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Puerto Rico

$128+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
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 December 4, 2025.

This Frontier deal was found by Cheapflights users on 12/2. 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 12/184:16 pmONT - SJU
1 stop10h 18mFrontier
Mon 12/227:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/2$373
This United Airlines deal was found by Cheapflights users on 12/1. 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.
Sun 12/145:05 amONT - SJU
2 stops11h 55mUnited Airlines
Fri 12/193:46 pmSJU - ONT
1 stop10h 06mUnited Airlines
Deal found 12/1$429
This CheapOair deal was found by Cheapflights users on 12/1. 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.
Thu 12/184:16 pmONT - SJU
1 stop10h 18mFrontier
Mon 12/297:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/1$465
This Kiwi.com deal was found by Cheapflights users on 12/2. 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.
Fri 12/266:20 pmONT - SJU
2 stops25h 55mFrontier
Sun 1/117:05 pmSJU - ONT
1 stop22h 34mFrontier
Deal found 12/2$488
This United Airlines deal was found by Cheapflights users on 12/1. 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 12/45:05 amONT - SJU
2 stops13h 17mUnited Airlines
Mon 12/83:46 pmSJU - ONT
1 stop10h 03mUnited Airlines
Deal found 12/1$494
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/246:20 pmONT - SJU
2 stops37h 59mMultiple Airlines
Wed 12/311:22 pmSJU - ONT
1 stop23h 31mMultiple Airlines
Deal found 12/2$508
This United Airlines deal was found by Cheapflights users on 12/3. 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 12/105:05 amONT - SJU
1 stop9h 20mUnited Airlines
Wed 12/177:45 amSJU - ONT
2 stops13h 50mUnited Airlines
Deal found 12/3$519
This Frontier deal was found by Cheapflights users on 12/2. 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
Sat 12/277:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/2$524
This United Airlines deal was found by Cheapflights users on 12/2. 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 12/176:00 amONT - BQN
2 stops13h 57mUnited Airlines
Sat 12/201:09 amBQN - ONT
3 stops15h 29mUnited Airlines
Deal found 12/2$742
This United Airlines deal was found by Cheapflights users on 12/4. 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 12/86:00 amONT - BQN
2 stops13h 57mUnited Airlines
Tue 12/91:09 amBQN - ONT
2 stops15h 23mUnited Airlines
Deal found 12/4$799
This United Airlines deal was found by Cheapflights users on 12/4. 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 12/115:05 amONT - BQN
2 stops14h 52mUnited Airlines
Fri 12/121:09 amBQN - ONT
2 stops15h 09mUnited Airlines
Deal found 12/4$870
This United Airlines deal was found by Cheapflights users on 12/1. 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 12/205:05 amONT - BQN
2 stops14h 52mUnited Airlines
Fri 12/261:09 amBQN - ONT
2 stops25h 16mUnited Airlines
Deal found 12/1$1,558

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 4, 2025.

Round-trip from

$283
(United Airlines)

One-way from

$128
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$585
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 ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 4, 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

Sun 1/18

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Wed 1/21

3:46 pm-9:58 pm

1 stop10h 12m

$318

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 2/23

10:20 pm-1:04 pm

1 stop10h 44m

San Juan Luis Munoz Marin Intl

Tue 3/3

6:15 am-12:02 pm

1 stop9h 47m

$367

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 2/24

5:00 am-6:25 pm

1 stop9h 25m

San Juan Luis Munoz Marin Intl

Wed 2/25

2:05 am-5:41 pm

3 stops19h 36m

$373

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 2/22

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Thu 2/26

2:25 pm-8:50 pm

1 stop10h 25m

$373

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 2/14

5:00 am-10:22 pm

2 stops13h 22m

San Juan Luis Munoz Marin Intl

Fri 2/20

2:25 pm-8:50 pm

1 stop10h 25m

$412

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 5/12

5:00 am-5:30 pm

1 stop9h 30m

San Juan Luis Munoz Marin Intl

Wed 5/20

2:55 pm-9:21 pm

1 stop9h 26m

$431

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 1/22

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Thu 1/29

3:46 pm-9:58 pm

1 stop10h 12m

$484

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Mon 1/26

6:00 am-11:57 pm

2 stops13h 57m

Aguadilla Borinquen

Thu 1/29

1:09 am-8:58 pm

3 stops23h 49m

$494

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 2/24

8:00 am-9:26 pm

1 stop9h 26m

San Juan Luis Munoz Marin Intl

Sat 2/28

7:45 am-9:59 pm

1 stop18h 14m

$523

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 3/2

6:37 pm-2:40 pm

2 stops16h 03m

San Juan Luis Munoz Marin Intl

Thu 3/5

2:05 am-10:25 pm

2 stops24h 20m

$523

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 35 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, April is the cheapest month in which you can book a flight from Ontario to Puerto Rico (average of $128). 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 4, 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 4, 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
4,250 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

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
4,250 reviews
Southwest
8.0
Very good
4,250 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

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
8,011 reviews
Southwest
8.0
Very good
4,250 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

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
9,066 reviews
Southwest
8.0
Very good
4,250 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

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
7.2
Good
11,047 reviews
Southwest
8.0
Very good
4,250 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

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
5.8
Fair
3,091 reviews
Southwest
8.0
Very good
4,250 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

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 10h 44m. 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 $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 $128). 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

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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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$355Average$530FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$355Average$564FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$365Average$609FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$480Average$617FlexibilityNo cancel feeOn-time63%

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