ONT - SJU

$133 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 4/14. 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
$327
Typical prices: $658-$426
Multiple Airlines
Wed 4/15Thu 4/23
ONT - SJU • 1 stop
Cheapest one-way
$133
Typical prices: $268-$378
Frontier
Tue 4/14
ONT - SJU • 2 stops
Top airlines
Cheapest • from $354 (round-trip)
Best reviews • 8.0 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
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Insights
Top layover airports
Cheapest • Avg $176 (round-trip)
Shortest trip • 8h 51m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 17% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 32% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
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

Wed, Apr 15 - Thu, Apr 23
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
Multiple Airlines Logo
3:21 am - 11:55 pm
SJU
-
ONT
47h 34m
2 stops
$327Multiple Airlines
Wed, Apr 15 - Tue, Apr 21
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
Multiple Airlines Logo
6:30 am - 11:55 pm
SJU
-
ONT
44h 25m
2 stops
$332Multiple Airlines
Wed, Apr 15 - Sat, Apr 25
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
Multiple Airlines Logo
8:00 am - 7:31 am
SJU
-
ONT
50h 31m
2 stops
$333Multiple Airlines
Wed, Apr 15 - Wed, Apr 22
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
Multiple Airlines Logo
10:59 am - 7:31 am
SJU
-
ONT
23h 32m
2 stops
$338Multiple Airlines
Mon, Apr 20 - Sat, Apr 25
Multiple Airlines Logo
12:59 am - 2:01 am
ONT
-
SJU
22h 02m
2 stops
Multiple Airlines Logo
5:45 am - 10:37 pm
SJU
-
ONT
19h 52m
1 stop
$341Multiple Airlines
Sun, Apr 19 - Sat, Apr 25
Multiple Airlines Logo
12:59 am - 11:29 pm
ONT
-
SJU
19h 30m
2 stops
Multiple Airlines Logo
5:45 am - 10:37 pm
SJU
-
ONT
19h 52m
1 stop
$347Multiple Airlines
Wed, Apr 15 - Thu, Apr 23
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
Multiple Airlines Logo
1:55 pm - 7:31 am
SJU
-
ONT
20h 36m
2 stops
$353Multiple Airlines
Sat, Apr 18 - Wed, Apr 22
United Airlines Logo
7:00 am - 8:34 pm
ONT
-
SJU
10h 34m
1 stop
United Airlines Logo
2:55 pm - 9:50 pm
SJU
-
ONT
9h 55m
1 stop
$354United Airlines
Tue, Apr 21 - Wed, Apr 22
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
Multiple Airlines Logo
10:59 am - 7:31 am
SJU
-
ONT
23h 32m
2 stops
$359Multiple Airlines
Mon, May 4 - Fri, May 8
United Airlines Logo
5:00 am - 5:38 pm
ONT
-
SJU
9h 38m
1 stop
United Airlines Logo
7:20 am - 10:35 pm
SJU
-
ONT
18h 15m
2 stops
$367United 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 April.

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 May, where the average cost of round-trip tickets is $812 and $685 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 3 weeks before departure, which saves you about 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$133
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly and prices are also 7% lower on average.
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 3 days, the lowest price for a flight from Ontario to San Juan Luis Munoz Marin Intl Airport was $133 for a one-way ticket and $327 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 $562 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 $597 and an overall rating of 7.9.

  • 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.
8.0
SouthwestOverall score based on 4331 reviews
8.6Crew
7.0Food
8.0Comfort
8.1Boarding
7.5Entertainment
Airline reviews

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

10.0 ExcellentMartie, Mar 2026
LGB - BNA
Read more Southwest reviews

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

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.

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

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

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

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

The wifi on the plane is great. The only issue that I have is that I prefer an aisle seat and on my trips this week, I was either in the middle or window. If we can work to secure aisle seating, I will be thrilled. Nice trip.

Great flight but super high price. Glad it was a business trip and not personal

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

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

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

Everything I mentioned earlier - the airbus was more comfortable indeed and the experience was further enhanced.

The plane was an older model, so it wasn’t as comfortable as others. The flight attendants were not helpful during onboarding. It was a full flight so there was chaos finding space for baggage.

They delayed the flight from 9:00 to 11:55 At 11:45 they canceled the flight. I paid a premium price for the tickets with poor service

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Business class seats felt very cramped compared to other airlines.

OK, we were delayed and had to de plane and reboard.

The 777’s economy seat’s legroom was more tolerable than expected. I appreciate the reclining mechanism which slides the seat forward to minimize cannibalizing the space behind. The food was terrible: very salty.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

Staff were good. My seat was in need of repair, but for a short flight was not problematic. Usual basic snack and drink setup that you'll find on any US carrier. Over, a decent, basic flight.

Complimentary light meal would be appreciated. But great flight crew service on all legs

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

We had turbulence ever 1/2 hr or so and the captains announcements were SOOOO LOUD

I was in last row so that is never great bc the person in front of me leaned his seat all the way back into me.

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.

Terrible planning. And even worse gate agents. Absolutely rude behavior.

Flight was scheduled at 11:26am but they keep Delaying until midnight. They waited at airport restless.

Rough flight No beverage service due to turbulence Bottom Seat cushion was non existent

Not good. One of my luggage is missing. And until now they can’t find it

My 9:50AM flight was delayed to 3:40PM "due to incoming aircraft delay". No aircraft is "delayed" that long. Found out once we did board (after several changes in times) that the aircraft had a maintenance issue and we had to wait for another aircraft. Just tell us that. The aircraft we did get was old and the seats need to be updated. I have been traveling for several weeks with AA and you should refresh your entertainment content as frequent flyers have gone through most of your new content. I have Celiac and a shellfish allergy and continue to have struggles with meals on business and first class flights. Please keep this in mind. Sorry - was a long travel day yesterday and a bit cranky this morning with my experience comments. Still an AA fan.

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

Dloght delayed by 2.5 hrs . Common theme in my last four american floghts

They are rarely on time! Very hard to plan your travels when flights or connections keep getting delayed.

Remind customers of the need to have passport or new ID for boarding.

The flight never took off and we spent 7 hours at the airport

First of all we hade waited 3 hours in the airplane waiting to leave. Second the return schedule was changed and it messed up my entire vaction. I won't buy never again another flight and recommend to nobody traveling with them.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

The worst. They don’t follow procedure for boarding per group. Flight got delayed for no understandably reasons, they changed our destination from PR to Miami, left us inside a plane for more than 8 hours, then cancelled flight in Miami leaving us stranded. Poorly managed re-accommodation for a new flight and overnight stay so I have to spend in a new ticket and my own hotel room to been able to get to my office next day. Lost 2 days of work and as a doctor, patients loosing their appointments. to other flights and besides

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

I liked the price of the flight and the chance to buy a seat with no person seated in the middle seat.. Also the flight was right on time.

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

Information on your arrival and departure airports