ONT - SJU

$183 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 8/16. 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

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, 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 Ontario to San Juan, as well as popular online travel agencies
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Cheap Flights from Ontario to San Juan

 
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.

Recent round-trip flight deals from Ontario to San Juan

KAYAK's recommended round-trip deals from the most popular airlines that fly from Ontario to San Juan.
Discover the best prices for you by selecting your travel dates on KAYAK.
American Airlines Logo
11:09 pm - 2:45 pmONT-SJU
12h 36m1 stop
American Airlines Logo
5:25 pm - 9:36 amSJU-ONT
19h 11m2 stops
$365American Airlines
Find Deal
Sat, Sep 27 - Sun, Oct 5
Delta Logo
10:59 pm - 11:51 amONT-SJU
9h 52m1 stop
Delta Logo
12:56 pm - 10:29 pmSJU-ONT
12h 33m1 stop
$400Delta
Find Deal
Fri, Aug 22 - Thu, Aug 28
Delta Logo
10:59 pm - 1:29 pmONT-SJU
11h 30m1 stop
Delta Logo
12:56 pm - 7:29 pmSJU-ONT
9h 33m1 stop
$435Delta
Find Deal
Sun, Aug 24 - Thu, Aug 28
American Airlines Logo
6:23 am - 5:06 amONT-SJU
19h 43m2 stops
American Airlines Logo
12:59 am - 6:12 pmSJU-ONT
20h 13m2 stops
$437American Airlines
Find Deal
Sun, Jun 15 - Fri, Jun 20
United Airlines Logo
6:32 pm - 11:57 amONT-SJU
14h 25m2 stops
United Airlines Logo
1:05 am - 12:14 pmSJU-ONT
14h 09m2 stops
$455United Airlines
Find Deal
Mon, Jun 16 - Tue, Jun 17
United Airlines Logo
6:41 pm - 1:45 pmONT-SJU
16h 04m2 stops
United Airlines Logo
2:55 pm - 9:10 pmSJU-ONT
9h 15m1 stop
$475United Airlines
Find Deal
Thu, May 29 - Wed, Jun 4
JetBlue Logo
11:00 pm - 2:53 pmONT-SJU
12h 53m1 stop
JetBlue Logo
11:30 am - 9:41 pmSJU-ONT
13h 11m1 stop
$528JetBlue
Find Deal
Tue, Sep 9 - Sat, Sep 13
JetBlue Logo
10:59 pm - 12:44 pmONT-SJU
10h 45m1 stop
JetBlue Logo
11:55 am - 9:11 pmSJU-ONT
12h 16m1 stop
$549JetBlue
Find Deal
Fri, May 30 - Fri, Jun 6
Southwest Logo
7:35 pm - 10:50 amONT-SJU
12h 15m2 stops
Southwest Logo
5:30 am - 3:05 pmSJU-ONT
12h 35m2 stops
$565Southwest
Find Deal
Fri, Jun 20 - Tue, Jun 24
Southwest Logo
9:00 am - 11:55 pmONT-SJU
11h 55m2 stops
Southwest Logo
6:20 am - 5:25 pmSJU-ONT
14h 05m2 stops
$620Southwest
Find Deal
Thu, May 22 - Sat, May 31
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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.

What’s the cheapest day of the week to fly from Ontario to San Juan?

The average price of all round-trip flights from Ontario to San Juan Luis Munoz Marin Intl Airport clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to San Juan on a Tuesday, as we generally find the cheapest rates on that day for this route. On the other hand, Thursday is the most expensive day to fly from Ontario to San Juan. For your return ticket, we recommend flying on a Wednesday and avoiding Mondays for the best deals.

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 June, where tickets cost $377 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $745 and $728 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 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Good to know

Low seasonNovember
High seasonJune
Cheapest flight$183
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly and prices are also 32% 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 $183 for a one-way ticket and $365 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?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to San Juan are Delta and Southwest. With an average price for the route of $495 and an overall rating of 8.0, Delta is the most popular choice. Southwest is also a great choice for the route, with an average price of $569 and an overall rating of 8.0.

  • 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.

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 4293 reviews
8.0Comfort
7.1Food
8.6Crew
8.2Boarding
7.6Entertainment
Airline reviews

It was a perfect flight in all aspects! Both legs!

10.0 ExcellentAnonymous, Apr 2025LGB - SMF
Read more Southwest reviews

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Great flight staff. Ease of boarding. Overall, very uneventful and easy trip.

Employees were kind and funny, as always! Flight was late but no announcements were made for people with tight connections to help them transition quickly. No service due to turbulence.

I recently flew Southwest from San Jose to Honolulu. I was very impressed with the flight crew, especially the flight attendant in charge of the front of the plane. She came through the aisle at least five times for drinks and water, and two times for snacks. I have not seen such service since I flew first class. Also, for the first time, they gave us the correct baggage claim number, and the luggage came out quickly. I can't wait for Southwest to have assigned seating! I absolutely hate the Cattle Call boarding procedure and the mad dash to get seats and overhead bins. However, the boarding was efficient.

We had a nice flight. Boarding was easy, our seats were comfortable and the on board service was pleasant.

Service was great, boarding and exiting went smoothly, and the flight was very pleasant.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

Delta flight was on time, seats were comfortable, and crew was nice.

Bathrooms dirty sinks clogged. No one seemed to clean them. Plane very old

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

It was terrible, if they ran flights on time it would make a big difference.

Delta seems to be improving in many areas, except they are super bad with the food available. Bring back normal food service on long flights.

I actually received a notification from kayak on email but not one by text from Delta when my departure gait changed and I almost missed my flight

New boarding doesn't make sense. Filling front first is slow.

Delta flight was great from the check in all the way to arrival. However, I had a very bad experience. I requested a wheelchair and the wheelchair employee that went to pick me up from the plane in Boston to bring me to the baggage claims told me I have to pay him. I was under the impression that it was a free service and I usually give tips but the person forced me to pay and since I said no because I was upset with his demand when my daughter walked in to pick me up he demanded payment from my daughter who paid him thinking maybe now it is a charged service.

Horrible. Grateful to be alive but spent 13 hours at airport only to return back to my familys house and flight changed to next day. They tried to fix a part on plane, had no back up plane and after 10 hours , reattempted the flight and it STILL wasn't fixed. We got a meal voucher and rescheduled flight but there should be some other compensation for the 15 hours spent in airport

Liked fold flat bed. Didn’t like having no window. Didn’t like poor choice of food and being served dinner very late, hours after take off of a 7:40pm flight. Servers not friendly. Food horrible in business class.

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

The gate was too far away for the connecting flight

Compared with other carriers business class for an overnight was not worth the extra expense.

Seats were comfortable. It’s was so cold and very uncomfortable. I paid 2000 miles for wifi service that was choppy the whole flight. Would like to be reimbursed for my miles Food was so disappointing. Three cold and terrible meals for $3000 round trip. This needs to be better.

Easy to board. Flight was super crowded though so I didn't sleep well on that cross country red-eye flight. The aisles seem ot have gotten narrower and the seat smaller whn luggage and people are getting bigger so it would be AWESOME to have more space and breathing room in general ;)

Pilot Erika DeLong made us feel safe and at ease in a frankly scary time to be flying. Her warm smile and greeting and excellent command of the aircraft in foggy bumpy weather helped us all to calm our nerves and get us home safely.

Plenty of room for me and the cat in Premium Economy. Seat was comfortable. Boarding was a breeze. The lady at the special check-in desk was great, super helpful and professional.

Smooth flight. As always dinner could have been more generous. Breakfast was great.

AWFUL. I have had the experience of traveling with many airlines across the world, and hands down United Airlines is the worst. Not one flight was on time, and I don’t think I met one crew member or staff member who wasn’t rude.

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

British Airways staff are very polite and willing to help.

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

The plane was late and then sat on the runway for almost 45 minutes before taking off.

We kept being told that the flight was full and that all overhead compartments were full and therefore had to check in our hand luggage. We were some of the last people to board and noticed that there was still sufficient space in the overhead compartments. We were obliged to check in hand luggage when there was space and so had to wait at luggage retrieval which took a while to then noticed damage to our luggage - not a great experience!

Worst seats I’ve ever had !!! The seats were very narrow and uncomfortable and misaligned with the seats in front of mine leading to bottom of the seat in front of mine pressing on my legs for 15.5 hours !

This was an overnight flight. There was no meal service in first class, just a simple snack basket was offered along with beverages. There should have been some type of continental breakfast prior to arrival in PHL. As an Executive Platinum American Airlines Advantage member, I received no name recognition from the first class flight attendant. When disembarking at PHL, the flight attendants were more interested in their cell phones than saying "thank you" to the passengers as they disembarked.

The flight was quick and to the point. The crew just did their job w/o excessive talking and everything was just perfect.

Awkward carry on process. Forced to check all carry on. No overhead space of worthiness. Left delayed, but made up the time. Crew was amicable.

Amazingly comfy flight - I had upgraded for a reasonable price and it was worth it. The food also was good.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Flight was delayed 3 times, would have been nice to have received text message instead of email notifications. Frontier app wasn’t even updated accordingly, no gate number disclosed. No agent at front desk of gate to inform of delay. Very confused and left if the dark

They changed the timing , first delayed by 4 hours then went back to 40 mins late, we had to run back to airport to not miss our flight. This is ridiculous

No frills for sure. No gate announcements about flight delay, not even water to drink on the flight.

The flight left over two hours late. They charged me $180 to bring a carry on. There was an error with the spelling of my name and Frontair agent lied that I would need to pay $200 for her to fix the spelling, and pressured me that if I don't do it quick I would lose the flight. I called back and another agent said it costs $75 to fix. All in all, this company is a complete scam.

I took my first and last flight with FRONTIER. The seats are not able to be reclined so it’s not a very comfortable experience when you take a flight of 3 hours or longer. You must pay for your luggage either carry on or check in, so taking all this in consideration at the end what you think you’re saving your paying in services that should be included. Not a beverage in sight. . You’re seriously better off getting on a proper airline such as Delta, AA, United, etc.

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

It was a redeye flight, so every passenger just wanted to sleep, but through the entire flight, the flight crew made announcements over the loudspeaker at maximum volume every few minutes making sleep impossible. For example: it’s 2am, and the crew decides to give an extremely detailed announcement about snacks and beverages for sale. And 3am is the perfect time to wake up everyone with a lengthy announcement about how to get a coffee refill and how to take advantage of new offer from frontier for a credit card.

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

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