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Ontario

$111+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Apr 25 — May 21
Sat 4/25
Sat 5/2
1 adult, Economy
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Cheap 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 March 26, 2026.

This Delta deal was found by Cheapflights users on 3/25. 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 5/512:55 pm
SJU
-
ONT
1 stop11h 05m
Delta
Tue 5/1210:00 pm
ONT
-
SJU
1 stop11h 01m
Delta
Deal found 3/25$354
This Kiwi.com deal was found by Cheapflights users on 3/24. 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.
Fri 5/86:30 am
SJU
-
ONT
2 stops30h 35m
Multiple Airlines
Tue 5/128:30 am
ONT
-
SJU
1 stop11h 40m
Multiple Airlines
Deal found 3/24$414
This United Airlines deal was found by Cheapflights users on 3/23. 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 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
Sun 9/275:00 am
ONT
-
SJU
1 stop9h 30m
United Airlines
Deal found 3/23$444
This Priceline deal was found by Cheapflights users on 3/25. 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.
Tue 9/221:25 pm
SJU
-
ONT
1 stop11h 04m
JetBlue
Sat 9/2610:56 pm
ONT
-
SJU
1 stop10h 46m
JetBlue
Deal found 3/25$451
This Expedia deal was found by Cheapflights users on 3/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:25 am
SJU
-
ONT
1 stop13h 39m
Multiple Airlines
Fri 6/510:41 pm
ONT
-
SJU
1 stop13h 53m
Multiple Airlines
Deal found 3/23$452
This Priceline deal was found by Cheapflights users on 3/23. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:25 am
SJU
-
ONT
1 stop13h 23m
Multiple Airlines
Sat 9/1210:56 pm
ONT
-
SJU
1 stop10h 46m
Multiple Airlines
Deal found 3/23$453
This Kiwi.com deal was found by Cheapflights users on 3/25. 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.
Thu 4/96:55 pm
SJU
-
ONT
1 stop26h 50m
Multiple Airlines
Mon 4/139:02 pm
ONT
-
SJU
2 stops21h 57m
Multiple Airlines
Deal found 3/25$473
This Delta deal was found by Cheapflights users on 3/25. 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.
Sun 5/37:30 am
SJU
-
ONT
1 stop14h 03m
Delta
Sat 5/910:00 pm
ONT
-
SJU
1 stop12h 38m
Delta
Deal found 3/25$477
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Fri 10/232:55 pm
SJU
-
ONT
1 stop9h 26m
United Airlines
Sat 11/75:00 am
ONT
-
SJU
1 stop9h 25m
United Airlines
Deal found 3/24$478
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/252:20 pm
SJU
-
ONT
1 stop10h 39m
United Airlines
Sat 8/295:00 am
ONT
-
SJU
1 stop9h 38m
United Airlines
Deal found 3/22$481
This CheapOair deal was found by Cheapflights users on 3/25. 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.
Thu 5/286:25 am
SJU
-
ONT
1 stop15h 46m
Multiple Airlines
Tue 6/210:41 pm
ONT
-
SJU
1 stop23h 57m
Multiple Airlines
Deal found 3/25$493

Find 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 March 26, 2026.

Round-trip from

$354
(American Airlines)

One-way from

$111
(Frontier)

Popular in

March

Cheapest in

January

Average price

$556
From San Juan to Ontario
Search Deals
One-way flight from San Juan to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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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 March 26, 2026.
Use the filters below to find and compare flights from San Juan 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

Wed 5/6

12:55 pm-9:00 pm

1 stop11h 05m

Ontario

Fri 5/15

10:00 pm-1:38 pm

1 stop12h 38m

$354

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 5/7

1:00 am-10:35 pm

2 stops24h 35m

Ontario

Mon 5/11

5:00 am-5:38 pm

1 stop9h 38m

$594

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Mon 6/1

6:25 am-7:11 pm

1 stop15h 46m

Ontario

Fri 6/12

11:59 pm-7:10 pm

1 stop16h 11m

$622

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 4/8

7:00 am-5:47 pm

2 stops13h 47m

Ontario

Sun 4/12

5:10 am-5:38 pm

1 stop9h 28m

$653

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 5/8

2:55 pm-9:58 pm

1 stop10h 03m

Ontario

Tue 5/12

7:00 am-8:34 pm

1 stop10h 34m

$665

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 4/11

1:40 pm-12:38 pm

1 stop25h 58m

Ontario

Tue 4/21

6:05 am-8:38 pm

1 stop11h 33m

$745
Quickest round-trip

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Tue 4/14

2:55 pm-9:50 pm

1 stop9h 55m

Ontario

Thu 4/16

7:00 am-8:34 pm

1 stop10h 34m

$746

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 4/3

7:00 am-5:47 pm

2 stops13h 47m

Ontario

Sat 4/11

5:10 am-5:38 pm

1 stop9h 28m

$778

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 5/8

2:55 pm-9:58 pm

1 stop10h 03m

Ontario

Mon 5/18

6:00 am-8:38 pm

1 stop11h 38m

$816

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 4/18

1:00 am-12:20 pm

2 stops14h 20m

Ontario

Sun 4/26

5:10 am-5:38 pm

1 stop9h 28m

$822

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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

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

Use this chart to determine the optimal time to book a round-trip flight from San Juan to Ontario. Price data was last updated on March 13, 2026.

The best time to book flights from San Juan to Ontario is 46 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 San Juan to Ontario?

Currently, October is the cheapest month in which you can book a flight from San Juan to Ontario (average of $175). Flying from San Juan to Ontario in February is currently the most expensive (average of $295). 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.

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 March 26, 2026.
Read through reviews of airlines operating flights from San Juan 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
4,333 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
4,333 reviews
Southwest
8.0
Very good
4,333 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
9,483 reviews
Southwest
8.0
Very good
4,333 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
11,495 reviews
Southwest
8.0
Very good
4,333 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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 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 05m. Delta provides one of the quickest options available for as low as $354. 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 American Airlines is currently your cheapest option to Ontario, with prices starting at $365. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southwest, with the lowest prices starting at $367 and $389, respectively. You may be able to fly from San Juan to Ontario for 16% 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 $171 on JetBlue. Other airlines that offer cheap prices include American Airlines from $178 and Southwest from $192 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, October is the cheapest month in which you can book a flight from San Juan to Ontario (average of $175). Flying from San Juan to Ontario in February is currently the most expensive (average of $295). 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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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 March 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$365Average$746FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$367Average$520FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$389Average$430FlexibilityNo cancel feeOn-time63%

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