$175 Find Cheap Flights from Puerto Rico 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 to Ontario departing on 9/24. 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

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Cheap Flights from Puerto Rico to Ontario

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

Thu, Sep 24 - Mon, Sep 28
American Airlines Logo
11:51 am - 10:43 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
13h 52m2 stops Miami Phoenix Sky Harbor Intl
American Airlines Logo
1:04 pm - 11:00 amONT  Ontario-SJU San Juan Luis Munoz Marin Intl
18h 56m2 stops Phoenix Sky Harbor Intl Miami
$342American Airlines
Thu, Sep 24 - Mon, Sep 28
American Airlines Logo
4:19 pm - 9:29 amSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
20h 10m1 stop Dallas/Fort Worth
American Airlines Logo
1:04 pm - 11:00 amONT  Ontario-SJU San Juan Luis Munoz Marin Intl
18h 56m2 stops Phoenix Sky Harbor Intl Miami
$342American Airlines
Wed, Oct 14 - Sun, Oct 18
American Airlines Logo
6:20 am - 6:44 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
15h 24m2 stops Miami Dallas/Fort Worth
American Airlines Logo
7:34 pm - 11:20 amONT  Ontario-SJU San Juan Luis Munoz Marin Intl
12h 46m2 stops Phoenix Sky Harbor Intl Charlotte Douglas
$349American Airlines
Thu, Sep 24 - Mon, Sep 28
United Airlines Logo
2:00 pm - 8:58 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
9h 58m1 stop Denver Intl
United Airlines Logo
6:00 am - 8:38 pmONT  Ontario-SJU San Juan Luis Munoz Marin Intl
11h 38m1 stop Houston George Bush Intcntl
$414United Airlines
Thu, Nov 12 - Sun, Nov 15
Delta Logo
1:55 pm - 9:59 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
12h 04m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:10 pm - 12:45 pmONT  Ontario-SJU San Juan Luis Munoz Marin Intl
9h 35m1 stop Atlanta Hartsfield-Jackson
$426Delta
Wed, Nov 11 - Sun, Nov 15
American Airlines Logo
6:28 am - 10:12 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
19h 44m1 stop Charlotte Douglas
American Airlines Logo
6:00 am - 12:16 amONT  Ontario-SJU San Juan Luis Munoz Marin Intl
14h 16m1 stop Dallas/Fort Worth
$442American Airlines
Mon, Sep 21 - Sun, Sep 27
Delta Logo
7:00 am - 6:07 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
14h 07m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:05 am - 10:19 pmONT  Ontario-SJU San Juan Luis Munoz Marin Intl
12h 14m1 stop Atlanta Hartsfield-Jackson
$461Delta
Wed, Nov 4 - Mon, Nov 23
Delta Logo
7:45 am - 10:43 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
18h 58m2 stops New York John F Kennedy Intl Seattle/Tacoma Intl
Delta Logo
5:53 pm - 5:20 pmONT  Ontario-SJU San Juan Luis Munoz Marin Intl
19h 27m2 stops Seattle/Tacoma Intl New York John F Kennedy Intl
$468Delta
Wed, Oct 21 - Sun, Nov 1
United Airlines Logo
2:00 pm - 8:58 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
9h 58m1 stop Denver Intl
United Airlines Logo
7:00 am - 9:00 pmONT  Ontario-SJU San Juan Luis Munoz Marin Intl
10h 00m1 stop Chicago O'Hare Intl
$504United Airlines
Fri, Oct 2 - Mon, Oct 5
United Airlines Logo
2:00 pm - 8:58 pmSJU  San Juan Luis Munoz Marin Intl-ONT Ontario
9h 58m1 stop Denver Intl
United Airlines Logo
6:00 am - 8:38 pmONT  Ontario-SJU San Juan Luis Munoz Marin Intl
11h 38m1 stop Houston George Bush Intcntl
$504United Airlines
Booking Insights

KAYAK's insights & trends for flights to Ontario

Get data-powered insights and trends for flights to Ontario to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights 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 to Ontario is January, where tickets cost $288 on average for return flights. On the other hand, the most expensive months are July and March, where the average cost of tickets from Puerto Rico is $1,150 and $889 respectively. For one-way flights, the best month to travel is May with an average price of $187.

How far in advance should I book a flight to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights 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, you should book around 11 weeks before departure, which saves you about 44% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low season

August

Cheapest flight

$175
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly and prices are also 23% lower on average.
Flight from San Juan to Ontario

FAQs - booking Ontario flights

  • How far is Ontario Airport from central Ontario?

    Ontario Airport is 3 miles from the center of Ontario.

  • What is the name of Ontario’s airport?

    There is only 1 airport in Ontario, called Ontario Airport (ONT). It can also be referred to as Ontario or Ontario Intl.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to 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 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to Ontario are there each week?

    Each week there are around 980 direct flights from within Puerto Rico to Ontario. The most common day for departures is Sunday, with 18% of flights taking off on this day.

Top tips for finding cheap flights to Ontario

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Ontario flight deals.

Reviews of the top airlines flying from Puerto Rico to Ontario

 
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Puerto Rico to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with 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.
7.4
United AirlinesOverall score based on 10113 reviews
7.7Boarding
7.3Comfort
6.7Food
8.1Crew
7.1Entertainment
Airline reviews

the seat has a problem. the back had a hole.

6.0 GoodAnonymous, Aug 2026
Read more United Airlines reviews

the seat has a problem. the back had a hole.

Old 757 with poor entertainment system. United no longer partners with United for free text and email. O'Hara an absolute disaster! Limited gates clauses two hour delay. Unfortunately this appears to be the norm.

The entire experience convinced my wife, Cathy, and me that traveling Polaris on United is the only way we’ll fly in the future. From check-in and baggage drop to the end of the 12-hour flight, the customer service was exceptional, with numerous staff members exemplifying the very best in care. On board, Andre, our primary crew chief, was sincerely friendly, a consummate professional, and, along with Freddy, one of his team members, truly among the best of the best. The captain even came through the cabin to chat with passengers—a wonderful personal touch, especially on such a long journey.

The SFO lounge closes at 12 midnight. My flight took off at 2AM

Delayed 2 hours while stuck on the aircraft. If the luggage was properly loaded the first time we probably wouldn’t have been delayed at all

Flight be on time would be a good start. Then train your flight attendants to be attentive and friendly. This time they completely forgot my row for the measly snack! United, do better!

We boarded the plane and were about to take off when we were notified that the tires had to be checked. Upon inspection, they were found to need replacement, so the entire plane had to be deboarded. After we exited the plane, United staff forced us to stay in the gate area by posting "Do Not Exit" signs on the doors connecting the gate area to the terminal. Many of us had already rebooked our flights and had no checked bags, but they told us we could not leave. This seemed inappropriate to hold people under false pretenses. When the agent told us we could leave, I asked them to please take down the "Do Not Exit" signs, as they were misleading. The agent refused, and I told them that it didn't feel right to hold people like that.

It was a short, comfortable flight. It did leave an hour late due to the pilot having to be replaced (family emergency) but that didn’t inconvenience myself & my friend. The situation was explained, eventually.

There was a piece of plastic baked into my buttermilk biscuit! I have a pictures. The flight attendants in first class were really apologetic, and tried to rectify the situation. I I am very appreciative that they were able to give me some packets of pretzels and gummy bears. I understand they don't personally handle the food until warming it up so I know it wasn't their fault. I don't know whether it was a newer aircraft, or different food packaging, but I was happy that when the food was being warmed up - it didn't smell like plastic. Jokes on me with finding plastic in my food.

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.

Awful! We boarded and then sat on the plane for 50 mins before having to deplane due to a maintenance issue which should have been addressed before boarding. Then we had to change terminals as there was no other plane for us at the current terminal. Then we waited another 2 and a half hours to board again only to wait for 50 mins on the plane again for the snacks to be brought from the broken plane. And once we were on the flight we still only got the complimentary cookie and soda or water. No food vouchers provided even though we had waited over 3 hours for our flight.

Our experience with American Airlines was extremely disappointing and honestly made an already exhausting international journey much worse. After flying all the way from Melbourne and dealing with significant jet lag, the American Airlines experience at LAX was the last thing we needed. The terminal and boarding area felt very old and uncomfortable, with little to no air conditioning and only old fans running in the area. Boarding was also through outdoor stairs rather than a jet bridge, which felt especially inconvenient after such a long journey. Even though we were traveling First Class, the onboard experience was surprisingly poor. There were no meaningful snack options, no decent coffee available to order, and the aircraft was so small that there was barely enough overhead space for carry-on luggage. The staff experience was also disappointing and lacked the warmth or attentiveness we had experienced on our international flights. To make matters worse, the flight departed late, extending an already very long travel day. Overall, the combination of the outdated terminal, uncomfortable boarding process, limited First Class service, small aircraft, poor staff experience, and delay made this an extremely unpleasant final leg of our journey. It significantly worsened our exhaustion and jet lag rather than making the connection home easier. Unfortunately, this experience was bad enough that I do not plan to travel with American Airlines again in the future.

No food. I paid over $1.000 for my ticket for nuts and espresso beans.

My flight in Dallas had maintenance issues. Which caused us to missed our connecting flight in LA. We had to stay overnight in Los Angeles. American Airlines booked us a hotel. The hotel was the Holiday Inn. It was horrible. The whole hotel smelled like weed and there were people rambling all night long up and down the hallways. The carpets in the hallway and the room has stains. There was dirt on the floor. It was so nasty that I slept in my clothes.

Great. Clean. Seats comfortable. Food was free. Had new release movies.

The airplane I love and I love I came back safe thank you American airlines

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.

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

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 to Ontario

Information on the airport you'll fly into in Ontario