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$177+ Cheap flights from San Juan 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from San Juan to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from San Juan (PR1) to Ontario (ONT). 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 September 16, 2025.

Round-trip from

$328
(Frontier)

One-way from

$177
(Trip.com)

Popular in

January

Cheapest in

July

Average price

$480
From San Juan to Ontario
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One-way flight from San Juan to Ontario
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Highest demand for flights based on searches. 15% potential increase in price ($88 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from San Juan to Ontario

Cheapest flights from San Juan to Ontario
Explore the most affordable flight options available from San Juan to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Frontier deal was found by Cheapflights users on 9/15. 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 10/151:59 amSJU - ONT
2 stops16h 33mFrontier
Mon 10/205:15 pmONT - SJU
2 stops19h 09mFrontier
Deal found 9/15$328
This Frontier deal was found by Cheapflights users on 9/15. 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 10/156:22 amSJU - ONT
2 stops20h 28mFrontier
Wed 10/226:53 amONT - SJU
2 stops16h 37mFrontier
Deal found 9/15$330
This Frontier deal was found by Cheapflights users on 9/16. 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.
Fri 11/710:39 pmSJU - ONT
2 stops17h 58mFrontier
Sun 11/97:17 amONT - SJU
2 stops14h 15mFrontier
Deal found 9/16$353
This SmartFares deal was found by Cheapflights users on 9/13. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/221:25 pmSJU - ONT
1 stop11h 04mJetBlue
Fri 10/2410:56 pmONT - SJU
1 stop11h 49mJetBlue
Deal found 9/13$366
This SmartFares deal was found by Cheapflights users on 9/16. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/31:29 pmSJU - ONT
1 stop11h 00mJetBlue
Tue 10/710:56 pmONT - SJU
1 stop12h 58mJetBlue
Deal found 9/16$398
This Frontier deal was found by Cheapflights users on 9/16. 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.
Sat 10/44:42 pmSJU - ONT
2 stops17h 41mFrontier
Sat 10/181:37 pmONT - SJU
2 stops22h 47mFrontier
Deal found 9/16$409
This JetBlue deal was found by Cheapflights users on 9/14. 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 10/41:29 pmSJU - ONT
1 stop11h 00mJetBlue
Sat 10/1810:56 pmONT - SJU
1 stop12h 58mJetBlue
Deal found 9/14$425
This CheapOair deal was found by Cheapflights users on 9/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:00 amSJU - ONT
1 stop18h 29mJetBlue
Wed 10/2210:56 pmONT - SJU
1 stop12h 58mJetBlue
Deal found 9/14$441

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Juan 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 September 16, 2025.
Use the filters below to find and compare flights from San Juan to Ontario that are best for you.

Fly from

San Juan

Fly to

Ontario

Route

Depart

Return

Price

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/15

1:59 am-3:32 pm

2 stops16h 33m

Ontario

Mon 10/20

5:15 pm-3:24 pm

2 stops19h 09m

$328

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/15

6:22 am-11:50 pm

2 stops20h 28m

Ontario

Wed 10/22

6:53 am-2:30 am

2 stops16h 37m

$330

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 11/7

10:39 pm-12:37 pm

2 stops17h 58m

Ontario

Sun 11/9

7:17 am-1:32 am

2 stops14h 15m

$353

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/22

1:25 pm-9:29 pm

1 stop11h 04m

Ontario

Fri 10/24

10:56 pm-1:45 pm

1 stop11h 49m

$366

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 10/3

1:29 pm-9:29 pm

1 stop11h 00m

Ontario

Tue 10/7

10:56 pm-2:54 pm

1 stop12h 58m

$398

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 10/4

4:42 pm-7:23 am

2 stops17h 41m

Ontario

Sat 10/18

1:37 pm-3:24 pm

2 stops22h 47m

$409

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 10/4

1:29 pm-9:29 pm

1 stop11h 00m

Ontario

Sat 10/18

10:56 pm-2:54 pm

1 stop12h 58m

$469

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 10/4

12:01 pm-9:24 pm

2 stops12h 23m

Ontario

Sat 10/18

6:15 am-9:14 pm

2 stops11h 59m

$470

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Tue 9/30

1:25 pm-9:29 pm

1 stop11h 04m

Ontario

Sat 10/11

10:56 pm-2:54 pm

1 stop12h 58m

$476

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 10/16

1:25 pm-9:29 pm

1 stop11h 04m

Ontario

Mon 10/20

10:56 pm-12:58 pm

1 stop11h 02m

$486

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 21 results
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Best time to book a flight from San Juan to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from San Juan to Ontario (average of $246). Flying from San Juan to Ontario in March is currently the most expensive (average of $327). 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 SJU to ONT?

Find hourly flight availability from San Juan to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

A simple way to save on the total cost of your ticket is to fly from San Juan to Ontario in the morning. If you’re flexible enough to do this you can expect to save up to 46% on your trip compared to booking a flight in the afternoon.

How much does it cost to fly round-trip from San Juan to Ontario?

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 September 16, 2025.
Read through reviews of airlines operating flights from San Juan to Ontario, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,957 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,924 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,957 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from San Juan to Ontario. 3 airlines have flights to Ontario from San Juan on a regular basis. Booking flights from San Juan to Ontario should not be difficult; the airport handles an average of 0 inbound flights from San Juan per day.

  • How long is the flight from San Juan to Ontario?

    A quick flight from San Juan to Ontario can take about 11h 04m. Frontier provides one of the quickest options available for as low as $366. The distance from San Juan to Ontario is about 3334 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Flying on Delta is currently your cheapest option to Ontario, with prices starting at $344. Additional round-trip tickets that might be worth considering are offered by American Airlines and United Airlines, with the lowest prices starting at $355 and $433, respectively. You may be able to fly from San Juan to Ontario for 29% less than the average price by searching for these airlines.

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

    One-way options have recently been found by users for as low as $177 on Frontier. Other airlines that offer cheap prices include JetBlue from $190 and Delta from $237 one-way.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from San Juan to Ontario (average of $246). Flying from San Juan to Ontario in March is currently the most expensive (average of $327). 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

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Alternative routes for San Juan to Ontario

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Top 3 airlines flying from San Juan to Ontario

Discover the top 3 airlines that operate flights from San Juan 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$344Average$570FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$355Average$645FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$433Average$656FlexibilityNo cancel feeOn-time69%

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