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San Juan

$127+ Cheap flights from Ontario (ONT) to San Juan

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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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The best prices from Ontario to San Juan are usually found in June or September, booked 59 days in advance, depart on a Tuesday or Monday and return on a Wednesday

Cheap flight deals from Ontario to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Juan (PR1). 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 February 20, 2025.

Round-trip from

$274
(Trip.com)

One-way from

$127
(Trip.com)

Popular in

March

Cheapest in

June

Average price

$565
From Ontario to San Juan
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One-way flight from Ontario to San Juan
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Highest demand for flights based on searches. 8% potential increase in price ($48 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
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Find flight deals from Ontario to San Juan

Cheapest flights from Ontario to San Juan
Explore the most affordable flight options available from Ontario to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This Trip.com deal was found by Cheapflights users on 2/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/512:59 amONT - SJU
2 stops41h 45mFrontier
Mon 3/109:35 pmSJU - ONT
2 stops29h 29mFrontier
Deal found 2/19$198
This Delta deal was found by Cheapflights users on 2/19. 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.
Wed 4/27:00 amONT - SJU
1 stop13h 07mDelta
Wed 4/163:34 pmSJU - ONT
1 stop10h 02mDelta
Deal found 2/19$355
This JetBlue deal was found by Cheapflights users on 2/19. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/310:40 pmONT - SJU
1 stop10h 50mJetBlue
Thu 5/811:55 amSJU - ONT
1 stop12h 27mJetBlue
Deal found 2/19$390
This United Airlines deal was found by Cheapflights users on 2/19. 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 4/165:00 amONT - SJU
2 stops15h 54mUnited Airlines
Tue 4/291:05 amSJU - ONT
2 stops14h 33mUnited Airlines
Deal found 2/19$403
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 4/166:15 amONT - SJU
2 stops11h 13mAmerican Airlines
Wed 4/3011:45 amSJU - ONT
2 stops13h 13mAmerican Airlines
Deal found 2/19$405
This Southwest deal was found by Cheapflights users on 2/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/118:50 amONT - SJU
2 stops12h 00mSouthwest
Mon 9/155:00 amSJU - ONT
2 stops12h 15mSouthwest
Deal found 2/19$490
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/66:00 amONT - SJU
2 stops29h 00mAlaska Airlines
Tue 5/136:20 amSJU - ONT
2 stops20h 38mAlaska Airlines
Deal found 2/19$827

Find flights from Ontario to San Juan within your budget

Customize your flight search to find flights from Ontario to San Juan 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 20, 2025.

Fly from

Ontario

Fly to

San Juan

Route

Depart

Return

Price

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 4/1

12:59 am-1:14 am

2 stops21h 15m

San Juan Luis Munoz Marin Intl

Tue 4/8

9:28 am-11:59 pm

2 stops17h 31m

$274

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 4/16

6:15 am-8:28 pm

2 stops11h 13m

San Juan Luis Munoz Marin Intl

Wed 4/23

3:20 pm-10:10 pm

1 stop9h 50m

$405

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 4/14

7:20 pm-10:20 am

2 stops12h 00m

San Juan Luis Munoz Marin Intl

Fri 4/18

7:40 am-4:10 pm

2 stops11h 30m

$465

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 4/26

6:10 am-8:38 pm

1 stop11h 28m

San Juan Luis Munoz Marin Intl

Tue 4/29

1:40 pm-8:42 pm

1 stop10h 02m

$520

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 2/23

5:10 pm-12:45 pm

2 stops15h 35m

San Juan Luis Munoz Marin Intl

Fri 3/7

2:00 pm-10:52 pm

1 stop12h 52m

$615

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 5/7

10:40 pm-12:30 pm

1 stop10h 50m

San Juan Luis Munoz Marin Intl

Sun 5/11

11:55 am-9:22 pm

1 stop12h 27m

$627

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 3/7

12:58 am-2:23 am

3 stops45h 25m

San Juan Luis Munoz Marin Intl

Mon 3/10

8:03 pm-7:23 pm

3 stops26h 20m

$795

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 4/25

6:00 am-2:27 pm

2 stops29h 27m

San Juan Luis Munoz Marin Intl

Tue 4/29

6:05 am-10:51 am

2 stops31h 46m

$947

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 3/25

6:00 am-8:43 pm

2 stops11h 43m

$243

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 2/23

12:59 am-9:43 am

2 stops28h 44m

$264

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 12 results
1
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Best time to book a flight from Ontario to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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.

Travel insights for flights from Ontario to San Juan

Get recent, data-driven insights about flights from Ontario to San Juan including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Ontario to San Juan?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to San Juan. Price data was last updated on February 14, 2025.

To ensure you get the cheapest price possible for a flight from Ontario to San Juan, you should look to book at least 59 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Ontario to San Juan?

Currently, September is the cheapest month in which you can book a flight from Ontario to San Juan (average of $254). Flying from Ontario to San Juan in March is currently the most expensive (average of $363). 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 San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 20, 2025.

One of the essential ways to save on airfare from Ontario to San Juan 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 27% on airfare.

What is the cheapest day to fly from Ontario to San Juan?

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Juan. Price data was last updated on November 10, 2024.

Travelers seeking maximum savings on their Ontario to San Juan flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in San Juan by month

Plan your trip to San Juan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit San Juan when rainfall is around 2.2 in.

Temperature in San Juan by month

Plan your trip to San Juan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated February 20, 2025.
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

JetBlue
7.4
Good
3,070 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Juan. 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?

    If you book a flight to San Juan from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Ontario to San Juan per day from 6 different airlines.

  • What are the cheapest airlines flying from Ontario to San Juan round-trip?

    Frontier, at $274, was found to be the cheapest airline from Ontario to San Juan.Alternate airlines to your destination round-trip include American Airlines and United Airlines. Frontier is currently priced 50% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Ontario to San Juan one-way?

    $127 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and American Airlines, with prices starting from $223 and $309, respectively.

  • Can I find deals for flights from Ontario to San Juan that include hotel bookings?

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

  • How can I find direct flights from Ontario to San Juan?

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

  • Can I find deals for business class flights from Ontario to San Juan?

    Yes. Cheapflights offers flight deals from Ontario to San Juan 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?

    Currently, September is the cheapest month in which you can book a flight from Ontario to San Juan (average of $254). Flying from Ontario to San Juan in March is currently the most expensive (average of $363). 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.

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Top 6 airlines flying from Ontario to San Juan

Discover the top 6 airlines that operate flights from Ontario to San Juan. 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 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$260Average$328FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$273Average$418FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$322Average$642FlexibilityNo cancel feeOn-time69%
DeltaCheapest$334Average$474FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$355Average$608FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$374Average$568FlexibilityNo cancel feeOn-time63%
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