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Puerto Rico

$147+ 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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Mar 28 — Apr 41
Sat 3/28
Sat 4/4
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 February 26, 2026.

This United Airlines deal was found by Cheapflights users on 2/26. 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 4/146:05 am
ONT
-
SJU
1 stop11h 33m
United Airlines
Tue 4/211:00 am
SJU
-
ONT
2 stops14h 20m
United Airlines
Deal found 2/26$294
This Frontier deal was found by Cheapflights users on 2/24. 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 8/124:15 pm
ONT
-
SJU
1 stop10h 38m
Frontier
Wed 8/196:15 am
SJU
-
ONT
1 stop12h 10m
Frontier
Deal found 2/24$316
This Delta deal was found by Cheapflights users on 2/24. 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.
Tue 4/1410:15 pm
ONT
-
SJU
1 stop10h 30m
Delta
Sat 4/2512:55 pm
SJU
-
ONT
1 stop11h 05m
Delta
Deal found 2/24$336
This Frontier deal was found by Cheapflights users on 2/25. 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 5/274:15 pm
ONT
-
SJU
1 stop10h 38m
Frontier
Wed 6/36:15 am
SJU
-
ONT
1 stop12h 10m
Frontier
Deal found 2/25$356
This Delta deal was found by Cheapflights users on 2/25. 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 10/177:00 am
ONT
-
SJU
1 stop11h 59m
Delta
Wed 10/217:30 am
SJU
-
ONT
1 stop13h 48m
Delta
Deal found 2/25$367
This American Airlines deal was found by Cheapflights users on 2/24. 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.
Tue 4/142:08 pm
ONT
-
SJU
2 stops16h 05m
American Airlines
Thu 4/236:45 am
SJU
-
ONT
1 stop20h 01m
American Airlines
Deal found 2/24$376
This United Airlines deal was found by Cheapflights users on 2/23. 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.
Fri 9/255:00 am
ONT
-
SJU
1 stop9h 30m
United Airlines
Mon 9/282:55 pm
SJU
-
ONT
1 stop9h 26m
United Airlines
Deal found 2/23$379
This American Airlines deal was found by Cheapflights users on 2/23. 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.
Mon 8/177:02 pm
ONT
-
SJU
2 stops14h 43m
American Airlines
Thu 8/2010:32 am
SJU
-
ONT
2 stops14h 42m
American Airlines
Deal found 2/23$382
This United Airlines deal was found by Cheapflights users on 2/25. 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 10/135:00 am
ONT
-
SJU
1 stop9h 30m
United Airlines
Wed 10/212:00 pm
SJU
-
ONT
1 stop9h 20m
United Airlines
Deal found 2/25$384
This Kiwi.com deal was found by Cheapflights users on 2/23. 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.
Mon 4/137:35 pm
ONT
-
SJU
1 stop12h 32m
Multiple Airlines
Sat 4/182:09 pm
SJU
-
ONT
2 stops53h 29m
Multiple Airlines
Deal found 2/23$392
This Delta deal was found by Cheapflights users on 2/24. 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 4/1110:25 pm
ONT
-
SJU
1 stop12h 02m
Delta
Fri 4/2412:55 pm
SJU
-
ONT
1 stop11h 05m
Delta
Deal found 2/24$397
This Delta deal was found by Cheapflights users on 2/24. 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.
Wed 4/157:05 am
ONT
-
SJU
1 stop13h 07m
Delta
Tue 4/217:30 am
SJU
-
ONT
1 stop14h 03m
Delta
Deal found 2/24$398

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 February 26, 2026.

Round-trip from

$294
(United Airlines)

One-way from

$147
(United Airlines)

Popular in

December

Cheapest in

October

Average price

$443
From Ontario to Puerto Rico
Search Deals
One-way flight from Ontario to Puerto Rico
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($43 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 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 February 26, 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

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 4/21

6:05 am-8:38 pm

1 stop11h 33m

San Juan Luis Munoz Marin Intl

Wed 4/29

7:00 am-5:47 pm

2 stops13h 47m

$434

OntarioAguadilla

ONT - BQN

ONTBQN

Ontario

Tue 5/19

6:00 am-11:09 pm

2 stops14h 09m

Aguadilla Borinquen

Wed 5/27

12:15 am-12:12 pm

2 stops14h 57m

$434

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 3/10

10:25 pm-11:46 am

1 stop10h 21m

San Juan Luis Munoz Marin Intl

Fri 3/13

1:00 pm-9:00 pm

1 stop11h 00m

$475

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 3/7

5:15 am-6:25 pm

1 stop9h 10m

San Juan Luis Munoz Marin Intl

Wed 3/11

1:25 pm-8:50 pm

1 stop10h 25m

$481

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 4/26

5:10 am-5:38 pm

1 stop9h 28m

San Juan Luis Munoz Marin Intl

Thu 4/30

1:40 pm-8:36 pm

1 stop9h 56m

$495

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 3/8

11:59 pm-2:40 pm

1 stop11h 41m

San Juan Luis Munoz Marin Intl

Wed 3/11

1:25 pm-8:50 pm

1 stop10h 25m

$511

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 3/3

6:10 am-10:22 pm

2 stops12h 12m

San Juan Luis Munoz Marin Intl

Tue 3/3

2:05 am-5:41 pm

3 stops19h 36m

$555

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 4/18

6:05 am-8:38 pm

1 stop11h 33m

San Juan Luis Munoz Marin Intl

Tue 4/21

2:55 pm-9:50 pm

1 stop9h 55m

$557

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 3/3

8:00 am-9:26 pm

1 stop9h 26m

San Juan Luis Munoz Marin Intl

Thu 3/5

3:46 pm-10:36 pm

1 stop10h 50m

$560

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 4/16

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Tue 4/21

1:00 am-12:38 pm

2 stops14h 38m

$560

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/23

Showing 1-10 of 36 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 $145). 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 February 26, 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
4,301 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
4,301 reviews
Southwest
8.0
Very good
4,301 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
8,242 reviews
Southwest
8.0
Very good
4,301 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
9,349 reviews
Southwest
8.0
Very good
4,301 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
11,357 reviews
Southwest
8.0
Very good
4,301 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
3,041 reviews
Southwest
8.0
Very good
4,301 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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 21m. 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 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 February 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$509FlexibilityNo cancel feeOn-time62%
DeltaCheapest$292Average$597FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$321Average$530FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$365Average$623FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$455Average$467FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$480Average$595FlexibilityNo cancel feeOn-time63%

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