 3:14 pm
SAT
-
ONT
19h 42m
1 stop
Frontier Logo
6:00 am - 7:31 pm
ONT
-
SAT
11h 31m
1 stop
$208Frontier
Tue, Aug 4 - Tue, Aug 11
Frontier Logo
7:39 pm - 11:50 pm
SAT
-
ONT
6h 11m
1 stop
Frontier Logo
1:38 pm - 8:37 pm
ONT
-
SAT
4h 59m
1 stop
$210Frontier
Tue, Aug 18 - Wed, Sep 9
Frontier Logo
10:24 pm - 3:54 pm
SAT
-
ONT
19h 30m
1 stop
Frontier Logo
2:55 pm - 6:54 pm
ONT
-
SAT
25h 59m
1 stop
$220Frontier
Tue, Aug 4 - Mon, Aug 10
Frontier Logo
9:32 pm - 8:03 am
SAT
-
ONT
12h 31m
1 stop
Frontier Logo
10:49 am - 6:54 pm
ONT
-
SAT
6h 05m
1 stop
$231Frontier
Tue, Aug 4 - Sat, Aug 8
Frontier Logo
7:39 pm - 10:04 am
SAT
-
ONT
16h 25m
1 stop
Frontier Logo
10:49 am - 6:54 pm
ONT
-
SAT
6h 05m
1 stop
$232Frontier
Wed, Aug 5 - Sat, Aug 8
Frontier Logo
7:49 pm - 11:50 pm
SAT
-
ONT
6h 01m
1 stop
Frontier Logo
6:00 am - 6:54 pm
ONT
-
SAT
10h 54m
1 stop
$233Frontier
Tue, Aug 4 - Fri, Aug 7
Frontier Logo
7:39 pm - 10:04 am
SAT
-
ONT
16h 25m
1 stop
Frontier Logo
6:00 am - 6:54 pm
ONT
-
SAT
10h 54m
1 stop
$238Frontier
Mon, Aug 3 - Tue, Aug 11
Frontier Logo
7:39 pm - 11:50 pm
SAT
-
ONT
6h 11m
1 stop
Frontier Logo
1:38 pm - 8:37 pm
ONT
-
SAT
4h 59m
1 stop
$239Frontier
Tue, Aug 4 - Sun, Aug 9
Frontier Logo
7:39 pm - 11:50 pm
SAT
-
ONT
6h 11m
1 stop
Frontier Logo
10:49 am - 6:54 pm
ONT
-
SAT
6h 05m
1 stop
$240Frontier
Wed, Aug 19 - Sat, Sep 12
Frontier Logo
8:26 pm - 10:04 am
SAT
-
ONT
15h 38m
1 stop
Frontier Logo
2:55 pm - 6:54 pm
ONT
-
SAT
25h 59m
1 stop
$243Frontier
Booking Insights

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.

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

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

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 November, where tickets cost $273 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $416 and $416 respectively.

Good to know

Low season

April

Cheapest flight

$103
Best time to beat the crowds but there is an average 7% increase in price.
Most popular time to fly with an average 15% increase in price.
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 5 days, the lowest price for a flight from San Antonio to Ontario was $103 for a one-way ticket and $208 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?

    oneworld is the only airline alliance operating flights between San Antonio and Ontario.

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

    The two airlines most popular with KAYAK users for flights from San Antonio to Ontario are Southwest and American Airlines. With an average price for the route of $436 and an overall rating of 8.0, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $400 and an overall rating of 7.1.

  • 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 3 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 4241 reviews
8.6Crew
8.1Boarding
7.5Entertainment
7.0Food
8.0Comfort
Airline reviews

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

6.0 GoodSteven, Jun 2026
LAS - ONT
Read more Southwest reviews

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Great vacation. Can't wait till next year for another one.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

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

Our flight to Oakland was great bc the plane was new but it was delayed by 15min not bad at all. Over all it was an 8/10

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

The flight in it self was good. The delays looking for pilots was unexpected.

Mechanical delay > Crew Time out. No communication to passengers. Crew time out was positioned as a surprise (even though it must have been know at the time of boarding that the crew would time out.

Initial flight had an engine overheat - returned to DFW. Had another plane ready, but crew timed out. Had to wait 5h for boarding. Fully boarded and pilot says plane is not flight worthy. Deplane and go to the other end of the terminal. Wait an hour to board third plane because the crew couldn’t leave the second plane because no wheelchairs were brought to remove passengers. Finally take off and there is no catering (in flight service) even in first class. Very much an AA failure.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Amazing I love American. I’ll never fly anyone else if I can help it.

Deplaning time. Having to wait 10 to 25 minutes after boarding to leave the gate. Having to wait 10 minutes to park at the gate to deplane.☹️

When you pay for Premium Economy on an 787 and you’re promised amenities for the extra money, you expect them to work. They didn’t. USB connector wouldn’t charge continuously. 120v outlet wouldn’t hold anything you plugged into it. The adapter would just fall out. The noise canceling headphones stopped noise cancelling in the first 15 minutes for EVERYONE. No one on the plane knew how to fix it so I couldn’t listen to any movies. I just put in my AirPods and went to sleep. Very unhappy with the crappy Panasonic entertainment system. I won’t buy premium again.

Everything was great except for the wifi was junk. Crew was super friendly and helpful

My first time flying American Airlines, my first flight to CLT was wonderful and flight attendants was nice and had great customer service. My second flight from CLT to NY was very delayed due to whatever reason the crew was not greeting other than that I’m rate 8 .

It was fine. I didn't love the food but it was at least a real attempt at serving a meal, unlike my earlier flight from Nashville to Dallas.

The boarding process went very quickly, faster than I’ve ever seen boarding occur. I understand the need for efficiency, but the groups were called so quickly that there was a lot of chaos at the gate and people running through the airport. Then we all sat on the plane for a while, which seemed silly.

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

Flight was cancelled and was not able to get another flight thru Frontier. Per frontier a refund was issued but I do not see a refund on my Afirm account.

The flight crew and flight attendants are poorly trained and demonstrate poor professionalism. They have a sloppy appearance and communicate with patrons poorly. It is embarrassing for them to be representatives of an airline and for them to be called professionals.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Why are you charged for everything possible?? I went to my flight 2hours early so I can get some food.. I went to the agent to ask them to check me in and print out boarding pass.. I was told they charge for that. What in the world is that about? I understand if I’m trying to check in over the phone yes by all means charge for service.. if I’m rite there at the building asking to get checked in and get charged for it, that’s uncalled for and asking for more money at every given possibility

Was charged 99 dollars for a bag despite agents previously telling me it would be ok. Customer service was unhelpful

I will like you ( Frontier Airlines) to fly into LAX instead of ONT because I live in LA and the subway takes me to my house in just 15 minutes

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

Information on your arrival and departure airports