Puerto Rico

$134+ Cheap flights from Ontario (ONT) to Puerto Rico

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
May 18 — May 251
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Cheap flight deals from Ontario to Puerto Rico

Cheapest flights from Ontario to Puerto Rico
Explore the most affordable flight options available from Ontario to Puerto Rico. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 18, 2026.

This Priceline deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/2011:16 pm
ONT
-
SJU
1 stop11h 56m
Multiple Airlines
Wed 6/246:25 am
SJU
-
ONT
1 stop13h 23m
Multiple Airlines
Deal found 4/14$358
This Kiwi.com deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/138:30 am
ONT
-
SJU
1 stop26h 02m
Multiple Airlines
Sat 5/238:32 am
SJU
-
ONT
2 stops25h 36m
Multiple Airlines
Deal found 4/13$363
This Southwest deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/114:45 pm
ONT
-
SJU
2 stops15h 15m
Southwest
Wed 8/195:15 am
SJU
-
ONT
2 stops11h 50m
Southwest
Deal found 4/15$374
This American Airlines deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:02 pm
ONT
-
SJU
2 stops14h 33m
American Airlines
Mon 9/217:05 pm
SJU
-
ONT
2 stops17h 24m
American Airlines
Deal found 4/13$379
This American Airlines deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:59 pm
ONT
-
SJU
1 stop11h 55m
American Airlines
Tue 9/87:14 pm
SJU
-
ONT
2 stops17h 15m
American Airlines
Deal found 4/14$399
This Kiwi.com deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1310:50 am
ONT
-
SJU
2 stops34h 07m
Frontier
Fri 5/226:25 am
SJU
-
ONT
1 stop15h 46m
Frontier
Deal found 4/13$400
This Kiwi.com deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:06 pm
ONT
-
SJU
2 stops25h 15m
Multiple Airlines
Thu 5/212:37 pm
SJU
-
ONT
1 stop31h 34m
Multiple Airlines
Deal found 4/16$401
This Kiwi.com deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1610:50 am
ONT
-
SJU
2 stops34h 31m
Frontier
Fri 5/226:25 am
SJU
-
ONT
1 stop15h 46m
Frontier
Deal found 4/13$402
This Delta deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1510:00 pm
ONT
-
SJU
1 stop11h 01m
Delta
Fri 5/222:48 pm
SJU
-
ONT
1 stop10h 00m
Delta
Deal found 4/13$404
This Kiwi.com deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1410:50 am
ONT
-
SJU
2 stops27h 36m
Frontier
Fri 5/226:25 am
SJU
-
ONT
1 stop15h 46m
Frontier
Deal found 4/13$406
This Kiwi.com deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1410:50 am
ONT
-
SJU
2 stops27h 36m
Frontier
Sat 5/236:25 am
SJU
-
ONT
1 stop13h 39m
Frontier
Deal found 4/13$408
This Delta deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2710:59 pm
ONT
-
SJU
1 stop9h 57m
Delta
Tue 9/11:06 pm
SJU
-
ONT
2 stops13h 38m
Delta
Deal found 4/16$418

Find flight deals from Ontario to Puerto Rico

Keep the following information in mind while searching for Ontario to Puerto Rico flight deals. Data was last updated April 18, 2026.

Round-trip from

$358
(Priceline)

One-way from

$134
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$429
From Ontario to Puerto Rico
One-way flight from Ontario to Puerto Rico
Highest demand for flights based on searches. 6% potential increase in price ($32 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Average for round-trip flights in April 2026

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Puerto Rico that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 18, 2026.
Use the filters below to find and compare flights from Ontario to Puerto Rico that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 8/11

4:45 pm-11:00 am

2 stops15h 15m

San Juan Luis Munoz Marin Intl

Wed 8/19

5:15 am-2:05 pm

2 stops11h 50m

$374

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 6/6

10:41 pm-1:16 pm

1 stop11h 35m

San Juan Luis Munoz Marin Intl

Wed 6/10

6:25 am-4:48 pm

1 stop13h 23m

$423

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 5/6

5:00 am-8:38 pm

2 stops12h 38m

San Juan Luis Munoz Marin Intl

Thu 5/7

1:00 am-12:22 pm

2 stops14h 22m

$447

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 4/28

7:05 am-11:13 pm

1 stop13h 08m

San Juan Luis Munoz Marin Intl

Sat 5/2

12:55 pm-9:00 pm

1 stop11h 05m

$490

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 4/28

6:15 am-9:05 pm

2 stops11h 50m

San Juan Luis Munoz Marin Intl

Sat 5/2

11:15 am-9:20 pm

2 stops13h 05m

$490

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 5/9

5:00 am-8:38 pm

2 stops12h 38m

San Juan Luis Munoz Marin Intl

Thu 5/14

2:55 pm-9:58 pm

1 stop10h 03m

$524

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 5/15

10:10 am-11:55 pm

2 stops10h 45m

San Juan Luis Munoz Marin Intl

Fri 5/22

5:05 am-3:15 pm

2 stops13h 10m

$555

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 9/16

7:00 am-10:00 pm

1 stop12h 00m

San Juan Luis Munoz Marin Intl

Sun 9/20

7:30 am-6:01 pm

1 stop13h 31m

$580

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 5/2

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Wed 5/6

7:00 am-5:52 pm

2 stops13h 52m

$580

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 9/16

5:00 am-8:38 pm

2 stops12h 38m

San Juan Luis Munoz Marin Intl

Wed 9/23

2:20 pm-9:59 pm

1 stop10h 39m

$605

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/13

Showing 1-10 of 29 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Puerto Rico

Have a flexible travel schedule? Discover the best time to fly to Puerto Rico from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Puerto Rico

What is the cheapest month to book a flight from Ontario to Puerto Rico?

Currently, November is the cheapest month in which you can book a flight from Ontario to Puerto Rico (average of $120). Flying from Ontario to Puerto Rico in July is currently the most expensive (average of $427). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Puerto Rico

Get insights into the airlines that provide service to Puerto Rico. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Puerto Rico. Reviews last updated April 18, 2026.
Read through reviews of airlines operating flights from Ontario to Puerto Rico, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Puerto Rico. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly from for flights from Ontario to Puerto Rico?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Puerto Rico. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • How long is the flight from Ontario to Puerto Rico?

    Departing from Ontario to Puerto Rico will take you 12h 38m. There are 3334 mi between Ontario and Puerto Rico. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Ontario to Puerto Rico one-way?

    One-way options have recently been found by users for as low as $142 on United Airlines. Other airlines that offer cheap prices include Southwest from $178 and American Airlines from $230 one-way.

  • Can I find deals for flights from Ontario to Puerto Rico that include hotel bookings?

    Yes. In addition to deals on Ontario to Puerto Rico flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Puerto Rico?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Puerto Rico.

  • Can I find deals for business class flights from Ontario to Puerto Rico?

    Yes. Cheapflights offers flight deals from Ontario to Puerto Rico by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Puerto Rico?

    Currently, November is the cheapest month in which you can book a flight from Ontario to Puerto Rico (average of $120). Flying from Ontario to Puerto Rico in July is currently the most expensive (average of $427). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Ontario to Puerto Rico

Discover the top 6 airlines that operate flights from Ontario to Puerto Rico. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$137Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$292Average$597FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$321Average$553FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$360Average$577FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$445Average$555FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$455Average$492FlexibilityNo cancel feeOn-time62%

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