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Luis Munoz Marin Intl

$158+ Cheap flights from Ontario (ONT) to Luis Munoz Marin Intl (SJU)

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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to San Juan Luis Munoz Marin Intl are usually found in October or April, booked 24 days in advance, depart on a Tuesday or Monday and return on a Wednesday

Cheap flight deals from Ontario to Luis Munoz Marin Intl

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Luis Munoz Marin Intl (SJU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$284
(Trip.com)

One-way from

$158
(Frontier)

Popular in

December

Cheapest in

October

Average price

$424
Provider with most accurate pricing for Ontario-San Juan Luis Munoz Marin Intl flight deals.
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Provider most trusted by Cheapflights users for Ontario-San Juan Luis Munoz Marin Intl flights.
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From Ontario to San Juan Luis Munoz Marin Intl
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One-way flight from Ontario to San Juan Luis Munoz Marin Intl
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Highest demand for flights based on searches. 7% potential increase in price ($47 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Ontario to Luis Munoz Marin Intl

Cheapest flights from Ontario to Luis Munoz Marin Intl
Explore the most affordable flight options available from Ontario to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2025.

This Trip.com deal was found by Cheapflights users on 10/22. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/52:05 pmONT - SJU
1 stop23h 28mMultiple Airlines
Sun 12/77:00 amSJU - ONT
1 stop13h 33mMultiple Airlines
Deal found 10/22$284
This Kiwi.com deal was found by Cheapflights users on 10/23. 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.
Sat 12/63:20 pmONT - SJU
2 stops28h 05mMultiple Airlines
Sun 12/1412:00 pmSJU - ONT
1 stop32h 33mMultiple Airlines
Deal found 10/23$312
This American Airlines deal was found by Cheapflights users on 10/20. 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 11/1010:34 pmONT - SJU
1 stop18h 14mAmerican Airlines
Sat 11/156:25 amSJU - ONT
2 stops15h 55mAmerican Airlines
Deal found 10/20$355
This Kiwi.com deal was found by Cheapflights users on 10/21. 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.
Tue 12/304:41 pmONT - SJU
1 stop27h 57mMultiple Airlines
Sun 1/117:10 amSJU - ONT
2 stops35h 21mMultiple Airlines
Deal found 10/21$366
This Frontier deal was found by Cheapflights users on 10/20. 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 11/67:39 amONT - SJU
2 stops13h 53mFrontier
Sat 11/154:14 pmSJU - ONT
2 stops18h 13mFrontier
Deal found 10/20$373
This Frontier deal was found by Cheapflights users on 10/22. 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.
Mon 11/107:24 pmONT - SJU
2 stops18h 30mFrontier
Fri 11/142:11 amSJU - ONT
2 stops12h 59mFrontier
Deal found 10/22$376
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 11/1010:43 pmONT - SJU
2 stops39h 11mMultiple Airlines
Thu 11/139:28 pmSJU - ONT
1 stop14h 01mMultiple Airlines
Deal found 10/22$377
This United Airlines deal was found by Cheapflights users on 10/21. 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 - SJU
2 stops13h 17mUnited Airlines
Thu 12/182:25 pmSJU - ONT
1 stop10h 42mUnited Airlines
Deal found 10/21$380
This Frontier deal was found by Cheapflights users on 10/21. 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.
Mon 11/177:44 pmONT - SJU
2 stops18h 10mFrontier
Sun 11/233:59 amSJU - ONT
2 stops21h 07mFrontier
Deal found 10/21$382
This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:39 amONT - SJU
2 stops13h 53mFrontier
Wed 11/129:00 amSJU - ONT
2 stops16h 29mFrontier
Deal found 10/23$386

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Luis Munoz Marin Intl 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 October 23, 2025.
Use the filters below to find and compare flights from Ontario to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Ontario

Fly to

Luis Munoz Marin Intl

Route

Depart

Return

Price

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 12/11

5:05 am-10:22 pm

2 stops13h 17m

San Juan Luis Munoz Marin Intl

Thu 12/18

8:10 am-9:07 pm

2 stops16h 57m

$422

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 2/18

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Tue 2/24

2:25 pm-8:50 pm

1 stop10h 25m

$445

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 2/5

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Thu 2/12

2:25 pm-8:50 pm

1 stop10h 25m

$445

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 11/10

7:00 am-9:00 pm

1 stop10h 00m

San Juan Luis Munoz Marin Intl

Fri 11/14

2:05 am-12:33 pm

2 stops14h 28m

$445

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 2/17

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Tue 2/24

2:25 pm-8:50 pm

1 stop10h 25m

$480

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 1/22

6:39 pm-2:40 pm

2 stops16h 01m

San Juan Luis Munoz Marin Intl

Wed 1/28

7:45 am-8:58 pm

2 stops17h 13m

$480

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 1/14

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Tue 1/20

2:25 pm-8:58 pm

1 stop10h 33m

$480

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 2/14

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Tue 2/24

2:25 pm-8:50 pm

1 stop10h 25m

$480

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 4/11

6:10 am-9:25 pm

2 stops12h 15m

San Juan Luis Munoz Marin Intl

Sun 4/19

5:00 am-3:10 pm

1 stop13h 10m

$487

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 3/3

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Thu 3/5

2:25 pm-8:45 pm

1 stop10h 20m

$520

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 21 results
1
2
3

Compare providers for flights from Ontario to Luis Munoz Marin Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Luis Munoz Marin Intl in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-San Juan Luis Munoz Marin Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-San Juan Luis Munoz Marin Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-San Juan Luis Munoz Marin Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-San Juan Luis Munoz Marin Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl Airport

How far ahead should I book a flight from Ontario to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Luis Munoz Marin Intl. Price data was last updated on October 17, 2025.

The best time to book flights from Ontario to San Juan Luis Munoz Marin Intl Airport is 24 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 Ontario to San Juan Luis Munoz Marin Intl Airport?

Currently, April is the cheapest month in which you can book a flight from Ontario to San Juan Luis Munoz Marin Intl Airport (average of $133). Flying from Ontario to San Juan Luis Munoz Marin Intl Airport in July is currently the most expensive (average of $284). 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 SJU?

Find hourly flight availability from Ontario to Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 23, 2025.

One of the essential ways to save on airfare from Ontario to San Juan Luis Munoz Marin Intl Airport 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 26% on airfare.

Reviews of airlines servicing Luis Munoz Marin Intl

Get insights into the airlines that provide service to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl. Reviews last updated October 23, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Ontario to San Juan Luis Munoz Marin Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,236 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
7,982 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,995 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,033 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,128 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Luis Munoz Marin Intl. 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 San Juan Luis Munoz Marin Intl?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to San Juan Luis Munoz Marin Intl. 5 airlines have flights from Ontario to San Juan Luis Munoz Marin Intl on a regular basis. Booking flights from Ontario to San Juan Luis Munoz Marin Intl should not be difficult; the airport handles an average of 0 outbound flights to San Juan Luis Munoz Marin Intl per day.

  • How long is the flight from Ontario to San Juan Luis Munoz Marin Intl Airport?

    For as low as $422, United Airlines can have you in San Juan Luis Munoz Marin Intl Airport from Ontario in 13h 17m. The distance between Ontario and San Juan Luis Munoz Marin Intl Airport is about 3334 mi.

  • What are the cheapest airlines flying from Ontario to San Juan Luis Munoz Marin Intl Airport round-trip?

    Cheapflights users have booked flights from Ontario to San Juan Luis Munoz Marin Intl Airport round-trip from $73. Other airlines that can offer you cheap pricing are American Airlines, from $365, and United Airlines, from $366. Frontier is currently priced 87% below the average price you’ll pay for this route.

  • Can I find deals for flights from Ontario to Luis Munoz Marin Intl that include hotel bookings?

    Yes. In addition to deals on Ontario to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Luis Munoz Marin Intl?

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

  • Can I find deals for business class flights from Ontario to Luis Munoz Marin Intl?

    Yes. Cheapflights offers flight deals from Ontario to Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl Airport?

    Currently, April is the cheapest month in which you can book a flight from Ontario to San Juan Luis Munoz Marin Intl Airport (average of $133). Flying from Ontario to San Juan Luis Munoz Marin Intl Airport in July is currently the most expensive (average of $284). 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

Traveling to a place near San Juan Luis Munoz Marin Intl Airport?

Book flights to San Juan Luis Munoz Marin Intl Airport if you plan to visit one of these locations
Dorado
Fajardo
Rio Grande
Luquillo
Humacao

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Alternative routes for Ontario to Luis Munoz Marin Intl

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 Luis Munoz Marin Intl

Discover the top 5 airlines that operate flights from Ontario to Luis Munoz Marin Intl. 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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$467FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$365Average$610FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$366Average$591FlexibilityNo cancel feeOn-time69%
DeltaCheapest$375Average$534FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$409Average$598FlexibilityNo cancel feeOn-time63%

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