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Ontario

$138+ Cheap flights from Puerto Rico to Ontario (ONT)

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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Jun 11 — Jun 181
Thu 6/11
Thu 6/18
1 adult, Economy
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Cheap flight deals from Puerto Rico to Ontario

Cheapest flights from Puerto Rico to Ontario
Explore the most affordable flight options available from Puerto Rico to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 12, 2026.

This United Airlines deal was found by Cheapflights users on 5/12. 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 9/232:20 pm
SJU
-
ONT
1 stop10h 39m
United Airlines
Mon 9/286:00 am
ONT
-
SJU
1 stop11h 38m
United Airlines
Deal found 5/12$464
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/410:20 am
SJU
-
ONT
1 stop15h 05m
Southwest
Wed 8/58:35 am
ONT
-
SJU
2 stops10h 25m
Southwest
Deal found 5/7$472
This United Airlines deal was found by Cheapflights users on 5/7. 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.
Wed 8/267:00 am
SJU
-
ONT
2 stops16h 04m
United Airlines
Sat 8/295:00 am
ONT
-
SJU
1 stop9h 38m
United Airlines
Deal found 5/7$494
This Priceline deal was found by Cheapflights users on 5/11. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/46:25 am
SJU
-
ONT
1 stop13h 23m
Multiple Airlines
Mon 9/711:50 pm
ONT
-
SJU
1 stop11h 08m
Multiple Airlines
Deal found 5/11$523
This Priceline deal was found by Cheapflights users on 5/12. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:32 am
SJU
-
ONT
1 stop13h 11m
Multiple Airlines
Tue 8/1811:50 pm
ONT
-
SJU
1 stop11h 08m
Multiple Airlines
Deal found 5/12$524
This United Airlines deal was found by Cheapflights users on 5/7. 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.
Tue 11/107:45 am
SJU
-
ONT
2 stops14h 02m
United Airlines
Mon 11/165:00 am
ONT
-
SJU
1 stop9h 25m
United Airlines
Deal found 5/7$534
This Faresmojo deal was found by Cheapflights users on 5/11. 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 Faresmojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/181:30 pm
SJU
-
ONT
1 stop11h 35m
JetBlue
Mon 8/311:50 pm
ONT
-
SJU
1 stop13h 08m
JetBlue
Deal found 5/11$537
This Faresmojo deal was found by Cheapflights users on 5/11. 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 Faresmojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/172:48 pm
SJU
-
ONT
1 stop10h 00m
JetBlue
Sat 5/307:05 am
ONT
-
SJU
1 stop10h 25m
JetBlue
Deal found 5/11$538
This United Airlines deal was found by Cheapflights users on 5/7. 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.
Thu 6/41:40 pm
SJU
-
ONT
1 stop10h 06m
United Airlines
Wed 8/55:45 am
ONT
-
SJU
1 stop11h 53m
United Airlines
Deal found 5/7$551
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/46:00 am
SJU
-
ONT
2 stops12h 25m
Southwest
Mon 8/38:45 pm
ONT
-
SJU
2 stops11h 15m
Southwest
Deal found 5/7$568
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/95:00 am
SJU
-
ONT
1 stop10h 05m
Southwest
Mon 6/159:40 am
ONT
-
SJU
1 stop11h 45m
Southwest
Deal found 5/7$574

Find flight deals from Puerto Rico to Ontario

Keep the following information in mind while searching for Puerto Rico to Ontario flight deals. Data was last updated May 12, 2026.

Round-trip from

$464
(United Airlines)

One-way from

$138
(Frontier)

Popular in

November

Cheapest in

October

Average price

$400
From Puerto Rico to Ontario
Search Deals
One-way flight from Puerto Rico to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($14 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 May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Puerto Rico to Ontario 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 May 12, 2026.
Use the filters below to find and compare flights from Puerto Rico to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 6/4

6:00 am-3:25 pm

2 stops12h 25m

Ontario

Wed 8/5

6:50 am-10:00 pm

2 stops12h 10m

$520

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 5/23

1:14 pm-9:48 pm

1 stop11h 34m

Ontario

Sat 5/30

7:05 am-10:17 pm

1 stop12h 12m

$633

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 5/23

7:00 am-6:31 pm

2 stops14h 31m

Ontario

Sat 5/30

5:44 am-4:25 am

1 stop19h 41m

$660
Quickest round-trip

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 7/30

1:40 pm-8:42 pm

1 stop10h 02m

Ontario

Fri 7/31

5:00 am-5:38 pm

1 stop9h 38m

$707

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sun 5/24

5:45 am-3:00 pm

1 stop12h 15m

Ontario

Sun 5/24

9:55 pm-12:10 pm

1 stop11h 15m

$716

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Tue 6/2

9:54 am-8:47 pm

1 stop13h 53m

Ontario

Mon 6/8

10:41 pm-1:16 pm

1 stop11h 35m

$832

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 5/20

7:00 am-8:36 pm

2 stops16h 36m

Ontario

Sun 5/24

5:00 am-5:38 pm

1 stop9h 38m

$850

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Tue 6/2

2:05 am-9:55 pm

1 stop22h 50m

Ontario

Tue 6/9

5:45 am-8:38 pm

1 stop11h 53m

$857

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sun 7/5

2:05 am-9:55 pm

1 stop22h 50m

Ontario

Fri 7/17

1:50 pm-8:34 pm

2 stops27h 44m

$864

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 5/22

2:05 am-8:42 pm

2 stops21h 37m

Ontario

Wed 5/27

5:00 am-5:38 pm

1 stop9h 38m

$890

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/9

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Best time to book a flight from Puerto Rico to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Puerto Rico 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 Puerto Rico to Ontario

How far ahead should I book a flight from Puerto Rico to Ontario?

The best time to book flights from Puerto Rico to Ontario is 86 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Puerto Rico to Ontario?

Currently, May is the cheapest month in which you can book a flight from Puerto Rico to Ontario (average of $283). Flying from Puerto Rico to Ontario in March is currently the most expensive (average of $556). 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 Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated May 12, 2026.
Read through reviews of airlines operating flights from Puerto Rico to Ontario, such as Southwest,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,295 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,295 reviews
Southwest
8.0
Very good
4,295 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,701 reviews
Southwest
8.0
Very good
4,295 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,661 reviews
Southwest
8.0
Very good
4,295 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Related info for your journey

Find useful and relevant information for your journey from Puerto Rico to Ontario. 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 into for flights to Ontario from Puerto Rico?

    For a flight from Puerto Rico to Ontario, you will be flying into Ontario. Ontario (ONT) is just 3.1 mi from the center of the city.

  • How long is the flight from Puerto Rico to Ontario?

    A quick flight from Puerto Rico to Ontario can take about 11h 34m. Southwest provides one of the quickest options available for as low as $633. The distance between Puerto Rico and Ontario is about 3334 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Puerto Rico to Ontario one-way?

    The cheapest airlines for a one-way flight from Puerto Rico to Ontario are American Airlines ($178), Southwest ($192), and United Airlines ($228).

  • Can I find deals for flights from Puerto Rico to Ontario that include hotel bookings?

    Yes. In addition to deals on Puerto Rico to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Puerto Rico to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Puerto Rico to Ontario.

  • Can I find deals for business class flights from Puerto Rico to Ontario?

    Yes. Cheapflights offers flight deals from Puerto Rico to Ontario 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 Puerto Rico to Ontario?

    Currently, May is the cheapest month in which you can book a flight from Puerto Rico to Ontario (average of $283). Flying from Puerto Rico to Ontario in March is currently the most expensive (average of $556). 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 3 airlines flying from Puerto Rico to Ontario

Discover the top 3 airlines that operate flights from Puerto Rico to Ontario. 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 May 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$365Average$600FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$367Average$520FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$389Average$570FlexibilityNo cancel feeOn-time63%

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