SJU - ONT

$123 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 5/23. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$354
Typical prices: $472-$386
United Airlines
Thu 4/30Sun 5/3
SJU - ONT • 2 stops
Cheapest one-way
$123
Typical prices: $184-$300
Frontier
Sat 5/23
SJU - ONT • 1 stop
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 San Juan and Ontario. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $389 (round-trip)
Shortest trip • 9h 42m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 14 weeks in advance save around 48% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 34% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Thu, Apr 30 - Sun, May 3
United Airlines Logo
7:20 am - 10:35 pm
SJU
-
ONT
18h 15m
2 stops
United Airlines Logo
5:00 am - 5:38 pm
ONT
-
SJU
9h 38m
1 stop
$354United Airlines
Sat, Apr 18 - Sun, Apr 19
Multiple Airlines Logo
5:45 am - 10:37 pm
SJU
-
ONT
19h 52m
1 stop
Multiple Airlines Logo
12:59 am - 2:01 am
ONT
-
SJU
22h 02m
2 stops
$363Multiple Airlines
Thu, Apr 30 - Sun, May 3
Multiple Airlines Logo
3:31 pm - 4:38 pm
SJU
-
ONT
28h 07m
2 stops
Multiple Airlines Logo
4:29 pm - 1:32 pm
ONT
-
SJU
18h 03m
1 stop
$375Multiple Airlines
Thu, Apr 23 - Sat, May 9
Delta Logo
7:30 am - 6:33 pm
SJU
-
ONT
14h 03m
1 stop
Delta Logo
10:00 pm - 12:01 pm
ONT
-
SJU
11h 01m
1 stop
$394Delta
Sat, Apr 11 - Wed, Apr 15
Multiple Airlines Logo
6:55 pm - 8:04 am
SJU
-
ONT
40h 09m
2 stops
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
$399Multiple Airlines
Thu, Apr 30 - Sun, May 3
American Airlines Logo
11:43 am - 9:07 pm
SJU
-
ONT
12h 24m
2 stops
American Airlines Logo
7:35 pm - 10:48 am
ONT
-
SJU
12h 13m
2 stops
$402American Airlines
Thu, Apr 30 - Sun, May 3
American Airlines Logo
11:43 am - 9:07 pm
SJU
-
ONT
12h 24m
2 stops
American Airlines Logo
7:35 pm - 10:48 am
ONT
-
SJU
12h 13m
2 stops
$411American Airlines
Mon, Sep 7 - Mon, Sep 21
Southwest Logo
5:00 am - 2:00 pm
SJU
-
ONT
12h 00m
2 stops
Southwest Logo
10:00 am - 11:50 pm
ONT
-
SJU
10h 50m
2 stops
$412Southwest
Fri, Apr 17 - Tue, Apr 21
Multiple Airlines Logo
7:00 am - 11:58 pm
SJU
-
ONT
19h 58m
2 stops
Multiple Airlines Logo
8:15 am - 11:10 pm
ONT
-
SJU
11h 55m
1 stop
$423Multiple Airlines
Fri, May 1 - Fri, May 8
Delta Logo
12:55 pm - 9:00 pm
SJU
-
ONT
11h 05m
1 stop
Delta Logo
10:00 pm - 12:01 pm
ONT
-
SJU
11h 01m
1 stop
$425Delta
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.

How much is a round-trip flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from San Juan Luis Munoz Marin Intl Airport to Ontario departing in April.

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 January, where tickets cost $288 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $556 and $555 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure 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 average of all the values for each week.

To get a below average price on the flight from San Juan Luis Munoz Marin Intl Airport to Ontario, you should book around 14 weeks before departure, which saves you about 48% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low seasonMarch
Cheapest flight$123
Best time to beat the crowds but there is an average 26% increase in price.
Most popular time to fly and prices are also 4% lower on average.
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 $123 for a one-way ticket and $354 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, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from San Juan to Ontario are Southwest and United Airlines. With an average price for the route of $430 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $520 and an overall rating of 7.4.

  • 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 3 airlines serving 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.
8.0
SouthwestOverall score based on 4332 reviews
7.5Entertainment
8.6Crew
8.1Boarding
8.0Comfort
7.0Food
Airline reviews

Boarding was easy. The seats are small and fairly uncomfortable

8.0 ExcellentNicole, Mar 2026
LGB - OAK
Read more Southwest reviews

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.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

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

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

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

3 hour delay. Had to change plans and was still delayed.

Never went on board this flight. Kayak uses Underpricer (which is a scam business) as it's "customer service provider". This customer service is a classic bait and switch "service". I Got caught in the UnderPricer Bait and switch scam. 14 hours on the phone with people from India with heavy accents and upselling me to useless products. The original sell was a flight on spirit. Then they contact me later, an say after they have my money that the flight is no good as is is only one seat for a party of two. I am still in dispute to get my money back. Went to Spirit direct and had a beautiful vacation. I should never have used Kayak and their rip off artists UnderPricer.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

we did a return flight from Paris CDG to SFO. This trip was much better than the departing flight SFO to CDG. The food was better quality, the crew was nicer, and the interior of the plane seemed cleaner.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

We got to get extended leg room in Econ plus that was great. It was nice having our own dietary needs met with our meals, and the connecting flights had it as well. Only negative were the seats my bottom was/is really sore after a ten plus hour flight. Those seats are horrible, understandable for as many people use them. So we are going to purchase a gel seat pad.

Flight to Japan was was better across the board than the return to USA. Entertainment: Movie selection was old and not to my liking. Way too many woke choices. Not enough selections for sports or drama. Service: some of the crew were great. Not all. I paid for business class. a premium. Some of the crew thought they 'had' t do there job instead of wanting to serve and be polite. Food: Way to Japan was good. Way back to USA bad. Boarding: Wat out did not offer Business only; had to go thru general. If you pay for business, you should get business perks. Suggest you look for other than United for travel to Asia

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

The head flight attendant made the trip excellent. He was very accommodating.

The economy seats on the 777 was not as cramped as I had feared, but the food was terrible.

Terrible experience! delay 2 time and say i dont have ticket

Flight was on time. Cabin attendants made no recognition of my name or being an Advantage Executive Platinum member.

Delayed for mechanical and no updates on what was happening and how long the delay might be.

A first class seat should fit a fat person, and this doesn't. The trays in the armrest are less functional than an ordinary tray in the back of the seat.

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.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

They are always late and seats was also not having working charger

did not have enough meal for first class passengers so offer us snack

We were upgraded to Business Class. So comfortable with great service and food options

The flight was completely full. Crew was not happy. Everyone was rude and brusque. Travelling with an arm in a cast and seating in the first row of economy cabin (in front of the separation) I needed help retrieving my tray for the meal. A staff member literally threw the tray on my lap, without helping to take out the tray. Boarding was messy, with 300 people waiting in an encloses space with low ceiling. I will try to avoid AA next time I have a long flight.

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

Information on your arrival and departure airports