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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 7/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
May 28 — Jun 41
Thu 5/28
Thu 6/4
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 April 28, 2026.

This Delta deal was found by Cheapflights users on 4/24. 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.
Tue 8/1110:59 pm
ONT
-
SJU
1 stop9h 57m
Delta
Tue 8/182:40 pm
SJU
-
ONT
1 stop10h 16m
Delta
Deal found 4/24$336
This Delta deal was found by Cheapflights users on 4/24. 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 8/1410:59 pm
ONT
-
SJU
1 stop9h 57m
Delta
Wed 8/191:06 pm
SJU
-
ONT
1 stop11h 50m
Delta
Deal found 4/24$374
This Delta deal was found by Cheapflights users on 4/24. 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.
Tue 8/1110:59 pm
ONT
-
SJU
1 stop9h 57m
Delta
Wed 8/192:40 pm
SJU
-
ONT
1 stop10h 16m
Delta
Deal found 4/24$398
This American Airlines deal was found by Cheapflights users on 4/25. 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 9/511:59 pm
ONT
-
SJU
1 stop11h 55m
American Airlines
Sat 9/126:30 am
SJU
-
ONT
2 stops19h 36m
American Airlines
Deal found 4/25$399
This Delta deal was found by Cheapflights users on 4/24. 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 8/1210:59 pm
ONT
-
SJU
1 stop9h 57m
Delta
Wed 8/197:30 am
SJU
-
ONT
2 stops11h 44m
Delta
Deal found 4/24$413
This American Airlines deal was found by Cheapflights users on 4/28. 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 9/188:02 pm
ONT
-
SJU
2 stops14h 33m
American Airlines
Mon 9/217:05 pm
SJU
-
ONT
2 stops17h 24m
American Airlines
Deal found 4/28$414
This United Airlines deal was found by Cheapflights users on 4/23. 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 9/285:00 am
ONT
-
SJU
1 stop9h 38m
United Airlines
Tue 10/62:55 pm
SJU
-
ONT
1 stop10h 03m
United Airlines
Deal found 4/23$419
This Priceline deal was found by Cheapflights users on 4/24. 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 6/810:41 pm
ONT
-
SJU
1 stop16h 10m
Multiple Airlines
Sat 6/136:25 am
SJU
-
ONT
1 stop13h 23m
Multiple Airlines
Deal found 4/24$421
This Southwest deal was found by Cheapflights users on 4/26. 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.
Wed 8/54:45 pm
ONT
-
SJU
2 stops15h 10m
Southwest
Sat 8/156:25 am
SJU
-
ONT
2 stops11h 05m
Southwest
Deal found 4/26$422
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Sat 8/85:00 am
ONT
-
SJU
1 stop9h 38m
United Airlines
Mon 8/172:20 pm
SJU
-
ONT
1 stop10h 39m
United Airlines
Deal found 4/27$427
This deal was found by Cheapflights users on 4/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:00 am
ONT
-
SJU
1 stop12h 23m
Delta
Thu 8/201:06 pm
SJU
-
ONT
1 stop11h 50m
Delta
Deal found 4/24$432
This Kiwi.com deal was found by Cheapflights users on 4/28. 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 5/169:15 am
ONT
-
SJU
1 stop25h 17m
Multiple Airlines
Sat 5/238:32 am
SJU
-
ONT
2 stops25h 36m
Multiple Airlines
Deal found 4/28$435

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 28, 2026.

Round-trip from

$336
(Delta)

One-way from

$187
(Delta)

Popular in

December

Cheapest in

October

Average price

$430
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 ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 28, 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

Sat 9/5

5:00 am-5:38 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

Sat 9/12

2:55 pm-9:59 pm

1 stop10h 04m

$478

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 8/20

7:13 pm-3:42 pm

2 stops17h 29m

San Juan Luis Munoz Marin Intl

Tue 8/25

7:00 am-6:11 pm

2 stops14h 11m

$494

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 8/13

7:13 pm-3:42 pm

2 stops17h 29m

San Juan Luis Munoz Marin Intl

Tue 8/18

7:00 am-8:04 pm

2 stops16h 04m

$494

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 9/24

6:00 am-8:38 pm

1 stop11h 38m

San Juan Luis Munoz Marin Intl

Tue 9/29

2:55 pm-9:58 pm

1 stop10h 03m

$524
Quickest round-trip

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

$534

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 10/18

5:00 am-5:38 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

Wed 10/21

2:55 pm-9:58 pm

1 stop10h 03m

$534

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 5/25

9:55 pm-1:10 pm

1 stop12h 15m

San Juan Luis Munoz Marin Intl

Mon 6/1

5:35 am-3:15 pm

1 stop12h 40m

$550

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 6/9

1:05 pm-12:45 am

1 stop8h 40m

San Juan Luis Munoz Marin Intl

Sat 6/20

5:00 am-7:15 pm

1 stop17h 15m

$606

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 5/16

6:10 am-9:25 pm

2 stops12h 15m

San Juan Luis Munoz Marin Intl

Sat 5/23

11:15 am-9:20 pm

2 stops13h 05m

$636

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Sat 8/22

7:00 am-11:09 pm

2 stops13h 09m

Aguadilla Borinquen

Tue 8/25

12:15 am-12:38 pm

2 stops15h 23m

$662

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/24

Showing 1-10 of 29 resultsSorted by cheapest first
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2
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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 April 28, 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
4,314 reviews

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
4,314 reviews
Southwest
8.0
Very good
4,314 reviews

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
8,467 reviews
Southwest
8.0
Very good
4,314 reviews

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
9,672 reviews
Southwest
8.0
Very good
4,314 reviews

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
11,677 reviews
Southwest
8.0
Very good
4,314 reviews

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
5.7
Fair
2,970 reviews
Southwest
8.0
Very good
4,314 reviews

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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 9h 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 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$137Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$292Average$552FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$321Average$553FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$360Average$577FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$419Average$556FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$455Average$467FlexibilityNo cancel feeOn-time62%

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