HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Puerto Rico

$113+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Puerto Rico with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 December 12, 2025.

This Expedia deal was found by Cheapflights users on 12/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/184:16 pmONT - SJU
1 stop10h 18mFrontier
Mon 12/227:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/9$314
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:41 pmONT - SJU
1 stop9h 53mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/11$324
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/254:16 pmONT - SJU
1 stop10h 18mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/11$344
This Frontier deal was found by Cheapflights users on 12/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/254:16 pmONT - SJU
1 stop10h 18mFrontier
Mon 12/297:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/10$364
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/244:22 pmONT - SJU
1 stop10h 12mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/11$374
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/234:41 pmONT - SJU
1 stop9h 53mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/10$375
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:22 pmONT - SJU
1 stop10h 12mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/11$384
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/244:22 pmONT - SJU
1 stop10h 12mFrontier
Mon 12/297:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/10$395
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/234:41 pmONT - SJU
1 stop9h 53mFrontier
Mon 12/297:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/11$414
This Frontier deal was found by Cheapflights users on 12/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/214:41 pmONT - SJU
1 stop9h 53mFrontier
Mon 12/297:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/11$424

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 December 12, 2025.

Round-trip from

$280
(Kiwi.com)

One-way from

$113
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$575
From Ontario to Puerto Rico
Search Deals
One-way flight from Ontario to Puerto Rico
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($48 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 12, 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

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 1/13

8:00 am-9:26 pm

1 stop9h 26m

San Juan Luis Munoz Marin Intl

Wed 1/21

7:45 am-5:43 pm

2 stops13h 58m

$373

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 1/24

1:53 pm-6:11 am

2 stops12h 18m

San Juan Luis Munoz Marin Intl

Tue 1/27

7:45 am-5:43 pm

2 stops13h 58m

$431

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 2/24

8:00 am-9:26 pm

1 stop9h 26m

San Juan Luis Munoz Marin Intl

Wed 2/25

2:05 am-5:41 pm

3 stops19h 36m

$431

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 4/25

6:00 am-8:38 pm

1 stop11h 38m

San Juan Luis Munoz Marin Intl

Thu 4/30

2:55 pm-9:50 pm

1 stop9h 55m

$431

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 1/26

5:05 am-6:25 pm

1 stop9h 20m

San Juan Luis Munoz Marin Intl

Fri 1/30

3:46 pm-9:58 pm

1 stop10h 12m

$431

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 1/17

1:53 pm-6:11 am

2 stops12h 18m

San Juan Luis Munoz Marin Intl

Sat 1/24

7:45 am-8:58 pm

2 stops17h 13m

$431

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 2/2

11:59 pm-6:22 pm

2 stops14h 23m

San Juan Luis Munoz Marin Intl

Mon 2/9

7:00 am-6:20 pm

2 stops15h 20m

$444

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 2/2

10:30 pm-2:31 pm

1 stop12h 01m

San Juan Luis Munoz Marin Intl

Mon 2/9

2:15 pm-9:05 pm

1 stop10h 50m

$472

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 1/9

6:39 pm-2:40 pm

2 stops16h 01m

San Juan Luis Munoz Marin Intl

Fri 1/16

3:46 pm-9:58 pm

1 stop10h 12m

$484

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Thu 3/5

5:15 am-11:57 pm

2 stops14h 42m

Aguadilla Borinquen

Sun 3/8

12:09 am-12:48 pm

2 stops15h 39m

$595

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 24 results
1
2
3

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, April is the cheapest month in which you can book a flight from Ontario to Puerto Rico (average of $137). Flying from Ontario to Puerto Rico in November is currently the most expensive (average of $286). 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 December 12, 2025.

One of the essential ways to save on airfare from Ontario to Puerto Rico is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 38% on airfare.

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 December 12, 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
7.9
Good
4,253 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

7.9

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
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

7.9

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
8,008 reviews
Southwest
7.9
Good
4,253 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

7.9

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
9,095 reviews
Southwest
7.9
Good
4,253 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

7.9

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
7.2
Good
11,050 reviews
Southwest
7.9
Good
4,253 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

7.9

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
5.8
Fair
3,084 reviews
Southwest
7.9
Good
4,253 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

7.9

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 26m. There are 3334 mi between Ontario and Puerto Rico.

  • 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 $168 on Delta. Other airlines that offer cheap prices include American Airlines from $172 and United Airlines 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, April is the cheapest month in which you can book a flight from Ontario to Puerto Rico (average of $137). Flying from Ontario to Puerto Rico in November is currently the most expensive (average of $286). 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.

Alternative routes for Ontario to Puerto Rico

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Luis Munoz Marin Intl flights
San Francisco to Luis Munoz Marin Intl flights
Los Angeles to Punta Cana flights
San Diego to Luis Munoz Marin Intl flights
Las Vegas to Luis Munoz Marin Intl flights
Ontario to Luis Munoz Marin Intl flights
Los Angeles to Nassau flights
San Francisco to Montego Bay flights
Los Angeles to Montego Bay flights
Sacramento to Luis Munoz Marin Intl flights
Santa Ana to Luis Munoz Marin Intl flights
Burbank to Luis Munoz Marin Intl flights
Ontario to Punta Cana flights
San Francisco to Punta Cana flights
Los Angeles to Simpson Bay flights
Los Angeles to Oranjestad flights
San Jose to Luis Munoz Marin Intl flights
Los Angeles to Santo Domingo flights
Los Angeles to Providenciales flights
Los Angeles to George Town flights
San Francisco to Nassau flights
Los Angeles to Puerto Plata flights
San Francisco to Saint Thomas Island flights
Las Vegas to Montego Bay flights
Los Angeles to Saint Thomas Island flights
San Francisco to Providenciales flights
Los Angeles to Castries flights
San Francisco to Oranjestad flights
Los Angeles to Kingston flights
Oakland to Luis Munoz Marin Intl flights
San Francisco to Christiansted flights
San Francisco to Santo Domingo flights
Los Angeles to Road Town flights
San Diego to Punta Cana flights
San Francisco to Simpson Bay flights
San Diego to Nassau flights
San Francisco to Kingston flights
Ontario to Montego Bay flights
Ontario to Nassau flights
San Francisco to George Town flights
Las Vegas to Nassau flights
San Francisco to Castries flights
San Francisco to Willemstad flights
San Francisco to Port of Spain flights
Fresno to Luis Munoz Marin Intl flights
Las Vegas to Punta Cana flights
Reno to Luis Munoz Marin Intl flights
Los Angeles to Bridgetown flights
San Francisco to St. John's flights
San Luis Obispo to Luis Munoz Marin Intl flights

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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$355Average$530FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$355Average$559FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$365Average$613FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$480Average$617FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.