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Luis Munoz Marin Intl

$130+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Jan 20 — Jan 271
Tue 1/20
Tue 1/27
1 adult, Economy
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Find cheap flights from Ontario to Luis Munoz Marin Intl with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Ontario to San Juan Luis Munoz Marin Intl are usually found in October or February, 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

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 December 21, 2025.

This Frontier deal was found by Cheapflights users on 12/19. 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.
Sun 12/284:41 pmONT - SJU
1 stop9h 53mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/19$384
This Frontier deal was found by Cheapflights users on 12/19. 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 12/244:22 pmONT - SJU
1 stop10h 12mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/19$394
This Delta deal was found by Cheapflights users on 12/19. 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.
Mon 12/297:05 amONT - SJU
1 stop10h 04mDelta
Thu 2/196:15 amSJU - ONT
1 stop9h 47mDelta
Deal found 12/19$397
This United Airlines deal was found by Cheapflights users on 12/19. 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 12/246:04 amONT - SJU
1 stop11h 22mUnited Airlines
Tue 1/132:25 pmSJU - ONT
1 stop10h 33mUnited Airlines
Deal found 12/19$406
This American Airlines deal was found by Cheapflights users on 12/19. 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 12/232:42 pmONT - SJU
2 stops14h 53mAmerican Airlines
Tue 1/137:07 amSJU - ONT
1 stop19h 41mAmerican Airlines
Deal found 12/19$451
This Delta deal was found by Cheapflights users on 12/19. 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.
Mon 12/297:05 amONT - SJU
1 stop10h 04mDelta
Thu 1/222:15 pmSJU - ONT
1 stop10h 50mDelta
Deal found 12/19$459
This Frontier deal was found by Cheapflights users on 12/19. 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 12/254:16 pmONT - SJU
1 stop10h 18mFrontier
Thu 1/17:06 pmSJU - ONT
1 stop16h 13mFrontier
Deal found 12/19$464
This Frontier deal was found by Cheapflights users on 12/19. 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 12/244:22 pmONT - SJU
1 stop10h 12mFrontier
Sat 12/277:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/19$474
This Delta deal was found by Cheapflights users on 12/19. 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 12/3010:29 pmONT - SJU
1 stop9h 27mDelta
Thu 2/196:15 amSJU - ONT
1 stop9h 47mDelta
Deal found 12/19$477
This United Airlines deal was found by Cheapflights users on 12/19. 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 12/316:04 amONT - SJU
1 stop11h 22mUnited Airlines
Fri 1/163:46 pmSJU - ONT
1 stop10h 12mUnited Airlines
Deal found 12/19$518
This Frontier deal was found by Cheapflights users on 12/19. 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.
Sun 12/284:41 pmONT - SJU
1 stop9h 53mFrontier
Sun 1/47:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/19$522
This Frontier deal was found by Cheapflights users on 12/19. 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 12/244:22 pmONT - SJU
1 stop10h 12mFrontier
Sun 1/47:06 pmSJU - ONT
1 stop16h 18mFrontier
Deal found 12/19$532

Find 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 December 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$283
(American Airlines)

One-way from

$130
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$655
Provider with most accurate pricing for Ontario-San Juan Luis Munoz Marin Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-San Juan Luis Munoz Marin Intl flights.
Search Deals
From Ontario to San Juan Luis Munoz Marin Intl
Search Deals
One-way flight from Ontario to San Juan Luis Munoz Marin Intl
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($104 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 21, 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

Sun 5/3

11:25 pm-1:47 pm

1 stop11h 22m

San Juan Luis Munoz Marin Intl

Tue 5/5

1:50 pm-10:09 pm

1 stop11h 19m

$310

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 5/4

11:25 pm-1:47 pm

1 stop11h 22m

San Juan Luis Munoz Marin Intl

Mon 5/11

1:50 pm-10:09 pm

1 stop11h 19m

$310

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 5/3

11:25 pm-1:47 pm

1 stop11h 22m

San Juan Luis Munoz Marin Intl

Mon 5/11

1:50 pm-10:09 pm

1 stop11h 19m

$310

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 2/21

10:20 pm-1:01 pm

1 stop10h 41m

San Juan Luis Munoz Marin Intl

Wed 2/25

6:15 am-12:02 pm

1 stop9h 47m

$335

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 5/2

11:25 pm-12:49 pm

1 stop10h 24m

San Juan Luis Munoz Marin Intl

Mon 5/11

1:50 pm-10:09 pm

1 stop11h 19m

$336

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 5/7

11:25 pm-1:47 pm

1 stop11h 22m

San Juan Luis Munoz Marin Intl

Mon 5/11

1:50 pm-10:09 pm

1 stop11h 19m

$336

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 5/5

11:25 pm-12:49 pm

1 stop10h 24m

San Juan Luis Munoz Marin Intl

Mon 5/11

1:50 pm-10:09 pm

1 stop11h 19m

$336

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 5/2

11:25 pm-12:49 pm

1 stop10h 24m

San Juan Luis Munoz Marin Intl

Fri 5/8

1:50 pm-10:09 pm

1 stop11h 19m

$336

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 5/4

11:25 pm-12:49 pm

1 stop10h 24m

San Juan Luis Munoz Marin Intl

Thu 5/7

1:50 pm-10:09 pm

1 stop11h 19m

$342

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 5/7

11:25 pm-12:49 pm

1 stop10h 24m

San Juan Luis Munoz Marin Intl

Sat 5/9

1:50 pm-10:09 pm

1 stop11h 19m

$368

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/19

Showing 1-10 of 21 results
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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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 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 Expedia the most. Expedia 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 December 12, 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 $137). Flying from Ontario to San Juan Luis Munoz Marin Intl Airport 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.

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 December 21, 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 December 21, 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
4,257 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
8,021 reviews
Southwest
8.0
Very good
4,257 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
9,099 reviews
Southwest
8.0
Very good
4,257 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
11,050 reviews
Southwest
8.0
Very good
4,257 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
5.8
Fair
3,082 reviews
Southwest
8.0
Very good
4,257 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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 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 $335, JetBlue can have you in San Juan Luis Munoz Marin Intl Airport from Ontario in 10h 41m. The distance between Ontario and San Juan Luis Munoz Marin Intl Airport is about 3334 mi. This flight may include one or multiple stops.

  • 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 Delta, from $292, and United Airlines, from $318. 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 $137). Flying from Ontario to San Juan Luis Munoz Marin Intl Airport 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

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
Humacao
Luquillo
Bayamón

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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 December 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$467FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$321Average$555FlexibilityNo cancel feeOn-time69%
DeltaCheapest$355Average$518FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$365Average$617FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$480Average$610FlexibilityNo cancel feeOn-time63%

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