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Puerto Rico

$142+ 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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
maalis 10 — maalis 171
ti 3/10
ti 3/17
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 helmikuu 8, 2026.

This United Airlines deal was found by Cheapflights users on 2/4. 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.
ti 11/105:00 am
ONT
-
SJU
1 stop9h 25m
United Airlines
pe 11/132:05 am
SJU
-
ONT
2 stops14h 28m
United Airlines
Deal found 2/4$284
This Kiwi.com deal was found by Cheapflights users on 2/6. 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.
ke 4/222:44 pm
ONT
-
SJU
2 stops23h 46m
Multiple Airlines
ti 4/286:49 pm
SJU
-
ONT
1 stop28h 50m
Multiple Airlines
Deal found 2/6$365
This American Airlines deal was found by Cheapflights users on 2/7. 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.
pe 9/1811:59 pm
ONT
-
SJU
1 stop11h 04m
American Airlines
ma 9/217:05 pm
SJU
-
ONT
2 stops17h 12m
American Airlines
Deal found 2/7$371
This United Airlines deal was found by Cheapflights users on 2/4. 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.
la 4/256:05 am
ONT
-
SJU
1 stop11h 33m
United Airlines
la 5/27:40 am
SJU
-
ONT
1 stop13h 21m
United Airlines
Deal found 2/4$374
This Kiwi.com deal was found by Cheapflights users on 2/5. 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.
to 3/52:08 pm
ONT
-
SJU
2 stops32h 50m
Multiple Airlines
ma 3/96:49 pm
SJU
-
ONT
1 stop23h 16m
Multiple Airlines
Deal found 2/5$377
This Kiwi.com deal was found by Cheapflights users on 2/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ke 2/187:30 am
ONT
-
SJU
2 stops38h 55m
Multiple Airlines
ke 2/257:44 pm
SJU
-
ONT
1 stop22h 45m
Multiple Airlines
Deal found 2/4$391
This United Airlines deal was found by Cheapflights users on 2/5. 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.
su 5/246:30 pm
ONT
-
SJU
2 stops14h 34m
United Airlines
ma 6/11:40 pm
SJU
-
ONT
1 stop9h 37m
United Airlines
Deal found 2/5$395
This Delta deal was found by Cheapflights users on 2/7. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pe 5/157:05 am
ONT
-
SJU
1 stop12h 12m
Delta
la 5/232:20 pm
SJU
-
ONT
1 stop10h 34m
Delta
Deal found 2/7$397
This American Airlines deal was found by Cheapflights users on 2/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ke 2/186:00 am
ONT
-
SJU
1 stop13h 31m
American Airlines
ke 2/258:40 am
SJU
-
ONT
1 stop15h 05m
American Airlines
Deal found 2/4$407
This American Airlines deal was found by Cheapflights users on 2/8. 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.
ma 3/911:59 pm
ONT
-
SJU
1 stop8h 56m
American Airlines
ke 3/181:44 pm
SJU
-
ONT
1 stop10h 40m
American Airlines
Deal found 2/8$409
This United Airlines deal was found by Cheapflights users on 2/7. 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.
pe 5/155:00 am
ONT
-
SJU
1 stop9h 38m
United Airlines
la 5/307:20 am
SJU
-
ONT
2 stops17h 20m
United Airlines
Deal found 2/7$416
This Kiwi.com deal was found by Cheapflights users on 2/5. 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.
la 2/218:21 am
ONT
-
SJU
1 stop23h 16m
Multiple Airlines
ma 2/236:00 am
SJU
-
ONT
2 stops43h 34m
Multiple Airlines
Deal found 2/5$418

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 helmikuu 8, 2026.

Round-trip from

$284
(American Airlines)

One-way from

$142
(United Airlines)

Popular in

December

Cheapest in

October

Average price

$429
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 ($49 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 February 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 helmikuu 8, 2026.
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

la 4/25

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

pe 5/1

1:00 am-12:38 pm

2 stops14h 38m

$374

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

su 5/3

5:00 am-5:38 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

ke 5/6

7:00 am-5:52 pm

2 stops13h 52m

$374

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

pe 5/15

5:00 am-5:38 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

la 5/30

7:20 am-9:40 pm

2 stops17h 20m

$407

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

ma 3/9

11:59 pm-11:55 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

ke 3/18

1:44 pm-9:24 pm

1 stop10h 40m

$409

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

la 5/16

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

pe 5/29

1:00 am-12:32 pm

2 stops14h 32m

$424

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

su 5/24

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

ma 6/1

1:40 pm-8:17 pm

1 stop9h 37m

$424

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

la 4/25

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

ke 4/29

2:55 pm-9:50 pm

1 stop9h 55m

$431

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

ke 7/29

1:00 pm-5:29 am

2 stops13h 29m

San Juan Luis Munoz Marin Intl

ti 8/4

2:05 am-12:20 pm

2 stops13h 15m

$431

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

ma 3/2

5:00 am-11:57 pm

2 stops14h 57m

Aguadilla Borinquen

ti 3/3

1:09 am-12:48 pm

2 stops15h 39m

$663

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

ke 4/1

6:05 am-11:09 pm

2 stops14h 04m

Aguadilla Borinquen

ti 4/7

12:15 am-5:47 pm

2 stops20h 32m

$1,112

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/7

Showing 1-10 of 30 results
1
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

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 $145). 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.

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 helmikuu 8, 2026.
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
4,282 reviews

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

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
4,282 reviews
Southwest
8.0
Very good
4,282 reviews

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

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
8,173 reviews
Southwest
8.0
Very good
4,282 reviews

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

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
9,257 reviews
Southwest
8.0
Very good
4,282 reviews

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

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
11,254 reviews
Southwest
8.0
Very good
4,282 reviews

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

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
3,051 reviews
Southwest
8.0
Very good
4,282 reviews

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

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 56m. 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 American 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 $145). 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 helmikuu 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$292Average$530FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$321Average$536FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$365Average$619FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$480Average$605FlexibilityNo cancel feeOn-time63%

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