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Puerto Rico

$171+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
1 adult, Economy
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Cheap 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 septiembre 17, 2025.

Round-trip from

$310
(Frontier)

One-way from

$171
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$445
From Ontario to Puerto Rico
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One-way flight from Ontario to Puerto Rico
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Highest demand for flights based on searches. 11% potential increase in price ($59 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 septiembre 17, 2025.

This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/205:15 pmONT - SJU
2 stops19h 09mFrontier
mié. 10/221:59 amSJU - ONT
2 stops16h 33mFrontier
Deal found 9/15$310
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/258:34 amONT - SJU
2 stops14h 56mFrontier
vie. 11/79:00 amSJU - ONT
2 stops13h 28mFrontier
Deal found 9/16$333
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/317:44 pmONT - SJU
2 stops12h 35mFrontier
mié. 11/59:00 amSJU - ONT
2 stops18h 50mFrontier
Deal found 9/16$349
This American Airlines deal was found by Cheapflights users on 9/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/110:37 pmONT - SJU
1 stop19h 21mAmerican Airlines
mié. 11/57:15 amSJU - ONT
1 stop10h 47mAmerican Airlines
Deal found 9/16$355
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/77:44 pmONT - SJU
2 stops18h 10mFrontier
vie. 11/142:11 amSJU - ONT
2 stops12h 59mFrontier
Deal found 9/15$356
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/147:44 pmONT - SJU
2 stops18h 10mFrontier
sáb. 11/152:11 amSJU - ONT
2 stops16h 34mFrontier
Deal found 9/16$357
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/67:39 amONT - SJU
2 stops13h 53mFrontier
sáb. 11/83:59 amSJU - ONT
2 stops18h 50mFrontier
Deal found 9/14$360
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/236:54 pmONT - SJU
2 stops17h 30mFrontier
dom. 10/263:40 amSJU - ONT
2 stops15h 48mFrontier
Deal found 9/14$366
This Frontier deal was found by Cheapflights users on 9/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/226:53 amONT - SJU
2 stops16h 37mFrontier
vie. 10/246:22 amSJU - ONT
2 stops20h 28mFrontier
Deal found 9/17$368
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/264:08 pmONT - SJU
2 stops19h 03mFrontier
dom. 9/289:26 pmSJU - ONT
2 stops19h 34mFrontier
Deal found 9/15$372
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/226:53 amONT - BQN
2 stops16h 11mFrontier
sáb. 10/252:59 amBQN - ONT
2 stops15h 33mFrontier
Deal found 9/15$402
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/236:54 pmONT - BQN
2 stops28h 10mFrontier
dom. 10/262:59 amBQN - ONT
2 stops11h 48mFrontier
Deal found 9/16$404

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 septiembre 17, 2025.
Use the filters below to find and compare flights from Ontario to Puerto Rico that are best for you.

Fly from

Ontario

Fly to

Puerto Rico

Route

Depart

Return

Price

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

mié. 10/22

6:53 am-2:04 am

2 stops16h 11m

Aguadilla Borinquen

sáb. 10/25

2:59 am-3:32 pm

2 stops15h 33m

$402

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

vie. 10/10

5:15 pm-10:08 am

2 stops13h 53m

Aguadilla Borinquen

vie. 11/14

3:59 am-11:10 am

2 stops11h 11m

$417

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

lun. 11/17

6:38 pm-12:49 pm

2 stops14h 11m

San Juan Luis Munoz Marin Intl

jue. 12/4

2:25 pm-8:42 pm

1 stop10h 17m

$445

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

mar. 10/28

5:05 am-5:25 pm

1 stop9h 20m

San Juan Luis Munoz Marin Intl

jue. 11/6

2:25 pm-8:44 pm

1 stop10h 19m

$445

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

vie. 10/3

10:56 pm-12:42 pm

1 stop10h 46m

San Juan Luis Munoz Marin Intl

vie. 10/24

1:25 pm-9:29 pm

1 stop11h 04m

$450

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

mié. 10/1

6:36 pm-1:45 pm

2 stops16h 09m

San Juan Luis Munoz Marin Intl

mié. 10/8

7:00 am-5:23 pm

2 stops13h 23m

$470

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

mié. 10/15

6:00 am-8:38 pm

1 stop11h 38m

San Juan Luis Munoz Marin Intl

mié. 10/22

2:00 pm-8:24 pm

1 stop9h 24m

$480

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

mié. 1/7

7:00 am-9:00 pm

1 stop10h 00m

San Juan Luis Munoz Marin Intl

sáb. 1/17

10:15 am-10:53 pm

2 stops16h 38m

$480

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

jue. 10/30

7:00 am-8:00 pm

1 stop10h 00m

San Juan Luis Munoz Marin Intl

sáb. 11/1

6:45 am-8:44 pm

2 stops16h 59m

$480

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

vie. 10/31

5:05 am-5:25 pm

1 stop9h 20m

San Juan Luis Munoz Marin Intl

lun. 11/3

2:25 pm-8:44 pm

1 stop10h 19m

$496

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 30 results
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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, September is the cheapest month in which you can book a flight from Ontario to Puerto Rico (average of $254). Flying from Ontario to Puerto Rico in June is currently the most expensive (average of $339). 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.

What is the cheapest time of day to fly from ONT to PR?

Find hourly flight availability from Ontario to Puerto Rico. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Puerto Rico as you normally would.

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 septiembre 17, 2025.
Read through reviews of airlines operating flights from Ontario to Puerto Rico, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,961 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,173 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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 10h 46m. 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 $178 on Delta. Other airlines that offer cheap prices include JetBlue from $190 and United Airlines from $248 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, September is the cheapest month in which you can book a flight from Ontario to Puerto Rico (average of $254). Flying from Ontario to Puerto Rico in June is currently the most expensive (average of $339). 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

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Alternative routes for Ontario to Puerto Rico

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Puerto Rico

Discover the top 5 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 septiembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$467FlexibilityNo cancel feeOn-time62%
DeltaCheapest$355Average$534FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$365Average$609FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$366Average$596FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$409Average$575FlexibilityNo cancel feeOn-time63%

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