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Puerto Rico

$187+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Jun 11 — Jun 181
Thu 6/11
Thu 6/18
1 adult, Economy
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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 May 12, 2026.

This American Airlines deal was found by Cheapflights users on 5/11. 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.
Fri 9/1811:59 pm
ONT
-
SJU
1 stop12h 03m
American Airlines
Mon 9/217:05 pm
SJU
-
ONT
2 stops17h 24m
American Airlines
Deal found 5/11$374
This American Airlines deal was found by Cheapflights users on 5/8. 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.
Sun 8/238:01 pm
ONT
-
SJU
2 stops15h 37m
American Airlines
Fri 8/286:51 am
SJU
-
ONT
2 stops14h 24m
American Airlines
Deal found 5/8$425
This Delta deal was found by Cheapflights users on 5/11. 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 7/3110:00 pm
ONT
-
SJU
1 stop10h 46m
Delta
Thu 8/62:11 pm
SJU
-
ONT
2 stops12h 23m
Delta
Deal found 5/11$427
This United Airlines deal was found by Cheapflights users on 5/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/105:00 am
ONT
-
SJU
1 stop9h 38m
United Airlines
Tue 8/187:00 am
SJU
-
ONT
2 stops16h 04m
United Airlines
Deal found 5/7$428
This Southwest deal was found by Cheapflights users on 5/7. 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.
Thu 8/206:20 am
ONT
-
SJU
2 stops10h 45m
Southwest
Mon 8/245:00 am
SJU
-
ONT
2 stops13h 15m
Southwest
Deal found 5/7$452
This American Airlines deal was found by Cheapflights users on 5/10. 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.
Mon 12/710:34 pm
ONT
-
SJU
1 stop18h 22m
American Airlines
Sat 12/128:18 am
SJU
-
ONT
2 stops14h 01m
American Airlines
Deal found 5/10$454
This Priceline deal was found by Cheapflights users on 5/9. 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.
Mon 8/1711:50 pm
ONT
-
SJU
1 stop11h 08m
Multiple Airlines
Sat 8/226:25 am
SJU
-
ONT
1 stop13h 23m
Multiple Airlines
Deal found 5/9$463
This United Airlines deal was found by Cheapflights users on 5/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/246:00 am
ONT
-
SJU
1 stop11h 38m
United Airlines
Tue 9/297:00 am
SJU
-
ONT
2 stops16h 16m
United Airlines
Deal found 5/8$464
This Delta deal was found by Cheapflights users on 5/9. 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.
Wed 12/210:59 pm
ONT
-
SJU
1 stop9h 46m
Delta
Tue 12/83:35 pm
SJU
-
ONT
1 stop10h 39m
Delta
Deal found 5/9$465
This Delta deal was found by Cheapflights users on 5/9. 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 11/267:00 am
ONT
-
SJU
1 stop12h 13m
Delta
Thu 12/31:55 pm
SJU
-
ONT
1 stop12h 19m
Delta
Deal found 5/9$480
This American Airlines deal was found by Cheapflights users on 5/7. 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.
Thu 8/208:01 pm
ONT
-
SJU
2 stops14h 42m
American Airlines
Mon 8/247:05 am
SJU
-
ONT
1 stop17h 06m
American Airlines
Deal found 5/7$489
This United Airlines deal was found by Cheapflights users on 5/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:00 am
ONT
-
BQN
2 stops15h 09m
United Airlines
Wed 9/2312:15 am
BQN
-
ONT
2 stops14h 57m
United Airlines
Deal found 5/8$635

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 May 12, 2026.

Round-trip from

$374
(American Airlines)

One-way from

$187
(Delta)

Popular in

December

Cheapest in

October

Average price

$457
From Ontario to Puerto Rico
Search Deals
One-way flight from Ontario to Puerto Rico
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 May 12, 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

Mon 8/10

5:00 am-5:38 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

Tue 8/18

7:00 am-8:04 pm

2 stops16h 04m

$428

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 9/19

5:00 am-5:38 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

Sat 9/26

2:55 pm-9:58 pm

1 stop10h 03m

$494

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 7/6

10:00 pm-11:46 am

1 stop10h 46m

San Juan Luis Munoz Marin Intl

Wed 7/15

12:56 pm-9:50 pm

1 stop11h 54m

$556

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 10/1

6:00 am-8:38 pm

1 stop11h 38m

San Juan Luis Munoz Marin Intl

Thu 10/8

2:00 pm-8:52 pm

1 stop9h 52m

$564

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 8/31

6:00 am-8:38 pm

1 stop11h 38m

San Juan Luis Munoz Marin Intl

Tue 9/1

1:00 am-8:01 pm

2 stops22h 01m

$615

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 6/10

5:45 am-8:38 pm

1 stop11h 53m

San Juan Luis Munoz Marin Intl

Mon 6/15

1:00 am-12:12 pm

2 stops14h 12m

$627
Quickest round-trip

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 7/31

5:00 am-5:38 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

Mon 8/3

1:40 pm-8:42 pm

1 stop10h 02m

$632

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Wed 9/9

5:00 am-11:09 pm

2 stops15h 09m

Aguadilla Borinquen

Wed 9/23

12:15 am-12:12 pm

2 stops14h 57m

$635

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 6/9

5:45 am-8:38 pm

1 stop11h 53m

San Juan Luis Munoz Marin Intl

Sun 6/14

1:00 am-12:12 pm

2 stops14h 12m

$661

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Tue 5/26

10:41 pm-2:57 am

1 stop25h 16m

Aguadilla Borinquen

Sat 5/30

6:30 am-8:47 pm

1 stop17h 17m

$675

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/7

Showing 1-10 of 32 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

How far ahead should I book a flight from Ontario to Puerto Rico?

The price you pay for your flight from Ontario to Puerto Rico may vary depending on when you book. For the best chance of a lower fare, look to book 14 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 May 12, 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.
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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.
Southwest
8.0
Very good
4,295 reviews
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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.
Delta
7.9
Good
8,446 reviews
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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.
United Airlines
7.4
Good
9,701 reviews
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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.
American Airlines
7.1
Good
11,661 reviews
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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.
Frontier
5.6
Fair
2,950 reviews
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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 8h 40m. 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 Delta from $168 and Southwest from $178 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 May 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$137Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$292Average$552FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$321Average$555FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$360Average$577FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$419Average$555FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$455Average$561FlexibilityNo cancel feeOn-time62%

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