ONT - SJU

$192 Find Cheap Flights from Ontario to San Juan

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 Juan departing on 10/11. 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 Juan Luis Munoz Marin Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Juan.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Juan.
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Everything you should know

Cheapest round-trip
$384
Typical prices: $495-$925
Delta
Sun 11/1Fri 11/13
ONT - SJU • 1 stop
Cheapest one-way
$192
Typical prices: $258-$353
Delta
Sun 10/11
ONT - SJU • 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 Ontario and San Juan. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $176 (round-trip)
Shortest trip • 9h 10m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 7 weeks in advance save around 7% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 29% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to San Juan!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to San Juan (ONT-SJU)

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

Sun, Nov 1 - Fri, Nov 13
Delta Logo
11:15 pm - 12:36 pm
ONT
-
SJU
9h 21m
1 stop
Delta Logo
2:05 pm - 11:48 pm
SJU
-
ONT
13h 43m
2 stops
$384Delta
Mon, Aug 17 - Mon, Aug 24
American Airlines Logo
4:07 pm - 9:43 am
ONT
-
SJU
14h 36m
2 stops
American Airlines Logo
7:22 pm - 9:34 am
SJU
-
ONT
17h 12m
2 stops
$437American Airlines
Fri, Nov 6 - Wed, Nov 11
Delta Logo
11:15 pm - 12:36 pm
ONT
-
SJU
9h 21m
1 stop
Delta Logo
3:35 pm - 10:14 pm
SJU
-
ONT
10h 39m
1 stop
$442Delta
Wed, Aug 26 - Sun, Aug 30
United Airlines Logo
5:00 am - 8:38 pm
ONT
-
SJU
12h 38m
2 stops
United Airlines Logo
2:20 pm - 9:59 pm
SJU
-
ONT
10h 39m
1 stop
$446United Airlines
Thu, Aug 20 - Tue, Aug 25
Southwest Logo
11:00 am - 11:50 pm
ONT
-
SJU
9h 50m
2 stops
Southwest Logo
5:15 am - 2:05 pm
SJU
-
ONT
11h 50m
2 stops
$460Southwest
Sat, Aug 29 - Mon, Aug 31
Southwest Logo
1:00 pm - 9:10 am
ONT
-
SJU
17h 10m
2 stops
Southwest Logo
5:00 am - 3:15 pm
SJU
-
ONT
13h 15m
2 stops
$463Southwest
Tue, Nov 10 - Wed, Nov 11
United Airlines Logo
5:00 am - 12:36 am
ONT
-
SJU
15h 36m
2 stops
United Airlines Logo
8:05 am - 6:29 pm
SJU
-
ONT
14h 24m
2 stops
$479United Airlines
Fri, Nov 6 - Mon, Nov 16
Southwest Logo
8:45 pm - 12:40 pm
ONT
-
SJU
11h 55m
2 stops
Southwest Logo
5:45 am - 12:50 pm
SJU
-
ONT
11h 05m
2 stops
$480Southwest
Sat, Nov 7 - Wed, Nov 11
United Airlines Logo
6:36 pm - 2:40 pm
ONT
-
SJU
16h 04m
2 stops
United Airlines Logo
8:05 am - 6:29 pm
SJU
-
ONT
14h 24m
2 stops
$484United Airlines
Thu, Aug 27 - Sun, Aug 30
United Airlines Logo
7:13 pm - 2:44 pm
ONT
-
SJU
16h 31m
2 stops
United Airlines Logo
2:20 pm - 9:59 pm
SJU
-
ONT
10h 39m
1 stop
$489United Airlines
Booking Insights

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

Get data-powered insights and trends into flights from Ontario to San Juan 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 Juan Luis Munoz Marin Intl Airport?

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 Juan Luis Munoz Marin Intl Airport departing in November.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to San Juan Luis Munoz Marin Intl Airport, 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 Juan Luis Munoz Marin Intl Airport is October, where tickets cost $391 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $655 and $635 respectively.

How far in advance should I book a flight from Ontario to San Juan Luis Munoz Marin Intl Airport?

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 Juan Luis Munoz Marin Intl Airport, 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 Juan Luis Munoz Marin Intl Airport, you should book around 7 weeks before departure, which saves you about 7% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$192
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Ontario to San Juan

When to book flights from Ontario to San Juan

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

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

    In the last 5 days, the lowest price for a flight from Ontario to San Juan Luis Munoz Marin Intl Airport was $192 for a one-way ticket and $384 for a round-trip.

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

    A passport is required to fly from Ontario to San Juan.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to San Juan are Southwest and Delta. With an average price for the route of $561 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 $552 and an overall rating of 7.8.

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

    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 Juan.

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

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

    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 Juan with an airline and back to Ontario with another airline. Booking your flights between Ontario and SJU 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 Juan?

    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 Juan from Ontario 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 Ontario to San Juan

 
See real verified KAYAK customer reviews for airlines flying from Ontario to San Juan. 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 Juan? 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
8.1Boarding
7.5Entertainment
8.0Comfort
8.6Crew
7.0Food
Airline reviews

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

10.0 Excellentkelly, Jul 2026
SFO - PHX
Read more Southwest reviews

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

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

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

it was great. the crew is exceptional. the flight was on time.

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.

It was as good as it could be. Flying is not a pleasant experience these days.

Very good flight. Crew was great. No issues and we even arrived early.

It was good. The leg room was not great in Row 1.

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.

When we checked in my friend and I were sitting seperate. By the time we got to boarding, they automatically switched our seats. I really liked that.

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.

I trust Delta. I travel comfortable. The snacks could improve or could go to something as a little sandwich.

Great staff. Clean plane, but we were delayed for more than an hour due to maintenance issues and had to board another plane.

I was very disappointed with my experience at the United Airlines baggage check. The representative was rude and unhelpful. I was required to remove approximately 1.5 pounds from my two checked bags, even though it was a very small amount over the limit. The interaction was unnecessarily unpleasant, and I expected much better customer service. I hope United will review this incident and provide additional customer service training to its staff.

No extra snacks were available. Meals quality is terrible. Crew was not friendly.

Lost one piece of luggage even though I checked in 2.5 hours before the flight

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.

I was promised by United Airline (operated by ANA) that I will be seated together with my kids as I am the only adult flying with two minors. We did not get seats together in our 11 hours flight from LA to Tokyo. When asked at the gate, ANA representative said United Airline should have informed them that there is a parent flying with two minors. He said they can’t do anything in the system as the flight is full. He ask me to ask passengers next to me and the kids if they are willing to change seats. This is ridiculous! However, I went in the flight and asked other passages but no one willing to change seats. 11 hours and we were seating separately. I was very disappointed with this. It made things super inconvenient for me.

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

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

My flight was completely full. Making me very stressful with people walking around all the time. I believe airlines can do better for entertain people during the flight.

The United website was easy to use and had all the information I needed. I needed to change my flight and it was accomplished easily on line. I was also easily able to upgrade and for a reasonable price. Boarding went smoothly and the flight was in time. The service was good in board but the crew did not seem happy at all. Limited availability of meals - not much choice for purchase and in business class they ran out of one of the meal choices by row 4. .

Delayed delayed. Poor professionalism. Our seats changed and we pay for them

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.

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 plane was broken so we had to change planes.

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!

Uncomfortable seats and flight attendant was rude as she insisted on waking up my husband to ask him if he wanted a drink. When he said that he was sleeping, she replied “without an attitude “. He was seated at 8c

Airlines must do something with overweight people... Maybe reserve a business class seat for them, or you could pay the consequences if someone overweight seat side by side to you in economy.

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.

Flight was delayed many times. The crew was friendly but you eleven had to buy headphones to access the movies in the plane. $8 is not a lot for one person but it is when you travel with all your family.

Seats were great, the staff was great, and the food was about the best I've had on a plane, and is especially the best of any US-based carrier I've flown. Free Wi-Fi was also great.

It was inexplicably canceled and we are stuck in LA, haven't gotten home and it has been an inconvenience having lost work (on unpaid leave for my husband).

It was good. I’m very disappointed that they don’t give commentary ear pods for the movie. I forgot mine at home

JetBlue is always consistent and great, the food is limited in selection, but at least you can grab as much as you want on snacks and drinks at the Blue Locker.

at the time for boarding the lady just call Group A and no other goups and everybody from A to F go inside without the right turn,and when we get in theres no more spsce for carry on , the ones that get in at not correct group from the back occupy our space !!!!! a mess !!!!

The boarding and flight were ok, but there were several painful issues. The flight was 3:20 in the air and almost four hours door to door, but they only had snack packs on the plane. They really need to have food on longer flights or make it clear to everyone that they won’t have food. They also advertise free WiFi, but it did not work for 90% of this flight. Again, almost four hours door to door. If I had known I was flying spirit for JetBlue prices then I would have planned differently.

I think the food / snack service was very poor. tehy could have done better. Evrything else was great

No wifi, not even while close to the continental US or Puerto Rico, no entertainment whatsoever (TVs not working). Totally disappointing.

Wifi screens were great. Both flights were delayed, spending all day flying home and then getting home at 3am ruins the next day also.

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

Information on your arrival and departure airports