SJU - ONT

$143 Find Cheap Flights from San Juan to Ontario

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 11/22. 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
$355
Overall average: $664
American Airlines
Wed 1/21Sat 1/24
SJU - ONT • 2 stops
Cheapest one-way
$141
Typical prices: $343-$377
Frontier
Sat 11/22
SJU - ONT • 2 stops
Top airlines
American Airlines
Cheapest • from $355 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
July
Cheapest • 31% price drop
May
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 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

Wed, Jan 21 - Sat, Jan 24
American Airlines Logo
6:00 am - 6:20 pmSJU-ONT
16h 20m2 stops
American Airlines Logo
6:00 am - 11:59 pmONT-SJU
13h 59m2 stops
$355American Airlines
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Wed, Jan 21 - Sat, Jan 24
American Airlines Logo
7:07 am - 6:45 pmSJU-ONT
15h 38m1 stop
American Airlines Logo
6:00 am - 10:26 pmONT-SJU
12h 26m1 stop
$414American Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
American Airlines Logo
6:42 pm - 9:54 amSJU-ONT
19h 12m2 stops
American Airlines Logo
12:55 pm - 10:09 amONT-SJU
17h 14m2 stops
$423American Airlines
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Thu, Feb 12 - Mon, Feb 23
Delta Logo
6:15 am - 11:59 amSJU-ONT
9h 44m1 stop
Delta Logo
10:20 pm - 1:00 pmONT-SJU
10h 40m1 stop
$435Delta
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Wed, Dec 24 - Thu, Jan 1
American Airlines Logo
6:44 am - 1:52 pmSJU-ONT
11h 08m1 stop
American Airlines Logo
7:18 pm - 9:35 amONT-SJU
10h 17m2 stops
$440American Airlines
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Fri, Feb 13 - Tue, Feb 24
United Airlines Logo
2:25 pm - 8:50 pmSJU-ONT
10h 25m1 stop
United Airlines Logo
5:00 am - 6:25 pmONT-SJU
9h 25m1 stop
$445United Airlines
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Sat, Feb 14 - Mon, Feb 23
Delta Logo
6:15 am - 11:59 amSJU-ONT
9h 44m1 stop
Delta Logo
10:20 pm - 1:00 pmONT-SJU
10h 40m1 stop
$460Delta
Find Deal
Wed, Dec 24 - Thu, Jan 1
American Airlines Logo
8:25 am - 8:58 pmSJU-ONT
16h 33m1 stop
American Airlines Logo
6:10 am - 5:34 amONT-SJU
19h 24m1 stop
$480American Airlines
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Wed, Dec 3 - Wed, Dec 10
American Airlines Logo
6:42 pm - 9:54 amSJU-ONT
19h 12m2 stops
American Airlines Logo
4:47 pm - 1:05 pmONT-SJU
16h 18m2 stops
$482American Airlines
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Thu, Apr 30 - Fri, May 8
JetBlue Logo
1:50 pm - 10:09 pmSJU-ONT
11h 19m1 stop
JetBlue Logo
11:25 pm - 1:47 pmONT-SJU
11h 22m1 stop
$497JetBlue
Find Deal
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.

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

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

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

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 July, where tickets cost $333 (return) on average. On the other hand, the most expensive months are January and December, where the average cost of round-trip tickets is $664 and $593 respectively.

Good to know

Low seasonMarch
Cheapest flight$141
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly with an average 2% increase in price.
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 3 days, the lowest price for a flight from San Juan Luis Munoz Marin Intl Airport to Ontario was $141 for a one-way ticket and $355 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, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from San Juan to Ontario are United Airlines and American Airlines. With an average price for the route of $734 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $685 and an overall rating of 7.2.

  • 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 airlines flying 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.
7.4
United AirlinesOverall score based on 9016 reviews
8.1Crew
7.3Comfort
7.1Entertainment
6.6Food
7.7Boarding
Airline reviews

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

4.0 OkayThomas, Nov 2025SEA - SFO
Read more United Airlines reviews

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

The flight attendants were very rude, beyond comprehension. I took a business class from London to SFO for the first time on United. When I asked for a second piece of bread during dinner, the serving attendant threw a 3rd bread on my plate and said, “here. You can have this one too”! I couldn’t believe the rudeness of the attendant. Most all attendants were very rude, unhelpful, sing the food was absolutely disgusting. Never fly United internationally in business class. My flight back to SFO was a nightmare!!

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The food quality sucks. One must starve if they do not eat flesh Or wheat based products Some variety would be expected. The trivial amount of snacks and or food is inhumane

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

Subject: Formal Complaint: Discriminatory and Unprofessional Conduct – Request for Immediate Action & Compensation Dear [Airline Customer Relations Team], I am writing to file a formal complaint regarding my recent travel experience with [Airline], which was by far the worst I have ever encountered. What occurred was not only unprofessional, but in several instances discriminatory, unsafe, and unacceptable. On the first leg of my trip, I arrived only four minutes past check-in. Instead of making any attempt to resolve the matter, your representative flatly denied me boarding and made me wait while she attended to passengers who arrived after me. By the time a manager intervened, it was too late to board, costing me time, money, and unnecessary frustration. The second leg of my trip (Chicago–San Francisco) raised even more serious concerns. From the outset, it was apparent that the staff—particularly two attendants—prioritized Caucasian passengers while dismissing African American and minority passengers. • When a Caucasian passenger in the exit row refused to comply with federal safety requirements, I, as a first responder, immediately offered to switch seats and assume the responsibility. My offer was blatantly ignored, and instead, a Caucasian passenger seated further up was chosen. This was discriminatory and deeply insulting, especially as I was actively de-escalating the situation that could have delayed the flight further. • During a lengthy tarmac delay of over 90 minutes, passengers were given conflicting and unreasonable instructions that created unnecessary distress and tension. • Throughout the flight, a visibly intoxicated passenger directly in front of me was disruptive, rude to others, failed to comply with seatbelt and electronic device rules, and yet faced no enforcement from the crew. In stark contrast, I was singled out for repeated compliance checks even though I was following every rule. This unequal treatment was so obvious that multiple passengers around me spoke up in my defense. This pattern of behavior demonstrated a clear lack of professionalism, disregard for passenger safety, and discriminatory treatment. I expect far better from an airline of your stature. As a paying customer subjected to this unacceptable treatment, I am formally requesting: 1. A full investigation into the conduct of the staff on both flights. 2. A written apology acknowledging the discriminatory and unprofessional behavior I endured. 3. Appropriate compensation for the distress, inconvenience, and mishandling of my travel. If this matter is not addressed promptly and thoroughly, I will have no choice but to escalate my complaint further, including filing with the U.S. Department of Transportation and sharing my experience through other channels. I trust [Airline] will take this complaint seriously and provide a timely resolution.

Check in was quick and easy during early hours. Flight was on time, and customer services was a plus.

The experience with American Airlines was good, although the Philippines Airlines flight was much better (better seats, better food, better entertainment options, overall better). Again, the MIA to LAX flight was fine, but nothing in comparison to the comfort and accommodations of the Philippines Airlines flight from LAX to MNL.

Loved the crew . Absolutely no complaints. Except for luggage lost

Wish some foods provided rather than just biscuit/cookie for flight more than 2 hours

We are too tired and frustrated to comment politely at this point

The business class seats are dated and uncomfortable. The space is bare minimum and there is absolutely no privacy. For $4K, this is not what I expect.

The flight crew was rude. We were in first class and no one even offered water until an hour after we were in the air. Horrible experience

Great. Quick and quiet and east. The breakfast choices were a welcome surprise!

The stewardess hit me with the food kart twice on the head and didn't say I'm sorry once. The same stewardess gave me a warm Apple Juice with No ice. The Flight was delayed for Departure 6 times, starting from 2:36pm, finally taking off 7:50pm. I was late picking up my child from the sitter by 3 hours.

Did not get the seat I selected and paid for.

My flight was delayed for several hours. Sitting at gate 16 for several hours, I got a text from Kayak the gate changed to 9 before it was announced. Very bad communication at each gate from American Airlines employees. I received 10 notifications of delay from Kayak. My vacation started off horrible! I will write to American Airlines corporate office also.

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

Information on your arrival and departure airports