SJU - ONT

$231 Find Cheap Flights from San Juan 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 Juan to Ontario departing on 10/13. 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 Juan 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 Juan to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$384
Typical prices: $407-$510
Delta
Fri 9/25Wed 9/30
SJU - ONT • 1 stop
Cheapest one-way
$231
Typical prices: $293-$353
JetBlue
Tue 10/13
SJU - ONT • 1 stop
Top airlines
Cheapest • from $384 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between San Juan and Ontario. You'll need at least 1 connection.
Insights
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Insights
Top layover airports
Cheapest • Avg $389 (round-trip)
Shortest trip • 9h 21m (one-way)
Insights
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Insights
When to book
in advance
Our data shows that travelers who book at least 14 weeks in advance save around 50% compared to booking last minute.
Insights
Insights
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Insights
When to travel
Cheapest • 44% 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 Juan to Ontario (SJU-ONT)

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

Fri, Sep 25 - Wed, Sep 30
Delta Logo
2:59 pm - 10:26 pm
SJU
-
ONT
10h 27m
1 stop
Delta Logo
6:00 pm - 12:03 pm
ONT
-
SJU
15h 03m
2 stops
$384Delta
Fri, Sep 25 - Wed, Sep 30
American Airlines Logo
6:27 am - 10:37 pm
SJU
-
ONT
19h 10m
2 stops
American Airlines Logo
12:37 pm - 9:24 am
ONT
-
SJU
17h 47m
2 stops
$396American Airlines
Wed, Aug 19 - Mon, Aug 24
Southwest Logo
5:15 am - 2:05 pm
SJU
-
ONT
11h 50m
2 stops
Southwest Logo
8:40 pm - 11:00 am
ONT
-
SJU
11h 20m
2 stops
$430Southwest
Fri, Aug 21 - Mon, Aug 31
American Airlines Logo
7:30 am - 6:15 pm
SJU
-
ONT
13h 45m
2 stops
American Airlines Logo
4:07 pm - 12:40 pm
ONT
-
SJU
17h 33m
2 stops
$437American Airlines
Sat, Sep 12 - Thu, Sep 17
United Airlines Logo
1:00 am - 12:50 pm
SJU
-
ONT
14h 50m
2 stops
United Airlines Logo
7:13 pm - 12:54 pm
ONT
-
SJU
14h 41m
2 stops
$442United Airlines
Sun, Oct 25 - Wed, Nov 4
United Airlines Logo
1:21 pm - 8:56 pm
SJU
-
ONT
10h 35m
1 stop
United Airlines Logo
5:00 am - 6:25 pm
ONT
-
SJU
9h 25m
1 stop
$449United Airlines
Fri, Sep 25 - Wed, Sep 30
American Airlines Logo
3:35 pm - 10:37 pm
SJU
-
ONT
10h 02m
1 stop
American Airlines Logo
12:37 pm - 9:24 am
ONT
-
SJU
17h 47m
2 stops
$450American Airlines
Wed, Oct 21 - Sun, Nov 1
United Airlines Logo
2:55 pm - 9:59 pm
SJU
-
ONT
10h 04m
1 stop
United Airlines Logo
5:00 am - 6:25 pm
ONT
-
SJU
9h 25m
1 stop
$474United Airlines
Sat, Aug 29 - Tue, Sep 8
United Airlines Logo
2:00 pm - 8:53 pm
SJU
-
ONT
9h 53m
1 stop
United Airlines Logo
6:00 am - 8:38 pm
ONT
-
SJU
11h 38m
1 stop
$479United Airlines
Thu, Sep 24 - Fri, Oct 2
United Airlines Logo
2:55 pm - 9:59 pm
SJU
-
ONT
10h 04m
1 stop
United Airlines Logo
5:00 am - 5:38 pm
ONT
-
SJU
9h 38m
1 stop
$484United Airlines
Booking Insights

KAYAK's insights & trends for San Juan to Ontario flights

Get data-powered insights and trends into flights from San Juan 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 Juan Luis Munoz Marin Intl Airport 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 Juan Luis Munoz Marin Intl Airport to Ontario departing in September.

What is the cheapest month to fly from San Juan Luis Munoz Marin Intl Airport to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Juan Luis Munoz Marin Intl Airport 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 Juan Luis Munoz Marin Intl Airport to Ontario is January, where tickets cost $288 (return) on average. On the other hand, the most expensive months are March and August, where the average cost of round-trip tickets is $889 and $665 respectively.

How far in advance should I book a flight from San Juan Luis Munoz Marin Intl Airport 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 Juan Luis Munoz Marin Intl Airport 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 Juan Luis Munoz Marin Intl Airport to Ontario, you should book around 14 weeks before departure, which saves you about 50% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$231
Best time to beat the crowds with an average 44% drop in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from San Juan to Ontario

When to book flights from San Juan to Ontario

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

  • What is the cheapest flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

    In the last 5 days, the lowest price for a flight from San Juan Luis Munoz Marin Intl Airport to Ontario was $231 for a one-way ticket and $384 for a round-trip.

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

    Yes, you’ll need a passport to travel to Ontario from San Juan.

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

    On your way to Ontario, you’ll fly out from San Juan Luis Munoz Marin Intl. You’ll be landing at Ontario.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from San Juan to Ontario are Southwest and United Airlines. With an average price for the route of $570 and an overall rating of 7.9, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $520 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from San Juan 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 Juan to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from San Juan 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 Juan 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 Juan with another airline. Booking your flights between San Juan 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 Juan 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 Juan 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 Juan to Ontario

 
See real verified KAYAK customer reviews for airlines flying from San Juan 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 Juan 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.
7.9
SouthwestOverall score based on 4246 reviews
8.6Crew
8.0Comfort
8.1Boarding
7.5Entertainment
7.0Food
Airline reviews

The flight was late. The crew was rude. There was no food. Cramped and uncomfortable. Nothing about this flight was good.

2.0 MediocreIrene, Jun 2026
DEN - SFO
Read more Southwest reviews

The flight was late. The crew was rude. There was no food. Cramped and uncomfortable. Nothing about this flight was good.

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 first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Terrible all around. Left prior review detailing massive delay/cancellation to then rebook travel. Topping on the cake was lost luggage even after travel to ultimate destination was secured on a new plane(s).

Never went on board this flight. Kayak uses Underpricer (which is a scam business) as it's "customer service provider". This customer service is a classic bait and switch "service". I Got caught in the UnderPricer Bait and switch scam. 14 hours on the phone with people from India with heavy accents and upselling me to useless products. The original sell was a flight on spirit. Then they contact me later, an say after they have my money that the flight is no good as is is only one seat for a party of two. I am still in dispute to get my money back. Went to Spirit direct and had a beautiful vacation. I should never have used Kayak and their rip off artists UnderPricer.

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

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

I like everything about Southwest. From customer service to crew and prices. I travel a lot during the year and Southwest is the best!!

Friendly crew, but we were delayed for more than an hour and had to change planes due to maintenance issues.

United has been holding my money for a cancel on another ticket they wouldn’t let me fly for going on 5 months. Terrible service I wouldn’t choose to buy tickets or fly with united again. Very bad experience generally dishonorable and poor service .

The flight got delayed. They forgot to bring the drinks when I asked for it. The toilet is messy.

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Service was professional and quick. Premium economy seat was comfortable given the class

Awful. There was a minor problem with a fridge and they had us 2 hours in the runway before take off. The paper work alone took them half hour. There was no attemp to make up time up while in teansit and when we arrived, they had us another half hour in the plane because of traffic. I, and a bunch of people, lost their onnection flights for 5 to 10 minutes. Not even the attemp to wait given thar all delays, but the taxing, were United's fault. Then another 45 mins to get an agent and no flight alternatives for 2 days. Im am very disapointed with this "premium carrier".

IT WAS A LONG TIME SINCE THE LAST TIME I TRAVELED. I THOUGHT I WAS TO BE LOST BUT EVERYONE WAS PRETTY NICE WITH ME AND MADE MY EXPERIENCE NICE. THANKS

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

There was a delay that was unexpected. The seats were uncomfortable for the length of the flight.

AA was a very good experience. The employees are wonderful

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.

We had a very pleasant flight with very comfortable seats and nice staff.

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

Seats in coach aren't padded enough for a 6 hour flight

My trip was delayed for more than 3 hours without any explanation. Also I have a business meeting that I lost.

the handling of my luggage. It was Lost or stolen At my destination.

If we travel with carry on expected to being able to carry the luggage. Could be good if take in consideration the date of reservation to do that

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.

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

Information on your arrival and departure airports