SAT - ONT

$80 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 5/19. 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 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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41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$159
Typical prices: $385-$291
Frontier
Mon 5/18Wed 5/20
SAT - ONT • 1 stop
Cheapest one-way
$80
Typical prices: $158-$276
Frontier
Tue 5/19
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.
Insights
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Top layover airports
Cheapest • Avg $292 (round-trip)
Shortest trip • 5h 00m (one-way)
Insights
Insights
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When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 33% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 24% 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 Ontario!
Flight Deals
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

Mon, May 18 - Wed, May 20
Frontier Logo
8:59 pm - 3:44 pm
SAT
-
ONT
20h 45m
1 stop
Frontier Logo
4:39 pm - 8:14 pm
ONT
-
SAT
25h 35m
1 stop
$159Frontier
Mon, May 11 - Tue, May 19
Frontier Logo
8:59 pm - 3:44 pm
SAT
-
ONT
20h 45m
1 stop
Frontier Logo
4:39 pm - 8:14 pm
ONT
-
SAT
25h 35m
1 stop
$179Frontier
Wed, May 20 - Tue, May 26
Frontier Logo
7:54 pm - 10:05 am
SAT
-
ONT
16h 11m
1 stop
Frontier Logo
6:00 am - 6:59 pm
ONT
-
SAT
10h 59m
1 stop
$184Frontier
Tue, May 19 - Sun, May 24
Frontier Logo
7:54 pm - 11:49 pm
SAT
-
ONT
5h 55m
1 stop
Frontier Logo
6:00 am - 6:59 pm
ONT
-
SAT
10h 59m
1 stop
$185Frontier
Sat, May 23 - Wed, May 27
Frontier Logo
7:54 pm - 11:49 pm
SAT
-
ONT
5h 55m
1 stop
Frontier Logo
6:00 am - 6:59 pm
ONT
-
SAT
10h 59m
1 stop
$188Frontier
Sat, May 9 - Wed, May 13
Frontier Logo
7:54 pm - 10:05 am
SAT
-
ONT
16h 11m
1 stop
Frontier Logo
4:39 pm - 8:14 pm
ONT
-
SAT
25h 35m
1 stop
$199Frontier
Sat, May 9 - Sun, May 10
Frontier Logo
7:54 pm - 10:05 am
SAT
-
ONT
16h 11m
1 stop
Frontier Logo
4:04 pm - 8:14 pm
ONT
-
SAT
26h 10m
1 stop
$209Frontier
Tue, May 19 - Tue, May 26
Frontier Logo
7:54 pm - 11:49 pm
SAT
-
ONT
5h 55m
1 stop
Frontier Logo
10:50 am - 6:59 pm
ONT
-
SAT
6h 09m
1 stop
$210Frontier
Sat, May 23 - Thu, May 28
Frontier Logo
7:54 pm - 11:49 pm
SAT
-
ONT
5h 55m
1 stop
Frontier Logo
11:51 am - 8:14 pm
ONT
-
SAT
6h 23m
1 stop
$214Frontier
Wed, May 20 - Sun, May 24
Frontier Logo
7:54 pm - 11:49 pm
SAT
-
ONT
5h 55m
1 stop
Frontier Logo
6:00 am - 6:59 pm
ONT
-
SAT
10h 59m
1 stop
$215Frontier
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 May.

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 $485 and $466 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 2 weeks before departure, which saves you about 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low seasonJuly
Cheapest flight$80
Best time to beat the crowds but there is an average 29% increase in price.
Most popular time to fly and prices are also 12% 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 $80 for a one-way ticket and $159 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?

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

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

    The two airlines most popular with KAYAK users for flights from San Antonio to Ontario are Southwest and United Airlines. With an average price for the route of $414 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $466 and an overall rating of 7.4.

  • 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 4 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 4314 reviews
8.1Boarding
8.0Comfort
7.0Food
8.6Crew
7.5Entertainment
Airline reviews

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

8.0 ExcellentCheryl, Apr 2026
DEN - SBA
Read more Southwest reviews

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

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

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

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

3 hour delay. Had to change plans and was still delayed.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight was delayed from take off because only one runway was operational in San Francisco.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

Packed in plane small uncomfortable seats elbow to elbow nobody wants to be in that situation for the money they paid

Checking in united could not figure out my star alliance gold. Baggage did not get marked priority and didn't receive boarding passes. When got to SFO lounge personal fixed everything Immediately

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Fine. The issues I had were associated with luggage being delayed from Turkey to Tanzania

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Flight: Started on time. Comfortable flight. Arrived on time. Crew: Very cordial and helpful. Drinks and snack was served with a smile. Overall enjoyed the trip. Regards, Hari Doss Chanchala Doss

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

American Airlines is a miserable experience. It is predictably miserable, in the sense that every time I fly American, I brace myself for the certainty that it will be unpleasant and uncomfortable. But it is unpredictable in the sense that I never know if the flight will be on time or delayed nine hours (both happened to me this week). I never know if I will be able to sit in the seat that I selected when I purchased the ticket or if I will be told by Customer Service (!!!) that I must relocate from first class to a seat in the back of the aircraft with no explanation (both happened to me this week). Will the food be frozen and half defrosted, or scalding hot? Will the drinks be warm? Will the flight attendants be surly and mean? Will the toilets be cramped and foul? Will the seats be narrow and uncomfortable? Will there be a real electric outlet at the seat, or just an unreliable USB-2 port? Will there be enough seats in the boarding lounge or just a few? Will the boarding process be smooth and efficient, or will the gate agents mess it up and delay it needlessly for 30 or 40 minutes? Will the catering and cleaning crew be prompt or will they take an extra 30 minutes? Will the brakes on the aircraft work properly, or will the pilot delay takeoff for four hours while the ground crew attends to what can only be described as routine maintenance that should have been done the night before? I've eexperienced every one of these unpleasant things this year, 2026. The only thing I can reliably count on is that American will find a new way to make the experience of flying as miserable as they possibly can.

Wifi was spotty. Tray table was very dirty when I sat down.

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Delayed for mechanical and no updates on what was happening and how long the delay might be.

A first class seat should fit a fat person, and this doesn't. The trays in the armrest are less functional than an ordinary tray in the back of the seat.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

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

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

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

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

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.

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

Information on your arrival and departure airports