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Puerto Rico

$157+ 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
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
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 March 10, 2026.

This Frontier deal was found by Cheapflights users on 3/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/114:15 pm
ONT
-
SJU
1 stop10h 38m
Frontier
Sat 8/226:15 am
SJU
-
ONT
1 stop12h 10m
Frontier
Deal found 3/8$276
This Expedia deal was found by Cheapflights users on 3/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/24:15 pm
ONT
-
SJU
1 stop10h 38m
Frontier
Sun 6/76:15 am
SJU
-
ONT
1 stop12h 10m
Frontier
Deal found 3/6$300
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/265:10 am
ONT
-
SJU
1 stop9h 28m
United Airlines
Tue 5/57:20 am
SJU
-
ONT
2 stops16h 16m
United Airlines
Deal found 3/8$314
This Frontier deal was found by Cheapflights users on 3/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/114:15 pm
ONT
-
SJU
1 stop10h 38m
Frontier
Tue 8/186:15 am
SJU
-
ONT
1 stop12h 10m
Frontier
Deal found 3/5$316
This Frontier deal was found by Cheapflights users on 3/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/24:15 pm
ONT
-
SJU
1 stop10h 38m
Frontier
Mon 6/296:15 am
SJU
-
ONT
1 stop12h 10m
Frontier
Deal found 3/6$335
This Delta deal was found by Cheapflights users on 3/7. 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.
Sat 4/257:05 am
ONT
-
SJU
1 stop13h 07m
Delta
Wed 5/612:55 pm
SJU
-
ONT
1 stop11h 05m
Delta
Deal found 3/7$336
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/205:10 am
ONT
-
SJU
1 stop9h 28m
United Airlines
Wed 4/227:40 am
SJU
-
ONT
2 stops18h 05m
United Airlines
Deal found 3/8$340
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:00 am
ONT
-
SJU
1 stop10h 34m
United Airlines
Sat 5/27:40 am
SJU
-
ONT
1 stop13h 21m
United Airlines
Deal found 3/6$349
This Frontier deal was found by Cheapflights users on 3/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/184:15 pm
ONT
-
SJU
1 stop10h 38m
Frontier
Mon 8/246:15 am
SJU
-
ONT
1 stop12h 10m
Frontier
Deal found 3/9$351
This Delta deal was found by Cheapflights users on 3/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/147:00 am
ONT
-
SJU
1 stop12h 13m
Delta
Wed 11/181:55 pm
SJU
-
ONT
1 stop12h 19m
Delta
Deal found 3/9$353
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
-
SJU
1 stop11h 38m
United Airlines
Sat 5/97:40 am
SJU
-
ONT
1 stop13h 21m
United Airlines
Deal found 3/9$354
This United Airlines deal was found by Cheapflights users on 3/5. 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.
Sun 5/175:00 am
ONT
-
BQN
2 stops15h 09m
United Airlines
Fri 5/2912:15 am
BQN
-
ONT
2 stops14h 57m
United Airlines
Deal found 3/5$635

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 March 10, 2026.

Round-trip from

$276
(Frontier)

One-way from

$157
(United Airlines)

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. 11% potential increase in price ($76 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 10, 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

Fri 8/21

6:20 am-8:05 pm

2 stops10h 45m

San Juan Luis Munoz Marin Intl

Sun 8/23

5:00 am-2:10 pm

2 stops12h 10m

$478
Quickest round-trip

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 4/20

5:10 am-5:38 pm

1 stop9h 28m

San Juan Luis Munoz Marin Intl

Fri 4/24

2:55 pm-9:50 pm

1 stop9h 55m

$580

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 7/28

5:45 am-8:38 pm

1 stop11h 53m

San Juan Luis Munoz Marin Intl

Mon 8/3

2:55 pm-9:55 pm

1 stop10h 00m

$580

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 6/13

9:40 pm-12:25 pm

1 stop11h 45m

San Juan Luis Munoz Marin Intl

Sat 6/27

5:00 am-7:15 pm

1 stop17h 15m

$586

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Sun 5/17

5:00 am-11:09 pm

2 stops15h 09m

Aguadilla Borinquen

Fri 5/29

12:15 am-12:12 pm

2 stops14h 57m

$635

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 4/27

6:49 pm-1:45 pm

2 stops15h 56m

San Juan Luis Munoz Marin Intl

Wed 4/29

1:00 am-10:35 pm

2 stops24h 35m

$669

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 4/1

6:05 am-8:38 pm

1 stop11h 33m

San Juan Luis Munoz Marin Intl

Wed 4/8

1:40 pm-8:36 pm

1 stop9h 56m

$691

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 5/17

6:00 am-8:38 pm

1 stop11h 38m

San Juan Luis Munoz Marin Intl

Sun 5/24

1:40 pm-8:42 pm

1 stop10h 02m

$696

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Wed 5/20

11:25 pm-2:55 am

1 stop24h 30m

Aguadilla Borinquen

Wed 5/27

5:33 am-8:45 pm

1 stop18h 12m

$717

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 5/8

6:00 am-8:38 pm

1 stop11h 38m

San Juan Luis Munoz Marin Intl

Thu 5/14

2:55 pm-9:58 pm

1 stop10h 03m

$730

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/6

Showing 1-10 of 33 resultsSorted by cheapest first
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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 $141). Flying from Ontario to Puerto Rico in February is currently the most expensive (average of $295). 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 March 10, 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
4,317 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

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
4,317 reviews
Southwest
8.0
Very good
4,317 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

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
8,276 reviews
Southwest
8.0
Very good
4,317 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

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
9,409 reviews
Southwest
8.0
Very good
4,317 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

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
7.1
Good
11,414 reviews
Southwest
8.0
Very good
4,317 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

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
5.7
Fair
3,033 reviews
Southwest
8.0
Very good
4,317 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

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 9h 28m. There are 3334 mi between Ontario and Puerto Rico. This flight may include one or multiple stops.

  • 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 $141). Flying from Ontario to Puerto Rico in February is currently the most expensive (average of $295). 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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$292Average$597FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$321Average$549FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$365Average$602FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$445Average$570FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$455Average$467FlexibilityNo cancel feeOn-time62%

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