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Cheap flights from Ontario to San Juan from $139

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Juan departing on 3/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to San Juan

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
11:58 pm - 6:09 pm
ONT
-
SJU
14h 11m
2 stops
American Airlines Logo
7:33 am - 11:59 pm
SJU
-
ONT
20h 26m
1 stop
$284American Airlines
Mon, Mar 2 - Fri, Mar 6
United Airlines Logo
7:00 am - 8:34 pm
ONT
-
SJU
10h 34m
1 stop
United Airlines Logo
7:20 am - 10:30 pm
SJU
-
ONT
18h 10m
2 stops
$309United Airlines
Sat, May 16 - Tue, May 19
Multiple Airlines Logo
2:21 pm - 11:37 am
ONT
-
SJU
17h 16m
1 stop
Multiple Airlines Logo
11:07 am - 9:34 pm
SJU
-
ONT
14h 27m
2 stops
$311Multiple Airlines
Fri, Feb 27 - Tue, Mar 3
Multiple Airlines Logo
3:36 pm - 12:27 pm
ONT
-
SJU
16h 51m
1 stop
Multiple Airlines Logo
7:54 pm - 7:26 am
SJU
-
ONT
39h 32m
2 stops
$319Multiple Airlines
Mon, Feb 9 - Thu, Feb 12
Multiple Airlines Logo
5:18 pm - 11:07 am
ONT
-
SJU
14h 49m
1 stop
Multiple Airlines Logo
6:00 am - 6:45 pm
SJU
-
ONT
15h 45m
2 stops
$331Multiple Airlines
Tue, Apr 7 - Thu, Apr 9
United Airlines Logo
7:00 am - 8:34 pm
ONT
-
SJU
10h 34m
1 stop
United Airlines Logo
2:55 pm - 9:58 pm
SJU
-
ONT
10h 03m
1 stop
$334United Airlines
Sun, May 10 - Wed, May 13
Delta Logo
10:15 pm - 11:50 am
ONT
-
SJU
10h 35m
1 stop
Delta Logo
2:34 pm - 9:00 pm
SJU
-
ONT
9h 26m
1 stop
$336Delta
Sat, Apr 25 - Tue, May 5
Multiple Airlines Logo
6:00 am - 12:54 am
ONT
-
SJU
38h 54m
2 stops
Multiple Airlines Logo
7:44 pm - 2:29 pm
SJU
-
ONT
22h 45m
1 stop
$346Multiple Airlines
Sat, Feb 21 - Sat, Feb 28
Multiple Airlines Logo
7:35 pm - 11:07 am
ONT
-
SJU
12h 32m
1 stop
Multiple Airlines Logo
6:07 pm - 11:55 pm
SJU
-
ONT
32h 48m
2 stops
$350Multiple Airlines
Mon, Apr 6 - Mon, Apr 13
American Airlines Logo
2:08 pm - 9:13 am
ONT
-
SJU
16h 05m
2 stops
American Airlines Logo
12:53 pm - 8:27 pm
SJU
-
ONT
10h 34m
1 stop
$362American Airlines
Thu, May 7 - Tue, May 12

JetBlue flights from Ontario to San Juan Luis Munoz Marin Intl Airport

Our best JetBlue deals on Ontario to San Juan Luis Munoz Marin Intl Airport flight tickets
JetBlue
May 23
ONT11:25 pmOntario
11h 22m
1 stop
SJU1:47 pmSan Juan Luis Munoz Marin Intl
May 27
SJU1:50 pmSan Juan Luis Munoz Marin Intl
11h 19m
1 stop
ONT10:09 pmOntario
$399
JetBlue
May 18
ONT11:25 pmOntario
11h 04m
1 stop
SJU1:29 pmSan Juan Luis Munoz Marin Intl
May 26
SJU1:50 pmSan Juan Luis Munoz Marin Intl
11h 19m
1 stop
ONT10:09 pmOntario
$401
JetBlue
Jul 21
ONT11:25 pmOntario
10h 24m
1 stop
SJU12:49 pmSan Juan Luis Munoz Marin Intl
Jul 28
SJU1:50 pmSan Juan Luis Munoz Marin Intl
11h 19m
1 stop
ONT10:09 pmOntario
$461

United Airlines flights from Ontario to San Juan Luis Munoz Marin Intl Airport

Our best United Airlines deals on Ontario to San Juan Luis Munoz Marin Intl Airport flight tickets
United Airlines
May 16
ONT7:00 amOntario
10h 34m
1 stop
SJU8:34 pmSan Juan Luis Munoz Marin Intl
May 19
SJU7:20 amSan Juan Luis Munoz Marin Intl
18h 10m
2 stops
ONT10:30 pmOntario
$309
United Airlines
May 10
ONT7:00 amOntario
10h 34m
1 stop
SJU8:34 pmSan Juan Luis Munoz Marin Intl
May 13
SJU2:55 pmSan Juan Luis Munoz Marin Intl
10h 03m
1 stop
ONT9:58 pmOntario
$334
United Airlines
May 13
ONT7:00 amOntario
10h 34m
1 stop
SJU8:34 pmSan Juan Luis Munoz Marin Intl
May 20
SJU7:40 amSan Juan Luis Munoz Marin Intl
15h 56m
2 stops
ONT8:36 pmOntario
$366

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to San Juan Luis Munoz Marin Intl Airport 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, momondo users made 832,500 searches. Data last updated January 28, 2026.
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

Fly to

Route

Depart

Return

Price

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 3/2

11:58 pm-6:09 pm

2 stops14h 11m

San Juan Luis Munoz Marin Intl

Fri 3/6

7:33 am-11:59 pm

1 stop20h 26m

$284

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 5/16

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Tue 5/19

7:20 am-10:30 pm

2 stops18h 10m

$309

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 2/27

2:21 pm-11:37 am

1 stop17h 16m

San Juan Luis Munoz Marin Intl

Tue 3/3

11:07 am-9:34 pm

2 stops14h 27m

$311

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 2/9

3:36 pm-12:27 pm

1 stop16h 51m

San Juan Luis Munoz Marin Intl

Thu 2/12

7:54 pm-7:26 am

2 stops39h 32m

$319

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 4/7

5:18 pm-11:07 am

1 stop14h 49m

San Juan Luis Munoz Marin Intl

Thu 4/9

6:00 am-6:45 pm

2 stops15h 45m

$331

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 5/10

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Wed 5/13

2:55 pm-9:58 pm

1 stop10h 03m

$334

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 4/25

10:15 pm-11:50 am

1 stop10h 35m

San Juan Luis Munoz Marin Intl

Tue 5/5

2:34 pm-9:00 pm

1 stop9h 26m

$336

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 2/21

6:00 am-12:54 am

2 stops38h 54m

San Juan Luis Munoz Marin Intl

Sat 2/28

7:44 pm-2:29 pm

1 stop22h 45m

$346

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 4/6

7:35 pm-11:07 am

1 stop12h 32m

San Juan Luis Munoz Marin Intl

Mon 4/13

6:07 pm-11:55 pm

2 stops32h 48m

$350

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 5/7

2:08 pm-9:13 am

2 stops16h 05m

San Juan Luis Munoz Marin Intl

Tue 5/12

12:53 pm-8:27 pm

1 stop10h 34m

$362

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Ontario to San Juan Luis Munoz Marin Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ontario and San Juan Luis Munoz Marin Intl Airport?

What is the cheapest month to fly to San Juan Luis Munoz Marin Intl Airport?

If you aren’t able to travel to San Juan Luis Munoz Marin Intl Airport during the month of October, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $477.

How far in advance should I book a flight to San Juan Luis Munoz Marin Intl Airport?

You are more likely to see cheaper flights to San Juan Luis Munoz Marin Intl Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan Luis Munoz Marin Intl Airport for around $576 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan Luis Munoz Marin Intl Airport from Ontario for as low as $460 on momondo.

Can stopping save me money on Ontario to San Juan Luis Munoz Marin Intl Airport flights?

You could potentially save up to 23% on your flight if you consider stops on a Ontario to San Juan Luis Munoz Marin Intl Airport flight.

How have Ontario to San Juan Luis Munoz Marin Intl Airport flight prices changed over time?

As of January 2026, prices for Ontario to San Juan Luis Munoz Marin Intl Airport flights are approximately 1% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to San Juan Luis Munoz Marin Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to San Juan Luis Munoz Marin Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to San Juan Luis Munoz Marin Intl Airport (ONT to SJU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to San Juan Luis Munoz Marin Intl Airport

Fastest flight time

9h 25m

Direct flights

None
The fastest flight from Ontario to San Juan Luis Munoz Marin Intl Airport takes 9h 25m
There are no direct flights from Ontario to San Juan Luis Munoz Marin Intl Airport. There are no popular flight routes from Ontario to San Juan Luis Munoz Marin Intl Airport.
Search flight deals

  • How far is Ontario to San Juan Luis Munoz Marin Intl by plane?

    A flight from Ontario to San Juan Luis Munoz Marin Intl will travel around 3337.2 mi. Typically, this will take 9h 25m by plane in normal conditions.

  • When did momondo last update prices for flights from Ontario Airport to San Juan Luis Munoz Marin Intl Airport?

    Prices for flights from Ontario Airport to San Juan Luis Munoz Marin Intl Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to San Juan Luis Munoz Marin Intl Airport?

  • How old do you have to be to fly from Ontario Airport to San Juan Luis Munoz Marin Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to San Juan Luis Munoz Marin Intl Airport.

  • What documentation or ID do you need to fly to San Juan Luis Munoz Marin Intl Airport?

    The necessary travel and health documents for your San Juan Luis Munoz Marin Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to San Juan Luis Munoz Marin Intl Airport?

Best airlines flying from Ontario to San Juan Luis Munoz Marin Intl Airport

Compare and see reviews for airlines that fly from Ontario to San Juan Luis Munoz Marin Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $73Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
DeltaPriceFrom $292Free CancellationRating
7.9
8,124 reviews
Search Delta flights
United AirlinesPriceFrom $321Free CancellationRating
7.4
9,212 reviews
Search United Airlines flights
American AirlinesPriceFrom $365Free CancellationRating
7.2
11,201 reviews
Search American Airlines flights
SouthwestPriceFrom $480Free CancellationRating
8.0
4,267 reviews
Search Southwest flights

Traveling to a place near San Juan?

Book flights to San Juan if you plan to visit one of these locations
Carolina
Fajardo
Dorado
Luquillo
Caguas
Humacao
Rio Grande
Bayamón

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to San Juan?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to San Juan. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to San Juan with flexible booking policies on momondo?

Yes. All flights to San Juan from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to San Juan?

Once you have performed a search for Ontario to San Juan flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to San Juan right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to San Juan flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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