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Ontario

$207+ 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 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Sep 3 — Sep 101
Thu 9/3
Thu 9/10
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 August 4, 2026.

This United Airlines deal was found by Cheapflights users on 8/2. 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 8/277:00 am
SJU
-
ONT
2 stops14h 11m
United Airlines
Wed 9/25:00 am
ONT
-
SJU
2 stops15h 50m
United Airlines
Deal found 8/2$458
This United Airlines deal was found by Cheapflights users on 7/31. 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 9/242:55 pm
SJU
-
ONT
1 stop10h 04m
United Airlines
Mon 9/286:00 am
ONT
-
SJU
1 stop11h 38m
United Airlines
Deal found 7/31$504
This JetBlue deal was found by Cheapflights users on 7/30. 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.
Fri 9/111:00 pm
SJU
-
ONT
1 stop10h 57m
JetBlue
Mon 9/1410:39 pm
ONT
-
SJU
1 stop12h 00m
JetBlue
Deal found 7/30$509
This American Airlines deal was found by Cheapflights users on 8/1. 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 10/286:20 am
SJU
-
ONT
2 stops15h 24m
American Airlines
Tue 11/34:51 pm
ONT
-
SJU
2 stops16h 12m
American Airlines
Deal found 8/1$520
This American Airlines deal was found by Cheapflights users on 8/2. 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.
Thu 8/277:24 pm
SJU
-
ONT
2 stops17h 10m
American Airlines
Wed 9/26:15 am
ONT
-
SJU
2 stops12h 40m
American Airlines
Deal found 8/2$525
This United Airlines deal was found by Cheapflights users on 7/30. 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 9/117:00 am
SJU
-
ONT
2 stops14h 11m
United Airlines
Mon 9/146:00 am
ONT
-
SJU
1 stop11h 38m
United Airlines
Deal found 7/30$555
This United Airlines deal was found by Cheapflights users on 8/3. 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 9/43:56 pm
SJU
-
ONT
2 stops23h 16m
United Airlines
Tue 9/86:00 am
ONT
-
SJU
1 stop11h 38m
United Airlines
Deal found 8/3$604
This JetBlue deal was found by Cheapflights users on 8/3. 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.
Fri 9/1110:30 am
SJU
-
ONT
1 stop13h 27m
JetBlue
Fri 9/2510:39 pm
ONT
-
SJU
1 stop12h 00m
JetBlue
Deal found 8/3$612
This Southwest deal was found by Cheapflights users on 7/30. 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.
Mon 11/235:35 am
SJU
-
ONT
2 stops12h 30m
Southwest
Thu 12/106:00 am
ONT
-
SJU
2 stops12h 15m
Southwest
Deal found 7/30$616

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 August 4, 2026.

Round-trip from

$458
(United Airlines)

One-way from

$207
(Delta)

Popular in

July

Cheapest in

January

Average price

$665
From San Juan to Ontario
Search Deals
One-way flight from San Juan to Ontario
Search Deals
Highest demand for flights based on searches. 28% potential increase in price ($221 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($54 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 4, 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 10/21

2:00 pm-8:58 pm

1 stop9h 58m

Ontario

Sun 11/1

7:00 am-9:00 pm

1 stop10h 00m

$504

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 9/24

2:55 pm-9:59 pm

1 stop10h 04m

Ontario

Mon 9/28

6:00 am-8:38 pm

1 stop11h 38m

$504

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/28

6:40 am-6:01 pm

2 stops14h 21m

Ontario

Wed 11/11

5:00 am-6:25 pm

1 stop9h 25m

$504

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 9/30

2:00 pm-8:58 pm

1 stop9h 58m

Ontario

Sat 10/3

6:00 am-8:38 pm

1 stop11h 38m

$504

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/28

6:40 am-6:01 pm

2 stops14h 21m

Ontario

Tue 11/3

7:00 am-9:00 pm

1 stop10h 00m

$504

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 9/17

2:20 pm-9:59 pm

1 stop10h 39m

Ontario

Sat 9/26

5:00 am-5:38 pm

1 stop9h 38m

$504

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 9/11

1:00 pm-8:57 pm

1 stop10h 57m

Ontario

Mon 9/14

10:39 pm-1:39 pm

1 stop12h 00m

$509

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 9/11

7:00 am-6:11 pm

2 stops14h 11m

Ontario

Mon 9/14

6:00 am-8:38 pm

1 stop11h 38m

$557
Quickest round-trip

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 9/12

2:55 pm-9:59 pm

1 stop10h 04m

Ontario

Sat 9/26

5:00 am-5:38 pm

1 stop9h 38m

$557

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 9/4

3:56 pm-12:12 pm

2 stops23h 16m

Ontario

Tue 9/8

6:00 am-8:38 pm

1 stop11h 38m

$604

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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, January is the cheapest month in which you can book a flight from San Juan to Ontario (average of $288). Flying from San Juan to Ontario in July is currently the most expensive (average of $1,150). 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 far ahead should I book a flight from San Juan to Ontario?

The best time to book flights from San Juan to Ontario is 19 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.

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 August 4, 2026.
Read through reviews of airlines operating flights from San Juan to Ontario, such as United Airlines and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,059 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
10,059 reviews
United Airlines
7.4
Good
10,059 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
American Airlines
7.1
Good
11,845 reviews
United Airlines
7.4
Good
10,059 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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. 2 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 9h 58m. United Airlines provides one of the quickest options available for as low as $504. The distance from San Juan to Ontario is about 3334 mi.

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

    Flying on United Airlines is currently your cheapest option to Ontario, with prices starting at $367. Another option worth looking into is American Airlines, starting at $461 round trip. You may be able to fly from San Juan to Ontario for 34% 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 $176 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, January is the cheapest month in which you can book a flight from San Juan to Ontario (average of $288). Flying from San Juan to Ontario in July is currently the most expensive (average of $1,150). 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 2 airlines flying from San Juan to Ontario

Discover the top 2 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 August 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$367Average$593FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$461Average$665FlexibilityNo cancel feeOn-time71%

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